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Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp

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FY2017 Annual Report · Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp
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20-F/A 1 sbsform20f_2017a.htm FORM 20-F/A  

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 20‑F/A

(Amendment No. 1)

o      REGISTRATION  STATEMENT  PURSUANT  TO  SECTION  12(b)  OR  (g)  OF  THE  SECURITIES  EXCHANGE  ACT  OF

1934

OR

þ   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE

FISCAL YEAR ENDED DECEMBER 31, 2017

o   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

For the transition period from ________________ to _______________________

OR

o    SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of event requiring this shell company report__________________________

Commission file number 001‑31317

Companhia de Saneamento Básico do Estado de São Paulo–SABESP
 (Exact name of Registrant as specified in its charter)

Basic Sanitation Company of the State of São Paulo‑SABESP
 (Translation of the Registrant’s name into English)

Federative Republic of Brazil
(Jurisdiction of incorporation or organization)

Rua Costa Carvalho, 300
 05429‑900 São Paulo, SP, Brazil
 (Address of principal executive offices)

Rui de Britto Álvares Affonso
raffonso@sabesp.com.br
(+55 11 3388 8247)
Rua Costa Carvalho, 300 05429‑900 São Paulo, SP, Brazil

Securities registered or to be registered pursuant to Section 12(b) of the Act:

Title of each class
Common Shares, without par value
American Depositary Shares, evidenced by American Depositary Receipts, each
representing one Common Share

Name of each exchange on which registered
New York Stock Exchange

New York Stock Exchange

Not for trading purposes, but only in connection with the registration of American Depositary Shares pursuant to the requirements of the Securities and Exchange Commission.

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Securities registered or to be registered pursuant to Section 12(g) of the Act:  None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:  None

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by
the annual report.

683,509,869 Shares of Common Stock

Indicate by check mark if the registrant is a well‑known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes þ No o

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or
15(d) of the Securities Exchange Act of 1934.

Yes o No þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been
subject to such filing requirements for the past 90 days.

Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data
File required to be submitted and posted pursuant to Rule 405 of Regulation S‑T (§232.405 of this chapter) during the preceding 12 months (or
for such shorter period that the registrant was required to submit and post such files).

Yes þ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non‑accelerated filer, or an emerging growth
company.  See the definitions of "large accelerated filer," "accelerated filer," and "emerging growth company" in Rule 12b-2 of the Exchange
Act.

Large Accelerated Filer  þ

Non‑accelerated Filer  o

Accelerated Filer  o 

Emerging Growth Company  o 

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant
has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant
to Section 13(a) of the Exchange Act. o

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

U.S. GAAP o International Financial Reporting Standards as issued by the International Accounting Standards Board þ Other o

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has
elected to follow

Item 17 o Item 18 o

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b‑2 of the Exchange Act).

Yes o No þ

†              The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards
Codification after April 5, 2012.

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EXPLANATORY NOTE

                This Amendment No. 1 to the Annual Report on Form 20-F for the fiscal year ended December 31, 2017 of Companhia de Saneamento Básico do
Estado de São Paulo – SABESP, originally filed with the Securities and Exchange Commission on April 27, 2018 (the “2017 Form 20-F”), is being filed for
the purposes of adding Exhibit 101 to Item 19 “Exhibits” and furnishing the Interactive Data File disclosure as Exhibit 101 in accordance with Rule 405 of
Regulation S-T. This Exhibit was not previously filed.

                This Amendment No. 1 to the 2017 Form 20-F also includes the following principal updates:

·         The following changes resulting from our annual shareholders’ meeting held on April 27, 2018:

o    The increase in the number of members on our board of directors from eigtht to ten;        

o    The election of members to our board of directors to serve until our annual shareholders’ meeting in 2020. For the current composition of
our  Board  of  Directors,  see  “Item  6.  Directors,  Senior  Management  and  Employees—A.  Directors  and  Senior  Management—Board  of
Directors”;

o    The election of members to our fiscal council to serve until our annual shareholders’ meeting in 2019. For the current composition of our
fiscal  council,  see  “Item  6.  Directors,  Senior  Management  and  Employees—A.  Directors  and  Senior  Management—Fiscal  Counsil
(Conselho Fiscal)”;

o    The approval of the legal reserve, dividends and investment reserve for the fiscal year ended December 31, 2017. For more information, see
“Item  10.  Additional  Information—B.  Memorandum  and  Articles  of  Association—Reserves”  and  Item  8.A.    Financial  Statements  and
Other Financial Information—Dividends and Dividend Policy”;

o    The approval of R$4.7 million in aggregate compensation payable to members of our board of directors, members of our fiscal committee
and our executive officers in 2018. For more information see “Item 6. Directors, Senior Management and Employees— Directors, Senior
Management and Employees—B. Compensation”;

o    Certain revisions to our bylaws in order to comply with Federal Law No. 13,303/16 and the new Novo Mercado requirements, and other
changes in our governance structure, such as the termination of the Regulatory Affairs Committee. For more information regarding our
bylaws  see,  “Item  10.  Additional  Information—B.  Memorandum  and  Articles  of  Association.”  For  more  information  regarding  the
changes  required  to  be  implemented  by  June  30,  2018  under  Federal  Law  No.  13,303/16  see,  “Item  16G.  Corporate  Governance—
Required Changes to Corporate Governance Practices of Brazilian Government Controlled Companies.” For more information regarding
the changes required to be implemented by April 2021 under the new Novo Mercado requirements see, “Item 9.C. Markets—Trading on
the Brazilian Stock Exchange—The Novo Mercado Segment;” and

o       The formalization of our dividend policy. For more information on our dividend policy, see “Item 8.A.  Financial Statements and Other

Financial Information—Dividends and Dividend Policy”;

·         The election on May 14, 2018 of Karla Bertocco Trindade as our Chief Executive Officer. For more information, see “Item 4. Risk Factors—Risks
Relating to Our Control by the State of São Paulo—We are controlled by the State of São Paulo, whose interests may differ from the interests of non-
controlling shareholders, including holders of ADSs”; and

·         The conclusion of the Second Ordinary Tariff Revision in May 2018 and our subsequent filing of a reconsideration request as well as a clarification
and revision request with ARSESP on May 24, 2018. For more information regarding this tariff revision, see “Item 4.B. Business Overview—Tariffs
—Second Ordinary Tariff Revision (2017-2020)”

                Other than as expressly set forth above, this Amendment No. 1 to the 2017 Form 20-F does not, and does not purport to, amend, update or restate the
information in any other item of the 2017 Form 20-F, or reflect any events that have occurred after the 2017 Form 20-F was originally filed.

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TABLE OF CONTENTS

PART I 

ITEM 1. 
ITEM 2. 
ITEM 3. 
ITEM 4. 
ITEM 5. 
ITEM 6. 
ITEM 7. 
ITEM 8. 
ITEM 9. 
ITEM 10. 
ITEM 11.
ITEM 12. 

IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS 
OFFER STATISTICS AND EXPECTED TIMETABLE 
KEY INFORMATION 
INFORMATION ON THE COMPANY 
OPERATING AND FINANCIAL REVIEW AND PROSPECTS 
DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES 
MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS 
FINANCIAL INFORMATION 
THE OFFER AND LISTING 
ADDITIONAL INFORMATION 
QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK 
DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES 

PART II 

ITEM 13. 
ITEM 14. 

ITEM 15. 
ITEM 16.

DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES 
MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF
PROCEEDS
CONTROLS AND PROCEDURES 
[Reserved]

PART III 

ITEM 17. 
ITEM 18. 
ITEM 19. 

FINANCIAL STATEMENTS 
FINANCIAL STATEMENTS 
EXHIBITS 

PART IV

SIGNATURES

Page 

6
6
6
6
25
79
106
115
124
127
132
144
147

149
149

 149
149
150

157
157
157
158
159
159

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General

PRESENTATION OF FINANCIAL AND OTHER INFORMATION

We maintain our books and records in reais.  We prepare our financial statements in accordance with International Financial Reporting

Standards, or “IFRS”, as issued by the International Accounting Standards Board, or the “IASB”.  Our audited financial statements as of
December 31, 2017 and 2016 and for each of the years in the three year period ended December 31, 2017 and are included in this annual report
on Form 20‑F.

Certain figures included in this annual report have been subject to rounding adjustments.  Accordingly, figures shown as totals in certain

tables may not be an arithmetic aggregation of the figures which precede them.

Water Crisis

Our results and operational performance for the fiscal year ended December 31, 2017 were partially affected by the lowest stream flow
measurements in over 80 years due to the serious drought in 2014 and 2015. With the return of the rainfall to its historical average for the rainy
season that began in October 2015 and ended in March 2016, the level of water in the reservoirs that provide water to the population of the São
Paulo metropolitan region returned to normal and the measures taken during the water crisis to continue to service consumers were gradually
discontinued.  However, heightened public awareness of the need to conserve water during the crisis resulted in our customers adopting lower
water consumption practices during the water crisis and these practices have been partially integrated into our consumers’ daily habits. Another
probable  factor  for  why  consumptions  levels  have  not  yet  returned  to  their  pre-water  crisis  levels  despite  the  return  of  the  rainfall  to  its
historical average is the contraction of the Brazilian economy, which may have resulted in lower consumption of water by industry and other
businesses.  As a result, despite our reservoirs having a higher volume of water available for treatment, the total volume of water billed to our
clients did not return to the volume of water billed in 2013, before the water crisis.  As of December 31, 2017, the reservoirs in the São Paulo
metropolitan region, where our largest market is located, contained 916.8 million m3 of water storage for treatment, compared to 951.1 million
m3  available  for  treatment  as  of  December  31,  2016.  The  measurements  for  these  years  do  not  include  the  so  called  “technical  reserve”  of
287.5  million  m³.  See  “Item  4.B.  Business  Overview—The  Recent  Water  Crisis”.   Average  monthly  water  production  in  2017  for  the  São
Paulo metropolitan region was 60.6 m³/s, compared to 58.5 m³/s in 2016, 52.0 m³/s in 2015, 62.2 m³/s in 2014 and 69.1 m³/s in 2013, the year
before the water crisis started.  For more information, see “Item 3.D. Risk Factors—Risks Relating to Our Business—“The measures we took
to  mitigate  the  effects  of  the  drought  that  occurred  in  2014  and  2015  resulted  in  a  significant  decrease  in  the  volume  of  water  billed  and
revenues  from  services  we  provide  and,  despite  the  discontinuation  in  May  2016  of  the  measures  that  were  used  to  face  the  drought,  new
consumption habits were incorporated and the volume of water billed continues to be impacted by those measures.” and “Item 4.B. Business
Overview—The Recent Water Crisis”.

Convenience Translations

We have translated some of the real amounts contained in this annual report into U.S. dollars.  The rate used to translate such amounts in
respect of the year ended December 31, 2017 was R$3.3080 to US$1.00, which was the commercial rate for the purchase of U.S. dollars in
effect  on  December  31,  2017,  as  reported  by  the  Central  Bank.    The  U.S.  dollar  equivalent  information  presented  in  this  annual  report  is
provided solely for the convenience of the reader and should not be construed as implying that the real amounts represent, or could have been
or  could  be  converted  into,  U.S.  dollars  at  the  above  rate.    See  “Item  3.A.  Selected  Financial  Data—Exchange  Rates”  for  more  detailed
information regarding the Brazilian foreign exchange system and historical data on the exchange rate of the real against the U.S. dollar.

Rounding

Some percentages and numbers included in this annual report have been subject to rounding adjustments.  Accordingly, figures shown as

totals in certain tables may not be an arithmetic aggregation of the figures that precede them.

Other Information

In  this  annual  report,  unless  the  context  otherwise  requires,  references  to  “we,”  “us,”  “our,”  “Company,”  or  “SABESP”  refer  to

Companhia de Saneamento Básico do Estado de São Paulo – SABESP.

In addition, references to:

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·        “ARSESP” are to the São Paulo State Sanitation and Energy Regulatory Agency (Agência Reguladora de Saneamento e Energia do

Estado de São Paulo);

·        “ADR” or “ADRs” are to American Depositary Receipt or American Depositary Receipts, respectively;

·        “ADS” or “ADSs” are to American Depositary Share or American Depositary Shares, respectively;

·        “Brazil” are to the Federative Republic of Brazil;

·        “Central Bank” are to the Central Bank of Brazil;

·        “Coverage” indicators are to (a) the number of homes that are actually connected to the water network or sewage collection network,
plus the number of homes for which the water and sewage networks are available for connection but which are not connected to those
networks  (referred  to  as  “feasible”  or  “connectable”  homes),  as  a  portion  of  (b)  the  total  number  of  homes  within  the  urbanized
service area covered by our contract with the municipality (i.e., the “serviceable area”);

·        “CVM” are to the Comissão de Valores Mobiliários, the Brazilian regulator of securities;

·                “federal  government”  and  “Brazilian  government”  are  to  the  federal  government  of  the  Federative  Republic  of  Brazil  and  “state

government” are to the state government of the State of São Paulo;

·        “real,” “reais” or “R$” are to the Brazilian real, the official currency of Brazil;

·                “Regional  Systems”  are  to  the  area  where  the  regional  systems’  executive  office  operates,  comprising  330  municipalities  in  the

interior and coastline regions of the state of São Paulo;

·               “São Paulo metropolitan region,” with respect to our operations, are to the area where the metropolitan executive office operates,

comprising 38 municipalities, including the city of São Paulo;

·        “Service” indicators are to (a) the number of homes that are actually connected to the water network or sewage collection network, as

a portion of (b) the total number of homes within a given serviceable area;

·        “Sewage Treatment Coverage” indicators are to the amount of consumer units connected to the sewage treatment system;

·        “State” are to the State of São Paulo, which is also our controlling shareholder;

·        “U.S. dollars” or “US$” are to the United States dollar, the official currency of the United States;

·        “water crisis” are to the drought we have experienced from late 2013 and throughout most of 2015.  This drought, the most serious
that our service region has experienced in more than 80 years, primarily affected the Cantareira System, our largest water production
system.

Information  in  this  annual  report  related  to  liters,  water  and  sewage  volumes,  number  of  employees,  kilometers,  water  and  sewage
connections,  population  served,  operating  productivity,  water  production,  water  and  sewage  lines  (in  kilometers),  water  loss  index  and
investment in programs has not been audited.

Market Information

We make statements in this annual report about our market share and other information relating to Brazil and the industry in which we
operate.    We  have  made  these  statements  on  the  basis  of  information  from  third-party  sources  and  publicly  available  information  that  we
believe is reliable, such as information and reports from the Brazilian Institute of Geography and Statistics (Instituto Brasileiro de Geografia e
Estatística), or IBGE, and the State Data Analysis System Foundation (Fundação Sistema Estadual de Análise de Dados), or SEADE, among
others.  We have no reason to believe that any of this information is inaccurate in any material respect.

References to urban and total population in this annual report are estimated based on research prepared by SEADE entitled “Projections of
Population and Residences for the Municipalities of the State of São Paulo: 2010-2050” (Projeção da População e dos Domicílios para os
Municípios do Estado de São Paulo: 2010-2050).

2

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Our Contracts and the Municipalities We Serve

Throughout this document, we refer to the 368 municipalities we serve and to our 370 contracts.  This difference results from the fact that
we have two partial water contracts with the municipality of Mogi das Cruzes.  However, as the majority of the municipality is serviced on a
wholesale  basis,  Mogi  das  Cruzes  has  not  been  included  in  the  total  number  of  municipalities  we  serve.    Most  of  our  contracts  with  the
municipalities we serve are program contracts which have a term of 30 years

3

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CAUTIONARY STATEMENTS ABOUT FORWARD‑LOOKING STATEMENTS

This annual report includes forward‑looking statements, mainly in Items 3 through 5.  We have based these forward‑looking statements
largely  on  our  current  expectations  and  projections  about  future  events  and  financial  trends  affecting  our  business.    These  forward‑looking
statements are subject to risks, uncertainties and assumptions, including, among other factors:

·        general economic, political, demographical and other conditions in Brazil and in other emerging market countries;

·                changes  in  applicable  laws  and  regulations,  as  well  as  the  enactment  of  new  laws  and  regulations,  including  those  relating  to

environmental, tax and employment matters in Brazil;

·        availability of the water supply;

·        the impact on our business of lower water consumption practices adopted by our customers during the water crisis, which may remain

in place despite the discontinuation of the measures adopted to serve the São Paulo metropolitan region during the water crisis;

·        any measures that we may be required to take to ensure the provision of water to our customers;

·        our exposure to probable increases in the frequency of extreme weather conditions, including droughts and intensive rain and other

climatic events;

·        fluctuations in inflation, interest rates and exchange rates in Brazil;

·        the interests of our controlling shareholder;

·        our potential corporate reorganization, as approved by State Law No. 16,525 on September 15, 2017;

·        our ability to collect amounts owed to us by our controlling shareholder and by municipalities;

·        our ability to continue to use certain reservoirs under current terms and conditions;

·        our capital expenditure program and other liquidity and capital resources requirements;

·        power shortages, rationing of energy supply or significant changes in energy tariffs;

·        the effects of the agreement for provision of water and sewage services in the city of São Paulo, which we executed with the State and

the city of São Paulo;

·               the  lack  of  formal  agreements  between  our  company  and  certain  municipalities  to  which  we  provide  water  and  sewage  services,
including  cities  comprising  metropolitan  regions,  urban  conurbations,  and  the  fact  that  the  State  and  municipal  governments  share
competency regarding these services;

·        the municipalities’ ability to terminate our existing concession agreements prior to their expiration date and our ability to renew such

agreements;

·               our ability to provide water and sewage services in additional municipalities and to maintain the right to provide the services for

which we currently have contracts;

·        the size and growth of our customer base and its consumption habits;

·                our  ability  to  comply  with  the  requirements  regarding  water  and  sewage  service  levels  included  in  our  agreements  with

municipalities;

·        our level of debt and limitations on our ability to incur additional debt;

·        our ability to access financing with favorable terms in the future;

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·        the costs we incur in complying with environmental laws and any penalties for failure to comply with these laws;

·        the outcome of our pending or future legal proceedings;

·        the delay or postponement in investment in our sewage system;

·        our management’s expectations and estimates relating to our future financial performance;

·        the regulations issued by ARSESP regarding several aspects of our business, including limitations on our ability to set and adjust our

tariffs;

·        the possibility to be subject to a regulatory agency, other than ARSESP; and

·        other risk factors as set forth under “Item 3.D. Risk Factors”.

The words “believe,” “may,” “estimate,” “continue,” “anticipate,” “plan,” “intend,” “expect” and similar words are intended to identify
forward‑looking statements.  In light of these risks and uncertainties, the forward‑looking events and circumstances discussed in this annual
report  might  not  occur.    Our  actual  results  could  differ  substantially  from  those  anticipated  in  our  forward‑looking  statements. 
Forward‑looking  statements  speak  only  as  of  the  date  they  were  made  and  we  do  not  undertake  any  obligation  to  update  or  revise  any
forward‑looking  statements,  whether  as  a  result  of  new  information,  future  events  or  otherwise,  unless  required  by  law.    Any  such
forward‑looking statements are not an indication of future performance and involve risks.

5

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 ITEM 1.            IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS

Not applicable.

 ITEM 2.            OFFER STATISTICS AND EXPECTED TIMETABLE

PART I  

Not applicable.

 ITEM 3.            KEY INFORMATION

A.         Selected Financial Data

The  following  selected  financial  data  should  be  read  in  conjunction  with  our  audited  financial  statements  (including  the  notes  thereto),

“Presentation of Financial and Other Information” and “Item 5.  Operating and Financial Review and Prospects”.

The selected financial data as of December 31, 2017 and 2016 and for the years ended December 31, 2017, 2016 and 2015 have been
derived from our audited financial statements, presented in accordance with IFRS, and included in this annual report.  The selected financial
data  as  of  December  31,  2015,  2014  and  2013  and  for  the  years  ended  December  31,  2014  and  2013  have  been  derived  from  our  audited
financial statements, presented in accordance with IFRS, which is not included in this annual report. 

We  have  included  information  with  respect  to  the  dividends  and/or  interest  attributable  to  shareholders’  equity  paid  to  holders  of  our
common shares since January 1, 2013 in reais and in U.S. dollars translated from reais at the commercial market selling rate in effect as of the
payment date under the caption “Item 8.A.  Financial Statements and Other Financial Information—Dividends and Dividend Policy—Payment
of Dividends”.

For the year ended December 31,

(1)

2017
US$

2017

R$

2016

R$

2015

R$

2014

R$

2013

R$

(in millions, except per share and per ADS 

data

(2) 

Selected Income Statement Data:
Net operating revenue
Cost of services
Gross profit
Selling expenses
Administrative income (expenses)
Operating profit
Financial income (expenses), net
Profit for the year
Earnings per share – basic and diluted (3)

Earnings per ADS – basic and diluted (3)
Dividends and interest on shareholders’ equity per

share(3)

Dividends and interest on shareholders’ equity per

ADS(3)

Weighted average number of common shares

outstanding(3)

4,416.0
(2,653.9)
1,762.2
(232.4)
(332.2)
1,197.6
(138.5)
761.6

1.11

1.11

0.06

0.06

14,608.2
(8,779.0)
5,829.2
(768.7)
(1,099.0)
3,961.7
(458.1)
2,519.3

3.69

3.69

0.19

0.19

14,098.2
(9,013.1)
5,085.1
(730.0)
(934.9)
3,429.6
699.4
2,947.1

4.31

4.31

1.02

1.02

11,711.6
(8,260.8)
3,450.8
(598.1)
45.0
3,044.0
(2,456.5)
536.3

0.78

0.78

0.19

0.19

11,213.2
(7,635.6)
3,577.6
(736.6)
(924.4)
1,910.7
(635.9)
903.0

1.32

1.32

0.32

0.32

11,315.6
(6,816.3)
4,499.3
(637.1)
(729.1)
3,138.8
(483.2)
1,923.6

2.81

2.81

0.67

0.67

683,509,869

683,509,869

683,509,869

683,509,869

683,509,869

683,509,869

(1)       Translated at the commercial selling rate at closing for the purchase of U.S. dollars, as reported by the Central Bank, as of December 31, 2017 of R$3.3080 to US$1.00.
(2)       ADS-American Depositary Share.
(3)       On  April  22,  2013,  our  shareholders  approved  a  stock  split,  following  which  each  common  share  represented  three  new  common  shares.    Therefore,  per  share  information  in  the

selected financial data has been retrospectively restated to give effect to the stock split to all periods presented.

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 Selected Statement of Financial Position Data

As of December 31,

(1)

2017

US$

2017

R$

2016

R$

2015

R$

(in millions, except per share and per ADS 

Property, plant and equipment
Intangible assets
Total assets
Current portion of long‑term loans and financing
Long‑term loans and financing
Interest on capital
Total liabilities
Equity
Capital stock

Selected Statements of Cash Flows Data:
Net cash generated from operating activities
Net cash used in investing activities
Net cash provided by (used in) financing activities
Purchases of intangible assets and property, plant and

equipment as presented in our statement of cash flow

77.1
10,116.7
11,954.8

528.0

3,130.1
181.0
6,660.7
5,294.1
3,023.0

998.2
(596.0)
(282.2)

(597.6)

255.1
33,466.1
39,546.4

1,746.8

10,354.2
598.6
22,033.4
17,513.0
10,000.0

3,301.9
(1,971.4)
(933.6)

(1,976.7)

302.4
31,246.8
36,745.0

1,246.6

10,717.6
700.0
21,325.8
15,419.2
10,000.0

3,003.6
(2,130.7)
(625.9)

(2,135.8)

325.1
28,513.6
33,706.6

1,526.3

11,595.3
127.4
19,990.0
13,716.6
10,000.0

2,641.4
(2,459.5)
(265.7)

(2,452.1)

2014

R$
(2) 

data
304.8
25,979.5
30,355.4

1,207.1

9,578.6
214.5
17,051.0
13,304.4
10,000.0

2,480.3
(2,757.7)
218.5

(2,748.3)

2013

R$

199.5
23,846.2
28,274.3

640.9

8,809.1
457.0
15,343.5
12,930.8
6,203.7

2,777.2
(2,281.5)
(629.7)

(2,335.8)

(1)      Translated at the commercial selling rate at closing for the purchase of U.S. dollars, as reported by the Central Bank, as of December 31, 2017 of R$3.3080 to US$1.00.
(2)      ADS-American Depositary Share.

Operating Data

Indicator

Number of water connections (in thousands)
Number of sewage connections (in thousands)
Percentage of population with water connections (“service”

indicator) (in percent) (1)

Percentage of population with sewer connections (“service”

indicator) (in percent) (1)

Percentage of population covered by water network (“coverage”

indicator) (in percent) (2)

Percentage of population covered by sewage network (“coverage”

indicator) (in percent) (2)

Percentage of consumer units connected to the sewage treatment
system (“sewage treatment coverage” indicator) (in percent)
Volume of water billed during period (in millions of cubic meters)
Water Billed Loss Index during period (average) (in percent)(3)
Water Metered Loss Index during period (average) (in percent)(4)
Water loss per connection per day (average)(5)
Number of employees (6)

As of and for the year ended December 31,

2017
8,863
7,302

95

83

98

90

75
2,075.9
20.1
30.7
302
13,672

2016
8,654
7,091

95

82

98

89

74
1,990
20.8
31.8
308
14,137

2015
8,420
6,861

96

83

99

90

72
1,914
16.4
28.5
258
14,223

(1)      Is equal to (a) the number of homes that are actually connected to the water network or sewage collection network, as a portion of (b) the total number of homes within the serviceable area.
(2)      It is equal to (a) the number of homes that are actually connected to the water network or sewage collection network, plus the number of homes for which the water and sewage networks are
available for connection but which are not connected to those networks (referred to as “feasible” or “connectable” homes), as a portion of (b) the total number of homes within the urbanized
service area covered by our contract with the municipality (i.e., the “serviceable area”).

(3)      Includes both physical and non‑physical water loss.  Water Billed Loss Index represents the quotient of (i) the difference between (a) the total volume of water produced plus (b) the total
volume of water invoiced minus (c) the volume of water excluded from our calculation of water loss, divided by (ii) the total volume of water produced.  For more information, see “Item 4.B.
Business  Overview—Description  of  Our  Activities—Water  Operations—Water  Loss”.    We  exclude  the  following  from  our  calculation  of  water  loss:    (i)  water  discharged  for  periodic
maintenance of water  transmission lines and water storage tanks; (ii) water supplied for municipal uses such as firefighting; (iii) water we consume in our facilities; and (iv) estimated water
loss related to the supply of water to shantytowns (favelas).  

(4)      Includes both physical and non‑physical water loss.  The Water Metered Loss Index represents the quotient of (i) the difference between (a) the total volume of water produced minus (b) the
total volume of water measured minus (c) the volume of water that we exclude from our calculation of water loss, divided by (ii) the total volume of water produced.  For more information,
see “Item 4.B. Business Overview—Description of Our Activities—Water Operations—Water Loss”.  We exclude the following from our calculation of water loss:  (i) water discharged for
periodic maintenance of water  transmission lines and water storage tanks; (ii) water supplied for municipal uses such as firefighting; (iii) water we consume in our facilities; and (iv) estimated
water loss related to the supply of water to shantytowns (favelas).

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(5)      Measured in liters/connection per day, this amount is calculated by dividing (i) the average annual water loss by (ii) the average number of active water connections multiplied by the number
of days of the year.  This calculation method is based on worldwide market practice within the sector.  See “Item 4.B. Business Overview—Description of Our Activities—Water Operations—
Water  Loss”.   We  exclude  the  following  from  our  calculation  of  water  loss:    (i)  water  discharged  for  periodic  maintenance  of  water  transmission  lines  and  water  storage  tanks;  (ii)  water
supplied for municipal uses such as firefighting; (iii) water we consume in our facilities; and (iv) estimated water loss related to the supply of water to shantytowns (favelas).

(6)      In 2015, this figure included 370 employees who retired due to disability. This number was excluded from the 2016 and 2017 figures.

Exchange Rates

In  the  past,  the  Brazilian  National  Monetary  Council  (Conselho  Monetário  Nacional),  or  the  “CMN”,  has  introduced  changes  to  the
Brazilian  foreign  exchange  regime,  such  as  unifying  the  Commercial  and  Floating  Markets  and  easing  the  rules  governing  the  ability  of
Brazilian  residents  to  acquire  foreign  currency,  among  others.    On  March  24,  2010,  the  CMN  and  the  Central  Bank  approved  Resolution
No. 3,844/2010, as amended, which led to a series of measures to consolidate and simplify Brazilian foreign exchange market regulations.

The  Brazilian  foreign  exchange  system  allows  any  person  or  legal  entity  to  purchase  or  sell  foreign  currency  and  make  international

transfers of reais, regardless of the amount, subject to certain regulatory procedures.

The Brazilian currency has experienced frequent and substantial variations in relation to the U.S. dollar and other foreign currencies in
recent  decades.    Between  2003  and  mid‑2008,  the  real  appreciated  significantly  against  the  U.S.  dollar  with  the  exchange  rate  reaching
R$1.634  in  August  2008,  although  it  depreciated  by  32.0%  against  the  U.S.  dollar  during  full  year  2008,  closing  the  year  at  R$2.337  per
US$1.00.  The real strengthened again by 25.5% in 2009 and 4.3% in 2010, but depreciated against the U.S. dollar by 12.6% in 2011, 8.94% in
2012, 14.63% in 2013, 13.39% in 2014 and 47.01% in 2015, falling to R$3.9048 against the U.S. dollar at December 31, 2015.  The real fell
further during the first months of 2016, reaching a low of R$4.1558 against the U.S. dollar on January 21, 2016, but then regained some value,
reaching R$3.2591 per US$1.00 at December 31, 2016. During 2017, the real remained relatively stable, depreciating only 1.5% against the
U.S. dollar by year-end.

Since  1999,  following  Brazil’s  implementation  of  a  floating  rate  regime,  the  Central  Bank  has  not  directly  intervened  in  the  exchange
market.  However, the Central Bank, using financial instruments at its disposal, may buy and sell foreign currency in the market in order to
influence  the  exchange  rate  and  decrease  volatility  with  respect  to  the  Brazilian  real, and  did  so  at  various  points  during  2017.  We  cannot
predict whether the Central Bank or the Brazilian government will continue to let the real float freely or will intervene in the exchange rate
through  a  currency  band  system  or  other  procedure.    The  real may  fluctuate  against  the  U.S.  dollar  substantially  in  the  future.    For  further
information  on  this  risk,  see  “Item  3.D.  Risk  Factors—Risks  Relating  to  Brazil—  The  devaluation  of  the  real  to  foreign  currencies  may
adversely affect us and the market price of our common shares or ADSs”.

Exchange rate fluctuations will affect the U.S. dollar equivalent of the real price of our common shares on the São Paulo Stock Exchange
(B3 S.A. – Brasil, Bolsa, Balcão, or B3, formerly BM&FBOVESPA S.A. ‑ Bolsa de Valores, Mercadorias e Futuros, or BM&FBOVESPA), as
well as the U.S. dollar equivalent of any distributions we make in reais with respect to our common shares.

The following tables set forth the selling rate, expressed in reais per U.S. dollar (R$/US$), for the periods indicated:

Year ended December 31,
2013
2014
2015
2016
2017

Month ended
October 31, 2017
November 30, 2017
December 31, 2017
January 31, 2018
February 28, 2018
March 31, 2018
April 30, 2018
May 31, 2018 (through May 24)

Source:  Central Bank

(1)     Average of the exchange rates on the last day of each month.

Year end
2.3426
2.6562
3.9048
3.2591
3.3080

Period end
3.2769
3.2616
3.3080
3.1624
3.2449
3.3238
3.4811
3.6436

8

R$ per US$1.00
(1)

Average
2.1605
2.3547
3.3387
3.4833
3.2031

Low
2.4457
2.7403
4.1949
4.1558
3.0510

R$ per US$1.00

Average
3.1912
3.2594
3.2919
3.2106
3.2415
3.2792
3.4075
3.6190

Low
3.1315
3.2136
3.2322
3.1391
3.1730
3.2246
3.3104
3.5308

High
1.9528
2.1974
2.5754
3.1193
3.3807

High
3.2801
3.2920
3.3332
3.2697
3.2821
3.3380
3.5040
3.7503

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The following tables set forth the selling rate, expressed in reais per Japanese Yen (R$/¥1.00): 

Year end
0.0223
0.0222
0.0324
0.0279
0.0294

Period end
0.0291
0.0289
0.0294
0.0290
0.0304
0.0313
0.0319
0.0333

R$ per ¥1.00
(1)

Average
0.0221
0.0222
0.0276
0.0289
0.0291

Low
0.0248
0.0239
0.0351
0.0305
0.0287

R$ per ¥1.00

Average
0.0289
0.0289
0.0291
0.0290
0.0300
0.0309
0.0317
0.0329

Low
0.0286
0.0286
0.0287
0.0286
0.0290
0.0304
0.0309
0.0322

High
0.0196
0.0212
0.0219
0.0278
0.0296

High
0.0292
0.0289
0.0296
0.0293
0.0305
0.0315
0.0321
0.0339

Year ended December 31,

2013
2014
2015
2016
2017

Month ended
October 31, 2017
November 30, 2017
December 31, 2017
January 31, 2018
February 28, 2018
March 31, 2018
April 30, 2018  
May 31, 2018 (through May 24)

Source:  Central Bank

(1)     Average of the exchange rates on the last day of each period.

B.      Capitalization and Indebtedness

Not applicable.

C.      Reasons for the Offer and Use of Proceeds

Not applicable.

D.      Risk Factors

Risks Relating to Brazil

The Brazilian government has exercised, and continues to exercise, significant influence over the Brazilian economy.  This influence, as
well as Brazilian political and economic conditions, could adversely affect us and the market price of our common shares and ADSs.

The  Brazilian  government  frequently  intervenes  in  the  Brazilian  economy  and  occasionally  makes  significant  changes  in  policy  and
regulations.    The  Brazilian  government’s  actions  to  control  inflation  and  other  policies  and  regulations  have  often  involved,  among  other
measures, changes in interest rates, tax policies, price and tariff controls, currency devaluation or appreciation, capital controls and limits on
imports.    Our  business,  financial  condition  and  results  of  operations,  as  well  as  the  market  price  of  our  common  shares  or  ADSs,  may  be
adversely affected by changes in public policy at federal, state and municipal levels with respect to public tariffs and exchange controls, as well
as other factors, such as:

·        the regulatory environment related to our business operations and concession agreements;

·        interest rates;

·        exchange rates and exchange controls and restrictions on remittances abroad;

·        currency fluctuations;

·        inflation;

·        liquidity of the Brazilian capital and lending markets;

·        tax and regulatory policies and laws;

·        economic and social instability; and

·        other political, diplomatic, social and economic developments in or affecting Brazil.

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For example, the Brazilian government may change its tax policy, such as by changing tax rates or imposing temporary taxes.  If overall
taxes are increased, we may be unable to immediately recover the difference from our consumers, which may have an adverse effect on our
financial condition and results of operations.

Uncertainty over whether the Brazilian government will change policies or regulations affecting these or other factors may contribute to
economic uncertainty in Brazil and to heightened volatility in Brazilian securities markets and securities issued abroad by Brazilian issuers.
 Brazil was downgraded below investment grade by Standard & Poor’s Global Ratings, or S&P, on September 9, 2015, and received a further
downgrade by the same rating agency on February 17, 2016.  In addition, Brazil was downgraded below investment grade by Fitch Ratings
Inc., or Fitch, on December 16, 2015 and received a further downgrade by the same agency on May 5, 2016.  Moody’s Investors Service, Inc.,
or  Moody’s,  also  downgraded  Brazil  below  investment  grade  on  February  24,  2016.    During  the  first  months  of  2018,  Brazil  received
additional downgrades by S&P on January 11, 2018 and Fitch on February 23, 2018. Following the impeachment of former President Dilma
Rousseff, the Vice-President Michel Temer formally took office on August 31, 2016, announcing a series of economic reforms.  We cannot
assure  you  that  the  Brazilian  government  will  continue  with  its  current  economic  policies,  or  that  these  and  other  developments  in  Brazil’s
economy and government policies will not, directly or indirectly, adversely affect our business and results of operations.

Political conditions may have an adverse impact on the Brazilian economy and on our business.

Brazil’s political environment has historically influenced, and continues to influence, the performance of the country’s economy. Political
crises  have  affected  and  continue  to  affect  the  confidence  of  investors  and  the  general  public,  which  have  historically  resulted  in  economic
deceleration and heightened volatility in the securities issued by Brazilian companies.

The  recent  economic  instability  in  Brazil  has  contributed  to  a  decline  in  market  confidence  in  the  Brazilian  economy  as  well  as  to  a
deteriorating political environment. Various ongoing investigations into allegations of money laundering and corruption being conducted by
the  Office  of  the  Brazilian  Federal  Prosecutor,  including  the  largest  such  investigation,  known  as  “Operação  Lava  Jato”,  have  negatively
impacted the Brazilian economy and political environment. Members of the Brazilian federal government and of the legislative branch as well
as  senior  officers  of  large  state-owned  and  private  companies  have  faced  or  are  currently  facing  allegations  of  corruption  and  money
laundering as a result of these investigations. These individuals are alleged to have accepted bribes by means of kickbacks on contracts granted
by the government to several infrastructure, oil and gas and construction companies. Certain of these companies have faced or are currently
facing  investigations  by  the  Brazilian  Securities  Commission  (Comissão  de  Valores  Mobiliários),  or  CVM,  and  the  U.S.  Securities  and
Exchange Commission, or the SEC. The profits of these kickbacks allegedly financed the political campaigns of political parties forming the
government’s  coalition,  which  funds  were  unaccounted  for  or  not  publicly  disclosed.  These  funds  were  also  allegedly  destined  toward  the
personal enrichment of certain individuals. A number of senior politicians, including members of Congress, former President Luiz Inácio Lula
da Silva, and high-ranking executives officers of major state-owned and private companies in Brazil have been arrested, convicted of various
charges  relating  to  corruption,  entered  into  plea  agreements  with  federal  prosecutors  and/or  have  resigned  or  been  removed  from  their
positions. The potential outcome of Operação Lava Jato as well as other ongoing corruption-related investigations is uncertain, but they have
already hurt the image and reputation of those companies that have been implicated as well as the general market perception of the Brazilian
economy, political environment and the Brazilian capital markets. We have no control over, and cannot predict, whether such investigations or
allegations  will  lead  to  further  political  and  economic  instability  or  whether  new  allegations  against  government  officials  will  arise  in  the
future.

President Dilma Rousseff was suspended from office on May 12, 2016, when the Brazilian Senate voted to hold a trial on impeachment
charges against her. President Rousseff was replaced by Vice-President Michel Temer, who served as acting President until Ms. Rousseff was
permanently removed from office by the Senate on August 31, 2016 for infringing budgetary laws. Michel Temer then became President for
the remainder of the presidential term, which is due to end in December 2018. In June 2017, the Brazilian Higher Electoral Court (Tribunal
Superior Eleitoral,  or  TSE)  cleared  the  electoral  alliance  formed  by  Ms.  Rousseff  and  Mr.  Temer  of  charges  that  it  had  violated  campaign
finance laws in the 2014 election. President Temer remains the subject of investigations by the Brazilian Federal Police and the Office of the
Brazilian Federal Prosecutor relating to allegations of corruption, however, and may ultimately be subject to impeachment proceedings before
his presidential term ends. We cannot predict how the ongoing investigations and proceedings will affect us or the market price of our common
shares or ADSs. Furthermore, uncertainty over whether the acting Brazilian government will implement changes in policy or regulation in the
future may contribute to economic uncertainty in Brazil and to heightened volatility in the securities issued abroad by Brazilian companies.

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Presidential elections are to be held in Brazil in October 2018. We cannot predict the outcome of those elections, including whether any
successor to the current President of Brazil will adopt policies or changes to current policies, which may have a material adverse effect on us.
Furthermore, the political uncertainty resulting from the presidential elections may have an adverse effect on our business, results of operations
and financial condition.

In  addition,  political  demonstrations  in  Brazil  over  the  last  few  years  have  affected  the  development  of  the  Brazilian  economy  and
investors’  perceptions  of  Brazil.  For  example,  street  protests,  which  started  in  mid-2013  and  continued  through  2016,  demonstrated  the
public’s dissatisfaction with the worsening Brazilian economic condition (including an increase in inflation and fuel prices as well as rising
unemployment), the perception of widespread corruption.

Any  of  the  above  factors  may  create  additional  political  uncertainty,  which  could  harm  the  Brazilian  economy  and,  consequently,  our

business, financial condition, results of operations and the price of our ADSs.

Inflation  and  the  Brazilian  government’s  measures  to  combat  inflation  may  contribute  to  economic  uncertainty  in  Brazil,  adversely
affecting us and the market price of our common shares or ADSs. 

Inflation and the Brazilian government’s measures to combat it have had and may in the future have significant effects on the Brazilian
economy and our business.  Tight monetary policies with high interest rates may restrict Brazil’s growth, the availability of credit and our cost
of funding.  Conversely, other Brazilian governmental actions, including lowering interest rates, intervention in the foreign exchange market
and  actions  to  adjust  or  fix  the  value  of  the  real,  may  trigger  increases  in  inflation.    The  Special  Clearing  and  Settlement  System  (Sistema
Especial de Liquidação e Custódia), or SELIC, the official overnight interest rate in Brazil, equaled 6.90%, 13.65%, and 14.15% at the end of
2017,  2016  and  2015,  respectively,  in  line  with  the  target  rate  set  by  the  Brazilian  Committee  on  Monetary  Policy  (Comitê  de  Política
Monetária). 

The  Brazilian  annual  inflation  rates,  as  measured  by  the  Amplified  Consumer  Price  Index  (Índice  Nacional  de  Preços  ao  Consumidor
Amplo), or IPCA, were 2.95%, 6.29%, and 10.67% during 2017, 2016 and 2015, respectively.  If Brazil experiences increases in inflation, our
costs  and  expenses  may  rise,  we  may  be  unable  to  increase  our  tariffs  at  the  same  rate  to  counter  the  effects  of  inflation,  and  our  overall
financial performance may be adversely affected.  In addition, a substantial increase in inflation may weaken investors’ confidence in Brazil,
causing a decrease in the market price of our common shares or ADSs. 

The devaluation of the real to foreign currencies may adversely affect us and the market price of our common shares or ADSs.

The Brazilian currency experienced frequent and substantial devaluations in relation to the U.S. dollar and other foreign currencies during the decades
leading up to the mid-1990s.  Throughout this period, the Brazilian government implemented various economic plans and exchange rate policies, including
sudden devaluations, periodic mini‑devaluations (during which the frequency of adjustments ranged from daily to monthly), floating exchange rate systems,
exchange controls and dual exchange rate markets.  From time to time since that period, there have continued to be significant fluctuations in the exchange rate
between the Brazilian real and the U.S. dollar and other currencies.  For example, the real appreciated 13.8%, 9.5% and 20.7% against the U.S. dollar in 2005,
2006 and 2007, respectively, reaching R$1.634 in August 2008, although it depreciated by 32.0% against the U.S. dollar during full year 2008, closing the year
at R$2.337 per US$1.00.  The real strengthened again by 25.5% in 2009 and 4.3% in 2010, but depreciated against the U.S. dollar by 12.6% in 2011, 8.94% in
2012, 14.63% in 2013, 13.39% in 2014 and 47.01% in 2015, falling to R$3.9048 against the U.S. dollar at December 31, 2015.  The real fell further during the
first months of 2016, reaching a low of R$4.1558 against the U.S. dollar on January 21 2016, but then regained some value, reaching R$3.2591 per US$1.00 at
December 31, 2016. During 2017, the real remained relatively stable, depreciating only 1.5% against the U.S. dollar by year-end. There can be no assurance
that the real will not depreciate further against the U.S. dollar.  As of May 24, 2018, the commercial selling rate as reported by the Central Bank was R$3.6436
per US$1.00.

Depreciation of the real against the U.S. dollar could create inflationary pressures in Brazil and cause increases in interest rates, which
could negatively affect the growth of the Brazilian economy as a whole and harm our financial condition and results of operations, curtail our
access  to  financial  markets  and  prompt  government  intervention,  including  recessionary  governmental  policies.    Depreciation  of  the  real
against the U.S. dollar could also lead to decreased consumer spending, deflationary pressures and reduced economic growth.

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In  the  event  of  a  significant  devaluation  of  the  real  in  relation  to  the  U.S.  dollar  or  other  currencies,  our  ability  to  meet  our  foreign
currency denominated obligations could be adversely affected because our tariff revenue and other sources of income are denominated solely
in  reais.    In  addition,  because  we  have  debt  denominated  in  foreign  currencies,  any  significant  devaluation  of  the  real  will  increase  our
financial expenses as a result of foreign exchange losses that we must record.  We had total foreign currency denominated debt of R$5,672.8
million as of December 31, 2017 and we anticipate that we may incur additional amounts of foreign currency denominated debt in the future. 
In 2017, our results of operations were negatively affected by the 1.50% depreciation of the real against the U.S. dollar, and the depreciation of
the real against the yen by 5.38%, which together led to a R$96.3 million  negative  impact  on  our  foreign  exchange  result,  net.    We  do  not
currently  have  any  derivative  instruments  in  place  to  protect  us  against  a  devaluation  of  the  real  in  relation  to  any  foreign  currency.  A
devaluation of the real may adversely affect us and the market price of our common shares or ADSs.  For more information, see Note 5(a) to
our 2017 financial statements.

For further information on exchange rate instability impacts, see “Item 5.B. Liquidity and Capital Resources—Indebtedness Financing—

Financial Covenants”.

Developments  and  the  perception  of  risk  in  other  countries,  especially  in  the  United  States  and  in  emerging  market  countries,  may
adversely affect the market price of Brazilian securities, including our common shares and ADSs.

The market price of securities of Brazilian companies is affected to varying degrees by economic and market conditions in other countries,
including the United States and other Latin American and emerging market countries.  Although economic conditions in these countries may
differ  significantly  from  economic  conditions  in  Brazil,  investors’  reactions  to  developments  in  these  other  countries  may  have  an  adverse
effect on the market price of securities of Brazilian issuers.  Crises in other emerging market countries or economic policies of other countries
may diminish investor interest in securities of Brazilian issuers, including ours.  This could adversely affect the market price of our common
shares  or  ADSs,  and  could  also  make  it  more  difficult  for  us  to  access  the  capital  markets  and  finance  our  operations  in  the  future,  on
acceptable terms or at all.

Global financial crises have caused, and in the future may again cause, significant consequences, including in Brazil, such as stock and
credit market volatility, unavailability of credit, higher interest rates, a general slowdown of the world economy, volatile exchange rates, and
inflationary pressure, among others, which may, directly or indirectly, materially and adversely affect us and the price of securities issued by
Brazilian companies, including our common shares and ADSs. 

Risks Relating to Our Control by the State of São Paulo

We  are  controlled  by  the  State  of  São  Paulo,  whose  interests  may  differ  from  the  interests  of  non-controlling  shareholders,  including
holders of ADSs.

As it owns the majority of our common shares, the State is able to determine our operating policies and strategy, control the election of a
majority of the members of our board of directors and appoint our senior management.  As of May 24, 2018, the State owned 50.3% of our
outstanding common shares. Both through its control of our board of directors as well as by enacting State decrees, the State has in the past
directed our company to engage in business activities and make expenditures that promoted political, economic or social goals, but that did not
necessarily enhance our business and results of operations.  The State may direct our company to act in this manner again in the future.  These
decisions by the State may not be in the interests of our non-controlling shareholders, including holders of ADSs.  See “Item 5.A. Operating
and Financial Review and Prospects—Certain Transactions with Controlling Shareholder”.

In January 2015, following the elections for State governor in 2014, the re-elected governor, Mr. Geraldo Alckmin, appointed Mr. Jerson
Kelman  as  our  Chief  Executive  Officer,  and  Mr.  Benedito  Pinto  Ferreira  Braga  Junior,  the  Secretary  of  State  for  the  State  Secretariat  for
Sanitation  and  Water  Resources  (Secretaria  de  Saneamento  e  Recursos  Hídricos  do  Estado  de  São  Paulo),  as  Chairman  of  our  board  of
directors.  In April 2018, Mr. Geraldo Alckmin stepped down from his position as governor in order to run in the presidential elections, and
Mr. Marcio França, who was previously the vice-governor of the State, became governor. With our directors’ terms expiring in April 2018, and
considering  that  Federal  Law  No.  13,303/16  prohibits  the  appointment  of  secretaries  of  state  to  administrative  positions  of  state-controlled
companies, Mr. Mario Engler was appointed by the State as Chairman of our board of directors with a term of two years. In May 2018, Mr.
Marcio  França  appointed  Mrs.  Karla  Bertocco  Trindade  as  our  Chief  Executive  Officer  with  a  term  expiring  in  June  2019.  Additionally,
pursuant  to  our  bylaws,  Mrs.  Karla  Bertocco  Trindade  will  also  be  a  member  of  our  board  of  directors  while  holding  the  position  of  Chief
Executive Officer. Following future elections for State governor, we cannot be sure whether any future State governor will make changes to
our executive board. Changes in policy by State government may cause changes in all or some of the members of our management, which may
have a material adverse effect on our business and results of operations.

In September 2017, the State of São Paulo obtained approval for State Law No. 16,525/2017, which authorizes the State of São Paulo to
set up a controlling company to hold all of the shares that the State of São Paulo holds in our company. Once formed, this controlling company
will  control  our  company,  pursuant  to  the  provisions  of  Art.  116  of  Law  No.  6,404  of  December  15,  1976,  as  amended,  or  the  Brazilian
Corporate  Law.  State  Law  No.  16,525/2017  allows  other  minority  shareholders,  including  private  companies  and  state  companies,  to  hold
shares of the controlling company, provided that the State of São Paulo holds the majority of the common shares of the controlling company. If
and once formed, this controlling company may affect future shareholding in and the control of our company. On March 9, 2018, the State of
São Paulo received a letter from a group of investors expressing interest in acquiring shares of the controlling company. This letter is being
assessed  by  the  State  Privatization  Program’s  Board  (Conselho  Diretor  do  Programa  Estadual  de  Desestatização  -  CDPED),  which  has
authority over our corporate reorganization plan, including the formation of the controlling company. The transaction proposed in the letter
relates only to shares of the controlling company level and therefore would not affect the corporate control of our company, which will remain
held  by  the  State  of  São  Paulo.  The  identity  of  the  investors  and  the  content  of  the  letter  remain  confidential  in  accordance  with  the  rules
applicable to the administrative procedure established by CDPED for the purposes of operation.

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The State and some State entities owe us substantial unpaid debts.  We cannot assure you as to when or whether the State will pay us.

Historically,  the  State  and  some  State  entities  have  delayed  payment  of  substantial  amounts  owed  to  us  related  to  water  and  sewage
services.  As of December 31, 2017, the State owed us R$106.0 million for water and sewage services.  Additionally, the State also owes us
substantial amounts related to reimbursements of State‑mandated special retirement and pension payments that we make to some of our former
employees for which the State is required to reimburse us.  

With respect to payment of pensions on behalf of the State, we had a contested credit amount of R$1,021.7 million as of December 31,
2017.  We do not record this contested amount as a reimbursement credit for actuarial liability due to the uncertainty of payment by the State. 
In addition, as of December 31, 2017, we had a provision for an actuarial liability in the amount of R$2,543.9 million with respect to future
supplemental pension payments for which the State does not accept responsibility.  On March 18, 2015, we, the State and the São Paulo State
Department of Water and Energy (Departamento de Águas e Energia Elétrica do Estado de São Paulo), or “DAEE”, with the intervention of
the  Department  of  Sanitation  and  Water  Resources,  executed  an  agreement  providing  for  payment  of  R$1,012.3  million,  of  which  R$696.3
million  refers  to  principal  and  R$316.0  million  refers  to  monetary  adjustment  of  the  principal  through  February  2015.    For  a  detailed
discussion  of  this  agreement,  see  “Item  7.B.  Related  Party  Transactions—Agreements  with  the  State”  and  Note  10  of  our  2017  financial
statements. 

We have entered into agreements with the State to settle the overdue amounts that relate to water and sewage services.  For a detailed
discussion  of  these  agreements,  see  “Item  7.B.  Related  Party  Transactions—Agreements  with  the  State”  and  Note  10 of  our  2017  financial
statements.

Although the State has complied with agreements negotiated with us in past years, we cannot assure you when or if the State will pay the
contested credit amount, which is still under discussion, and the remaining overdue amounts it owes us.  The amounts owed to us by the State
for water and sewage services and reimbursements for pensions paid may increase in the future.

In addition, certain municipalities and other government entities also owe us payments.  See “—Risks Relating to Our Business—We may
face difficulties in collecting overdue amounts owed to us by municipalities to which we provide water on a wholesale basis and municipal
government entities”.

Our right to draw water from the Guarapiranga and Billings reservoirs may be challenged if another company that uses the reservoirs

does not approve a settlement agreement with us.

We  draw  water  for  use  in  the  São  Paulo  metropolitan  area  from  the  Guarapiranga  and  Billings  reservoirs.    Empresa  Metropolitana  de
Águas e Energia S.A., or EMAE, a company that is also controlled by the State of São Paulo, has a concession to produce hydroelectric energy
using water from the same reservoirs.  EMAE commenced various lawsuits against us in the past seeking compensation for the water we draw
from these reservoirs.  Those lawsuits have now been settled by way of an agreement between EMAE and our company (which is summarized
under “Item 7.  Major Shareholders and Related Party Transactions”).

On April 11, 2016, we were also named in a separate lawsuit commenced by minority shareholders of EMAE against the State of São
Paulo, as controlling shareholder of EMAE.  The minority shareholders are seeking an order to require the State to stop us from drawing water
from  the  reservoirs  without  paying  compensation  to  EMAE,  and  to  allow  EMAE  to  pump  water  from  the  reservoirs  for  its  hydroelectric
facility.  The plaintiffs allege that the State, in its capacity as controlling shareholder of EMAE, has acted unduly to EMAE’s detriment and in
favor of our company.  The settlement agreement between EMAE and us will not necessarily put an end to this separate lawsuit.

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In addition, on August 7, 2017 we were named in a new lawsuit against us, EMAE and the National Electric Energy Agency (Agência
Nacional  de  Energia  Elétrica,  or  ANEEL),  brought  by  Alvaro  Luiz  de  Lima  de  Alvares  Otero,  another  minority  shareholder  of  EMAE,
requesting the annulment of ANEEL’s order approving the settlement agreement mentioned above, as well as the condemnation of SABESP
for  indemnifying  EMAE  for  damages  suffered  by  EMAE.  The  plaintiff  alleges  that  the  order  is  illegal  and  harmful,  jeopardizing  the
operational viability of the Henry Borden hydroelectric power plant, as well as the energy security of the State of São Paulo, the Southeast
region of Brazil and Brazil as a whole. The judge dismissed this lawsuit without judgment on the merits, but this decision remains subject to
appeal.

If one of the ongoing lawsuits by minority shareholders of EMAE requires the State to make a different decision regarding water use, our
ability to draw water from the Guarapiranga and Billings reservoirs may be compromised.  If we were no longer able to draw water from these
reservoirs, we would have to transport water from locations farther away, which would increase our water transportation costs and may affect
our ability to provide adequate service in the region, which may have an adverse effect on our financial condition and results of operations.

Risks Relating to Our Business

The measures we took to mitigate the effects of the drought that occurred in 2014 and 2015 resulted in a significant decrease in the
volume of water billed and revenues from services we provide and, despite the discontinuation in May 2016 of the measures that were used
to face the drought, new consumption habits were incorporated and the volume of water billed continues to be impacted by those measures.

We experience decreases in our water availability from time to time due to droughts.  The southeastern region of Brazil, particularly the
southern region of Minas Gerais State and the Piracicaba, Capivari and Jundiaí river basin, or “PCJ River Basin” (from which we extract most
of the water used in the Cantareira System), and the northern area of the São Paulo metropolitan region experienced below average rainfall
from  2012  to  October  2015.    In  the  October  2013  –  March  2014  rainy  season,  rain  levels  and  water  inflow  into  the  reservoirs  reached  the
lowest stream flow measurements in over 80 years, a scenario that continued in the October 2014 – March 2015 rainy season.  During the
October 2015 – March 2016 and during the October 2016 – March 2017 rainy seasons, the level of rainfall in the region returned to the normal
levels expected for the period.   Improved rainfall during the rainy season of October 2015 – March 2016 and of October 2016 – March 2017,
the collaborative efforts between us and the population we serve and emergency construction conducted by us since 2014 in order to reduce the
impact of the water crisis, resulted in a restoration of the water levels of the Cantareira system.

The worst depletion of water storage occurred in the Cantareira System, the largest system of the São Paulo metropolitan region.  As a
result of the drought and low water volume in the Cantareira System, DAEE and the National Water Agency (Agência Nacional de Águas, or
ANA), continuously regulated the volume of water we were permitted to extract from this system between March 2014 and May 2017.  The
DAEE  and  ANA  determined  this  amount  based  on  levels  of  rainfall,  water  inflow,  level  of  water  in  our  reservoirs  and  the  solicitations  we
made to extract water based on this information, and informed us of the amount we were permitted to extract through periodical notices. In
February 2016, as a result of the return of average rainfall levels to the region, we received authorization to extract 23 cubic meters per second,
or  m³/s,  from  the  Cantareira  System,  an  increase  compared  to  the  13.5  m³/s  we  were  authorized  to  extract  for  the  majority  of  2015,  still
significantly below the water volume we were allowed to extract in the period prior to February 2014, when we were allowed to extract up to a
total of 33 m³/s.  From September to November 2016 we received authorization to extract 25 m³/s, and from December 2016 to May 2017, we
received  authorization  to  extract  31  m³/s.    In  May  2017,  the  water  grant  that  regulates  the  volume  of  water  that  may  be  extracted  from  the
Cantareira System was renewed, based on the volume of water available in the reservoirs. In order to balance supply and demand despite the
restricted water availability, we adopted a series of measures from 2014 to April 2016, including:  (i) using treated water from other production
systems to serve consumers originally supplied by the Cantareira system; (ii) offering discounts (bonus) to consumers that would use below
average  amounts  of  water,  compared  to  average  consumption;  (iii)  reducing  pressure  in  the  water  distribution  lines  in  order  to  decrease
leakage; (iv) adjusting the volume of treated water sold to municipalities that operate their own distribution network; and (v) using pumps in
order to extract water located below the intakes of the Cantareira system, from the so-called “technical reserve”, which had never before been
used to serve the population.  See “Item 4.B. Business Overview—The Recent Water Crisis”.

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With  the  return  of  the  rainfall  to  its  historical  average  for  the  rainy  season  that  began  in  October  2015  and  ended  in  March  2016,  the
volume of water available to the population of the São Paulo metropolitan region returned to a normal level and the measures taken during the
water  crisis  to  continue  to  service  consumers  were  gradually  discontinued.    However,  heightened  public  awareness  of  the  need  to  conserve
water during the crisis resulted in our customers adopting lower water consumption practices during the water crisis and these practices were
partially integrated in our consumers’ daily habits.  As a result of this new behavior, despite us having a higher volume of water available for
treatment, the volume of water billed to our clients did not return to the volume of water billed before the water crisis, in 2013. The average
monthly water production in 2017 for the São Paulo metropolitan region was 60.6 cubic meters per second, or m³/s, compared to 58.5 m³/s in
2016, 52.0 m³/s in 2015, 62.2 m³/s in 2014 and 69.1 m³/s in 2013, the year before the water crisis started. The largest recovery of consumption
occurred in the residential category. The industrial category showed slower growth due to the Brazilian economy and the investments made by
this sector during the water crisis, such as the reuse of water, the use of rainwater and alternative sources of supply.

At the end of March 2018, the total volume of water stored in the reservoirs that supply the metropolitan region of São Paulo was 1,162.8
billion m³ compared to 1,223.9 billion m³ at the end of March 2017 and 1,178.8 billion m³ at the end of March 2016. In addition, the Cantareira
system’s  maximum  storage  capacity,  including  the  technical  reserve  of  287.5  million  m3,  is  1,269.5  billion  m³.    Excluding  the  technical
reserve, which is 287.5 million m³, the Cantareira’s maximum storage capacity is 982.0 million m³.  The volume of water in the Cantareira
system  recovered  throughout  the  October  2015  –  March  2016  rainy  season  and  was  641.9  million  m³  as  of  March  2016,  which  represents
50.6% of its maximum storage capacity, including the technical reserve of 287.5 million m3.  The volume of water in the Cantareira system
was 932 million m³ as of March 31, 2017, which represents 73.4% of its maximum storage capacity, including the technical reserve of 287.5
million m3.  The volume of water in the Cantareira system was 532.3 million m3 (not including the technical reserve of 287.5 million m3) as of
March 31, 2018, as the rain levels and water inflows into the reservoirs that supply the metropolitan region of São Paulo during the October
2017-March 2018 rainy season were below the historical average. In December 2017, 7.8 million inhabitants were serviced by this system,
compared to 7.6 million and 5.4 million in December 2016 and December 2015, respectively.  For more information about the water crisis, see
“Item 4.B. Business Overview—The Recent Water Crisis”. 

The drought prompted a reduction in the volume of water billed, impacting our revenue especially in 2014 and 2015.  In 2014, the water
volume billed decreased 3.1% and the gross operational revenue fell by 6.7% compared to 2013.  In 2015, the water volume billed decreased
8.0% and our gross operational revenue increased slightly by 0.5% compared to 2014.  In 2016, the volume of water billed increased 4%, and
the  gross  operational  revenue  increased  by  24.3%  compared  to  2015.  In  2017,  the  volume  of  water  billed  increased  4.3%  and  the  gross
operational revenue increased by 9.9% compared to 2016.

We cannot assure you that our consumers will revert to their pre-crisis consumption habits or, if at all, when this will occur nor that this

will not adversely affect our financial condition in the future.  See “Item 5.B. Liquidity and Indebtedness Financing—Financial Covenants”.

We are exposed to risks associated with the provision of water and sewage services. 

Our industry is affected by the following risks relating to the provision of water and sewage services:

·        We depend on a water right issued by ANA and the São Paulo State Department of Water and Energy (Departamento de Águas e
Energia  Elétrica  do  Estado  de  São  Paulo,  or  DAEE),  in  order  to  extract  water  from  the  Cantareira  System.    In  May  2017,  the
concession that regulates the volume of water that may be extracted from the Cantareira System, the main water system we use to
serve the São Paulo metropolitan region, based on the volume of water available in the reservoirs was renewed. Under the new terms,
the water we are permitted to draw from the system is divided into five tranches:  (i) if the volume of water available is higher than
60% of the reservoirs’ capacity, we can draw up to 33m3/s; (ii) if the volume of water is between 40% and 60% of the reservoirs’
capacity, we can draw up to 31m3/s; (iii) if the volume of water is between 30% and 40% of the reservoirs’ capacity, we can draw up
to 27m3/s; (iv) if the volume of water is between 20% and 30% of the reservoirs’ capacity, we can draw up to 23m3/s; and (v) if the
volume of water available is lower than 20% of the reservoirs’ capacity, we can draw up to 15.5m3/s.  

·        We are dependent upon energy supplies to conduct our business.  Any shortages or rationing of energy may prevent us from providing
water and sewage services and may also cause material damage to our water and sewage systems when we resume operations.  The
Electric Sector Monitoring Committee (Comitê de Monitoramento do Setor Elétrico – CMSE), has guaranteed the supply of electrical
energy  to  the  National  Interconnection  System  (Sistema  Interligado  Nacional  –  SIN)  in  2018.    Thus,  there  is  no  forecast  of  any
shortages or rationing of energy in 2018.  See “Item 4.B. Business Overview—Energy Consumption”.

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·        We are exposed to various weather-related risks, since our financial performance is closely linked to climate patterns.  The possible
increase  in  the  frequency  of  extreme  weather  conditions  in  the  future  may  adversely  affect  the  water  available  for  abstraction,
treatment,  and  supply.    Droughts  could  adversely  affect  the  water  supply  systems,  resulting  in  a  decrease  in  the  volume  of  water
distributed and billed as well as in the revenue derived from water supply services.  An increase in heavy rainfall could impact the
regular operation of water sources, including abstraction of water from our reservoirs due to increased soil erosion, silting, and runoff
of  pollutants  that  affect  the  aquatic  ecosystems.    See  “Item  4.B.  Business  Overview—Environmental  Matters—  Climate  Change
Regulations:  Reduction of Greenhouse Gases (GHG) Emissions”.

·       The increasing degradation of watershed areas (Mananciais) may affect the quantity and quality of water available to meet demand
from  our  customers.    See  “Item  4.A.  History  and  Development  of  the  Company—Capital  Expenditure  Program”  and  “Item  4.A.
History and Development of the Company —Main Projects of Our Capital Expenditure Program”.

·      In addition to the risks discussed under “—The terms of our agreement to provide water and sewage services in the city of São Paulo
could have a material adverse effect on us,” we may not be able to increase our tariffs on a timely basis, or at all, in order to pass on
increases in inflation or operating expenses, including taxes, to our customers. These constraints may have an adverse effect on our
ability  to  fund  our  capital  expenditure  program  and  financing  activities  and  to  meet  our  debt  service  requirements.  See  “Item  4.B.
Business  Overview—Tariffs—Second  Ordinary  Tariff  Revision  (2017-2020)”  and  “Item  5.A.  Operating  and  Financial  Review  and
Prospects—Factors Affecting Our Results of Operations—Effects of Tariff Increases”.

·        The state and federal government agencies that manage water resources could impose substantial charges for the abstraction of water
from bodies of water and the discharge of sewage.  We may not be able to pass these charges on to our customers.  See “Item 4.B.
Business Overview—Environmental Matters—Water Usage”.  

·               Our water and sewage pipes are susceptible to degradation caused by factors such as age, intense traffic, population density and
commercial  and  industrial  development,  which  may  provoke  accidents  in  the  networks  and  affect  the  regular  provision  of  our
services,  impacting  society  and  the  environment.    See  “Item  4.B.  Business  Overview—Description  of  Our  Activities—Water
Operations—Water Distribution” and “Item 4.B. Business Overview—Description of Our Activities—Sewage Operations—Sewage
System”.

Any of the above may have a material adverse effect on us.

Current  regulatory  uncertainty,  especially  with  regard  to  implementation  and  interpretation  of  the  Brazilian  Basic  Sanitation  Law,  may
have an adverse effect on our business.

Our operations in the state of São Paulo occur both in locations where the planning, monitoring and tariff regulation of basic sanitation
services are responsibilities of the municipalities and in locations where such responsibilities are shared between the State and municipalities.
  The  Basic  Sanitation  Law  No.  11,445/2007  went  into  effect  in  early  2007,  and  although  Federal  Decree  No.  7,217/2010  (as  modified  by
Federal Decree No. 8,211/2014, No. 8,629/2015 and No. 9,254/2017) implemented a series of new principles under the Basic Sanitation Law
in 2010, the full implementation of a number of its provisions remains subject to regulations that the federal government has not yet published.

Law 13,329/16 instituted a “Special Incentive Regime for the Development of Basic Sanitation” (Regime Especial de Incentivos para o
Desenvolvimento  do  Saneamento  Básico  –  REISB),  seeking  to  incentivize  companies  that  provide  public  basic  sanitation  services  to  invest
more through tax credits, starting in 2018 and running until 2026. In 2016, Law 13,312/2016 amended Law No. 11,445/2007 and now includes
the obligation to adopt environmental criteria that include, among other measures, individual metering of water consumption per habitation
unit.  However, since this change is still being implemented and shall only come into effect in 2021, we are not currently able to predict its
impact on our business.

The  Basic  Sanitation  Law  still  requires  that  the  federal  government,  states  and  municipalities  establish  independent  regulators  who
monitor  basic  sanitation  services  and  regulate  tariffs.  In  compliance  with  this  law,  the  state  of  São  Paulo  established  ARSESP  in  2007.
 Currently, our regional and local operations, including tariff regulation, are monitored and regulated by ARSESP, and the remainder of our
operations  is  in  the  process  of negotiating  new  contractual  bases.    Regulatory  agencies  determine  tariff  increases  for  our  water  and  sewage
services, on which our results of operations and financial condition are highly dependent.  As a result, we cannot anticipate all the effects that
the Basic Sanitation Law and the decree will have on our business and operations, if any.

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In 2009, ARSESP enacted rules regarding the following:  (i) general terms and conditions for water and sewage services; (ii) procedures
for communication regarding any failure in our services; (iii) penalties for deficiencies in the provision of basic sanitation services; and (iv)
procedures  for  confidential  treatment  of  our  customers’  private  information.    The  implementation  of  these  and  other  more  recent  rules  will
particularly  impact  our  commercial  and  operations  processes,  and  may  adversely  affect  us  in  ways  we  cannot  currently  predict. 
Implementation  of  these  rules  started  in  2011  and  is  expected  to  continue  for  the  next  few  years.    For  more  information,  see  “Item  4.B.
Business Overview—Government Regulations Applicable to Our Contracts—Rules Enacted by ARSESP”.

In  2011,  ARSESP  altered  the  standard  contract  that  we  are  required  to  use  in  our  relationships  with  retail  customers.    This  alteration
requires  that  invoices  be  sent  to  the  user  of  the  service  rather  than  the  owner  of  the  property.    Since  2011,  we  have  implemented  several
measures and instituted new rules for the update of our clients registry.  Currently, more than 90% of our water and sewage connections are
billed to the user of our services, as foreseen under current regulations. Related to the collection of debt, we are also faced with the challenge
of  collecting  customers’  taxpayer  identification  numbers,  which  are  required  to  register  for  our  services  and  are  needed  for  the  judicial
collection  of  outstanding  fees  in  the  event  of  nonpayment.  We  continuously  update  our  customers’  registration  information,  but  we  face
difficulties in updating this information in areas with high concentrations of social vulnerability and noncompliance.

In August 2012, ARSESP issued Resolution No. 346/2012, which established that users should be compensated for any interruptions in
water  supply.    Implementation  of  this  regulation  has  been  suspended  pending  further  technical  discussions.    In  2013,  ARSESP  held  public
consultations that resumed technical discussions on the subject, but the new resolution that will replace Resolution No. 346/2012 has not yet
been published.

The Basic Sanitation Law No. 11,445/2007 also allows municipalities to create their own regulatory agencies rather than being regulated
by ARSESP.  As a result, a number of municipalities have created their own regulatory agencies.  If other municipalities create new agencies
or retain regulatory powers, we may be subject to their regulation and to any limitations on our services that such agencies may set.  We are
involved in legal proceedings that dispute the authority of these new agencies to regulate and monitor our local contracts and our operations in
metropolitan regions and urban clusters instituted by the State.  We cannot foresee any changes that any such new agencies may implement
regarding our business.  If any such changes are unfavorable, they could materially and adversely affect us.

The State of São Paulo, pursuant to Article 25, Section 3 of the Brazilian Constitution, enacted the State Complementary Law, or “LCE”,
creating the metropolitan regions of São Paulo (LCE No. 94/1974),  Baixada  Santista (LCE No. 815/1996),  Campinas  (LCE  No.  870/2000),
Vale  do  Paraíba  and  Litoral  Norte  (LCE  No.  1,166/2012),  Sorocaba  (LCE  No.  1,241/2014),  and  the  urban  clusters  of  Jundiaí  (LCE
No. 1,146/2011) and Piracicaba (LCE No. 1,178/2012).  These areas incorporate independent municipalities that modify the exercise of their
constitutional competencies, including those related to basic sanitation services, and increase the number of judicial disputes concerning the
regulation and oversight of services in areas currently served by us and regulated by ARSESP.  We cannot anticipate the result of these judicial
disputes and the adverse material effects that may result from them, especially if the rules of regulation and monitoring of services issued by
municipal agencies come to coexist with those already published by ARSESP and implemented into our operational and corporate processes
since 2011.

There are reports that during 2018 there may be a change in legislation that impacts the regulatory framework of the sanitation industry.  If
enacted, this legislation could have a material adverse effect on our business, results of operations and financial condition.  Currently, it is not
possible to predict such effects since the terms of this legislation are not yet known.

For more information on ARSESP regulations, see “Item 4.B. Business Overview—Government Regulations Applicable to Our Contracts

—Rules Enacted by ARSESP—Consumer Relations in the State of São Paulo”.

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It is not possible to predict the impact of the decision by the Brazilian Supreme Court regarding the shared management of basic sanitation services in
metropolitan areas or the effect that this decision may have on our business, activities, financial condition or results of operations

On March 6, 2013, the Brazilian Supreme Court decided a matter related to the shared management of basic sanitation services in the state
of Rio de Janeiro.  In its decision, the court ruled that the state of Rio de Janeiro must establish a new entity, owned by both the state of Rio de
Janeiro and the relevant municipalities, to oversee the planning, regulation and auditing of basic sanitation services in its metropolitan region
with  the  non-partisan  participation  of  all  the  municipalities  located  in  the  metropolitan  region,  creating  a  requirement  that  the  state  and  the
municipalities must participate jointly in the shared management of public services.

However, this decision is not yet fully effective, as a ruling on a motion for clarification is currently pending, and therefore does not yet
alter  the  legislative  framework  regarding  basic  sanitation  that  is  currently  in  effect  for  the  State  of  São  Paulo.  The  São  Paulo  metropolitan
region (including the municipalities to which we provide water on a wholesale basis, but excluding the concession infrastructure construction
revenue) accounted for 70.7% of our gross operating revenue from services in 2017.

In January 2015, the Federal Government issued the Metropolitan Bylaws (Law No. 13,089/2015), amended by Provisional Measure No.
818 of January 11, 2018, establishing within the term of five years, counted from the date of the institution of the metropolitan region or urban
cluster: (i) the general guidelines for the planning, management and performance of public interest initiatives in metropolitan regions and in
urban clusters instituted by the states; (ii) the general planning standards for integrated urban development and other interfederal governance
instruments;  and  (iii)  the  criteria  to  receive  federal  loans  related  to  urban  development.  In  addition,  the  Metropolitan  Bylaws  foresees
mechanisms for integrated management and interfederal governance as well as the sharing of decisions by regional entities.

Despite the Brazilian Supreme Court’s March 6, 2013 decision and the Metropolitan Bylaws, some municipalities in metropolitan regions
and  urban  clusters,  including  in  metropolitan  regions  where  we  operate,  have  been  conducting  bidding  processes  for  the  concession  of
sanitation  services  without  including  shared  management.We  cannot  predict  the  effect  of  this  non-compliance  of  the  shared  management
requirement  on  our  business,  financial  condition  or  results  of  operations.  Furthermore,  we  cannot  predict  how  the  shared  management
requirement will be carried out in the São Paulo metropolitan region and other municipalities in which we operate or what effect the shared
management may have on our business, financial condition or results of operation.

For  more  information  on  services  in  metropolitan  regions,  see  “Item  4.B.  Business  Overview—Government  Regulations  Applicable  to

Our Contracts—Agreements with Municipalities and Metropolitan Regions”.

The terms of our agreement to provide water and sewage services in the city of São Paulo could have a material adverse effect on us.

The  provision  of  water  and  sewage  services  in  the  city  of  São  Paulo  accounted  for  50.1% of  our  gross  operating  revenues  (excluding

revenues relating to the construction of concession infrastructure) in the year ended December 31, 2017.

On June 23, 2010, the State and the city of São Paulo executed an agreement in the form of a convênio with our and ARSESP’s consent,
under which they agreed to manage the planning and investment for the basic sanitation system of the city of São Paulo on a joint basis.  In
application  of  the convênio,  we  executed  a  separate  contract  dated  June  23,  2010  with  the  State  and  the  city  of  São  Paulo,  to  regulate  the
provision of these services for the following 30 years.  Among other principal terms of this separate agreement, we must transfer 7.5% of the
gross revenues we derive under the convênio and subtract (i) COFINS and PASEP taxes and (ii) unpaid bills of publicly owned properties in
the city of São Paulo, to the Municipal Fund for Environmental Sanitation and Infrastructure (Fundo Municipal de Saneamento Ambiental e
Infraestrutura), established by Municipal Law No. 14,934/2009.  See “Item 7.B. Related Party Transactions—Agreement with the State and
the city of São Paulo” for further discussion of the principal terms of the convênio and principal terms of the separate contract we executed in
application of the convênio. 

ARSESP is required to ensure that the tariffs will adequately compensate us for the services we provide, which includes the pass-through
to tariffs. However, our existing tariff and adjustment formulas have never included the charge to consumers related to the transfer of 7.5% of
the  gross  revenues  obtained  from  providing  sanitation  services  in  the  municipality  of  São  Paulo  to  the  São  Paulo  Municipal  Fund  for
Environmental Sanitation and Infrastructure as established under the convênio. 

In March 2013, ARSESP issued Resolution No. 407/2013 authorizing us to pass through to the service bill the 7.5% transfer to the São
Paulo Municipal Sanitation and Infrastructure Fund as a legal charge, as defined by municipal legislation.  However, pursuant to the Sewage
and Water Supply Service Contracts, this charge must be included in the calculation of the tariff.

In April 2013, ARSESP issued Resolution No. 413/2013, which  suspended Resolution No. 407/2013 until the conclusion of the first tariff
revision  process,  thereby  postponing  our  authorization  to  pass  the  charge  through  to  consumers  on  the  service  bill.    The  postponement  of
Resolution No. 407/2013 was due to a request from the São Paulo State Government to analyze, among other things, methods of reducing the
impact on consumers. 

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In  April  2014,  ARSESP  issued  Resolution  No.  484/2014,  (further  ratified  by  Resolution  No.  520,  issued  November  2014),  which
established the conclusion of the first tariff revision.  However, the State and the city of São Paulo requested to maintain the suspension of
ARSESP Resolution No. 407/2013, postponing our authorization to pass the charge through to consumers on the service bill, until the revision
of our contract with the State and city of São Paulo is concluded.

In May 2014, ARSESP issued Resolution No. 488/2014, which maintained the suspension of Resolution ARSESP No. 407/2013 until the
results are obtained in the revision of the contract signed between us, the city and the State of São Paulo, thereby delaying the authorization to
pass the charge through to consumers on the service bill. 

In December 2016, we concluded the first four-year revision of our contract with the city of São Paulo, which altered our service quality,

investment and investment tracking targets. However, the issue of the 7.5% charge was not discussed.

As  of  December  31,  2017,  we  have  transferred  approximately  R$2.6  billion  to  the  São  Paulo  Municipal  Fund  for  Environmental

Sanitation and Infrastructure since 2010.  We cannot assure you when and how we will recover this amount.  

In  January  2018,  the  second  step  of  our  Second  Ordinary  Tariff  Revision  was  initiated.  In  this  review,  the  possibility  of  including  the
average tariff in the portion related to transfers to municipal funds, as is the case with the 7.5% that we transfer to the São Paulo Municipal
Fund for Environmental Sanitation and Infrastructure was discussed.

On May 9, 2018 ARSESP announced the final results of the Second Ordinary Tariff Revision, recognizing the regulatory limit of 4% of
each  municipality’s  direct  operating  revenue  in  the  tariff  calculation.  As  a  result,  1.84%  was  declared  the  tariff  for  the  Municipality  of  São
Paulo, corresponding to the 4% regulatory limit.

On May 24, 2018, as a result of the final result of the Second Ordinary Tariff Revision, we filed a reconsideration request as well as a
clarification and revision request with ARSESP. As part of the clarification and revision request, we requested that ARSESP provide a revision
of the calculation of the financial component related to municipal funds. For more information, see “Item 4.B. Business Overview—Tariffs—
Second Ordinary Tariff Revision (2017-2020).”

We cannot assure you that this 7.5% charge will eventually be passed in full through to customers or that the continued delay in passing
this charge in full through to customers will not further affect our financial condition. For additional information on ARSESP regulations, see
“Item 4.B. Business Overview—Tariffs” and “Item 4.B. Business Overview—Government Regulations Applicable to Our Contracts—Rules
Enacted by ARSESP”.

We  currently  lack  formal  agreements  or  concessions  with  51    of  the  municipalities  to  which  we  provide  service,  and  32  of  our  existing
concession agreements will expire between 2018 and 2030.  We may face difficulties in continuing to provide water and sewage services in
return for payment in these and other municipalities, and we cannot assure you that they will continue to purchase services from us on the
same terms or at all.

As  of  December  31,  2017,  we  held  formal  30-year  agreements  with  287  municipalities  (including  the  city  of  São  Paulo)  of  the  368
municipalities we serve.  We entered into six of these agreements during 2017.  The 287  municipalities with which we had formal agreements
at  year-end  accounted  for  81.7%    of  our  total  revenues  for  the  year  ended  December  31,  2017,  and  72.3%    of  our  intangible  assets  as  of
December 31, 2017.  Of the 51 served municipalities for which we lacked formal agreements at year-end, we were in the process of actively
renegotiating  with  all  municipalities.  Together,  these  51  municipalities  accounted  for  10.3%  of  our  total  revenues  for  the  year  ended
December  31,  2017  and  19.6%  of  our  intangible  assets  as  of  that  same  date.    Between  2018  and  2030,  32  of  our  existing  concession
agreements will expire. These 32 concession agreements accounted for 6.2% of our total revenues for the year ended December 31, 2017 and
5.7% of our intangible assets as of that same date.

We  may  not  be  able  to  continue  providing  service  on  current  terms,  or  at  all,  in  the  municipalities  for  which  we  do  not  have  formal
agreements, including the 51 for which we are renegotiating expired agreements.  In particular, the lack of formal concessions or contractual
rights in these municipalities means that we may not be able to enforce our right to continue to provide services and we may face difficulties in
being paid on a timely basis, or at all, for the unamortized assets.  If we are successful in renegotiating the expired agreements, or executing
formal  agreements  with  the  municipalities  for  which  we  have  never  had  agreements,  those  agreements  may  not  contain  terms  that  are  as
favorable as those under which we currently operate. We cannot make any such assumption because the Basic Sanitation Law prevents us from
planning,  regulating  and  monitoring  our  services  and  it  requires  more  stringent  control  by  the  municipalities  or  by  ARSESP.    The
municipalities for which we do not have formal agreements may choose to start providing water and sewage services directly themselves, or
may run public tenders to select another provider.  They may set eligibility requirements for which we do not qualify and, if we do qualify and
participate in these tenders, we may not win.

Any of these events could have a material adverse effect on our business, results of operations and financial condition.  See “Item 4.B.
Business Overview—Our Operations” and “Item 4.B. Business Overview—Government Regulations Applicable to our Contracts—Contracts
for the Provision of Essential Basic Sanitation Services in Brazil.”

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In  the  municipalities  with  which  we  did  not  have  formal  agreements  by  December  31,  2017,  we  continued  operating  with  municipal

approval or with judicial support.

Municipalities may terminate our concessions before they expire in certain circumstances.  The indemnification payments we receive in
such cases may be less than the value of the investments we made.

Municipalities  have  the  right  to  terminate  our  concessions  if  we  fail  to  comply  with  our  contractual  or  legal  obligations  or  if  the
municipality  determines  in  an  expropriation  proceeding  that  early  termination  of  the  concession  is  in  the  public  interest.  If  a  municipality
terminates our concession, we are entitled to be indemnified for the unamortized portion of our investments. 

The Basic Sanitation Law provides that on early termination of a concession, the entity that provides sanitation services should carry out a
valuation of the assets that relate to the services provided, in order to calculate the unamortized portion of its investments.  This valuation uses
the criteria defined in the service contract or, in the absence of a contract, is based on customary practice with respect to the services for the
preceding  20  years.    The  resulting  indemnification  payment  may  be  less  than  the  remaining  value  of  the  investments  the  sanitation  service
provider made.  Nonetheless, the indemnification payments may not occur voluntarily by the municipality, creating an opportunity for judicial
dispute.  If faced with such a situation, there is the risk that the judicial decision will consider the indemnification as undue or set it at a lower
value than that of our investments.

With  regard  to  our  operations  that  lack  contracts  or  have  indefinite  or  overdue  timeframes,  the  Basic  Sanitation  Law  reduced  the
maximum time period for payment of indemnification in such cases to four years.  This provision applies to concession agreements entered
into  prior  to  the  enactment  of  the  Basic  Sanitation  Law  only  to  the  extent  that  the  concession  agreement  does  not  contain  a  contractual
indemnification provision, or we have not otherwise entered into an agreement with the municipality with regard to such early termination. 
These provisions have not yet been tested by the courts and we are therefore unable to predict the effect of the Basic Sanitation Law on our
rights to indemnification for the early termination of any particular concession.

We  have  been,  and  are  currently  party  to  concession-related  proceedings  related  to  indemnification  issues  regarding  the  resumption  of
water  supply  and  sewage  collection  services  by  some  municipalities.  For  more  information,  see  Note  19  to  our  2017  financial  statements
included in this annual report. Other municipalities may seek to terminate their concession agreements before the contractual expiration date. 
If this occurs and we do not receive adequate indemnification for our investments, or the indemnification is paid over an extended period, we
may suffer material harm to our financial position.

We may face difficulties in collecting overdue amounts owed to us by municipalities to which we provide water on a wholesale basis and
municipal government entities.

As  of  December  31,  2017,  our  total  accounts  receivable  was  R$5,538.7  million.  Of  this  amount,  certain  municipalities  to  which  we
provide water on a wholesale basis owed us R$2,568.2 million, and certain municipal government entities owed us R$817.9 million.  Of the
total amount owed by municipalities, R$189.0 million was overdue by between 30 and 360 days and R$2,355.7 million was overdue by over
360 days.

The  Brazilian  courts  are  entitled  to  obligate  us  to  continue  to  supply  water  to  these  municipalities,  even  when  we  have  not  received
payments due to us.  We have no way of ensuring that negotiations with these municipalities or legal action taken against the municipalities
will result in payments being made.  For example, the municipalities of Santo André, Guarulhos and Mauá owe us significant sums in respect
of  water  that  we  have  been  providing  to  them  on  a  wholesale  basis.    We  have  intensified  the  process  of  collecting  these  sums  and  other
amounts, and we executed Protocols of Intentions with Santo André, Guarulhos and Mauá in late 2015 and early 2016 seeking to resolve the
outstanding amounts and restore normal commercial relations with them.  In those three cases, the Protocol of Intentions was terminated. 

In April 2017, we signed a Protocol of Intentions with the Autonomous Service of Water and Sewage of Guarulhos (“SAAE” - Serviço
Autônomo  de  Água  e  Esgoto  de  Guarulhos)  to  evaluate  (i)  possible  solutions  to  commercial  relations  between  the  municipality  and  our
company and (ii) existing debts owed to us by SAAE. In August 2017, we announced that Guarulhos and us decided to move forward with the
development of: (i) a judicial agreement for SAAE to pay the debt owed to us in installments, and (ii) an interdependence agreement for us to
provide the municipality of Guarulhos’ water supply on a wholesale basis.

We are currently negotiating the terms of these agreements and we cannot guarantee when and if definitive agreements will be signed. In
2017, the municipality of Guarulhos paid around 80% of its monthly bills on time. For more information, see "Item 4.B. Business Overview-
Description of Our Activities-Wholesale Operations-Wholesale Water Services".

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With respect to the municipality of Santo André, we signed a protocol of intention on May 11, 2017 and since then we have been working
with the municipality of Santo André on the preparation of studies and evaluations aimed at balancing commercial relations and debts existing
between the municipality and our company.

With respect to the municipality of Mauá, on April 19, 2018 we published a press release stating that we have been in contact with the
municipality of Mauá regarding directly supplying water to four neighborhoods that have been affected by a water shortage, and that we will
initiate formal discussions to engage in negotiations with the municipality.

For  more  information  on  wholesale  operations,  see  “Item  4.B.  Business  Overview—Description  of  Our  Activities—Wholesale
Operations”.    In  addition,  some  entities  associated  with  municipal  governments  for  which  we  provide  services  also  do  not  make  regular
payments.  We cannot guarantee if or when these entities will make payments on a regular basis or pay the amounts they owe us.  If these
municipalities and related entities do not pay the amounts they owe us, we may suffer further material harm to our financial position.

Any failure to obtain new financing may adversely affect our ability to continue our capital expenditure program.

Our capital expenditure program will require resources of approximately R$17.3 billion in the period from 2018 through 2022.  In 2017

we recorded R$3.4 billion in capital expenditures.

In addition to cash generated by our operations, we have funded and intend to continue funding these capital expenditures with issuances
of  debt  securities  in  the  domestic  and  international  capital  markets  as  well  as  borrowings  in  Brazilian  reais  and  foreign  currencies.    A
significant  portion  of  our  financing  needs  is  obtained  through  long‑term  financing  at  attractive  interest  rates  from  Brazilian  federal  public
banks, multilateral agencies and international governmental development banks.  If the Brazilian government changes its policies regarding the
financing of water and sewage services, or if we fail to obtain long‑term financing at attractive interest rates from domestic and international
multilateral  agencies  and  development  banks  in  the  future,  we  may  not  be  able  to  meet  our  obligations  or  finance  our  capital  expenditure
program, which could have a material adverse effect on our business and financial condition.

Furthermore, Brazilian public and private financial institutions are legally limited up to a certain percentage of their shareholder’s equity
to provide loans to public sector entities, including, for example, us.  These limitations could adversely affect our ability to continue our capital
expenditure program.

Our debt includes financial covenants that impose indebtedness limits on us.  Our failure to comply with these covenants could seriously
impair our ability to finance our capital expenditure program, which could have a material adverse effect on us.  For further information on
these covenants, see “Item 5.B. Liquidity and Capital Resources—Indebtedness Financing—Financial Covenants”. 

Compliance with environmental laws and environmental liability payments could have a material adverse effect on us.

We are subject to extensive Brazilian federal, state and municipal laws and regulations relating to the protection of human health and the
environment.  These laws and regulations set potable water standards and limit or prohibit the discharge or spillage of effluent produced in our
operations,  particularly  raw  sewage.    We  occasionally  suffer  accidents  such  as  leakages  or  breaks  in  pipes  that  could  lead  to  liability  for
damages under environmental law.  We could be subject to various types of criminal, administrative and civil proceedings for non-compliance
with environmental laws and regulations that could expose us to penalties and criminal sanctions, such as fines, closure orders and significant
indemnification  obligations.    The  scope  and  enforcement  of  environmental  laws  in  Brazil  are  becoming  more  stringent,  and  our  capital
expenditures and environmental compliance costs may increase substantially as a result.  These expenses may lead us to reduce expenditure on
strategic investments, which could harm our business.  In addition, Brazilian courts are enforcing environmental laws more stringently than in
the past, which may result in fines or liability for damages that are significantly higher than those we currently anticipate.  We are party to
various  environmental  proceedings  that  could  have  a  material  adverse  impact  on  us,  including  civil  processes  and  investigations  relating,
among others, to the release of untreated sewage into waterways or the disposal of sludge generated by treatment plants.  More recently, we are
involved  in  proceedings  challenging  the  extraction  of  water  resources  in  the  face  of  the  recent  water  crisis.    Any  unfavorable  judgment  in
relation to these proceedings, or any material environmental liabilities, may have a material adverse effect on us.  For further information on
these  proceedings,  see  “Item  8.A.  Financial  Statements  and  Other  Financial  Information—Legal  Proceedings”.    For  further  information  on
investments in environmental programs, see “Item 4.A. History and Development of the Company—Main Projects of our Capital Expenditure
Program”, “Item 4.B. Business Overview—Description of our Activities—Sewage Operations—Sewage Treatment and Disposal”, “Item 4.B
Business Overview—Environmental Matters” and “Item 4.B. Business Overview— Environmental Matters—Environmental Regulation”.  For
further information on the Water Crisis, see “Item 4.B. Business Overview—The Recent Water Crisis”.  

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New laws and regulations relating to climate change and changes in existing regulation, as well as the escalation of the physical effects of
extreme weather events, may result in increased liabilities and increased capital expenditures, which could have a material adverse effect
on us.

Current  federal,  state  and  municipal  laws  and  regulations  on  climate  change  establish  global  goals,  which  we  will  have  to  meet,
concerning greenhouse gas emissions and this may require us to increase our investments in order to comply with these laws.  Currently, such
goals  have  not  yet  been  established  for  the  sanitation  sector,  however,  if  we  increase  our  capital  expenditures  for  this  purpose,  we  may  be
required to reduce expenditures on other strategic investments.

In  addition,  climate  change  may  lead  to  increased  frequency  of  extreme  weather  events  such  as  droughts  or  torrential  rain,  which  may

affect our ability to deliver our services and require us to strengthen our actions such as:

·        investing in seeking new water sources located further from major consumer centers;

·        investing in new technologies; 

·               improvement of water conservation practices and demand management alternatives such as economic mechanisms or educational

programs; and

·        increasing the capacity of our water reserves.

Extreme  weather  events  such  as  torrential  rain  may  also  cause  impacts  to  our  installations  that  can  lead  to  negative  impacts  to  the

environment and society.

A rise in sea level could result in increased salinity in the river estuaries where we abstract water, which could affect water treatment in

these areas.  Rising sea levels could also cause damage in our sewage collection network. 

Additionally,  increases  in  air  temperature  could  affect  demand  for  water.    Extreme  weather  events  may  also  reduce  water  levels  in  the
reservoirs  that  power  hydroelectric  power  plants  in  Brazil,  which  may  cause  energy  shortages  and  increase  electricity  prices,  which  may
adversely affect our costs and operations.

We cannot predict all of the effects of extreme weather events, therefore making it difficult to predict necessary investments.  We have not
provisioned  any  funds  for  climate  change  events  as  current  technology  and  scientific  understandings  of  climate  change  make  it  difficult  to
predict potential expenses and liabilities. 

We may be required to adopt new norms to improve our energy use efficiency and minimize the release of greenhouse gases when we

renew the environmental licenses for the systems already in operation or when we obtain environmental licenses for new enterprises.

We may need to make substantial new expenditures, either to comply with new environmental regulations linked to climate change or to
prevent  or  correct  the  physical  effects  of  extreme  weather  events,  any  of  which  could  have  a  material  adverse  effect  on  our  results  of
operations.

For  more  information,  see  “Item  4.B.  Business  Overview—Environmental  Matters—Climate  Change  Regulations:    Reduction  of

Greenhouse Gases (GHG) Emissions” and “Item 4.B. Business Overview—Energy Consumption”.

Any substantial monetary judgment against us in legal proceedings may have a material adverse effect on us.

We are party to a number of legal proceedings involving significant monetary claims.  These legal proceedings include, among others,
civil, tax, labor, corporate and environmental issues.  As of December 31, 2017, the estimated total claims asserted was R$55,705.2 million
(net of R$461.4 million in escrow deposits), including contingent liabilities.  A substantial monetary judgment against us in one or more of
these  legal  proceedings  may  have  a  material  adverse  effect  on  our  financial  condition.    We  have  recognized  provisions  totaling  R$1,078.2
million (net of escrow deposits) as of December 31, 2017. For more information, see Note 19 to our 2017 financial statements included in this
annual  report.  These  provisions  do  not  cover  all  legal  proceedings  involving  monetary  claims  filed  against  us  and  it  may  be  insufficient  to
cover the ultimate resolution of these claims.  Any unfavorable judgment in relation to these proceedings may have a material adverse effect on
us.  For more information, see “Item 8.A. Financial Statements and Other Financial Information—Legal Proceedings”.

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Our business is subject to cyberattacks and security and privacy breaches.

Our business involves the collection, storage, processing and transmission of customers’, suppliers and employees’ personal or sensitive
data.  We also use key information technology systems for controlling water, sewage and commercial, administrative and financial operations.
An increasing number of organizations, including large businesses, financial institutions and government institutions, have disclosed breaches
of  their  information  technology  and  information  security  systems,  some  of  which  have  involved  sophisticated  and  highly  targeted  attacks,
including on portions of their websites or infrastructure.

The  techniques  used  to  obtain  unauthorized,  improper  or  illegal  access  to  our  systems,  our  data  or  our  customers’  data,  to  disable  or
degrade service, or to sabotage systems are constantly evolving, may be difficult to detect quickly, and often are not recognized until launched
against a target.  Unauthorized parties may attempt to gain access to our systems or facilities through various means, including, among others,
hacking  into  our  systems  or  those  of  our  customers,  partners  or  vendors,  or  attempting  to  fraudulently  induce  our  employees,  customers,
partners, vendors or other users of our systems into disclosing user names, passwords or other sensitive information, which may in turn be used
to access our information technology systems.  Certain efforts may be supported by significant financial and technological resources, making
them even more sophisticated and difficult to detect. 

We  have  established  an  Information  Security  Committee  with  members  appointed  by  our  executive  officers.  The  mission  of  this
committee  is  to  undertake  projects  and  actions  related  to  the  protection  or  mitigation  of  the  vulnerabilities  and  risks  of  our  information
technology assets. Although we have developed systems and processes, such as this committee, that are designed to protect our data, the data
of  our  customers,  employees  and  suppliers,  and  to  prevent  data  loss  and  other  security  breaches,  these  security  measures  cannot  provide
absolute security.  Our information technology and infrastructure may be vulnerable to cyberattacks or security breaches, and third parties may
be able to access our customers’, suppliers’ and employees’ personal or proprietary information that are stored on or accessible through those
systems.    Our  security  measures  may  also  be  breached  due  to  human  error,  malfeasance,  system  errors  or  vulnerabilities,  or  other
irregularities.    Any  actual  or  perceived  breach  of  our  security  could  interrupt  our  operations,  result  in  our  systems  or  services  being
unavailable, result in improper disclosure of data, materially harm our reputation and brand, result in significant legal and financial exposure,
lead  to  loss  of  customer  confidence  in,  or  decreased  use  of,  our  products  and  services,  and  adversely  affect  our  business  and  results  of
operations.  In addition, any breaches of network or data security at our suppliers (including data center and cloud computing providers) could
have similar negative effects.  Actual or perceived vulnerabilities or data breaches may lead to claims against us. We cannot guarantee that the
protections  we  have  in  place  to  protect  our  operating  technology  and  information  technology  systems  are  sufficient  to  protect  against
cyberattacks and security and privacy breaches.

Risks Relating to Our Common Shares and ADSs

We may not always be in a position to pay dividends or interest on shareholders’ equity and ADSs.

Depending on our future results, our shareholders may not receive dividends or interest on own capital if we do not generate a profit. 
Despite the requirement to distribute a minimum of 25% of our annual net income to shareholders, our future financial position may not permit
us to distribute dividends or pay interest on own capital.

The  relative  volatility  and  illiquidity  of  the  Brazilian  securities  markets  may  substantially  limit  your  ability  to  sell  our  common  shares
underlying the ADSs at the price and time you desire.

Investing in securities from emerging markets such as Brazil involves greater risk than investing in securities of issuers in major securities
markets, and these investments are often considered to be more speculative in nature.  The Brazilian securities market is substantially smaller,
less liquid, more concentrated and can be more volatile than major securities markets.  Accordingly, although you are entitled to withdraw the
common shares underlying the ADSs from the depositary at any time, your ability to sell the common shares underlying the ADSs at a price
and time at which you wish to do so may be substantially limited.  There is also significantly greater concentration in the Brazilian securities
market than in major securities markets.  The ten largest companies in terms of market capitalization represented approximately 52.5% of the
aggregate market capitalization of the B3 as of December 31, 2017. 

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Investors  who  exchange  ADSs  for  common  shares  may  lose  their  ability  to  remit  foreign  currency  abroad  and  obtain  Brazilian  tax
advantages.

The Brazilian custodian for the common shares underlying our ADSs must obtain a certificate of registration from the Central Bank in
order to be entitled to remit U.S. dollars abroad for payments of dividends and other distributions relating to our common shares or upon sales
of our common shares.  If an ADR holder decides to exchange ADSs for the underlying common shares, the holder will be entitled to continue
to rely on the custodian’s certificate of registration for five business days from the date of exchange.  After that period, the holder may not be
able to obtain and remit U.S. dollars abroad upon sale of our common shares, or distributions relating to our common shares, unless he or she
obtains his or her own certificate of registration or registers the investment under CMN Resolution No. 4,373/2014, dated September 29, 2014,
which entitles registered foreign investors (the “4,373 Holder”) to buy and sell on a Brazilian stock exchange.  If the holder does not obtain a
certificate of registration or register under Resolution No. 4,373/2014, the holder will generally be subject to less favorable tax treatment on
gains with respect to our common shares.

If a holder attempts to obtain his or her own certificate of registration, the holder may incur expenses or suffer delays in the application
process, which could delay his or her ability to receive dividends or distributions relating to our common shares or the return of his or her
capital in a timely manner.  The custodian’s certificate of registration or any foreign capital registration obtained by a holder may be affected
by  future  legislative  changes,  and  additional  restrictions  applicable  to  the  holder,  the  disposition  of  the  underlying  common  shares  or  the
repatriation of the proceeds of disposition may be imposed in the future.

A holder of common shares or ADSs may face difficulties in protecting his or her interests as a shareholder because we are a Brazilian
mixed capital company.

We are a mixed capital company (sociedade de economia mista) organized under the laws of Brazil, and all of our directors and officers
and our controlling shareholder reside in Brazil.  All of our assets are located in Brazil.  As a result, it may not be possible for a holder to effect
service of process upon us or these other persons within the United States or other jurisdictions outside Brazil or to enforce against us or these
other  persons  judgments  obtained  in  the  United  States  or  other  jurisdictions  outside  Brazil.    Because  judgments  of  U.S.  courts  for  civil
liabilities based upon the U.S. federal securities laws may only be enforced in Brazil if certain requirements are met, a holder may face more
difficulty  in  protecting  his  or  her  interests  in  the  case  of  actions  by  our  directors,  officers  or  our  controlling  shareholder  than  would
shareholders of a corporation incorporated in a state or other jurisdiction of the United States.  In addition, under Brazilian law, none of our
assets  which  are  essential  to  our  ability  to  render  public  services  are  subject  to  seizure  or  attachment.    Furthermore,  the  execution  of  a
judgment against our controlling shareholder may be delayed, since the State may only be able to pay a judgment if it is provided for in its
budget in a subsequent fiscal year.  None of the public property of our controlling shareholder is available for seizure or attachment, either
prior to or after judgment.

Mandatory arbitration provisions in our bylaws may limit the ability of a holder of our ADSs to enforce liability under U.S. securities laws.

Under our bylaws, any disputes among us, our shareholders and our management with respect to the Novo Mercado rules, the Brazilian
Corporate Law and Brazilian capital markets regulations will be resolved by arbitration conducted pursuant to the B3 Arbitration Rules in the
Market  Arbitration  Chamber.    Any  disputes  among  shareholders  and  ADR  holders,  and  any  disputes  between  us  and  our  shareholders  and
ADR holders, will also be submitted to arbitration.  As a result, a court in the United States might require that a claim brought by an ADR
holder predicated upon the U.S. securities laws be submitted to arbitration in accordance with our bylaws.  In that event, a purchaser of ADSs
would be effectively precluded from pursuing remedies under the U.S. securities laws in the U.S. courts.  However, a court in the United States
could allow claims predicated upon the U.S. securities laws brought by holders who purchased ADSs on the NYSE to be submitted to U.S.
courts.

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A holder of our common shares and ADSs might be unable to exercise preemptive rights and tag‑along rights with respect to the common
shares.

U.S.  holders  of  common  shares  and  ADSs  may  not  be  able  to  exercise  the  preemptive  rights  and  tag‑along  rights  relating  to  common
shares unless a registration statement under the U.S. Securities Act of 1933, as amended, or the Securities Act, is effective with respect to those
rights  or  an  exemption  from  the  registration  requirements  of  the  Securities  Act  is  available.    We  are  not  obligated  to  file  a  registration
statement  with  respect  to  our  common  shares  relating  to  these  rights,  and  we  cannot  assure  you  that  we  will  file  any  such  registration
statement.    Unless  we  file  a  registration  statement  or  an  exemption  from  registration  is  available,  an  ADR  holder  may  receive  only  the  net
proceeds from the sale of his or her preemptive rights and tag‑along rights or, if these rights cannot be sold, they will lapse and the ADR holder
will receive no value for them. 

Holders of our ADSs do not have the same voting rights as our shareholders.

Holders of our ADSs do not have the same voting rights as holders of our shares.  Holders of our ADSs are entitled to the contractual
rights set forth for their benefit under the deposit agreements.  ADS holders exercise voting rights by providing instructions to the depositary,
as opposed to attending shareholders meetings or voting by other means available to shareholders.  In practice, the ability of a holder of ADSs
to instruct the depositary as to voting will depend on the timing and procedures for providing instructions to the depositary, either directly or
through  the  holder’s  custodian  and  clearing  system.    The  deposit  agreement  also  provides  that  if  the  depositary  does  not  receive  any
instructions  from  a  holder  of  ADRs,  the  ADR  holder  may  be  deemed  to  have  given  a  discretionary  proxy  to  a  person  designated  by  our
company and the underlying shares may be voted by such person.  However, we have chosen not to designate any person to exercise these
deemed proxy rights with respect to any annual or special general meetings, and ADSs for which no specific voting instructions were received
by the Depositary were therefore not voted at that meeting.

 ITEM 4.            INFORMATION ON THE COMPANY

A.      History and Development of the Company

Overview

Companhia de Saneamento Básico do Estado de São Paulo – SABESP is a mixed capital company (sociedade de economia mista) with
limited liability.  We were incorporated on September 6, 1973 under the laws of the Federative Republic of Brazil.  We are registered with the
Commercial Registry of the State of São Paulo (Junta Comercial do Estado de São Paulo)  under  registration  number  NIRE  35300016831. 
Our  principal  executive  offices  are  located  at  Rua  Costa  Carvalho,  300,  05429‑900  São  Paulo,  SP,  Brazil.    Our  telephone  number  is
+55 11 3388‑8000.  Our agent for service of process in the United States is CT Corporation System, with offices at 818 West Seventh Street –
Team 1, Los Angeles, CA 90017.  We are allowed to operate, in a subsidiary form, in other Brazilian locations and abroad.  See “Item 4.B.
Business  Overview—  Government  Regulations  Applicable  to  Our  Contracts—Contracts  for  the  Provision  of  Essential  Basic  Sanitation
Services in Brazil”.

We  believe  we  are  one  of  the  largest  water  and  sewage  service  providers  in  the  world  (based  on  the  number  of  customers  in  2014,
according to the inDepth Water Yearbook 2014-2015). We operate water and sewage systems in the state of São Paulo, which includes the city
of São Paulo, Brazil’s largest city.  According to the IBGE, the state of São Paulo is Brazil’s most populous state and the state with the highest
gross domestic product, or GDP, in Brazil.  For the year ended December 31, 2017, we generated net revenue of R$14,608.2 million and net
income of R$2,519.3 million.  Our total assets amounted to R$39,546.4 million and our total shareholders’ equity amounted to R$17,513.0
million as of December 31, 2017.

As  of  December  31,  2017,  we  provided  water  and  sewage  services  to  a  broad  range  of  residential,  commercial,  industrial  and
governmental customers in 368 of the 645 municipalities in the state of São Paulo, including the city of São Paulo.  Substantially all of our
concessions or program agreements have 30‑year terms.  As of December 31, 2017, we lacked formal agreements for 51 of the municipalities
we serve, each of which we are currently in the process of renegotiation.  From January 1, 2018 through 2030, 32 further concessions will
expire, and we will seek to replace them with program agreements.  In addition to the 368 municipalities we served, we also provided water
service to the municipality of Mogi das Cruzes, pursuant to two partial water contracts under which we service only certain neighborhoods of
that  municipality.  See  “Presentation  of  Financial  and  Other  Information—Other  Information—Our  Contracts  and  the  Municipalities  We
Serve”.

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We also supply water on a wholesale basis to five municipalities in the São Paulo metropolitan region in which we do not operate water
distribution systems (together covering a total estimated urban population of approximately 3.0 million residents). Four of these municipalities
also  utilize  our  sewage  treatment  services.    For  the  year  ended  December  31,  2017,  the  São  Paulo  metropolitan  region  (including  the
municipalities  to  which  we  provide  water  on  a  wholesale  basis)  accounted  for  70.7%  of  our  gross  operating  revenue  (excluding  revenues
relating to the construction of concession infrastructure), while the Regional Systems accounted for 29.3%.

As  of  December  31,  2017,  we  provided  water  services  through  8.9  million  water  connections  to  approximately  24.9  million  people,
representing approximately 57% of the total population of the state of São Paulo, and had a water coverage ratio of 98% with respect to all
regions.  As of that date, we provided sewage services through 7.3 million sewage connections to approximately 21.6 million people and had
an  effective  sewage  service  ratio  of  83%.    As  of  December  31,  2017,  we  operated  using  74,396  kilometers  of  water  pipes  and  water
transmission lines and 50,991 kilometers of sewer lines.

We also provide water and/or sewage services to four other municipalities through special purpose companies.  In addition, we have three
partnerships  with  private  companies:    Aquapolo  Ambiental  S.A.,  Attend  Ambiental  S.A.  and  Paulista  Geradora  de  Energia  S.A.    Aquapolo
Ambiental S.A. commenced operations in the second half of 2012 and operates the largest water recycling facility in the southern hemisphere. 
Aquapolo Ambiental S.A. has the capacity to supply up to 1,000 liters per second to industries in the Capuava petrochemical cluster of the São
Paulo  metropolitan  region,  but  is  currently  providing  approximately  650  liters  per  second  as  a  result  of  demand.  Attend  Ambiental  S.A.
commenced  operations  in  the  second  half  of  2014  to  operate  a  pre-treatment  plant  for  non-domestic  effluent  in  the  São  Paulo  metropolitan
region.  Paulista Geradora de Energia S.A., which was formed in 2015, focuses on the implementation and commercial exploration of water
potential in small hydroelectric power plants, located at Vertedouro Cascata and the Guaraú Water Treatment Plant, with a total capacity of 7
MW.  We were planning to commence construction in the course of the second semester of 2017, but the current economic situation in Brazil
has reduced the availability of credit, and therefore the commencement of construction has been rescheduled for the second half of 2018. See
“Note  12  to  the  Financial  Statements  -  Investments”.    In  addition,  we  provide  consulting  services  regarding  the  rational  use  of  water,  the
updating  of  institutional  models,  and  commercial  and  operational  management  in  Panama,  through  a  consortium.    We  previously  provided
consulting services to Honduras and Nicaragua, but these consulting services have been completed.

The  State  of  São  Paulo,  our  controlling  shareholder,  is  required  by  State  Law  No.  11,454/2003  to  own  at  least  50%  plus  one  of  our
common shares.  As of May 24, 2018, the State owned 50.3% of our outstanding common shares.  As a mixed capital company, we are an
integral  part  of  the  State  governmental  structure.    Our  strategy  and  major  policy  decisions  are  formulated  in  conjunction  with  the  State
Secretariat for Sanitation and Water Resources as part of the State’s overall strategic planning.  The majority of the members of our board of
directors and our board of executive officers are nominated by the State government.

In addition, our capital expenditure budget is subject to approval by the State legislature and is approved in conjunction with the budget of
the State Secretariat for Sanitation and Water Resources as a whole.  Our financial statements and accounting records are subject to review by
the State Accounts Tribunal (Tribunal de Contas), as are all accounts of the State.

Our  results  of  operations  and  financial  condition  are  generally  affected  (i)  by  our  ability  to  raise  tariffs,  control  costs  and  improve
productivity; (ii) the general economic conditions in Brazil and abroad; and (iii) climate conditions.  In order to supply water to the São Paulo
metropolitan region, we use water from eight systems, most of which were affected by the most severe drought in our service region in over 80
years, which occurred during 2014 and 2015.  Of those, the Cantareira System, our largest water system, was the most affected. In order to
balance supply and demand despite the restricted water availability, we adopted throughout 2014 and 2015 a series of initiatives.  In March
2016, as a result of the increased level of rainfall and increased predictability of the level of water in our reservoirs, we cancelled the Water
Consumption  Reduction  Incentive  Program  and  the  Contingency  Tariff  to  water  meter  readings  recorded  as  of  May  1,  2016.  For  further
information on the water crisis, see “Item 3.D. Risk Factors—The measures we took to mitigate the effects of the drought that occurred in
2014  and  2015  resulted  in  a  significant  decrease  in  the  volume  of  water  billed  and  revenues  from  services  we  provide  and,  despite  the
discontinuation in May 2016 of the measures that were used to face the drought, new consumption habits were incorporated and the volume of
water billed continues to be impacted by those measures.” and  “Item 4.B Business Overview—The Recent Water Crisis”.

Our Strengths

We believe that our strong business position and future prospects derive from the following strengths:

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Well‑established business with significant size, scale and know‑how to operate in complex urban settings.  We believe we are one of the
largest water and sewage service providers in the world.  We provide water services directly to approximately 24.9 million people and supply
water  on  a  wholesale  basis  to  an  additional  urban  population  of  approximately  3.0 million  people.    As  of  December  31,  2017,  we  had  an
effective water coverage ratio of 98% in respect of all regions in which we operate.  We also provide sewage services directly to approximately
21.6 million people, achieving an effective sewage service ratio of 83% in respect of all regions in which we operate as of December 31, 2017. 
Our significant size and scale have required us to operate in complex urban settings such as shantytowns (favelas) and environments without
urban  planning,  thereby  enabling  us  to  develop  well‑trained  personnel,  skills  for  operating  in  adverse  conditions  that  we  believe  our
competitors lack.

Operations  in  Brazil’s  most  populous  and  wealthy  state.    The  state  of  São  Paulo,  which  is  located  in  the  most  developed  and
economically  active  region  of  Brazil,  is  the  most  populous  state  in  Brazil,  with  an  estimated  total  population  of  43.8  million  as  of
December  31,  2017.    The  city  of  São  Paulo  had  an  estimated  total  population  of  11.7  million  as  of  the  same  date,  while  the  São  Paulo
metropolitan region had a total population of 20.8 million.  Based on its GDP, the state of São Paulo is the wealthiest state and largest economy
in Brazil.  The GDP of the state of São Paulo was approximately R$1.7 trillion in 2015, representing approximately 26.3% of Brazil’s total
GDP, according to the most recent data collected by the IBGE. The state of São Paulo generates more revenue from water and sewage services
than any other Brazilian state.

Strong Base of Contracted Business.  Between January 1, 2007 and December 31, 2017, we executed 30-year agreements with 287 of the
368 municipalities we serve, including an agreement with the city of São Paulo, in June 2010, and Santos in September 2015.  For the year
ended December 31, 2017, income from these 30-year agreements accounted for 81.7% of our gross operating revenues (including revenues
relating to the construction of concession infrastructure).

Access to low‑cost and diverse sources of financing.  Our strong cash flow generation from operations and our role as an essential public
service  provider  places  us  in  a  privileged  position  in  our  industry  to  obtain  low  cost,  long‑term  financing  from  Brazilian  public  banks,  and
domestic and international multilateral agencies and development banks.  We do not depend on a limited number of sources of financing, but
instead have access to various funding alternatives in the Brazilian and international markets to fund our working capital needs and our capital
expenditure programs.

Strong corporate governance practices.  In 2002, we joined the Novo Mercado segment of the B3, which is the listing segment in Brazil
with  the  highest  corporate  governance  requirements.    As  a  result,  we  are  committed  to  certain  corporate  governance  standards  that  are  not
otherwise  required  by  Brazilian  law,  which  provides  heightened  protection  to  our  shareholders  and  enhances  the  quality  of  information  we
disclose to the market.  From December 2007 until December 2015, we were part of the B3 Corporate Sustainability Index, or ISE.  In 2016,
due  to  the  need  to  focus  the  attention  of  all  our  departments  on  overcoming  the  water  crisis,  we  decided  not  to  participate  in  the  selection
process to be a part of the ISE. As of the date of this annual report, we have not yet recommenced participation in this selection process.

High  quality  operations.    We  believe  that  we  adhere  to  high  standards  of  service  and  employ  the  best  available  technology  in  the
sanitation business to control the quality of the water we abstract, process and distribute.  Of our 16 laboratories in total, our central laboratory
and  13  of  our  regional  laboratories  are  accredited  by  the  National  Institute  of  Metrology,  Quality  and  Technology,  Standardization  and
Industrial Quality, or INMETRO, and comply with the ABNT NBR ISO IEC 17025 standard, thereby assuring the quality and accuracy of our
test results.  Moreover, our laboratories and field teams use the latest equipment to detect substances controlled by regulations and have highly
trained  teams  to  handle  contingencies  and  customer  complaints.    We  believe  our  technology  enhances  the  efficiency  and  quality  of  our
operations.

Our Strategy

Our mission is to provide water and sewage services, contributing to improvements in quality of life and the environment.  Our goal is to
become a global reference in the provision of basic sanitation services in a sustainable, competitive and innovative manner, focused on the
needs  of  our  clients.    To  this  end,  our  strategic  objectives  are  based  upon  the  guiding  principles  of  water  availability,  excellence  in  the
provision of services, sustainable growth, fostering and expanding our operating base, innovation and technology, motivation of personnel and
expansion of our sewage treatment coverage.

Secure water availability in the areas where we operate.  Our goal is to secure the availability of water in the areas where we operate, as
well  as  to  promote  a  rational  and  integrated  use  of  water  resources,  respecting  demand  and  critical  levels  of  water  for  each  region,  and
allocating resources in the short, medium and long run in order to guarantee access to water.  Our goal is to consistently meet the needs of our
consumers with our services. Furthermore, we have planned a series of short-term and medium-term measures that we believe will increase
the  ability  of  our  immediate  water  supply  to  cope  with  the  water  crisis  and  significantly  improve  future  water  security  by  the  end  of  the
decade.  For more information, see “Item 4.B. Business Overview—The Recent Water Crisis” and “—Capital Expenditure Program”.

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Ensure the quality and availability of our services in our existing service area through excellence in service provision and improving
our operating efficiency.  Our goal is to maintain the water coverage ratio, coupled with a high standard of quality and availability of our
services, and meet the expected growth in our operating basis.  We also intend to increase our sewage coverage by adding 1.1 million sewage
connections by 2022.  In addition, we seek to reduce both physical and non‑physical water loss.  See “—Capital Expenditure Program”.

We also seek to improve our processes by implementing:  (i) a new management model based on the Management Excellence Model of
the National Quality Foundation (Modelo de Excelência na Gestão da Fundação Nacional da Qualidade) that seeks to improve management
processes alignment and best practices sharing within the company; (ii) an enterprise resourcing planning system, or “ERP system” (SAP), and
a  customer  relationship  management  system,  or  “CRM  system”  (Net@suite),  to  replace  our  commercial  and  management  information
systems.  The ERP system was implemented in April 2017 and Net@suite is expected to be implemented in 2018.

These  projects  intend  to  increase  our  speed  and  productivity  in  responding  to  regulatory  changes;  to  strengthen  and  streamline  our
financial, commercial and administrative structure; to provide a solid and integral base of information to support the decision-making process;
and to increase the efficiency of our operations while also reducing costs. 

Continue to seek sustainable growth.  Our goal is to grow while balancing our economic and financial results with environmental and
social considerations, to secure positive financial results so as to guarantee investments for the provision of services, as well as to provide an
adequate and just remuneration for our shareholders.  We seek to act as citizens and to promote the well-being of the communities we operate
in and the protection of the environment.  We aim to apply our principles of financial growth and sustainability to each business unit, assigning
goals and setting clear responsibilities to each unit so as to strengthen our financial results.  To achieve this goal, we intend to use our best
efforts to reduce operating costs and increase productivity and profitability.  We plan to improve the management of our assets, as well as to
continue  to  reduce  our  total  operating  expenses  by  automating  some  of  our  facilities,  streamlining  operational  processes,  implementing
integrated planning and further investing in internal technological research and development. 

We also plan to continue our efforts to improve our collection of overdue accounts receivable from municipalities to which we provide
services, from the State and from other governmental entities, including by exploring opportunities to offset these outstanding debts against
certain possessory or property rights over utilities relating to water and sewage systems.  We intend to continue to fund our working capital
needs and estimated capital expenditure programs with diversified sources of financing, such as domestic and international development banks
and multilateral agencies.  We will continue to seek market opportunities for low‑cost financing and restructuring of our indebtedness if and
when advantageous and appropriate.

Since 2008, we have expanded into activities that complement water and sewage services in which we may leverage our know‑how, size,

scale and profitability.  These activities include consulting and management of sanitation systems.

Currently,  we  provide  water  and/or  sewage  services  to  four  other  municipalities  through  special  purpose  companies  and  have  three

partnerships with private companies.  See “Item 4.  Information on the Company—History and Development of the Company—Overview”.

Maintain and expand our operating base.  We intend to maintain and expand our operating base by executing new agreements.  To this
end,  we  are  actively  seeking  to  develop  closer  relationships  with  the  municipal  governments  that  we  currently  serve  in  order  to  increase
customer loyalty and thereby renew all or substantially all our concession agreements as they expire.  We also regularly explore the possibility
of executing agreements for the provision of water and sewage services in municipalities in the state of São Paulo in which we currently have
no operations or to which we currently supply water and provide sewage treatment solely on a wholesale basis, which together represent a total
population of approximately 16.5 million.  We evaluate possible expansion opportunities in terms of proximity to our existing service areas to
maximize return on investment and improve our financial performance.  In June 2010, we entered into a 30‑year agreement with the State and
city  of  São  Paulo  for  the  provision  of  water  and  sewage  services  in  the  city  of  São  Paulo,  which  in  the  year  ended  December  31,  2017
accounted for 50.1% of our gross operating revenues (excluding revenues relating to the construction of concession infrastructure).  Between
January 1, 2007 and December 31, 2017, we entered into agreements with 287 municipalities (including our services agreement with the city
of São Paulo), of which six were entered into in 2017.  These 287 municipalities accounted for 81.7% of our total revenues for the year ended
December 31, 2017 and 72.3% of our intangible assets as of the same date.  As of December 31, 2017, 51 of our concessions had expired and
are currently being renegotiated.  These 51 municipalities accounted for 10.3% of our total revenues for the year ended December 31, 2017
and 19.6% of our intangible assets as of the same date.  From January 1, 2018 through 2030, 32 concession agreements, accounting for 6.2%
of our revenues for the year ended December 31, 2017 and 5.7% of our intangible assets as of the same date, will expire.

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Seek opportunities to adopt and develop innovative technology.  We plan to stimulate the creation, adoption and diffusion of innovative
solutions  aiming  to  generate  value  and  to  improve  our  provision  of  basic  sanitation  services  while  promoting  environmental  protection  and
maintaining  our  competitiveness  and  profitability.    In  accordance  with  our  bylaws,  our  activities  comprise  water  supply,  sanitary  sewage
services,  urban  rainwater  management  and  drainage  services,  urban  cleaning  services,  solid  waste  management  services,  and  also  related
activities, including the planning, operation, maintenance and commercialization of energy, and the commercialization of services, products,
benefits  and  rights  that  directly  or  indirectly  arise  from  our  assets,  operations  and  activities.  We  are  also  authorized  to  carry  out  activities
through  subsidiaries  in  other  Brazilian  locations  and  in  other  countries.    See  Item  “5.C.  Research  and  Development,  Patents  and  Licenses,
Etc.” 

Establish efficient and competitive ways of motivating, retaining and attracting personnel.  We intend to provide our personnel with
programs  for  professional  and  personal  development,  growth  opportunities  and  recognition.    These  programs  include  competitive  benefit
packages  and  a  healthy  and  collaborative  work  environment.    We  seek  to  raise  workplace  satisfaction,  well-being,  engagement  and
productivity.

Expand our sewage treatment coverage.  Our goal is to progress in the implementation of sewage collection and treatment structures in
an economically and technologically viable way.  We had an effective sewage coverage ratio of 90% as of December 31, 2017 and plan to
increase this ratio to 93% by 2022 by adding over 1.1 million sewage connections and the indicator of consumer units connected to the sewage
treatment system from 75% to 83% by 2022.  These investments are necessary to restore the quality of the rivers and lakes, providing new
sources for water supply.  In addition, there are municipalities in the state of São Paulo representing a total population of approximately 16.5
million to which we currently do not provide water or sewage services, or to which we currently supply water solely on a wholesale basis.  Our
strong presence in the State and experience in providing water and sewage services places us in a privileged position to expand our sewage
services to these additional municipalities in the state of São Paulo as well as to other Brazilian states and abroad.  For more information, see
“Item 4.B. Business Overview—Description of our Activities—Sewage Operations” and “Item 4.B. Business Overview—Competition” and
“Item 4.B. Business Overview—Tariffs”.

Our strategic objectives also focus on our political and institutional relationships as well as on our commitment to the market to increase

shareholder value.

In 2017 we invested R$3.4 billion and between 2018 and 2022 we plan to invest an additional R$17.3 billion to improve and expand our
water and sewage systems, increase water security, and meet the growing demand for water and sewage services in the state of São Paulo,
thereby encouraging these customers to continue using our services. 

We believe that our overall strategy will enable us to meet the demand for high quality water and sewage services in the state of São Paulo
as well as in other Brazilian states and abroad, while creating shareholder value and strengthening our results of operations and our financial
condition.

State of São Paulo

The state of São Paulo is one of 26 states that, together with the Federal District of Brasília, constitute the Federative Republic of Brazil. 
The state of São Paulo is located in the southeastern region of the country, which also includes the States of Minas Gerais, Espírito Santo and
Rio  de  Janeiro,  and  which  is,  according  to  IBGE,  the  most  developed  and  economically  active  region  of  Brazil.    The  state  of  São  Paulo  is
located on the Atlantic coast of Brazil and is bordered by the states of Rio de Janeiro and Minas Gerais to the north, the state of Paraná to the
south and the state of Mato Grosso do Sul to the west.

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The  state  of  São  Paulo  occupies  approximately  3.0%  of  Brazil’s  land  mass  and  encompasses  an  area  amounting  to  approximately
96,000 square miles.  According to the SEADE, the state of São Paulo had an estimated total population of 43.8 million as of December 31,
2017.  The city of São Paulo, capital of the state of São Paulo, had an estimated total population of 11.7 million, with a total population of 20.8
million  inhabitants  in  the  São  Paulo  metropolitan  region,  as  of  December  31,  2017.    The  São  Paulo  metropolitan  region  encompasses  39
municipalities and is the largest metropolitan region in the Americas and the fifth largest metropolitan region in the world, according to the
United Nations’ Data Booklet “The World’s Cities in 2016”, with approximately 47% of the total population of the state of São Paulo as of
December 31, 2017. According to the most recent data collected by the IBGE, the GDP of the state of São Paulo was approximately R$1.7
trillion in 2015, representing approximately 26.3% of Brazil’s total GDP, and making it the largest economy of any state in Brazil based on
GDP. According to the IBGE, the state of São Paulo is also the leading Brazilian state in terms of manufacturing and industrial activity, with a
strong position in car manufacturing, pharmaceuticals, computer manufacturing, steel making and plastics, among other activities, as well as a
leading position in the banking and financial services industries.  The state of São Paulo is the leading export state in Brazil, according to the
Brazilian Ministry of Development, Industry and Foreign Trade (Ministério do Desenvolvimento, Indústria e Comércio Exterior).

History

Until  the  end  of  the  nineteenth  century,  water  and  sewage  services  in  the  state  of  São  Paulo  were  generally  provided  by  private
companies.  In 1875, the Province of São Paulo granted a concession for the provision of water and sewage services to Cantareira Water and
Sewage Company (Companhia Cantareira de Água e Esgotos).  In 1893, the government of the Province of São Paulo assumed responsibility
for  the  provision  of  water  and  sewage  services  from  Cantareira  Water  and  Sewage  Company  and  formed  the  Office  of  Water  and  Sewers
(Repartição de Água e Esgotos), a government agency.  Since that time, water and sewage services in the São Paulo metropolitan region have
been administered by the State government.  Historically, water and sewage services in substantially all other municipalities of the State were
administered  directly  by  the  municipalities,  either  by  municipal  water  and  sewage  departments  or  through  autarquias  of  the  municipal
government.  Autarquias are relatively autonomous public bodies with separate legal standing, assets and revenues, created by law to carry out
the  administration  of  public  services  where  the  government  deems  that  a  decentralized  administrative  and  financial  structure  would  be
advantageous.

In 1954, in response to dramatic population growth in the São Paulo metropolitan region, the State government created the Department of
Water and Sewers (Departamento de Águas e Esgotos) as an autarquia of the State.  The Department of Water and Sewers provided water and
sewage services to various municipalities in the São Paulo metropolitan region.

A major restructuring of the entities providing water and sewage services in the state of São Paulo occurred in 1968, with the creation of
the Water Company of the São Paulo metropolitan Region (Companhia Metropolitana de Água de São Paulo), or the “COMASP”, the purpose
of which was to provide potable water on a wholesale basis for public consumption in the various municipalities of the São Paulo metropolitan
region.  All assets relating to the production of potable water for the São Paulo metropolitan region previously owned by the Department of
Water and Sewers were transferred to COMASP.  In 1970, the State government created the Superintendence of Water and Sewers of the City
of São Paulo (Superintendência de Água e Esgoto da Capital), or the “SAEC”, to distribute water and collect sewage in the city of São Paulo. 
All assets relating to water services previously owned by the Department of Water and Sewers were transferred to the SAEC.  Also in 1970,
the  State  created  the  Basic  Sanitation  Company  of  the  São  Paulo  metropolitan  Region  (Companhia  Metropolitana  de  Saneamento  de  São
Paulo), or the SANESP, to provide sewage treatment services for the São Paulo metropolitan region.  All assets relating to sewage services
previously  owned  by  the  Department  of  Water  and  Sewers  were  transferred  to  the  SANESP.    The  Department  of  Water  and  Sewers  was
subsequently closed.

On June 29, 1973, pursuant to State Law No. 119/1973, COMASP, SAEC and SANESP merged to form our Company with the purpose of
implementing  the  directives  of  the  Brazilian  government  set  forth  in  the  National  Water  Supply  and  Sanitation  Plan  (Plano  Nacional  de
Saneamento).  We were incorporated under the laws of Brazil as a sociedade anônima for indefinite duration.  The National Water Supply and
Sanitation Plan was a program sponsored by the Brazilian government, which financed capital investments in, and assisted in the development
of, state‑controlled water and sewage companies.  Since our formation, other State governmental and State‑controlled companies involved in
water supply and sewage collection and treatment in the state of São Paulo have been merged into our company.  The State has always been
our  controlling  shareholder,  as  required  by  State  Law  No.  11,454/2003.    We  have  therefore  been  integrated  into  the  State  governmental
structure  and  our  strategies  have  been  formulated  in  conjunction  with  the  strategies  of  the  State  Department  of  Water  Resources  and
Sanitation.  Additionally, a majority of the members of our board of directors and our management are appointed by the State Government.

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Our capital expenditure budget is subject to approval by the State legislative chamber.  This approval is obtained simultaneously with the
approval of the budget of the São Paulo Secretariat for Sanitation and Water Resources (Secretaria  de  Saneamento  e  Recursos  Hídricos  do
Estado de São Paulo).  We are also subject to supervision from the Court of Audit of the State of São Paulo (Tribunal de Contas do Estado de
São Paulo), with regard to our accounting, financial and budgetary activities and our operating assets.

We provide water and sewage services directly to a large number of residential, commercial and industrial private consumers, as well as to
a  variety  of  public  entities,  in  368 of  the  645 municipalities  in  the  State,  including  in  the  city  of  São  Paulo.    We  also  supply  water  on  a
wholesale basis to five municipalities in the São Paulo metropolitan region in which we do not operate water distribution systems, and four of
these municipalities also utilize our sewage treatment services.  According to the inDepth Water Yearbook 2014-2015, we are the fourth largest
water and sewage service company in the world in terms of number of clients. 

In  1994,  we  were  registered  with  the  CVM  as  a  publicly-held  company  and  are  therefore  subject  to  the  CVM’s  rules,  including  those
relating to the periodic disclosure of extraordinary facts or relevant events.  Our common shares have been listed on the B3 under the ticker
“SBSP3” since June 4, 1997.

In 2002, we joined the Novo Mercado segment of the B3, which is the listing segment in Brazil with the highest corporate governance
requirements.  In the same year, we registered our common shares with the Securities and Exchange Commission, or SEC, and started trading
our shares in the form of ADR – level III on the New York Stock Exchange, or NYSE, under the ticker “SBS”.

In 2004, the State of São Paulo carried out a secondary offer of common shares of our company in the Brazilian and international markets.

State Law No. 12,292/2006 amended State Law No. 119/1973, which created our Company, and now authorizes us to provide water and
sewage services outside of the state of São Paulo, both to other states of Brazil and to other countries.  This law also authorizes us to own
interests in other public or private‑public companies and Brazilian or international consortia.  In addition, this law permits us to incorporate
subsidiaries  and  enter  into  a  partnership  with  or  acquire  interests  in  a  private  company  with  a  corporate  purpose  related  to  the  sanitation
business.  

In December 2007, Law No. 1,025/2007, which provided for the creation of regulatory agencies for the supervision of water and sewage

services, created ARSESP, the regulatory agency that regulates and supervises the services we provide.

In September 2017, the State of São Paulo obtained approval for State Law No. 16,525/2017, which authorizes the State of São Paulo to
set up a controlling company to hold all of the shares that the State of São Paulo holds in our company. Once formed, this controlling company
will  control  our  company,  pursuant  to  the  provisions  of  Art.  116  of  the  Brazilian  Corporate  Law.  State  Law  No.  16,525/2017  allows  other
minority shareholders, including private companies and state companies, to hold shares of the controlling company, provided that the State of
São Paulo holds the majority of the common shares of the controlling company. On March 9, 2018, the State of São Paulo received a letter
from  a  group  of  investors  expressing  interest  in  acquiring  shares  of  the  controlling  company.  This  letter  is  being  assessed  by  the  State
Privatization Program’s Board (Conselho Diretor do Programa Estadual de Desestatização - CDPED), which has authority over our corporate
reorganization,  including  the  formation  of  the  controlling  company.  The  transaction  proposed  in  the  letter  relates  only  to  shares  of  the
controlling company level and therefore would not affect the corporate control of our company, which will remain held by the State of São
Paulo.  The  identity  of  the  investors  and  the  content  of  the  letter  remain  confidential  in  accordance  with  the  rules  applicable  to  the
administrative procedure established by CDPED for the purposes of operation.

Corporate Organization

We currently have six management divisions, each of which is supervised by one of our executive officers.

Our  board  of  directors  allocates  responsibilities  to  our  executive  officers  following  an  initial  proposal  made  by  our  Chief  Executive
Officer, in accordance with our bylaws.  The Chief Executive Officer is responsible for coordinating all management divisions in accordance
with the policies and directives established by our shareholders’ meeting, our board of directors and board of executive officers, including the
coordination,  evaluation  and  control  of  all  functions  related  to  the  Chief  Executive  Officer’s  office  and  staff,  integrated  planning,  business
management and corporate organization, communication, audit, ombudsman and quality.  The Chief Executive Officer represents our company
before  third  parties  and  certain  powers  can  be  granted  to  attorneys‑in‑fact.    The  executive  officers  described  below  report  to  the  Chief
Executive Officer:

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·                the  Corporate  Management  Officer,  who  is  responsible  for  marketing  (commercial  processes),  human  resources  and  social

responsibility, legal affairs, information technology, asset management, supplies and contracts;

·       the Chief Financial Officer and Investor Relations Officer, who is responsible for financial planning, costs and tariffs, raising capital
and allocating financial resources to divisions of our company, conducting capital markets and other debt incurrence transactions and
managing debt levels, controller, accounting, corporate governance and investor relations;

·             the Technology, Enterprises and Environment Officer is responsible for environmental management, technological and operational
development,  quality  control  of  water  and  sewage,  the  development,  coordination  and  execution  of  special  investment  programs,
projects, research innovation and new business ventures; and

·        the Chief Operating Officer for the São Paulo metropolitan region Division and the Chief Operating Officer for the Regional Systems
Division,  who  are  responsible  for  managing  the  operation,  maintenance,  execution  of  planning  and  works  for  water  and  sewage
supply  systems  (including  for  the  services  that  we  provide  on  a  wholesale  basis),  sales  and  call  center  services,  and  have  overall
responsibility for the financial and operational performance of their divisions. The Chief Operating Officers are also responsible for
sanitation  advisory  services  to  independent  municipalities  and  for  mediation  and  negotiation  with  communities  and  local
governments, aimed at aligning our interests with the interests of our clients.

Capital Expenditure Program

Our capital expenditure program is designed to improve and expand our water and sewage system and to increase and protect our water
sources in order to sustain water security, meet the growing demand for water and sewage services in the state of São Paulo and improve the
overall environmental impact of our activities.  Our capital expenditure program has four specific goals with respect to the municipalities we
serve: 

                (I).            to continue to increase water security and meet demand growth for treated water;

              (II).            to expand the percentage of households connected to our sewage system; 

            (III).            to increase the treatment of sewage collected; and

            (IV).            to increase operating efficiency and reduce water loss.

We have budgeted investments in the total amount of R$17.3 billion from 2018 through 2022.  We invested R$3.4 billion, R$3.9 billion

and R$3.5 billion in 2017, 2016 and 2015, respectively.

The following table sets forth our planned capital expenditures for water and sewage infrastructure for the years indicated: 

Water

Sewage Collection

Sewage Treatment

Total 

2018

2019

1,445.7

1,200.2

254.4

2,900.3

1,519.8

1,459.6

394.2

3,373.6

Planned Capital Expenditures

2020
(in millions of reais)

2021

1,445.3

1,397.8

656.8

3,499.9

1,368.3

1,799.0

595.9

3,763.2

2022

Total

1,341.1

1,875.2

540.2

3,756.5

7,120.2 
7,731.8 
2,441.5 
17,293.5 

Our capital expenditure program from 2018 through 2022 will continue to focus on achieving our targets by making regular investments to
maintain  and  expand  our  infrastructure  and  to  reduce  water  loss  in  the  368  municipalities  we  served  as  of  December  31,  2017.  The  recent
drought has prompted a reduction in the volume of water billed, particularly in 2014 and 2015, and thus a reduction in revenue.  Due to the
drought and the need to prioritize construction to mitigate the effects of the water crisis and increase water security in the Metropolitan Region
of São Paulo, we were required to adjust our investment programs commencing in 2014.  These adjustments are expected to continue in 2018
due to the priority given since 2014 to emergency investments in water.

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Main Projects of Our Capital Expenditure Program

The following is a description of the main projects in our capital expenditure program.

Investments in Water – We have a series of ongoing and scheduled projects involving water production and distribution.  For the period

from 2018 through 2022, we plan to spend R$7.1 billion in water-related investments.  The main programs are: 

Metropolitan Water Program

Demand  for  our  water  services  has  grown  steadily  over  the  years  in  the  São  Paulo  metropolitan  region  and  has  at  times  exceeded  the
capacity of our water systems.  On account of the high demand, prior to September 1998, a portion of our customers in this region received
water  only  on  alternate  days  of  the  week.    We  refer  to  this  as  “water  rotation”.    In  order  to  address  this  situation,  we  implemented  the
Metropolitan Water Program (Programa Metropolitano de Água) to improve regular water supply to the entire São Paulo metropolitan region. 
This program terminated in 2000 and the water rotation measure was eliminated, but still we have maintained our investment plans for the
region. 

Since 2000, the Metropolitan Water Program has increased the production capacity in 8.1 m³/s, 5 m³/s of which can be attributed to the
Public Private Partnership, or “PPP”, conducted in the Alto do Tietê concluded in 2011, and 2.1 m³/s of which can be attributed to increased
production in Guarapiranga System, concluded in 2015.

Aiming to improve the provision of water to the São Paulo Metropolitan Region, in April 2018, we increased treated water production
capacity by approximately 6.4 m³/s by concluding construction and initiating pre-operation of the São Lourenço System. In addition, in March
2018,  we  began  transferring  water  from  the  Jaguari  reservoir  (part  of  the  Paraíba  do  Sul  Basin)  to  the  Atibainha  reservoir  (part  of  the  PCJ
River Basin). This interconnection adds 5.13 m³/s of water availability.

In 2017, we invested approximately R$460 million in the Metropolitan Water Program. 

Interconnection of Jaguari and Atibainha Reservoirs

In March 2018, we completed the interconnection of the Jaguari and Atibainha reservoirs, which is a strategic and priority works project
to guarantee secure access to water for the metropolitan region of São Paulo.  With contracted investments of R$555 million, this construction
allows for the transfer of an average 5.13 m³/s of water from the Jaguari reservoir of the Paraíba do Sul Basin to the Atibainha reservoir of the
Cantareira System, the largest system that provides water to the metropolitan region of São Paulo.  In the future, the transfer of water shall also
work in the opposite direction, from the Atibainha reservoir to the Jaguari reservoir, optimizing the reservation capacity of both reservoirs, and
benefitting the population of the Paraíba Valley.  The construction work on the interconnection began in February 2016 and was completed
during  March  2018.  In  March  2018,  we  also  began  transferring  water  from  the  Jaguari  reservoir  (part  of  the  Paraíba  do  Sul  Basin)  to  the
Atibainha reservoir (part of the PCJ River Basin).

São Lourenço Project 

The metropolitan region lacks water sources, which requires us to obtain water from increasingly distant sources.  In order to address this
situation, we developed, under a PPP contract, a new supply system called São Lourenço, which expands our production capacity by 6.4 m3/s
and  should  be  able  to  benefit  a  population  of  almost  2.0  million  people.    The  PPP  contract  was  executed  in  August  2013  and  construction
began in April 2014.  The project was undertaken by Sistema Produtor São Lourenço S.A., which is a special purpose company controlled by
the construction companies Camargo Corrêa Construtora S.A. and Andrade Gutierrez S.A.  The construction of the new system began in April
2014 and was completed in April 2018. Upon completion, pre-operation began. Camargo Corrêa Construtora S.A. and Andrade Gutierrez S.A.
sold their shares of Sistema Produtor São Lourenço S.A. to CGGC Construtora do Brasil Ltda., a Chinese-owned company. This transaction
was completed in May 2018.

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As  of  December  31,  2017,  the  estimated  amount  of  the  PPP  contract  was  R$6.0  billion  (including  R$2.2  billion  in  construction  and
maintenance and operation of the system).  After monetary adjustment, the contract amounts to approximately R$7.9 billion and has a 25-year
term, four years of which was dedicated to the construction, while the other 21 years will be dedicated to service delivery.  These services
include the operation and maintenance of the sludge treatment system of the water treatment plant and disposal of the waste thus generated;
electromechanic and civil maintenance of the untreated water pumping stations, of the water treatment plant and the untreated water pipeline;
preservation and cleaning, surveillance and property security.

Reversal of the Itapanhaú River

We plan to begin construction of a pumping system for the Itapanhaú River during the first half of 2018. This system is expected to have
the capacity to pump an average of 2 m3/s (maximum of 2.5 m3/s) of water to Biritiba-Mirim, part of the Alto Tietê system. The project aims
to  improve  water  security  in  the  São  Paulo  metropolitan  region  and  is  expected  to  directly  benefit  approximately  4.5  million  residents  that
receive  water  from  the  Alto  Tietê  system  as  well  as  indirectly  benefit  21  million  people  in  the  greater  São  Paulo  region  via  the  integrated
system. We expect to invest a total of R$91.7 million in this project.

Corporate Program for Reduction of Water Loss

The objective of the Corporate Program for Reduction of Water Loss (Programa Corporativo de Redução de Perdas de Água) is to reduce
water loss by efficiently integrating and expanding existing initiatives in our business units.  This program has a 12‑year term that began in
2009.  We anticipate total investments of approximately R$6.3 billion (current value) throughout the term of the program.  Funding for the
program will come from our own resources as well as from credit facilities provided by the Japan International Cooperation Agency, or JICA,
and BNDES. 

The program aims to reduce the rate of water loss from 436 liters per connection per day in December 2008 to 273 liters per connection
per day by 2020, which is equivalent to reducing the Water Billed Loss Index from 27.6% in December 2008 to 17.9% in 2020 and to reducing
the Water Metered Loss Index (based on measured consumption) from 34.1% in December 2008 to 29.0% in 2020.  In 2017, our water loss
measured 302 liters per connection per day, our Water Billed Loss Index was 20.1% and our Water Metered Loss Index averaged 30.7%.

Water Source Program

The Water Source Program (Programa Mananciais), created in 2009 and ended in 2017, consisted of various projects that focused on the
preservation and improvement of water sources in the São Paulo metropolitan region, especially in the Guarapiranga and Billings reservoirs. 
The program’s investments were directed mostly towards the creation of infrastructure to collect sewage and transport it to treatment plants in
order to reduce the discharge of effluent into water sources.  The program also included the protection of green spaces and the urbanization of
shantytowns (favelas) and was supported by the federal government, the state of São Paulo, the municipality of São Paulo, the World Bank,
and us.  In 2017, R$20.6 million was invested in the Water Source Program.

Coastal Water Program

The Coastal Water Program (Programa Água no Litoral) combines various long‑term activities to expand water production capacity in the
Baixada  Santista  metropolitan  region  and  the  southern  coast  of  the  state  of  São  Paulo.    The  program  aims  to  benefit  approximately
three  million  people,  including  both  the  local  population  and  tourists.    It  aims  to  increase  the  level  of  reliability  of  the  local  systems,
eliminating existing and potential deficiencies and irregularities in the water supply.  Through this program we aim to increase the availability
of treated water and improve the quality of water available to the population.  The fund will come from our own funds and financing from
Caixa Econômica Federal.

During the first phase of this program, we have focused mainly on increasing water production in order to satisfy demand and improve
water  quality  in  the  Baixada  Santista  metropolitan  region.    In  order  to  reach  this  goal,  we  built  two  water  treatment  plants,  which  started
operations in 2013:  Mambu/Branco, with water treatment capacity of 1.6 m³/s, and Jurubatuba, with water treatment capacity of 2 m³/s. We
have also begun constructing two additional water treatment plants in the municipality of Peruíbe.

In 2016, the integrated system of the Baixada Santista metropolitan region was reinforced with the commencement of operations at the
Melvi  Treated  Water  Reserve  Center,  located  in  Praia  Grande.    The  Center’s  reserves  went  from  20  million  to  45  million  liters.  The
infrastructure is part of the Mambu-Branco production center (inaugurated in 2013 in Itanhaém) and will serve residents and tourists in two
municipalities  of  the  Baixada  Santista  region  (Praia  Grande  and  São  Vicente).    In  2017,  we  invested  R$22.6 million  in  the  Coastal  Water
Program. 

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Investments in Sewage—We have a series of ongoing and scheduled projects involving the collection, removal and treatment of sewage.

 For the period from 2018 through 2022, we plan to invest R$10.2 billion in sewage.  The main programs are:

Tietê Project

The Tietê river crosses the São Paulo metropolitan region and receives most of the region’s run‑off and wastewater.  The environmental
status  of  the  river  reached  a  critical  level  in  1992.    In  an  effort  to  reverse  the  situation,  the  State  of  São  Paulo  created  a  recovery  program
designed to contribute to the progressive revitalization of the Tietê river by installing sewage collection lines along the banks of the Tietê river
and its tributaries.  These lines collect raw sewage and deliver it to our sewage treatment facilities. 

We carried out the first phase of the program between 1992 and 1998, when we completed the construction of three additional sewage
treatment facilities.  This involved total investment of US$1.1 billion financed by the Inter‑American Development Bank, or “IADB”, Caixa
Econômica Federal and us.

The second phase of the project, which was carried out from 2000 through 2008, continued to expand and optimize the sewage system in
the  São  Paulo  metropolitan  region,  focusing  primarily  on  improvements  to  expand  the  delivery  of  raw  sewage  to  the  sewage  treatment
facilities  that  were  built  in  the  first  phase.    Upon  the  conclusion  of  the  second  phase  of  the  project  in  2008,  we  were  able  to  collect
approximately 5,000 liters of raw sewage per second and send it to the five sewage treatment plants in our integrated system for treatment.
  Total  investments  in  this  phase  amounted  to  approximately  US$500  million,  financed  by  the  IADB,  and  the  Banco  Nacional  de
Desenvolvimento Econômico e Social, or BNDES, and us.

The  first  and  second  phases  of  the  Tietê  Project  contributed  to  an  increase  from  70.0%  to  84.0%  in  the  sewage  collection  rate  and  an
increase from 24.0% to 70.0% in the treatment of sewage collected in the São Paulo metropolitan region.  As a result, the sewage collection
system covered a total of 15.8 million people (5.1 million more than the number of people served when the Tietê Project was initiated), and the
sewage  treatment  system  covered  11.1  million  people  (8.5  million  more  than  the  number  of  people  served  when  the  Tietê  Project  was
initiated). 

The third phase of the Tietê Project, initiated in 2010, aims to expand collection levels to 87.0% and sewage treatment levels to 84.0% in
the São Paulo metropolitan region.  The total estimated cost of the third phase is approximately US$2 billion, financed by the IADB, BNDES,
Caixa Econômica Federal, and us.

The  five  principal  sewage  treatment  facilities  in  the  São  Paulo  metropolitan  region  have  an  aggregate  installed  capacity  of  20.5  cubic
meters of sewage per second and currently treat an aggregate of 18 cubic meters of sewage per second (13.5 m3/s  greater  than  the  volume
treated at the start of the Tietê Project).

Following completion of the third phase of the Tietê Project, the sewage treatment system will serve an additional 5 million people. 

Continuing  our  efforts  to  amplify  and  optimize  the  sewage  system  of  the  São  Paulo  metropolitan  region  near  the  areas  we  serve,  thus
contributing to the progressive revitalization of the Tietê river, we have structured the fourth phase of the Tietê Project.  The total estimated
cost of this phase is approximately US$2 billion.

We continued to work on items from the third phase and began in 2014 to implement measures related to the fourth phase. In 2017, we

invested approximately R$411.1 million in this project.

Due to the drought and the need to prioritize construction to mitigate the effects of the water crisis and increase water security in the São

Paulo Metropolitan Region, we have reduced the volume of investment in this program.

Clean Stream Program

The Clean Stream Program (Programa Córrego Limpo), an agreement between the State, acting through our company, and the city of São
Paulo, aims to decontaminate urban streams in the city of São Paulo by eliminating the discharge of sewage into streams and rainwater runoff
routes, cleaning streams and banks, and removing and relocating low‑income households located on the banks of streams.  

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Since  2007,  151  urban  streams  have  been  decontaminated,  benefiting  approximately  2.5 million  people.    In  2017,  we  invested  R$7.8
million in the Clean Stream Program.  The program is supported by funds from the Caixa Econômica Federal as well as our own funds.  Part
of the investment related to the Tietê Project benefits the Clean Stream Program. 

In 2017, the actions of the Clean Stream Program allowed for the cleaning of two important streams in the city of São Paulo, Uberaba and
M’Boi Mirim, benefiting approximately 270 thousand people. During the year, we also continued to inspect and monitor the water quality of
streams that were previously decontaminated. 

However, despite our constant monitoring of pollution levels, the municipality of São Paulo’s difficulties in moving low-income families
who live in risky areas has led to a slowdown in progress under the program. We have renewed the partnership with the municipality and are
currently defining objectives for 2018.

Clean Wave Program

The main goals of the Clean Wave Program (Programa Onda Limpa) are to improve and expand the sewage systems in the municipalities
comprising  the  Baixada  Santista  metropolitan  region  on  the  southern  coast  of  the  state,  increasing  the  sewage  collection  rate  to  90%  and
treating 100% of this collected sewage, thereby improving the bathing water quality at 82 beaches in the region by the end of the decade.  This
project is being carried out in three phases, the first of which has already begun and the second and third of which are in the planning phase. 
The first phase, which increased the sewage collection rate to 77%, was completed in 2017. The funds came from our own resources as well as
from loan agreements entered into with JICA and from BNDES.

In 2017, we invested R$71 million in the Clean Wave Program.  As a result of our investments, sewage collection in the Baixada Santista
metropolitan region increased since the beginning of the program has increased from 53% in 2007 to 77% in 2017.  All of the sewage that was
collected was also treated.  Towards the goal of increasing sewage collection, and given that we have already installed sewage networks, we
are  now  prioritizing  strengthening  the  connection  of  our  customers  to  the  sewage  network.   As  of  December  31,  2017,  we  had  completed
approximately 110 thousand sewage connections. 

Under the program’s second phase, we plan to execute the expansion and renovation of two Oceanic Sewage Disposal System in the city

of Praia Grande, located in the Baixada Santista metropolitan region. This phase aims to enlarge and implement sewage collection and
treatment systems and complete 47 thousand new connections. It is expected to be concluded by 2021.

Finally,  the  third  phase  of  the  Clean  Wave  Program  will  aim  to  universalize  sewage  collection  and  treatment  services.  This  phase  is
planned to occur between 2026 and 2030, and will benefit areas where the population is expanding. Together, the second and third phases will
invest approximately R$1.8 billion in Baixada Santista metropolitan region.

Other Policies and Programs

Nossa Guarapiranga

In  December  2011,  we  launched  the  Nossa  Guarapiranga  project,  the  main  objective  of  which  is  to  improve  the  water  quality  in  the
Guarapiranga basin, an urban water source for the São Paulo metropolitan region.  The basin serves one million people directly in the areas
near Guarapiranga and indirectly serves a further three million people who consume the water from the basin.  We carried out actions on three
fronts  as  part  of  this  project:  (i)  we  installed  ecobarriers  at  the  bottom  of  the  reservoir’s  main  affluents  in  order  to  retain  solid  residue  and
installed drains to collect residue from rivers in the Guarapiranga basin; (ii) we developed diagnosis and control services for the removal of
plants that obstruct water extraction; and (iii) we removed and disposed of solid residue that had accumulated at the bottom of the dam in the
river  basin.   Two  vessels  were  built  specifically  for  this  purpose.   We  work  as  a  collaborative  team  with  the  municipal  government  of  São
Paulo in the Nossa Guarapiranga project, with the municipal government of São Paulo transporting all of the residue collected through these
fronts to a sanitary landfill. In 2017, we removed 17,700 m³ of solid residue from this basin.

Pró‑Conexão

In  2012,  the State  of  São  Paulo  approved  a  project  to  subsidize  connections  to  the  sewage  system  for  low‑income  families.    Initially
intended to last eight years, the project involves capital expenditures of up to R$349.5 million of which 80% will be provided by the State
government  and  20%  by  us.    In  this  period  we  expect  that  this  program  will  create  192  thousand  new  sewage  connections  benefiting
approximately 800 thousand people. As of December 2017, we completed approximately 23.5 thousand sewage  connections  under  the  Pró-
Conexão program. 

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We believe that this program will increase the efficiency of our other sewage collection programs and help improve water quality in the
region’s rivers and basins as well as improve quality of life for low‑income families.  For more information see “Item 7.B. Major Shareholders
and Related Party transactions—Related Party transactions—Agreements with the State.”

A large part of this work was executed by our own personnel, which considerably reduced the need for investment.

B.      Business Overview

Our Operations

As  of  December  31,  2017,  we  provided  water  and  sewage  services  to  368  municipalities  in  the  state  of  São  Paulo  under  concession
agreements,  program  agreements,  other  forms  of  legal  arrangements  or  without  formal  agreements.    We  also  supply  treated  water  on  a
wholesale basis to five municipalities located in the São Paulo metropolitan region and urban conurbations.  The majority of these concessions
have 30‑year terms.  Due to court orders, we temporarily suspended our services in two other municipalities (Cajobi e Macatuba).  For more
information,  see  “Item  8.A.  Financial  Statements  and  Other  Financial  Information—Legal  Proceedings”.  Between  January  1,  2007  and
December  31,  2017,  we  entered  into  agreements  with  287  municipalities  (including  our  services  agreement  with  the  city  of  São  Paulo)  in
accordance  with  the  Basic  Sanitation  Law,  of  which  six  were  entered  into  in  2017.    As  of  December  31,  2017,  these  287  municipalities
accounted for 81.7% of our gross operating revenues (including revenues relating to the construction of concession infrastructure).  In addition
to  the  contracts  that  have  30‑year  terms,  the  municipalities  entered  into  cooperation  contracts  with  the  State  of  São  Paulo,  delegating  the
regulation  and  monitoring  of  the  provision  of  services  to  ARSESP.    As  of  December  31,  2017,  51  of  our  agreements  or  concessions  had
expired but we continued to provide water and sewage services to these municipalities and were in negotiations with these municipalities to
execute program agreements to substitute the expired concessions.  From January 1, 2018 through 2030, 32 concessions will expire.

For  more  information  on  laws  and  regulations  related  to  our  concession  operations,  see  “—Government  Regulations  Applicable  to  our

Contracts”.

Description of Our Activities

As set forth in Article 2 of our bylaws, we are permitted to render basic sanitation services with the goal of providing basic sanitation
services to the entire population in the municipalities where we conduct our activities without harming our long‑term financial sustainability. 
Our activities comprise water supply, sanitary sewage services, urban rainwater management and drainage services, urban cleaning services,
solid waste management services and related activities, including the planning, operation, maintenance and commercialization of energy, and
the commercialization of services, products, benefits and rights that directly or indirectly arise from our assets, operations and activities.  We
are allowed to act in a subsidiary form in other Brazilian locations and abroad.  See “—Government Regulations Applicable to Our Contracts
—Establishment of ARSESP”.  For a description of our operating segments please see Note 24 to our financial statements as of and for the
year ended December 31, 2017.

Operating segments are presented in our annual report in a manner consistent with the internal reporting provided to our chief operating
decision maker, which is the board of directors and the board of executive officers, pursuant to how that is determined under IFRS 8.  Under
Brazilian  GAAP,  prior  to  our  conversion  to  IFRS,  the  financial  information  for  construction  services  was  not  separately  presented  and
construction  costs  related  to  concessions  were  capitalized  within  property,  plant  and  equipment.    As  a  result,  our  chief  operating  decision
maker did not review the results of this business.  Following our conversion to IFRS, our chief operating decision maker decided to continue to
exclude the construction results from the internal reporting of our revenues and expenses, thus not basing their decisions on discrete financial
information  for  that  business.    Consequently,  the  business  did  not  qualify  as  an  operating  segment  under  IFRS  8.    Nonetheless,  after  our
conversion to IFRS and for IFRS financial statement purposes only, we started to record such results separately as construction revenue and
costs under IFRIC 12.  Although such information is available discretely, however, it is not analyzed by our chief operating decision maker as
such and is not the basis for operational decisions.

We set forth below a description of our activities.

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Wholesale Operations

Wholesale Water Services

We  provide  water  services  on  a  wholesale  basis  to  five municipalities  located  in  the  São  Paulo  metropolitan  region  (Guarulhos,  Mauá,
Mogi das Cruzes, Santo André and São Caetano do Sul).  Agreements to provide water services on a wholesale basis must comply with the
Basic Sanitation Law, which designates these services as “interdependent activities” and regulates each stage of the service.  The law requires
that the service be supervised by an independent agency, stipulates registration of the cost of the service, and requires assurance of payment
among  the  several  service  providers  in  order  to  continue  the  provision  of  the  services,  in  accordance  with  the  rules  to  be  published  by
ARSESP.  Our agreements currently comply with the provisions of the Basic Sanitation Law. In 2017, the revenues from wholesales water
services were R$ 277.7 million. 

The  Brazilian  courts  are  entitled  to  obligate  us  to  continue  to  supply  water  to  these  municipalities,  even  when  we  have  not  received
payments due to us.  If they do not pay, we have no way of ensuring that negotiations with these municipalities or legal action taken against
them will result in payments being made.  For example, the municipalities of Santo André, Guarulhos and Mauá owe us significant sums in
respect  of  water  that  we  have  been  providing  to  them  on  a  wholesale  basis.      For  more  information,  see  “Item  3.D.  Risk  Factors—Risks
Relating to Our Business—We may face difficulties in collecting overdue amounts owed to us by municipalities to which we provide water on
a wholesale basis and municipal government entities”.  We have intensified the process of collecting these sums and other amounts using the
Single  Registry  of  Debtors  of  São  Paulo  (Cadastro  Único  de  Devedores  de  São  Paulo),  or  State  CADIN,  and  we  executed  Protocols  of
Intentions with Santo André, Guarulhos and Mauá in late 2015 and early 2016 seeking to resolve the outstanding amounts and restore normal
commercial relations with them. The negotiations with Mauá and Santo André broke down in June 2016, and the Protocol of Intentions was
terminated.  The  negotiations  with  Guarulhos  also  ended  in  August  2016,  but  we  executed  a  new  Protocol  of  Intentions  with  Guarulhos  on
April  10,  2017,  or  SAAE,  and  with  Santo  André  on  May  11,  2017,  both  with  the  same  aim  as  the  Protocols  of  Intentions  previously
terminated. 

In  August  2017,  we  announced  that  Guarulhos  and  us  decided  to  move  forward  with  the  development  of:  (i)  a  judicial  agreement  for
SAAE to pay the debt in installments, and (ii) an interdependence agreement, under which we provide the municipality of Guarulhos’ water
supply on a wholesale basis.  The main terms of these developments are:

I.            Judicial agreement for SAAE to pay the debt owed to us in installments:

a)       Payment of the existing debt of R$2.9 billion in 480 monthly installments, bearing interest of 0.5% per month and correction by

the IPCA index; and

b)       30% discount on the R$2.9 billion of debt owed by the municipality of Guarulhos to our company in connection to payment during

the installment period.

II.            Interdependence agreement for the supply of water by us on a wholesale basis:

a)       Establishment of a guarantee in favor of our company, through the fiduciary assignment of SAAE’s receivables, with automatic

segregation of amounts owed to us by the bank that centralizes SAAE’s collection; and

b)       A 20% discount on the monthly amount billed for the services of water supply on a wholesale basis, as a result of the

establishment of the guarantee and the automatic payment.

We are currently negotiating the terms of these agreements and we cannot guarantee when and if definitive agreements will be signed. In

2017, the municipality of Guarulhos paid around 80% of its monthly bills on time.

With respect to the municipality of Santo André, we signed a protocol of intention on May 11, 2017 and since then we have been working
with the municipality of Santo André on the preparation of studies and evaluations aimed at balancing commercial relations and debts existing
between the municipality and our company.

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With respect to the municipality of Mauá, on April 19, 2018 we published a press release stating that we have been in contact with the
municipality  of  Mauá  regarding  directly  supplying  water  to  four  neighborhoods  that  have  been  affected  by  a  water  shortage,  and  that  will
initiate formal discussions to engage in negotiations with the municipality.

Wholesale Sewage Services

Currently,  we  provide  sewage  services  on  a  wholesale  basis  to  the  municipalities  of  Mauá,  Mogi  das  Cruzes,  Santo  André  and  São
Caetano do Sul.  Our agreement with Santo André for these services was executed with the intervention of the Public Prosecution Office.  Our
agreements  with  the  other  municipalities  resulted  from  our  environmental  efforts  and  municipal  authorities’  awareness  of  environmental
issues.    Through  these  agreements,  in  2017  we  treated  approximately  42.8 million  cubic  meters  of  sewage  from  these  municipalities.    We
believe this illustrates our commitment to social and environmental responsibility.  In 2017, our revenues from wholesale sewage services were
R$35.1 million.

In December 2008, we entered into a five‑year agreement for the collection and treatment of 20% of the sewage generated by the city of
Guarulhos.    We  have  not  yet  started  to  provide  these  services,  and  they  will  only  be  able  to  commence  when  the  construction  projects  on
linking the Guarulhos sewage to our sewage system are finalized. These construction projects are the responsibility of the Guarulhos sanitation
company, which as of December 31, 2017 had not yet carried out the necessary construction projects.

Water Operations

Our supply of water to our customers generally involves abstraction of water from various sources, subsequent treatment and distribution
to our customers’ premises.  In 2017, we produced approximately 2,783.2 million of cubic meters of water.  The São Paulo metropolitan region
(including  the  municipalities  to  which  we  supply  water  on  a  wholesale  basis)  currently  is,  and  has  historically  been,  our  core  market,
accounting for approximately 69.0% of water invoiced by volume in 2017.

The following table sets forth the volume of water that we produced and invoiced for the periods indicated: 

Produced:
São Paulo metropolitan region
Regional Systems
Total 

Invoiced:
São Paulo metropolitan region
Wholesale
Regional Systems
Total 

2017

Year ended December 31,
2016
(in millions of cubic meters)

2015

1,952.3
830.9
2,783.2

1,175.8
256.7
643.4
2,075.9

1,888.8
807.4
2,696.2

1,136.7
227.4
626.2
1,990.3

1,679.4
787.2
2,466.6

1,084.3
215.5
613.9
1,913.7

The  difference  between  the  volume  of  water  produced  and  the  volume  of  water  invoiced  generally  represents  both  physical  and

non‑physical water loss.  See “—Water Loss”.  In addition, we do not invoice: 

·        water discharged for periodic maintenance of water transmission lines and water storage tanks;

·        water supplied for municipal uses such as firefighting;

·        water consumed in our own facilities; and

·        estimated water loss associated with water we supply to shantytowns (favelas).

Seasonality

Although seasonality does not affect our results in a significant way, in general, higher water demand is observed during the summer and
lower water demand during the winter.  The summer coincides with the rainy season, while the winter corresponds to the dry season.  The
demand in the coastal region is increased by tourism, with the greatest demand occurring during the Brazilian summer holiday months.

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Water Resources

We can abstract water only to the extent permitted by DAEE pursuant to water right granted by it.  Depending on the geographic location
of the river basin or if the river crosses more than one state (federal domain),  the approval of ANA a federal agency under the Ministry of the
Environment  is  required.    We  currently  abstract  substantially  all  of  our  water  supply  from  rivers  and  reservoirs,  with  a  small  portion  being
abstracted from groundwater.  Our reservoirs are filled by impounding water from rivers and streams, by diverting the flow from nearby rivers,
or by a combination of both methods.  For more information on water usage regulation, see “—Environmental Matters—Water Usage”.

In order to supply water to the São Paulo metropolitan region, we rely on 20 reservoirs of non‑treated water and 226 reservoirs of treated
water, which are located in the areas under the influence of the eight water producing systems comprising the interconnected water system of
the São Paulo metropolitan region.  The total capacity of the water sources available for treatment in this area is 75.9 m³/s, not including an
additional 5.5 m³/s resulting from the emergency construction work conducted by us in 2014 and 2015. Total current installed capacity is 75.8
m³/s and can be distributed to the São Paulo metropolitan region.  Average verified production for the interconnected water system of the São
Paulo metropolitan region was 60.6 m³/s during 2017.  The Cantareira, Guarapiranga and Alto Tietê systems produce 82.7% of the water we
distributed in the São Paulo metropolitan region in 2017.

In March 2018, we began operations on one important project for the interconnected water system of the São Paulo metropolitan region
with the beginning of the transfer of water from the Jaguari reservoir to the Atibainha reservoir. The interconnection between the Jaguari and
Atibainha reservoirs will have an average flow of 5.13m3/s and represents an important increase in water security for the Cantareira System
and for the water supply in the São Paulo metropolitan area. For more information see “—Capital Expenditure Program—Main Projects of Our
Capital Expenditure Program—Interconnection of Jaguarí and Atibainha Reservoirs”.

The construction of the São Lourenço Production System, another important project for the interconnected water system of the São Paulo
metropolitan region, began in April 2014 and was completed in April 2018. Upon completion in April 2018, pre-operation began. The São
Lourenço Production System represents an increase of 6.4m3/s in water availability and production capacity of the region’s integrated system
and is the ninth interconnected production system for the Metropolitan Region. For more information see “—Capital Expenditure Program—
Main Projects of Our Capital Expenditure Program—São Lourenço Project”.

In  2017,  the  Cantareira  system  accounted  for  41.3%  of  the  water  that  we  supplied  to  the  São  Paulo  metropolitan  region  (including  the
municipalities  to  which  we  supplied  water  on  a  wholesale  basis),  which  represented  70.7%  of  our  gross  operating  revenues  (excluding
revenues  relating  to  the  construction  of  concession  infrastructure)  for  the  year.    For  more  information,  see  “Item  3.D.  Risk  Factors—Risks
Relating to Our Business—We are exposed to risks associated with the provision of water and sewage services”.

Current  river  basin  committees  are  authorized  to  charge  both  for  water  usage  and  the  dumping  of  sewage  into  water  bodies.    We
participate in the decentralized and integrated management of water resources established by the National Policy on Water Resources.  We are
represented by 159 employees on the State River Basin Committees and the Federal Committees that act in the state of São Paulo and in the
National and State Councils on Water Resources. 

The following table sets forth the water production systems from which we produce water for the São Paulo metropolitan region: 

Water production system:
Cantareira
Guarapiranga
Alto Tietê
Rio Claro
Rio Grande (Billings reservoir)
Alto Cotia
Baixo Cotia
Ribeirão da Estiva
Total 

(1)     Average of the twelve months ended December 31, 2017, 2016 and 2015.

40

2017

Production Rate(1)
2016
(in cubic meters per second)

2015

25.0
13.3
11.8
3.9
4.5
1.2
0.8
0.1
60.6

22.0
13.9
11.7
3.8
4.9
1.2
0.9
0.1
58.5

14.1
14.9
12.1
3.9
5.0
0.9
1.0
0.1
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The Guarapiranga and Billings reservoirs and a portion of some of the reservoirs of the Alto Tietê system are owned by other companies
controlled by the State.  In the cities of the interior region of São Paulo, our principal source of water consists of surface water from nearby
rivers and from wells.  For additional information on the Alto Tietê system, see “Item 7.B. Related Party Transactions—Transactions with the
State of São Paulo—Agreements with the State”. 

Statewide,  we  estimate  that  we  are  able  to  supply  nearly  all  of  the  demand  for  water  in  all  of  the  areas  where  we  operate,  subject  to
droughts  and  extraordinary  climate  events.    We  installed  207.3, 200.2  and  226.0  thousand new  water  connections  in  2017,  2016  and  2015,
respectively. The interconnected water system of the São Paulo metropolitan region serves 30 municipalities, of which 25 are operated directly
by  us  under  this  system.    Through  this  system,  we  serve  the  other  five  municipalities  on  a  wholesale  basis,  whereas  distribution  is  the
responsibility of other companies or departments related to each municipality.

In order to reach the final customer, the water is stored and transported through a complex and interconnected system.  This water system

requires permanent operational supervision, engineering inspection, maintenance, and quality monitoring and measurement control.

To ensure the continuous provision of regular water supply in the São Paulo metropolitan region, we intend to invest R$7.1 billion from
2018 to 2022 to increase our water production and distribution capacities as well as to improve the water supply systems.  In 2017, our total
investment in water supply systems amounted to R$2.2 billion, of which R$1.8 billion were invested in the São Paulo metropolitan region.

Water Treatment

We  treat  all  water  at  our  water  treatment  facilities  prior  to  dispatching  it  to  our  water  distribution  network.    We  operate  240  treatment
facilities,  of  which  eight  are  a  part  of  the  Metropolitan  Production  System—located  in  the  São  Paulo  metropolitan  region  and  account  for
approximately 70.2% of all water we produced in 2017.  The type of treatment used depends on the nature of the source and quality of the
untreated water.  For example, water abstracted from rivers requires more treatment than water drawn from groundwater sources requires.  All
of the water we treat receives fluoridation treatment.

Water Distribution

We  distribute  water  through  our  own  networks  of  water  pipes  and  water  transmission  lines,  ranging  in  size  from  2.5  meters  to
75  millimeters  in  diameter.    Storage  tanks  and  pumping  stations  regulate  the  volume  of  water  flowing  through  the  networks  in  order  to
maintain adequate pressure and continuous water supply. 

The following table sets forth the total number of kilometers of water pipes and water transmission lines and the number of connections in

our network as of the dates indicated:

Water distribution pipes and water transmission lines (in kilometers)
Number of connections (in thousands)

As of December 31,
2016

2017

2015

74,396
8,863

73,015
8,654

71,705
8,420

More  than  90%  of  the  water  pipes  in  our  water  distribution  network  are  made  of  cast  iron  or  polyvinylchloride,  or  PVC.    Distribution
pipes at customers’ residences typically are made from high‑density polyethylene tubing.  Our water transmission lines are mostly made of
steel, cast iron or concrete.

As  of  December  31,  2017,  our  water  distribution  pipes  and  water  transmission  lines  included:    (i)  38,221  kilometers  in  the  São  Paulo

metropolitan region; and (ii) 36,174 kilometers in the Regional Systems.

As of that date, we had 408 storage tanks in the São Paulo metropolitan region with a total capacity of 2.2 million cubic meters, and 2,031
storage  tanks  in  the  Regional  Systems.    Furthermore,  we  had  462  treated  water  pumping  stations  in  the  São  Paulo  metropolitan  region
aqueduct system, including stations at treatment facilities, intermediate trunk transfer pumping stations and small booster stations serving local
areas.

Water  transmission  lines  that  require  maintenance  are  cleaned  and  their  lining  is  replaced.    We  are  typically  notified  of  water  main
fractures  or  breaks  by  the  public  through  a  toll‑free  number  maintained  by  us.    We  consider  the  condition  of  the  water  pipes  and  water
transmission lines in the São Paulo metropolitan region to be adequate as of the date of this annual report.  Due to age, external factors such as
traffic,  the  dense  population,  and  commercial  and  industrial  development,  water  pipes  and  water  transmission  lines  in  the  São  Paulo
metropolitan region are somewhat more susceptible to degradation than those in the Regional Systems.  To counter these effects, we have a
maintenance program in place for water pipes and water transmission lines that is intended to address anticipated fractures and clogs due to
brittleness and encrustation, and to help ensure water quality in the region. 

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The new customers whose water pipes are more than 20 meters away from the water transmission lines are responsible for covering part
of  the  costs  of  connecting  to  our  water  distribution  network.    They  must  cover  the  costs  of  connecting  to  the  network  from  the  customer’s
premises, including costs of purchasing and installing the water meter and related labor costs.  We perform the installation of the water meter
and conduct periodical inspections and measurements.  After completion of installation, the customer is responsible for the water meter.

The following table sets forth projected new water connections for the periods indicated in thousands: 

São Paulo metropolitan region
Regional Systems
Total 

Water Loss

in thousands

2018

2019

2020

2021

2022

2018 – 2022

105
63
168

98
62
160

97
58
155

95
55
150

95
55
150

490
293
783

The  difference  between  the  volume  of  water  produced  and  the  volume  of  water  invoiced  generally  represents  both  physical  and

non‑physical water loss. 

The Water Billed Loss Index represents the quotient of (i) the difference between (a) the total volume of water produced minus (b) the
total volume of water invoiced plus (c) the volume of water excluded from our calculation of water loss, divided by (ii) the total volume of
water produced. 

The Water Metered Loss Index represents the quotient of (i) the difference between (a) the total volume of water produced minus (b) the
total volume of water measured minus (c) the volume of water that we exclude from our calculation of water loss, divided by (ii) the total
volume of water produced.

The Water Loss per Connection per day measured in liters per connection per day represents the quotient of (i) the average annual water
loss, divided by (ii) the average number of active water connections multiplied by the number of days of the year.  This calculation method is
based on worldwide market practice for the sector.

We exclude the following from our calculation of water loss:  (i) water discharged for periodic maintenance of water transmission lines
and water storage tanks; (ii) water supplied for municipal uses such as firefighting; (iii) water we consume in our facilities; and (iv) estimated
water loss related to the supply of water to shantytowns (favelas).

Among the principal indicators utilized to measure rates of water loss are the following:

·         Water Billed Loss Index (WBLI), in %;

·         Water Metered Loss Index (based on metered consumption) (WMLI); and

·         Water Loss per Connection, (TLDC) in liters per connection per day.

These indicators are calculated by applying the following formulas:

WBLI =

Vproduced –
(Vinvoiced + Vused)
Vproduced

WMLI =

Vproduced –
(Vmeasured +
Vused)
Vproduced

TLDC 
= 

Vproduced –
(Vmeasured +
Vused)
Nconnection x
No. of days of a given
period

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Where:

Vproduced:  corresponds to the volume of water produced at a given period;

Vbilled:  corresponds to the volume of water billed at a given period;

Vmeasured:  corresponds to the volume of water measured at a given period;

Vused:  corresponds to the volume of water used for operational, public, private and social needs (supply
shantytown areas) at a given period; and

Nconnections:  corresponds to the average number of active water connections.

Using  this  calculation  method,  as  of  December  31,  2017,  we  experienced  348  liter/connection  per  day  of  water  loss  in  the  São  Paulo
metropolitan region and 232 liter/connection per day in the Regional Systems, averaging 302 liter/connection per day.  We have a Corporate
Program for Reduction of Water Loss in place that aims to reduce total water loss to around 273 liters/connection per day, Water Billed Loss
Index to 17.9% and the Water Metered Loss Index to 29.0% by 2020.  Nonetheless, on account of the drought, the negative impacts on our
revenue during 2015 and the necessity to prioritize investing in the expansion of water availability, the scope and the goals of our Corporate
Program for Reduction of Water Loss are under revision.

In  order  to  continue  to  supply  water  to  the  population  despite  its  low  availability,  one  of  the  measures  that  we  adopted  was  to  further
reduce water pressure across our network of operation.  Insomuch as the utilization of water sources, real water loss (water physically lost,
which corresponds to about 65% of the Water Metered Loss Index) fell from 22.2% in December 2008 to 20.0% in December 2017.  This
reduction  is  not  only  the  result  of  initiatives  to  combat  water  loss  including,  for  example,  strengthening  our  supply  systems’  “pressure
management”, but it can also be attributed to atypical and temporary operations.

For more information on the measure we have adopted to confront the water crisis, see “—The Recent Water Crisis”.

Our strategy to reduce water loss has two approaches:

·       reduction in the level of physical loss, which results mainly from leakage.  To this end we are primarily replacing and repairing water
transmission  lines  and  pipes  and  installing  probing  and  other  equipment,  including  strategically  located  pressure‑regulating  valves;
and

·        reduction of non‑physical loss, which results primarily from the inaccuracy of our water meters installed at our customers’ premises
and  from  clandestine  and  illegal  use.    To  this  end  we  are  upgrading  and  replacing  inaccurate  water  meters  and  expanding  our
anti‑fraud personnel.

We are taking measures to decrease physical loss by reducing response time to fix leakages and by better monitoring of non‑visible water

main fractures.  Among other initiatives, we have adopted the following measures to reduce physical water loss: 

·              the  introduction  of  technically  advanced  valves  to  regulate  water  pressure  throughout  our  water    transmission  lines  in  order  to
maintain appropriate water pressure downstream.  These valves are programmed to respond automatically to variations in demand. 
During peak usage, the flow of water in the pipes is at its highest point; however, when demand decreases, pressure builds up in the
water  transmission  lines  and  the  resulting  stress  on  the  network  can  cause  significant  water  loss  through  cracks  and  an  increase  in
ruptures of the pipes.  The technically advanced valves are equipped with probes programmed to feed data to the valve in order to
reduce  or  increase  pressure  to  the  water  transmission  lines  as  water  usage  fluctuates;  the  reconfiguration  of  interconnected  water
distribution to permit the distribution of water at lower pressure;

·        the implementation of routine operational leak detection surveys to reduce overall water loss;

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·        the monitoring of and improved accounting with respect to water connections, especially for large volume customers;

·        regular checking on inactive customers and monitoring non‑residential customers that are accounted for as residential customers and,

therefore, billed at a lower rate;

·        preventing fraud with the use of new, more sophisticated water meters that are more accurate and less prone to tampering;

·        installing water meters where none are present; and

·        conducting preventive maintenance of existing and newly installed water meters.

Water Quality

We believe that we supply high quality treated water that is consistent with the standards set by Brazilian law, which are similar to the
standards set in the United States of America and Europe.  Pursuant to the Brazilian Ministry of Health (Ministério da Saúde) regulations, we
have significant statutory obligations regarding the quality of treated water.

In  general,  the  state  of  São  Paulo  has  excellent  water  quality  from  underground  or  surface  water  sources.    However,  high  rates  of
population growth, increased urbanization and disorganized occupation of some areas of the São Paulo metropolitan region have reduced the
quantity and quality of water available to serve the population in the southern area of the São Paulo metropolitan region and in the coastal
region.  Currently, we successfully treat this water to make it potable.  We are also investing in improvements of our water transmission lines
and our treatment systems to ensure the quality and availability of water for the upcoming years.

Water  quality  is  monitored  at  all  stages  of  the  distribution  process,  including  at  the  water  sources,  water  treatment  facilities  and  in  the
distribution network.  We have 15 regional laboratories, one central laboratory, and laboratories located in all water treatment facilities that
monitor  water  quality,  as  required  by  our  standards  and  those  set  by  law.    Our  laboratories  analyze  an  average  of  90  thousand  samples  per
month on distributed water, with samples collected from residences.  Our central laboratory located in the city of São Paulo is responsible for
organic  compound  analysis  using  the  chromatographic  and  spectrometric  methods  as  well  as  heavy  metals  analysis  by  atomic  absorption
technique.    Our  central  laboratory  and  13  of  our  regional  laboratories  have  obtained  the  ABNT  NBR  ISO  IEC  17025  accreditation
(accreditation  for  general  requirements  for  the  competence  of  testing  and  calibration  laboratories)  awarded  by  the  National  Institute  of
Metrology, Quality and Technology, or INMETRO.

All  chemical  products  used  for  water  treatment  are  analyzed  and  follow  strict  specifications  set  out  in  recommendations  made  by  the
National  Health  Foundation  (Fundação  Nacional  de  Saúde),  or  NHF,    ABNT,  and  the  National  Standard  Foundation,  or  NSF,  and  the
American Water Works Association, or AWWA, to eliminate toxic substances that are harmful to human health.  From time to time, we face
problems with the proliferation of algae, which may cause an unpleasant taste and odor in the water.  In order to mitigate this problem, we
work on:  (i) fighting algae growth at the water source and (ii) using advanced treatment processes at the water treatment facilities that involve
the  use  of  powdered  activated  carbon  and  oxidation  by  potassium  permanganate.    The  algae  growth  creates  significant  additional  costs  for
water  treatment  because  of  the  higher  volumes  of  chemicals  used  to  treat  the  water.    Until  the  conclusion  of  the  program  in  2017,  we
participated  in  the  Water  Source  Program  (Programa  Mananciais)  together  with  other  organizations  engaged  in  the  promotion  of  urban
development  and  social  inclusion  to  mitigate  pollution  in  the  São  Paulo  metropolitan  region.    In  addition,  we  also  participate  in  the  Clean
Stream Program to clean important streams in the city of São Paulo.  Other initiatives also aimed at improving the water quality in the water
sources  located  in  the  of  São  Paulo  metropolitan  region  are  Nossa Guarapiranga  and  Pró‑Conexão.    See  “—Main  Projects  of  Our  Capital
Expenditure  Program—Metropolitan  Water  Program—Water  Source  Program,”  “—Clean  Stream  Program,”  and  “—Other  Policies  and
Programs—Nossa Guarapiranga”.

We believe that there are no material instances where our standards are not being met.  However, we cannot be certain that future breaches

of these standards will not occur.

Fluoridation

As required by Brazilian law, we add fluoride to the water at our treatment facilities prior to its distribution into the water supply network. 
Fluoridation  primarily  consists  of  adding  fluorosilicic  acid  to  water  at  between  0.6  mg/L  and  0.8  mg/L  to  assist  in  the  prevention  of  tooth
decay among the population.

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Sewage Operations

We  are  responsible  for  the  collection,  removal,  treatment  and  final  disposal  of  sewage.    As  of  December  31,  2017,  we  collected
approximately 81% and 85% of all the sewage produced in the municipalities in which we operate in the São Paulo metropolitan region and in
the Regional Systems, respectively.  During 2017, we collected approximately 83% of all the sewage produced in the municipalities in which
we operated in the state of São Paulo.  We installed 221.8 thousand, 236.6 thousand and  226.1  thousand  new  sewage  connections  in  2017,
2016 and 2015, respectively.

Sewage System

The purpose of our sewage system is to collect and treat sewage and to adequately dispose of the treated sewage.  As of December 31,
2017, we were responsible for the operation and maintenance of 50,991 kilometers of sewage lines, of which approximately 26,544 kilometers
are located in the São Paulo metropolitan region and 24,447 kilometers are located in the Regional Systems, respectively.

The following table sets forth the total number of kilometers of sewage lines and the total number of sewage connections in our network

for the periods indicated:

Sewage lines (in kilometers)
Sewage connections (in thousands)

2017
50,991
7,302

As of December 31,
2016
50,097
7,091

2015

48,774
6,861

Our sewage system comprises a number of systems built at different times and constructed primarily from clay pipes and, more recently,
PVC tubing.  Sewage lines larger than 0.5 meters in diameter are primarily made of concrete.  Our sewage system is generally designed to
operate by gravitational flow, although pumping stations are  required in certain parts of the system to ensure the continuous flow of sewage. 
Where pumping stations are required, we use sewage lines made of cast iron.

The public sewage system operated by us was structured in order to receive, in addition to household effluents, a portion of non-domestic
effluents  (such  as  industrial  sewage  and  sewage  from  other  non‑domestic  sources)  for  treatment  together  with  household  effluents.    Non-
domestic effluents have characteristics that are qualitatively and quantitatively different from household effluents.  As a result, the discharge of
non-domestic effluents into the public sewage system is subject to compliance with specific legal demands with the purpose of protecting the
sewage  collection  and  treatment  systems,  the  health  and  safety  of  operators  and  the  environment.    The  current  environmental  legislation
establishes  standards  for  the  discharge  of  these  effluents  into  the  public  sewage  system  and  stipulates  that  such  effluents  be  subject  to
pretreatment.  These standards are defined in State Decree No. 8,468/1976.  

Before  the  discharge  is  permitted,  we  carry  out  acceptance  studies  that  assess  the  capacity  of  the  public  sewage  system  to  receive  the
discharge  as  well  as  the  compliance  with  regulations.    Upon  the  conclusion  of  these  studies,  the  technical  and  commercial  conditions  for
receiving the discharge are established, which are then formalized in a document signed by us and the effluent producer.  Failure to comply
with  these  conditions  can  lead  to  the  application  of  penalties  by  us.    In  extreme  cases,  the  State  of  Sao  Paulo  Environmental  Agency
(Companhia Ambiental do Estado de São Paulo), or CETESB, is notified in order for the applicable measures to be taken.  Effluents from our
treatment facilities must comply with limitation guidelines for release of effluents into receiving water bodies.  Additionally, the quality of the
water in the receiving water body must not be impaired by the release of such effluents, as established by State Decree No. 8,468/1976 and
Conama Resolution No. 357/2005, as amended by Conama Resolution No. 430/2011.

We considered the condition of the sewage lines in the São Paulo metropolitan region to be adequate as of the date of this annual report. 
Due to a greater volume of sewage collected, a higher population and more extensive commercial and industrial development, the sewage lines
in the São Paulo metropolitan region are more deteriorated than those of the Regional Systems.  To counter the effects of deterioration, we
maintain an ongoing program for the maintenance of sewage lines intended to address anticipated fractures arising from obstructions caused by
system overloads.

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Unlike the São Paulo metropolitan region, the interior region of São Paulo State does not generally suffer obstructions caused by sewage
system  overload.    The  coastal  region,  however,  experiences  obstructions  in  its  sewage  lines  primarily  due  to  infiltration  of  sand,  especially
during the rainy season in the summer months.  In addition, the sewage coverage ratio in the coastal region is lower than in the other regions
served by us, at approximately 79% as of December 31, 2017.

New sewage connections are made on substantially the same basis as connections to water lines:  we assume the cost of installation for the
first  20  meters  of  sewage  lines  from  the  sewage  network  to  all  customers’  sewage  connections  and  the  customer  is  responsible  for  the
remaining costs.

The following table sets forth projected new sewage connections for the periods indicated: 

São Paulo metropolitan region
Regional Systems
Total 

Sewage Treatment and Disposal

2018

2019

2020

2021

in thousands

2022

2018‑2022

115
85
200

138
87
225

146
90
236

155
90
245

123
87
210

677
439
1,116

In 2017, approximately 63% and 98% of the consumer units of the sewage services used our sewage treatment system in the São Paulo
metropolitan region and the Regional Systems, respectively, or 75% of the consumer units of our sewage services in the state of São Paulo,
was  connected  at  our  treatment  facilities  and  afterwards  discharged  into  receiving  water  bodies  such  as  rivers  and  the  Atlantic  Ocean,  in
accordance  with  applicable  legislation.    Though  we  have  not  yet  reached  full  coverage  of  sewage  collection  and  treatment  services  in  the
regions were we operate, we are making efforts to reach this goal.

We  currently  operate  nine  ocean  outfalls  and  548  sewage  treatment  facilities,  of  which  the  five  largest,  located  in  the  São  Paulo

metropolitan region, have treatment capacity of approximately 21 cubic meters of sewage per second.

In the São Paulo metropolitan region, the treatment process used by most treatment facilities is the activated sludge process. 

Sewage treatment in the Regional Systems will vary according to the particularities of each area.  In the interior region of São Paulo State,
treatment consists largely of stabilization ponds.  There are 440 secondary treatment facilities in the interior region of São Paulo State that have
treatment capacity of approximately 16 cubic meters of sewage per second.  Similar to our disposal process for treated sewage collected in the
São Paulo metropolitan region, the majority of sewage collected in the coastal region receives treatment and disinfection and is then discharged
into  rivers  and  also  into  the  Atlantic  Ocean  through  our  ocean  outfalls,  in  accordance  with  applicable  legislation.    We  have  84  sewage
treatment facilities in the coastal region.

We  are  a  party  to  a  number  of  legal  proceedings  related  to  environmental  matters.    See  “Item  8.A.  Financial  Statements  and  Other
Financial Information—Legal Proceedings”.  In addition, our capital expenditure program includes projects to increase the amount of sewage
that we treat.  See “Item 4.A. History and Development of the Company—Capital Expenditure Program” and “Item 4.B. Business Overview—
Environmental Matters—Environmental Regulation—Sewage Requirements”.

Sludge Disposal

The  generation  of  sludge  is  inherent  to  the  sanitation  cycle.    The  treatment  of  water  and  sewage  produces  residue  which  needs  to  be
disposed of appropriately to prevent harm to the environment.  Sludge removed from the treatment process typically contains water and a very
small proportion of solids.  We use filter presses, belt presses, drying beds and centrifugation machines, among other processes, to abstract the
water from the sludge.

Sludge disposal must comply with State and Federal law requirements, such as Resolution No. 375/2006 of the CONAMA, Federal Law

No. 12,305/2010, Federal Decree No. 7,404/2010, State Law No. 12,300/2006 and State Decree No. 54,645/2009.

Currently, the sludge generated through our activity goes mainly to landfills.  In turn, we treat the leachate generated in these landfills.

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Current legislation and the population at large demand advances in the search for alternative technologies that minimize the generation of
and find beneficial uses for sludge.  In light of these demands, we work on several fronts, seeking innovative approaches to the destination and
final disposal of sludge. 

Additionally, using financing from the Financier  of  Studies  and  Projects  (Financiadora  de  Estudos  e  Projetos,  or  FINEP),  we  are  also
developing two other innovating projects aiming to reduce the disposal of sludge in landfills.  The first project uses a gasification system that
uses specialist technology to transform sludge from sewage treatment plants into a solid product, weighing 5% of its initial weight, which can
be re-used in construction work.  The second project consists of a sludge dryer that uses highly mechanized and automated processes, drawing
on solar energy, to reduce up to 70% of initial volume.

Principal Markets in Which We Operate

As of December 31, 2017, we operated water and sewage systems in 368 of the 645 municipalities in the state of São Paulo.  In addition,
we currently supply water on a wholesale basis to five municipalities located in the São Paulo metropolitan region with a total population of
approximately 3.0 million people.

The following table provides a breakdown of gross revenues from water supply and sewage services by geographic market for the years

indicated:

São Paulo metropolitan region
Regional Systems
Total 

Competition

2017

Year ended December 31,
2016
(in millions of R$)

2015

8,636.9
3,586.8
12,223.7

7,749.7
3,372.5
11,122.2

6,021.9
2,924.9
8,946.8

In the state of São Paulo, there are 277 municipalities that operate their own water and sewage systems and that collectively have a total

population of approximately 16.5 million, or approximately 38% of the population of the state of São Paulo.

The competition for municipal concessions arises mainly from the municipalities, as they may resume the water and sewage services that
were  granted  to  us  and  start  providing  these  services  directly  to  the  local  population.    In  this  case,  the  municipal  governments  would  be
required  to  indemnify  us  for  the  unamortized  portion  of  our  investment.    See  “—Risk  Factors—Risks  Relating  to  Our  Business—
Municipalities may terminate our concessions before they expire in certain circumstances.  The indemnification payments we receive in such
cases  may  be  less  than  the  value  of  the  investments  we  made”.    In  the  past,  municipal  governments  have  terminated  our  concessions
agreements before the expiration date.  Furthermore, municipal governments have tried to expropriate our assets in an attempt to resume the
provision of water and sewage services to local populations.  See “Item 8.A. Financial Statements and Other Financial Information—Legal
Proceedings”.    We  negotiate  expired  concession  agreements  and  concession  agreements  close  to  expiration  with  the  municipalities  in  an
attempt  to  maintain  our  existing  areas  of  operations.    In  the  state  of  São  Paulo  we  face  competition  from  private  and  municipal  water  and
sewage service providers.

In recent years, we have also experienced an increasing level of competition in the market of water supply to industrial customers.  Several
large industrial customers located in municipalities we serve use their own wells to meet their water needs.  In addition, competition for the
disposal  of  non‑residential,  commercial  and  industrial  sludge  in  the  São  Paulo  metropolitan  region  has  increased  in  recent  years  as  private
companies offer stand‑alone water treatment solutions inside the facilities of their customers.  We have also established new tariff schedules for
commercial  and  industrial  customers  in  order  to  assist  us  in  retaining  these  customers.    Since  these  fixed  demand  agreements  (take-or-pay
contracts) with certain of our industrial customers were not covered by our bonus program, until April 2016, we suspended the fixed demand
requirement in order to encourage lower water consumption.  In May 2016, we reinitiated the fixed demand requirement, and the volumes of
those contracts were revised according to clients’ new consumption profiles.  We started 2017 with 466 formal contracts and, after revision of
the  charge  and  volume,  ended  the  year  with  482  contracts.  18  contracts  were  terminated  because  they  did  not  meet  the  minimum  amount
required.  Of the remaining 482 contracts, 40 were entered into in 2017.   For  more  information  about  the  water  crisis,  see  “—The  Recent
Water Crisis”.  For more information on Take-or-pay Contracts see “—Tariff Structure—Fixed Demand Agreements (Take-or Pay)”.  For more
information about the water crisis, see “—The Recent Water Crisis”. 

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Billing Procedures

The procedure for billing and payment of our water and sewage services is largely the same for all customer categories.  Water and sewage
bills  are  based  upon  water  usage  determined  by  monthly  water  meter  readings.    Larger  customers,  however,  have  their  meters  read  every
15 days to monitor consumption and thus avoid water loss resulting from leakages.  Sewage billing is included as part of the water bill and is
based on the water meter reading.

The majority of the bills for water and sewage services are delivered to our customers in person, mainly through independent contractors
who  are  also  responsible  for  reading  water  meters,  although  a  proportion  of  clients  elected,  for  convenience  purposes,  to  receive  their  bill
through regular mail.  Water and sewage bills can be paid at some banks and other locations in the state of São Paulo.  These funds are paid
over  to  us  after  deducting  average  banking  fees  ranging  from  R$0.29  to  R$1.32  per  transaction  for  collection  and  remittance  of  these
payments. Customers must pay their water and sewage bills by the due date if they wish to avoid paying a fine.  We generally charge a penalty
fee and interest on late bill payments.  In 2017, 2016 and 2015, we received payment of 94.1%, 93.0% and 90.4%, respectively, of the amount
billed to our retail customers, and 94.1%, 93.0% and 90.2%, respectively, of the amount billed to those customers other than State entities,
within 30 days after the due date.  In 2017, 2016 and 2015, we received 99.2%, 97.2% and 96.2%, respectively, of the amount billed to the
State entities.  Amounts in excess of 100.0% reflect our recovery of amounts billed in prior years.  With respect to wholesale supply, in 2017,
2016 and 2015, we received payment of 60.1%, 74.1% and 43.8%, respectively, of the amount billed within 30 days.

We monitor water meter readings by use of hand‑held computers and transmitters.  The system allows the meter reader to input the gauge
levels on the meters into the computer and automatically print the bill for the customer.  The hand‑held computer tracks water consumption
usage at each metered location and prepares bills based on actual meter readings.  Part of the water meter monitoring for billing purposes is
carried out by our own personnel, trained and supervised by us, and part of it is carried out by third‑party contractors that employ and train
their own personnel whose training we supervise.

Tariffs

Tariff adjustments follow the guidelines established by the Basic Sanitation Law and ARSESP.  The guidelines also establish procedural
steps and the terms for the annual adjustments.  The adjustments have to be announced 30 days prior to the effective date of the new tariffs,
which previously would take effect in September.  Pursuant to the most recent tariff revision, both the base date and future adjustments took
place  in  April.  In  addition,  on  January  19,  2017  ARSESP  released  Resolution  nº  706,  which  divided  the  Second  Ordinary  Tariff  Revision
process into two parts. The first part ended in October 2017, and the second part ended in May 2018.

Tariffs have historically been adjusted once a year and for periods of at least 12 months.  See “—Government Regulations Applicable to

our Contracts—Tariff Regulation in the State of São Paulo” for additional information regarding our tariffs.

With  the  publication  of  the  Basic  Sanitation  Law,  Federal  Law  No.  11,445/2007,  states  have  been  required  to  establish  independent
regulators responsible for the regulation of basic sanitation services, including tariff regulation.  To exercise this assignment, the State of São
Paulo enacted State Law No. 1,025/2007, which established ARSESP, which regulates and supervises the services we provide to the State and
also to the municipalities that have agreed to its jurisdiction.  The guidelines by which we readjust our tariffs are defined pursuant to State
Decree No. 41,446/1996, which was ratified by Federal Law No. 11,445/2007 and regulated by by resolutions issued by ARSESP.

In regards to municipalities that have not explicitly selected ARSESP as their regulator, the Basic Sanitation Law allows the municipality
to create other regulatory agencies of their own.  In 2007, the municipality of Lins decided to create its own regulatory authority, although it
revised  this  decision  in  2010,  transferring  to  ARSESP  the  regulation  of  the  water  activities  performed  in  Lins,  including  for  the  setting  of
tariffs.  The municipality of Lins has reserved, however, the power to ultimately approve the tariff set by ARSESP.  

In  addition,  in  2011,  the  municipalities  located  in  the  hydrographic  basins  of  the  Piracicaba,  Capivari  and  Jundiaí  rivers  created  a
consortium  known  as  ARES/PCJ  to  regulate  and  supervise  our  activities  in  those  areas,  and  for  similar  purposes,  in  November  2013  the
Regulatory  Agency  of  São  Bernardo  do  Campo  (AR/SBC)  was  created.    As  a  result  of  the  creation  of  the  ARES/PCJ,  we  are  currently
involved  in  legal  proceedings  in  which  ARES/PCJ  is  claiming  that  it  has  jurisdiction  over  the  regulation  and  supervision  of  our  activities
in three municipalities (Mombuca, Santa Maria da Serra and Aguas de São Pedro). In 2016 we obtained a definitive favorable decision in the
Piracaia proceeding. However, as the debate continues in other processes, we cannot predict the outcome of this case or how it may impact our
business. Furthermore, regional and municipal agencies may continue to be created and may dispute with ARSESP regarding the regulation
and oversight of our services.  See “Item 3.D. Risk Factor—Risks Relating to Our Business—Current regulatory uncertainty, especially with
regard to implementation and interpretation of the Brazilian Basic Sanitation Law, may have an adverse effect on our business”.

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In 2009, ARSESP invited public discussion and hearings to take place regarding the methodology for tariff revisions.  In 2010, ARSESP
issued Resolution No. 156/2010.  This resolution established the methodology and general criteria for the valuation of our regulatory asset base
to  be  used  for  purposes  of  tariff  review  processes  and  auditing.    In  May  2011,  ARSESP  disclosed  the  applicable  weighted  average  cost  of
capital  (8.06%)  and  disclosed  in  April  2012  the  methodology  for  tariff  revisions.    In  November  2012,  ARSESP  published  a  preliminary
technical  note  for  public  consultation,  proposing  a  preliminary  initial  maximum  average  tariff  (P0)  and  X  Factor,  based  on  a  preliminary
evaluation of assets held by us.

In 2012 and 2011, we readjusted our prices by 5.15% and 6.83% starting on September 11, 2012 and on September 11, 2011, respectively. 
On  April  22,  2013,  ARSESP  approved  a  preliminary  tariff  revision  of  2.3509%  to  be  applied  equally  on  all  customer  tariffs.    These
adjustments were valid for all municipalities we serve, except for the municipalities that possess specific contractual tariff clauses.

First Ordinary Tariff Revision (2013-2016)

On  November  1,  2013,  ARSESP  issued  Resolution  No.  435/2013  which  authorized  us  to  implement  a  tariff  adjustment.    Initially,  this
adjustment  considered  an  inflation  rate  of  6.2707%  as  measured  by  the  IPCA  for  the  period  from  August  2012  to  July  2013.    From  this
number, ARSESP deducted the efficiency factor, or “X Factor”, of 0.4297% for the period, and this resulted in an adjustment of 5.8410%. 
Additionally,  ARSESP  estimated  the  gain  that  we  had  with  the  preliminary  tariff  revision  of  2.3509%  beginning  in  April  2013,  and  this
resulted in a further reduction of 0.9249% in the indicator.  Moreover, ARSESP also estimated our loss of 0.6538% resulting from the delay in
the reposition of the IPCA and added that estimated amount.  The product of these estimations and considerations resulted in a linear increase
of 3.1451% in tariffs beginning December 11, 2013.

In  April  2014,  ARSESP  issued  Resolution  No.  484/2014  (further  ratified  by  ARSESP  Resolution  No.  520/2014),  which,  among  other
things:  (i) established that, as of May 11, 2014, a tariff repositioning index of 5.4408% in relation to our tariffs at the time and an annual X
Factor of 0.9386%, which will be deducted in the upcoming annual tariff adjustments, shall be applied to water services bills; (ii) allowed us to
apply  the  repositioning  index  arising  from  the  tariff  revision  at  a  more  opportune  future  date,  when  we  proceeded  with  a  recalculation  and
monetary  adjustment  of  the  applicable  amounts,  in  order  to  ensure  our  economic  and  financial  balance,  taking  into  account  the  atypical
situation in our market due to the lack of rainfall and our measures to encourage water savings in order to ensure supply; (iii) established that
the next annual tariff adjustments would occur on the following dates:  on April 11, 2015 and April 11, 2016, with the next tariff revision on
April 11, 2017; and (iv) ratified the readjustment rules set forth on Resolution No. 406/2013 and updated the X Factor for the tariff cycle from
0.836%  to  0.9386%.    The  tariff  structure  was  in  place  with  respect  to  our  services  until  the  new  structure  was  approved  by  ARSESP  and
implemented.    Considering  what  was  established  by  Resolution  No.  484/2014,  we  decided  to  postpone  the  application  of  the  repositioning
index to an opportune date no later than the end of December 2014. 

ARSESP Resolution No. 520/2014, published on November 27, 2014, authorized us to implement a final tariff revision as of December
27,  2014  with  a  repositioning  index  of  6.4952%.    This  percentage  corresponds  to  the  index  of  the  5.4408%  tariff  revision  increase  already
granted as a result of the conclusion of the tariff revision, approved by ARSESP Resolution No. 484/2014 of April 10, 2014, and an additional
1%  index,  accrued  to  the  index  for  partial  compensation  regarding  the  postponement  of  the  tariff  revision  application.    This  additional  1%
index may be revised or supplemented after ARSESP analyzes data related to our loss in revenue on account of the application postponement. 

Water Consumption Reduction Incentive Program and Contingency Tariff as a Result of the Water Crisis

ARSESP Resolution No. 469, published in February 2014, authorized us to adopt a Water Consumption Reduction Incentive Program for
consumers whose consumption of water was reduced by 20% in comparison with their consumption in the period from February 2013 through
January 2014.

In April 2014, the incentive program was extended for the entire São Paulo metropolitan region until the end of 2014 or until the water
level in the reservoirs normalized.  In May 2014, the incentive program was extended to the municipalities we served in Piracicaba, Capivari
and the Jaguari River Basin in the Cantareira System catchment area, and remained in effect for invoices issued between June and December
2014.  This latter extension of the incentive program was suspended on April 17, 2015.

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In  October  2014,  we  implemented  changes  to  the  discount  ranges  in  the  bonus  program:    (i)  customers  who  reduced  their  water
consumption by 10-15% became entitled to a 10% discount on their service bill; (ii) customers who reduced their water consumption by 15-
20% became entitled to a 20% discount; and (iii) customers who reduced their water consumption by 20% or more became entitled to a 30%
discount.    

ARSESP Resolution No. 536, published in December 2014, authorized us to extend the Water Consumption Reduction Incentive Program

until the earlier of either the end of 2015 or the date on which levels in the reservoirs normalizes.

In December 2015, we requested ARSESP to ratify the continuity and update of the Water Consumption Reduction Incentive Program
through the Bonus grant to the Water and Sewage Bill, as well as the continuity of the Contingency Tariff. In response, ARSESP published the
following 2 resolutions:

(1)    Resolution  No.  614/2015,  published  in  December  2015,  authorized  the  extension  until  December  31,  2016,  or  until  hydrological
conditions become more predictable, of the effects of ARSESP Resolution No. 545/2015, maintaining the current rules and conditions
for the application of the contingency tariff by us envisaged in Resolution No. 545/2015; and

(2)  Resolution No. 615/2015, also published in December 2015, authorized the extension of the Water Consumption Reduction Incentive
Program  until  December  31,  2016,  or  until  hydrological  conditions  become  more  predictable,  and  updated  of  the  reference
consumption  value  used  to  determine  when  discounts  should  be  offered  to  our  customers.    Prior  to  this  resolution,  the  reference
consumption  value  by  which  we  calculated  the  discounts  was  the  average  consumption  of  our  customers  in  the  period  between
February 2013 and January 2014.  As of December 2015, we modified the reference consumption value, which was set at 78% of the
prior  reference  consumption  value.    The  updated  reference  consumption  value  began  to  be  applied  to  our  customers’  bills  as  of
February 1, 2016.  The bonus ranges of 10%, 20% and 30%, were maintained, following the rules of our discount (bonus) program
which established that if a client consumes 10% less water during a certain period compared to his reference consumption value, he
will obtain a discount of 20% in his water bill, and if the client consumes 20% less water, he obtains a discount of 30%.

ARSESP Resolution No. 545/2015, published in January 2015, authorized us to implement a contingency tariff mechanism consisting of
additions to water and sewage bills for customers whose monthly consumption exceeds the average monthly consumption verified, between
February 2013 and January 2014.  The tariff is subject to a contingency as follows:

I.            a 40% increase on the tariff amount applicable to the water consumption portion that exceeds up to 20% of the average; or

II.          a 100% increase on the tariff amount applicable to the water consumption portion that exceeds more than 20% of the average.

Extraordinary Tariff Revision as a Result of the Water Crisis

In  March  2015,  we  filed  a  request  with  ARSESP  for  an  extraordinary  tariff  revision  due  to  the  decline  in  the  volume  of  water  billed
because of the water crisis and the unforeseen increase in electricity tariffs.  After analyzing our request and receiving opinions through public
consultations, ARSESP published Resolutions No. 560/2015 and No. 561/2015: 

I.             Resolution No. 560/2015, published May 4, 2015, authorized a readjustment of 7.7875% on existing tariffs, which constituted
of:  (i) an annual tariff readjustment for the year of 2015 of 7.1899%, calculated based on the 8.1285% variation in the IPCA in
the period between March 2014 and March 2015, minus the efficiency factor of 0.9386%; and (ii) the additional adjustment of
0.5575% due to the postponement of the application of the Ordinary Tariff Review (the tariff review that adjusts tariffs according
to inflation), authorized in May 2014 but only applied in December 2014, when it was partially compensated; and

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II.          Resolution No. 561/2015, also published May 4, 2015, established the 6.9154% index of the Extraordinary Tariff Revision (the
tariff revision we requested due to the decline in the volume of water billed due to the water crisis and the unpredicted increase in
electricity  tariffs)    of  the  Company,  applicable  to  the  tariffs  authorized  on  this  date  by  Resolution  No.  550.    Both  tariff
adjustments, combined, resulted in the 15.24% index.  The new tariff values began apply on June 5, 2015.

Cancelation of Water Consumption Reduction Incentive Program and Contingengy Tariff

In  March  2016,  we  filed  with  ARSESP  a  request  to  cancel  the  Water  Consumption  Reduction  Incentive  Program  and  the  Contingency

Tariff.  In response, ARSESP published on March 31, 2016, the following Resolutions:

I.            Resolution No. 640/2016, authorizing the cancellation of the Contingency Tariff, which was applied to water meter readings as

of May 1, 2016; and

II.          Resolution No. 641/2016 authorizing the cancellation of the Water Consumption Reduction Incentive Program, which granted

discounts to water and sewage bills.  This cancellation was applied to water meter readings as of May 1, 2016.

Second Ordinary Tariff Revision (2017-2020)

The  Second  Ordinary  Tariff  Revision  was  originally  expected  to  occur  in  April  2017.    To  this  effect,  on  October  15,  2016,  ARSESP
released Resolution No. 672/2016, after public consultation, establishing the methodology and criteria for the update of our regulatory asset
base in the Second Ordinary Tariff Revision.

Due to delays in retaining a consulting company to advise ARSESP on the tariff revision and to the fact that it was impossible to predict
when this consulting would be retained, ARSESP released Resolution No. 706/2017 on January 19, 2017. This resolution divided the Second
Ordinary Tariff Revision process into two parts. Due to extensions resulting from the need for supplemental information from us, the first part,
which was initially expected to be concluded by June 30, 2017, was completed on October 10, 2017.  The second part was concluded in May
2018.

On October 6, 2017, ARSESP published the Final Technical Note NT/F/004/2017 and the Detailed Report on the first part of the Second
Ordinary Tariff Revision. These publications set the initial regulatory remuneration asset  base at R$40.3 billion (although this value is not yet
final), increased the annual rate (WACC) from 8.06% to 8.11% and set the preliminary tariff revision (Preliminary P0) at R$3.6386/m3 using
the April 2017 price. On October 10, 2017, ARESP approved Resolution No. 753/2017, authorizing us to apply the tariff repositioning index
of 7.8888% to the current rates beginning 30 days after the publication of Resolution No. 753/2017.

On November 10, 2017, ARSESP approved the increase of the Regulatory, Control and Inspection Fee (Taxa de Regulação, Controle e
Fiscalização, or TRCF) by 0.5%. This increase is reflected in customer bills in the municipalities regulated by ARSESP, pursuant to Paragraph
2 of Article 2 of ARSESP Resolution No. 406/2013. This fee was initially established by the State Complementary Law No. 1.025/2007.

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With respect to the second stage of the Second Ordinary Tariff Revision, on March 26, 2018, ARSESP released Preliminary Technical
Note NT/F/0004-2018 with the proposed calculation of the maximum average tariff (P0) and the X Factor. This technical note established a
final regulatory asset base of R$38.4 billion, a WACC of 8.11%, an X Factor of 0.9287%, a P0 of R$3.8207/m³ and a tariff repositioning index
of 4.7744%. After Public Consultation and Public Hearings on the Final P0 proposal during the period from March 27, 2018 to April 17, 2018,
ARSESP released, on May 9, 2018, Final Technical Note NT/F/0006/2018 and Resolution No. 794/2018 with tariffs effective 30 days after
publication.

The  final  result  of  the  second  stage  of  the  Second  Ordinary  Tariff  Revision  established  a  final  regulatory  asset  base  of  R$39  billion,  a

WACC of 8.11%, an X Factor of 0.8888%, a P0 of R$3.7702/m³ and a tariff repositioning index of 3.5070%.

On May 24, 2018, as a result of the final result of the Second Ordinary Tariff Revision, we filed a reconsideration request as well as a

clarification and revision request with ARSESP.

The reconsideration request includes an administrative appeal requesting that the regulatory decision substantiated by ARSESP Resolution
No. 794/2018 be revised to apply due compensatory adjustments for revenue, cost of electricity and investments executed between 2013 and
2016.

The clarification and revision request includes requests for (i) an explanation of the significant reduction in the final Operational
Expenditure 2017-2020 forecast; and (ii) a revision of the X Factor calculation, a revision to account for compensatory adjustments for the
delay in the Second Ordinary Tariff Revision’s effectiveness and a revision of the calculation of the financial component related to municipal
funds.

Contract with the State and the City of São Paulo, dated June 23, 2010

With regard to the contract dated June 23, 2010, executed with the State and the city of São Paulo to regulate the provision of water and
sewage services for the next 30 years, among other principal terms of this agreement, we must transfer 7.5% of our gross revenues, subtracting
the COFINS and PASEP taxes and unpaid bills of publicly owned properties in the city of São Paulo, to the Municipal Fund for Environmental
Sanitation and Infrastructure (Fundo Municipal de Saneamento Ambiental e Infraestrutura), ARSESP issued the following resolutions:

·            In  March  2013,  ARSESP  issued  Resolution  No.  407/2013,  authorizing  us  to  pass  on  to  our  consumers  the  7.5%  transfer  to  the
Municipal  Fund  for  Environmental  Sanitation  and  Infrastructure,  as  defined  by  municipal  legislation.    Pursuant  to  the  Sewage  and
Water Supply Service Contracts, this charge must be considered in the tariff revision.

·      In April 2013, ARSESP issued Resolution No. 413/2013, which effectively suspended Resolution No. 407/2013 until the first tariff
revision  process  is  concluded,  thereby  postponing  our  authorization  to  pass  on  to  our  consumers’  service  bill  the  charge  for  the
Municipal Fund for Environmental Sanitation and Infrastructure.  The postponement of Resolution No. 407 was due to a request from
the Government of the State of São Paulo to analyze, among other matters, methods of reducing the impact on consumers.   

·      In May 2014, ARSESP issued Resolution No. 488/2014, which maintained the suspension of ARSESP Resolution No. 407/2013 until
the outcome of the revision of the contract signed between us, the city of São Paulo and the State of the São Paulo is known, thereby
delaying the authorization to pass on to our consumers’ service bill the charge for the Municipal Fund for Environmental Sanitation
and Infrastructure.  We cannot be certain when the contract will be revised or when we will be able to pass the 7.5% charge on to
consumers through the service bill.

·      In December 2016, we concluded the first four-year revision of our contract with the city of São Paulo, which altered our service

quality, investment and investment tracking targets.  However, the issue of the 7.5% charge was not discussed.

·      In January 2018, the second step of our Second Ordinary Tariff Revision was initiated. In this review, the possibility of including the
average  tariff  in  the  portion  related  to  transfers  to  municipal  funds,  as  is  the  case  with  the  7.5%  that  we  transfer  to  the  São  Paulo
Municipal Fund for Environmental Sanitation and Infrastructure, was discussed.

·      On May 9, 2018 ARSESP announced the final results of the Second Ordinary Tariff Revision, recognizing the regulatory limit of 4%
of each municipality’s direct operating revenue in the tariff calculation. As a result, 1.84% was declared the tariff for the Municipality
of São Paulo, corresponding to the 4% regulatory limit.

·      On May 24, 2018, as a result of the final result of the Second Ordinary Tariff Revision, we filed a reconsideration request as well as a
clarification and revision request with ARSESP. As part of the clarification and revision request, we requested that ARSESP provide a
revision  of  the  calculation  of  the  financial  component  related  to  municipal  funds.  For  more  information,  see  “Item  4.B.  Business
Overview—Tariffs—Second Ordinary Tariff Revision (2017-2020).”

For more information see “Item 3.D. Risk Factors—Risks Relating to Our Business—The terms of our agreement to provide water and

sewage services in the city of São Paulo could have a material adverse effect on us.”

Tariff Structure

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Regarding the tariff structure, ARSESP Resolution No. 463/2014, published in January 2014, established April 10, 2014, as the deadline
for  publication  of  the  timetable  for  implementation  of  our  new  tariff  structure.    However,  on  April  17,  2014,  ARSESP  issued  Resolution
No. 484/2014, which maintains the current Tariff Structure and does not set a date for implementation of the new tariff structure. 

Despite  not  having  a  concrete  date  for  the  implementation  of  the  new  tariff  structure,  we  are  conducting  a  series  of  studies  on  a  new
structure that will be delivered to ARSESP.  Considering the various alterations that this new structure could bring about for the consumer, we
plan to implement it over one or more tariff cycles.  To date, we cannot predict when we will be able to send our proposal to ARSESP or when
implementation may start.

Until the new tariff structure is approved by ARSESP, we will continue to use our current tariff structure.  As such, we currently divide
tariffs into two categories:  residential and non‑residential.  The residential category is subdivided into standard residential, residential-social
and shantytown (favela).  The residential-social tariffs apply to residences of low‑income families, residences of persons unemployed for up to
12  months  and  collective  living  residences.    The  favela  tariffs  apply  to  residences  in  shantytowns  characterized  by  a  lack  of  urban
infrastructure.  The latter two sub‑categories were instituted to assist lower‑income customers by providing lower tariffs for consumption.  The
non‑residential  category  consists  of:    (i)  commercial,  industrial  and  public  customers;  (ii)  ”not‑for‑profit”  entities  that  pay  50.0%  of  the
prevailing non‑residential tariff; (iii) government entities that have entered into a water loss reduction agreement with us and pay 75.0% of the
prevailing non‑residential tariff; and (iv) public entities that have entered into program agreements, for municipalities with a population of up
to 30.0 thousand and with half or more classified according to their degree of social vulnerability by the Social Vulnerability Index of São
Paulo (Índice Paulista de Vulnerabilidade Social) 5 and 6, of the SEADE, obtained through the analysis of the 2000 Census figures, and start
to receive tariff benefits, in accordance with our normative ruling, for the category of public use, at the municipality level.  The tariffs are equal
to those offered to the commercial/entity of social assistance and that corresponds to 50.0% of the public tariffs without contractual provisions
referred to in item (iv) above.

Fixed Demand Agreements (Take‑or‑Pay)

We  established  a  new  tariff  schedule,  effective  May  2002,  for  commercial  and  industrial  customers  that  consume  at  least  5,000  cubic
meters  of  water  per  month  and  that  enter  into  fixed  demand  agreements  (take‑or‑pay)  with  us  for  at  least  one‑year  terms,  with  the  aim  of
retaining these industrial and commercial customers.  In October 2007, the minimum volume for entering into these agreements was reduced
from  5.0  thousand  cubic  meters  per  month  to  3.0  thousand  cubic  meters  per  month.    We  believe  this  tariff  schedule  will  help  prevent  our
commercial and industrial customers from switching to the use of private wells.  Since 2008, we have been authorized by ARSESP to establish
tariffs  for  non‑residential  customers,  such  as  industrial  and  commercial  customers,  that  consume  more  than  3.0  thousand  cubic  meters  per
month, with a maximum tariff equal to the tariffs applicable to non‑residential customers that consume more than 50 cubic meters per month. 
In 2010,ARSESP authorized a reduction in the minimum volume of consumption for customers that enter into fixed demand agreements with
us to a minimum of 500 cubic meters per month. 

In  May  2016,  we  reinitiated  the  fixed  demand  requirement,  and  the  volumes  of  those  contracts  were  revised  according  to  clients’  new
consumption  profiles.    We  started  2017  with  466  formal  contracts  and,  after  revision  of  the  charge  and  volume,  ended  the  year  with  482
contracts. 18 contracts were terminated because they did not meet the minimum amount required.  Of the remaining 482 contracts, 40 were
entered into in 2017.  For more information about the water crisis, see “—The Recent Water Crisis”.

Water and sewage services tariffs

We establish separate tariff schedules for our services in each of the São Paulo metropolitan regions and each of the interior region of São
Paulo State and coastal regions which comprise our Regional Systems.  Each tariff schedule incorporates regional cross‑subsidies, taking into
account the customers’ type and volume of consumption.  Tariffs paid by customers with high monthly water consumption rates exceed our
costs  of  providing  water  service.    We  use  the  excess  tariff  billed  to  high‑volume  customers  to  compensate  for  the  lower  tariffs  paid  by
low‑volume  customers.    Similarly,  tariffs  for  non‑residential  customers  are  established  at  levels  that  subsidize  residential  customers.    In
addition, the tariffs for the São Paulo metropolitan region generally are higher than tariffs in the interior region of São Paulo State and coastal
regions.

Sewage charges in each region are fixed and are based on the same volume of water charged.  In the São Paulo metropolitan region and
the coastal region, the sewage tariffs are equal to the water tariffs.  In the majority of the municipalities of the interior region of the State of
São Paulo, sewage tariffs are approximately 20.0% lower than water tariffs.  Wholesale water rates are the same for all municipalities served. 
We also make available sewage treatment services to those municipalities in line with the applicable contracts and tariffs.  In addition, various
industrial customers pay an additional sewage charge, depending on the characteristics of the sewage they produce.  Each category and class of
customer  pays  tariffs  according  to  the  volume  of  water  consumed.    The  tariff  paid  by  a  certain  category  and  class  of  customer  increases
progressively according to the increase in the volume of water consumed.  The first category (0-10) corresponds to the minimum fee that is
charged to our customers for the consumption of water.  The following table sets forth the water and sewage services tariffs by (i) customer
category  and  class;  and  (ii)  volume  of  water  consumed,  charged  in  cubic  meters  during  the  years  and  period  stated  in  the  São  Paulo
metropolitan region:

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Customer Category Consumption
Residential

As of Nov 10, 2017

As of May 12, 2016
(reais per m3)

As of June 4, 2015

Standard Residential:
0‑10(1)
11‑20
21‑50
Above 50

Social:
0‑10(1)
11‑20
21‑30
31‑50
Above 50

Shantytown  (favela):
0‑10(1)
11‑20
21‑30
31‑50
Above 50
Non‑Residential

Commercial/Industrial/Governmental:
0‑10(1)
11‑20
21‑50
Above 50

Social Welfare Entities:
0‑10(1)
11‑20
21‑50
Above 50
Government entities that employ the Rational Use of Water Program (Programa de Uso Racional

da Água  – PURA), with reduction agreement:

0‑10(1)
11‑20
21‑50
Above 50

2.42

3.78

9.44

10.40

0.82

1.41

5.01

7.14

7.89

0.63

0.71

2.36

7.14

7.89

4.85

9.44

18.08

18.84

2.42

4.71

9.08

9.43

3.63

7.07

13.60

14.13

2.24

3.50

8.75

9.64

0.76

1.31

4.64

6,.62

7.31

0.58

0.66

2.19

6.62

7.31

4.50

8.75

16.76

17.46

2.25

4.37

8.42

8.74

3.37

6.55

12.61

13.10

2.06

3.23

8.07
8.89

0.70

1.21

4.28

6.10
6.74

0.53

0.61

2.02

6.10
6.74

4.15

8.07

15.45
16.10

2.07

4.03

7.76
8.06

3.11

6.04

11.63
12.08

(1)        

The minimum volume charged is for ten cubic meters per month.

In 2017, 2016 and 2015, the average tariff calculated for the Regional Systems was approximately 25% below the average tariff of the São

Paulo metropolitan region.

On  April  11,  2016,  ARSESP  issued  Resolution  No.  643/2016,  which  authorizes  us  to  implement  an  8.4478%  tariff  adjustment  to  our

current tariffs, effective on May 12, 2016.

On October 10, 2017, ARSESP issued Resolution No. 753/2017, which authorizes us to implement a 7.8888% repositioning index to our

current tariffs, effective on November 10, 2017.

On  November  10,  2017,  ARSESP  approved  the  increase  of  the  TRCF  by  0.5%.  This  increase  is  reflected  in  customer  bills  in  the
municipalities  regulated  by  ARSESP,  pursuant  to  Paragraph  2  of  Article  2  of  ARSESP  Resolution  No.  406/2013.  This  fee  was  initially
established by the State Complementary Law No. 1.025/2007.

On  May  9,  2018,  ARSESP  issued  Resolution  No.  794/2018,  which  authorizes  us  to  implement  a  3.5070%  repositioning  index  to  our

current tariffs, effective 30 days after publication.

Government Regulations Applicable to our Contracts

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Basic  sanitation  services  in  Brazil  are  subject  to  extensive  federal,  state  and  local  legislation  and  regulation  that,  among  other  matters,

regulates:

·         the development of public‑private partnerships, or PPPs;

·         the need of a public bidding process for the appointment of water and sewage services providers via concession agreements;

·         the need of setting up an agreement for the appointment of public water and sewage services providers;  

·         the joint management of public services through cooperation agreements, allowing for a program agreement without the need for a

public bidding process for the service provider;

·         the planning, regulation and inspection of basic sanitation services prohibited by service providers;

·         minimum requirements for water and sewage services;

·         water usage;

·         water quality and environmental protection; and

·         governmental restrictions on the incurrence of debt applicable to state‑controlled companies.

PLANASA

In 1978, the operations of basic sanitation services, integrated to the National Plan of Basic Sanitation (Plano  Nacional  de  Saneamento
Básico),  or  “PLANASA”,  were  regulated  by  Law  No.  6,528/1978,  which  regulated  and  supervised  state  sanitation  companies,  such  as
SABESP. SABESP was created under State Law No. 119/1973 as a mixed capital company to provide basic sanitation services in the state of
São Paulo while also acknowledging the autonomy of the municipalities within the State.

Pursuant to the Brazilian Constitution, the authority to develop and provide public water and sewage services are the joint responsibility of
the federal government, the states and the municipalities.  Article 216 of the Constitution of the State of São Paulo establishes that the State
must provide the conditions for the efficient management and adequate expansion of water and sewage services rendered by its agencies and
State‑controlled companies or any other concessionaire under its control. 

Pursuant  to  Article  175  of  the  Brazilian  Constitution,  the  rendering  of  public  services,  such  as  water  and  sewage  services,  is  the
responsibility of the applicable public authority.  However, any such public authority has the right to render these services directly or through a
concession granted to a third party after a bidding process.

Additionally, Article 241 of the Brazilian Constitution establishes the legal regime for managing the rendering of public services among
different federal, state and municipal government entities, including the total or partial transfer among these entities of fees, services, personnel
and  essential  goods  needed  to  render  such  public  services.  For  example,  such  service  can  be  rendered  through  a  public  consortium  or  a
cooperation  agreement  under  Federal  Law  No.  11,107  of  April  6,  2005,  also  known  as  the  Law  on  Public  Consortia  and  Cooperation
Agreements (Lei de Consórcios Públicos e Convênio de Cooperação), which, in turn, created a contract program which allowed for the waiver
of the bidding process for companies like ours.

The Basic Sanitation Law

The Basic Sanitation Law No. 11,445/2007, or “The Basic Sanitation Law”, went into effect on January 5, 2007, effectively revoking and
substituting the PLANASA model, establishing nationwide guidelines for basic sanitation and seeking to create the appropriate solutions for
the provision of basic sanitation considering the particular conditions in each state and municipality.  The Basic Sanitation Law also sought to
facilitate the cooperation between the state and municipalities in the rendering of public services. 

The  Basic  Sanitation  Law  establishes  the  following  guiding  principles  for  the  public  service  of  basic  sanitation:    universalization,
integrality, efficiency and economic sustainability, transparency of actions, social control and integration of infrastructure and services with the
management  of  water  resources.    It  does  not  define  the  ownership  of  the  sanitation  services,  but  establishes  certain  minimum  liability
thresholds,  such  as  the  development  of  local  and  regional  sanitation  plans,  the  need  to  create  norms  for  the  regulation  and  supervision  of
services, the creation of the entities responsible for such regulation and establishment of the rights and obligations of the users and of social
control mechanisms, in addition to the principles listed below: 

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·        for public-private partnership contracts (or program contracts), public hearings must be held with respect to bid announcements;

·        the carrying out of technical and financial feasibility studies;

·        the holding of public hearings regarding concession bidding notices and contract drafts;

·        the rights and obligations of customers and service providers, including penalties, are determined by the owner of the public service,

not by the regulatory agency (since its function is to ensure full compliance of legislative and contractual conditions);

·        the regulatory agency’s function is to ensure compliance with the law and with the contractual conditions;

·        the technical and financial viability of the provision of water and sewage services;

·        the interruption of the provision of sanitation services by the service provider in the event of a default of payment of the tariffs by the

customer, among other reasons, provided that mimimum conditions for maintaining health are assured;

·                when  parts  of  a  regulated  service  are  to  be  provided  by  different  service  providers,  those  providers  must  execute  an  agreement

regulating their respective activities;

·        the definition of principles and guidelines which must be respected when securing public funds generated or operated by agencies or

entities of the federal government;

·        the possibility of using subsidies as an instrument of social policy in order to ensure access to basic sanitation services to everyone,

particularly for low‑income families; and

·        the obligation to adopt environmental criteria that include, among other measures, individual management of water consumption per

habitation unit.

By  establishing  the  principles  listed  above,  the  Basic  Sanitation  Law  defines  the  laws  and  regulations  under  which  a  water  and  basic
sanitation  provider  may  provide  its  services  to  several  regions  controlled  by  different  owners  (i.e.,  one  single  provider  serves  two  or  more
owners, for which there may be one plan for the combination of services).

The rules for implementation of the new principles and directives set forth in Federal Law No. 11,445/2007 are established by Federal
Decree No. 7,217 / 2010, dated June 21, 2010; as amended by Federal Decree No. 8,211, dated March 21, 2014; Federal Decree No. 8,629,
dated December 30, 2015; and Federal Decree No. 9.254, dated December 29, 2017.

In addition, the Basic Sanitation Law defines the rules for the delegation of the regulation, control and monitoring of sanitation services by
the states and municipalities to contracted parties and the conditions for any such provision of public services. The Basic Sanitation Law also
significantly amends Article 42 of the Federal Concessions Law No. 8,987/1995, which establishes the administrative proceedings necessary
for the termination of concessions prior to the expiration date and the reversibility conditions for unamortized investments that create assets
upon the termination of a concession.  The amendment to Article 42 establishes that when a concession is terminated prior to its expiration
date,  the  service  provider  must  be  indemnified  for  unamortized  investments  that  create  assets,  preferably  through  an  amicable  settlement
between the parties defining the criteria for the calculation and payments of indemnity. 

Furthermore, the Basic Sanitation Law also provides that the provision of sanitation services may be interrupted by the service provider, in
the  event  of  a  default  of  payment  of  the  tariffs  by  the  customer,  among  other  reasons.    The  provision  of  sanitation  services  may  only  be
interrupted after a written notice, and as long as minimum health requirements are met.  

The Basic Sanitation Law defines the criteria for the reversal of assets at the time of termination of the water and sewage public service
contract, which term also encompasses concession agreements such as those that have expired or are effective for an indefinite term, or those
that  were  not  formalized  by  an  agreement.    In  addition,  the  Basic  Sanitation  Law  provides  the  criteria  for  calculating  the  amount  of  an
indemnity  due,  which  may  be  calculated  by  a  specialized  institution  chosen  by  mutual  agreement  between  the  parties  in  a  formal  payment
agreement.

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Pursuant to the Basic Sanitation Law, the parties involved in a concession may enter into an agreement with respect to the payment of the
indemnification  due  to  the  concessionaire.    However,  in  the  absence  of  an  agreement,  the  Basic  Sanitation  Law  establishes  that  the
indemnification  must  be  paid  in  no  more  than  four  equal  and  successive  annual  installments,  with  the  first  installment  payable  by  the  last
business day of the fiscal year in which the assets are reversed. The provision of public services will remain valid until the conclusion of any
administrative measures undertaken by the entity responsible for such services.

According to the Basic Sanitation Law, the existing concession or water and sewage public service contract will remain in effect until the

responsible public entity concludes the administrative proceedings necessary for termination.

The Basic Sanitation Law provides that our new water and sewage public service contracts must be planned, supervised and regulated by
the  municipalities  together  with  the  State  under  a  new  model  of  associated  management  that  will  allow  for  better  control,  supervision,
transparency and efficiency in the provision of public services.

Contracts for the Provision of Essential Basic Sanitation Services in Brazil

In  Brazil,  there  are  three  federal  legal  regimes  for  contracting  water  and  sewage  services:    (i)  public  concessions,  regulated  by  Law
No. 8,987/1995, which require a prior public bidding process; (ii) administration of public services through cooperation agreements between
the federal government and local public authorities at State and municipal level without the need for a public bidding process, regulated by the
Public  Consortia  and  Cooperation  Agreement  Law  No.  11,107/2005;  and  (iii)    PPPs  regulated  by  Law  No.  11,079/2004,  used  to  grant
concessions to private companies to provide public services and used in relation to construction works associated with the provision of public
services. 

The Federal Concessions Law No. 8,987/1995 and the State Concessions Law No. 7,835/1992 require that the granting of a concession by
the government be preceded by a public bidding process.  However, the Federal Public Bidding Law No. 8,666/1993, which establishes the
rules for the public bidding process, provides that a public bidding process can be waived under certain circumstances, including in the case of
services to be provided by a public entity created for such specific purpose on a date prior to the effectiveness of this law, provided that the
contracted price is compatible with what is practiced in the market.  Furthermore, a provision of the Federal Public Bidding Law, as amended
by  the  Public  Consortia  and  Cooperation  Agreement  Law,  provides  that  the  program  contracted  can  be  executed  with  waiver  of  a  public
bidding process.

The Constitution of the State of São Paulo provides that the State shall ensure the adequate provision and efficient administration of water

and sewage services in the state territory by a company under its control, such as our company.

Our Concession Agreements

From 1998 to 2005, our contracts with municipalities have been regulated by the Federal Concessions Law No. 8,987/1995.  Generally,
these contracts have a 30‑year term, and the total value of the concession is set by the discounted cash flow method.  Under this method, when
the expected contractual cash flow is reached, the total value of the concession and assets is amortized to zero on our books and we receive no
payment for the assets.  If the concession is terminated prior to the end of the 30‑year term, thereby interrupting the normal contractual cash
flow,  we  are  paid  an  amount  equal  to  the  present  value  of  the  expected  cash  flow  over  the  years  remaining  in  the  concession,  adjusted  for
inflation.

Concessions for providing water and sewage services are formalized by agreements executed between the state or municipality, as the case
may  be,  and  a  concessionaire  to  which  the  performance  of  these  services  is  granted  in  a  given  municipality  or  region.    Our  concessions
normally have a contractual term of up to 30 years.  However, our concessions in general can be revoked unilaterally at any time if certain
standards of quality and safety are not met, in the event of default of the terms of the concession agreement, or due to changes in public interest
since the concession was granted.  

A municipality that chooses to assume the direct control of its water and sewage services must terminate the current relationship by duly
compensating the service provider and the investments unamortized.  Subsequently, the municipality will be in charge of rendering services or
of  conducting  a  public  bidding  process  to  grant  the  concession  to  potential  concessionaires,  including  agreements  with  public  companies
directly.    The  Basic  Sanitation  Law  reduced  the  maximum  time  period  for  payment  of  indemnification  in  such  cases  to  four  years.    See
“Item  3.D.  Risk  Factors—Risks  Relating  to  Our  Business—Municipalities  may  terminate  our  concessions  before  they  expire  in  certain
circumstances.  The indemnification payments we receive in such cases may be less than the value of the investments we made”.

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Program Agreements

On  April  6,  2005,  the  federal  government  enacted  Federal  Law  No.  11,107/2005,  or  the  Federal  Public  Consortia  and  Cooperation
Agreement  Law,  which  regulates  Article  241  of  the  Brazilian  Constitution.    This  statute  provides  general  principles  to  be  observed  when  a
public  consortium  enters  into  contracts  with  the  Brazilian  federal  government,  state  governments,  the  Federal  District  and  municipalities,
regulating the joint management of public services.

Federal  Law  No.  11,107/2005  introduces  significant  changes  in  the  relationship  among  municipalities,  states  and  companies  providing
public sanitation services, prohibiting the latter from exercising the activities of planning, oversight and regulation, including tariff regulation,
of the services.  The law also created the program agreement, a contract to be followed when Brazilian states and municipalities enter into
agreements for the provision of public services with mixed capital companies.  The program agreement provides the guidelines for the joint
management of public services by Brazilian states and municipalities with mixed capital companies.  Furthermore, this agreement allows states
and municipalities to waiver the public bidding process and still be in compliance with concession legislation when entering into contracts with
entities that are owned by the Brazilian states or municipalities.

Federal Decree No. 6,017/2007 details the conditions for the establishment of joint management entities and the execution of the program

agreement regulating the Public Consortia and Cooperation Agreement Law. 

Pursuant  to  the  Brazilian  Constitution,  in  metropolitan  regions,  urban  conurbations  and  microregions,  the  authority  to  develop  public
water and sewage systems is shared by the states and municipalities.  However, for municipalities which are not a part of the types of regions
cited above (metropolitan regions, urban conurbations and microregions), the primary responsibility for providing water and sewage services
to residents rests with the municipality. 

The  Constitution  of  the  State  of  São  Paulo  provides  that  the  State  shall  assure  the  correct  operation,  necessary  expansion  and  efficient
administration of water and sewage services in the state of São Paulo by a company under its control.  On January 13, 2006, the Governor of
the  State  of  São  Paulo  enacted  State  Decree  No.  50,470/2006,  amended  by  State  Decrees  No.  52,020/2007,  dated  July  30,  2007,  and
No. 53,192/2008, dated July 1, 2008, which regulate the provision of water and sewage services in the State of São Paulo.  Pursuant to these
decrees,  we  may  enter  into  agreements  with  municipalities  in  connection  with  the  provision  of  water  and  sewage  services  by  means  of  a
“program agreement without a public bidding process”.  In addition, these decrees established that we will continue to render services in the
areas  covered  by  the  concession  granted  by  the  State.    Following  the  entry  into  force  of  the  Public  Consortia  and  Cooperation  Agreements
Law,  we  adopted  the  administration  of  public  services  through  cooperation  agreements  and  program  agreement  which  can  be  used
simultaneously. 

Public‑Private Partnerships

Public-Private  Partnerships,  or  “PPPs”,  are  long-term  contracts  between  private  parties  and  government  entities,  for  providing  a  public
asset or service, in which the private parties bears significant risk and management responsibility, and remuneration is linked to performance. 
PPPs are regulated by the State of São Paulo through Law No. 11,688/2004, which was enacted on May 19, 2004.  PPPs may be used for: 
(i) implantation, expansion, improvement, reform, maintenance or management of public infrastructure; (ii) provision of public services; and
(iii) exploitation of public assets and non‑material rights belonging to the State.

Payment is conditioned upon performance.  The payment may be collected through:  (i) tariffs paid by users; (ii) use of resources from the
budget;  (iii)  assignment  of  credits  belonging  to  the  State;  (iv)  transfer  of  rights  related  to  the  commercial  exploitation  of  public  assets;
(v) transfer of real property and other property of assets; (vi)  public debts securities; and (vii) other revenues.

We do not currently provide any basic sanitation services to municipalities through PPPs.

Agreements with Municipalities and Metropolitan Regions

The state of São Paulo, pursuant to Article No. 25, Paragraph 3 of the Brazilian Constitution, enacted the LCE  to create the metropolitan
regions of São Paulo (LCE No. 94/1974), Baixada Santista (LCE No. 815/1996), Campinas (LCE No. 870/2000), Vale do Paraíba and Litoral
Norte  (LCE  No.  1,166/2012),  and  Sorocaba  No.  (LCE  1,241/2014)  and  the  urban  clusters  of  Piracicaba  (LCE  No.  1,178/2012)  and  Jundiaí
(LCE No. 1,146/2011). 

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Pursuant  to  the  Brazilian  Constitution,  in  metropolitan  regions,  urban  conurbations  and  microregions,  the  authority  to  develop  public
water and sewage systems is shared by the states and municipalities.  However, for municipalities which are not a part of the types of regions
cited above (metropolitan regions, urban conurbations and microregions), the primary responsibility for providing water and sewage services
to residents rests with the municipality.

We provide basic sanitation services for municipalities, urban conurbations and metropolitan regions.  In these municipalities, operations
are regionalized and contracts are structured considering the financial and economic conditions of the entire region.  The regulation including
taxes, control and oversight are the responsibilities of ARSESP (LCE 1,025/2007 – Articles No. 6 and No. 10). With regard to local operations,
the municipalities are responsible for providing basic sanitation services.  Thus, we operate through new contracts executed pursuant to a legal
waiver  of  public  tender  under  cooperation  agreements  between  the  state  and  municipalities  which  permit  sharing  the  management  of  basic
sanitation services.  With regard to metropolitan regions, we conduct our operations based on state legislation and contracts and make a note of
any pending litigation addressing the delineation of responsibilities regarding basic sanitation services in municipalities, metropolitan regions,
urban conurbations and microregions.

On March 6, 2013, the Brazilian Supreme Court decided a matter related to the shared management of basic sanitation services in the state
of Rio de Janeiro, whose effects may impact other ongoing legal proceedings. In its decision, the court ruled that the state of Rio de Janeiro
must establish new entity, owned by both the state of Rio de Janeiro and the relevant municipalities, to oversee the planning, regulation and
auditing  of  basic  sanitation  services  in  its  metropolitan  region  with  the  non-partisan  participation  of  all  the  municipalities  located  in  the
metropolitan region; creating a requirement that the state and the municipalities must participate jointly in the shared management of public
services.

However, this decision is not yet fully effective, and therefore does not yet alter the legislative framework regarding basic sanitation that is

currently in effect for the State of São Paulo.

In January 2015, the Federal Government issued the Metropolitan Bylaws (Law No. 13,089/2015), amended by Provisional Measure No.
818 of January 11, 2018, establishing within the term of five years, counted from the date of the institution of the metropolitan region or urban
cluster:  (i)  the general  guidelines  for  the  planning,  management  and  performance  of  public  initiatives  in  metropolitan  regions  and  in  urban
clusters  instituted  by  the  states;  (ii)  the  general  planning  standards  for  integrated  urban  development  and  other  interfederal  governance
instruments;  and  (iii)  the  criteria  to  receive  federal  loans  related  to  urban  development.  In  addition,  the  Metropolitan  Bylaws  foresees
mechanisms for integrated management and interfederal governance as well as the sharing of decisions by regional entities.

Despite the Brazilian Supreme Court’s March 6, 2013 decision and the Metropolitan Bylaws, some municipalities in metropolitan regions
and  urban  clusters,  including  in  metropolitan  regions  where  we  operate,  have  been  conducting  bidding  processes  for  the  concession  of
sanitation services without including shared management.

Establishment of ARSESP

On  June  8,  2006,  the  State  of  São  Paulo  enacted  Decree  No.  50,868/2006,  creating  the  Commission  for  the  Regulation  of  Sanitation
Service of the State of São Paulo (Comissão de Regulação do Serviço de Saneamento do Estado de São Paulo), or  “CORSANPA”, to regulate
basic sanitation services.  CORSANPA was directly subordinated to the State Secretariat for Sanitation and Water Resources.  The main duty
of CORSANPA was conducting studies for the creation of a regulatory agency for the basic sanitation industry and the presentation of legal
and regulatory measures. 

The completion of such duties resulted in the publication of supplementary Law No. 1,025/2007 of December 7, 2007, which created the
São  Paulo  State  Sanitation  and  Energy  Regulatory  Agency  (Agência  Reguladora  de  Saneamento  e  Energia  do  Estado  de  São  Paulo),  or
“ARSESP”,  and  partially  revoked  Supplementary  Law  No.  7,750/1992.    Furthermore,  Supplementary  Law  No.  1,025/2007  maintained
CONESAN, as an advisory council to define and implement the state basic sanitation policy, and the State Sanitation Fund (Fundo Estadual de
Saneamento)  or“FESAN”.    FESAN  is  connected  to  the  State  Secretariat  for  Sanitation  and  Water  Resources,  and  collects  and  manages
resources that support State‑approved programs, as well as the development of technology, management and human resources and a sanitation
information system, in addition to other support programs.

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On August 5, 2009, the State of São Paulo enacted Decree No. 54,644/2009, which revoked Decree No. 50,868/2006 and regulated the
composition,  organization  and  operation  of  the  State  Sanitation  Council  (Conselho  Estadual  de  Saneamento),  or  “CONESAN”  created  by
Supplementary Law No. 7,750/1992.

In connection with the scope of our services, Supplementary Law No. 1,025/2007 expanded the range of services that we can render, with
the inclusion of urban rainwater drainage and management, urban cleaning and solid waste management, as well as the operation of power
generation, storage, conservation and sales activities, for our own or third‑party use.

In addition, the rules simplified the process for the expansion of our business in Brazil and abroad, authorizing us to:

·        participate in the controlling block or the capital of other companies;

·        create subsidiaries, which may become majority or minority shareholders in other companies; and

·        establish partnerships with national or foreign companies, including other state or municipal basic sanitation companies, in order to

expand our activities, share technology and expand investments related to basic sanitation services.

ARSESP  regulates  the  basic  sanitation  services  that  belong  to  the  State,  relating  to  the  federal  and  municipal  jurisdictions  and

prerogatives, and is responsible for: 

·        the compliance with and enforcement of state and federal basic sanitation legislation;

·        the publication of the organizational platform for the services, indicating the types of services provided by the State, as well as the

equipment and facilities that compose the system;

·        the acceptance, where applicable, of the legal attributions of the jurisdictional authority;

·        the establishment, in accordance with the tariff guidelines defined by Decree No. 41,446/96, of tariffs and other methods that provide
compensation  for  our  services,  adjustment  and  review  of  such  tariffs  and  methods  to  ensure  the  financial‑economic  balance  of
services and low‑cost tariffs through mechanisms that increase service efficiency and lead to the distribution of productivity gains to
society; and

·                the  approval,  oversight  and  regulation  (including  tariff  issues)  of  the  sewage  treatment  and  wholesale  water  supply  agreements

entered into between the state supplier and other suppliers, pursuant to Article 12 of the Basic Sanitation Law.

With respect to municipal basic sanitation, ARSESP oversees and regulates services (including tariff issues) that have been delegated by
municipalities to the State as a result of cooperation agreements that authorize program agreements between the municipalities and us for as
long as it is convenient to the municipality’s public interest.

For  its  services,  ARSESP  charges  0.50%  of  the  annual  total  invoice  from  net  operating  revenue  (excluding  revenues  relating  to  the
construction of concession infrastructure) of the municipality.  This fee is collected from municipalities that have a signed program agreement
with us and the municipalities located in the metropolitan regions. 

Rules Enacted by ARSESP

In 2009, ARSESP enacted rules regarding the following:

·         general terms and conditions for water and sewage services;

·         procedures for communication regarding any failure in our services;

·         penalties for deficiencies in the provision of basic sanitation services; and

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·         procedures for confidential treatment of our customers’ private information.

Consumer Relations in the State of São Paulo

In  2011,  ARSESP  altered  the  standard  contract  that  we  are  required  to  use  in  our  relationships  with  retail  customers.    This  alteration
requires that invoices be sent to the user of the service rather than the owner of the property connected to the public water supply and sewage
systems.  Since 2011, we have implemented several measures and instituted new rules to update our client registry.  Currently, more than 90%
of our water and sewage connections are billed to the user of our services, as foreseen under current regulations. Related to the collection of
debt,  we  are  also  faced  with  the  challenge  of  collecting  customers’  taxpayer  identification  numbers,  which  are  required  to  register  for  our
services  and  are  needed  for  the  judicial  collection  of  outstanding  fees  in  the  event  of  nonpayment.  We  continuously  update  our  customers’
registration  information,  but  we  face  difficulties  in  updating  this  information  in  areas  with  high  concentrations  of  social  vulnerability  and
noncompliance.

Regarding  changes  to  the  communication  process  for  the  reporting  of  failures,  ARSESP  has  modified  the  rules  and  standards  for
supervision  and  reporting  of  incidents.    We  have  implemented  these  requested  changes.    Currently,  we  receive  a  portion  of  the  reported
incidents online, through the Incident Reporting System (“Sistema de Comunicação de Incidentes”) established by ARSESP, which introduces
greater transparency and control to our operations.

In  2013,  in  compliance  with  rules  enacted  by  ARSESP,  we  established  procedures  for  communicating  scheduled  interruptions  in  the

provision of water services by developing the Communication of Scheduled Interruptions of Basic Sanitation, or “SISCIP-S”. 

We are currently evaluating the enforceability and legality of some of these rules.  Implementation of these rules started during 2011, is
currently  ongoing,  and  is  expected  to  continue  for  the  next  few  years.    The  implementation  of  these  rules  will  impact  our  commercial  and
operations processes, and may adversely affect us in ways we cannot currently predict.

We are attentive to these regulatory changes, have been working toward meeting ARSESP’s requirements and recommendations, and have
presented technical, legal and factual reasons for any conduct that ARSESP may find irregular.  As a result, we are subject to few regulatory
infractions and to limited fines.  See “Risk Factors—Risks Relating to Our Business—Current regulatory uncertainty, especially with regard to
implementation and interpretation of the Brazilian Basic Sanitation Law, may have an adverse effect on our business”

Following the increase in the demand for regulatory work, we created a regulatory affairs department, which focuses on regulatory matters
and has centralized communication with the regulatory agencies, driving business to the new regulatory regime and proposing matters in which
we have an interest to ARSESP.

In April 2011, we created a specific department in our Financial, Economic and Investor Relations Office responsible for costs and tariffs,
given  the  subject’s  importance  to  the  continuation  of  our  business.  We  also  created  a  statutory  Regulatory  Affairs  Committee,  which  was
responsible  for  defining  the  guidelines,  strategies  and  regulatory  recommendations  for  our  Company  and  coordinating  the  work  of  the
Regulatory Affairs Department. This committee was terminated in April 2018 due to revisions to our bylaws. Regulatory matters are currently
handled by our executive officers.

Our Current Concession Agreements

The current concessions are based on a standard form of agreement between us and the relevant municipality.  Each agreement received
the prior approval of the legislative council of each municipality.  The assets comprising the existing municipal water and sewage systems are
transferred from the municipality to us in order for us to provide the contracted services.  Until 1998, we acquired municipal concessions and
the existing water and sewage assets in exchange for our common shares issued at book value.  Since 1998, we have acquired concessions and
water and sewage assets by paying the municipality an amount equal to the present value of 30 years of estimated cash flows from the date of
acquisition  of  the  concession,  assuming  a  discount  of  at  least  12%.    For  reference  purposes,  in  2011  ARSESP  set  the  discount  rate  for  our
contracts at 8.06%and in October 2017 the discount rate was updated to 8.11% due to the Second Ordinary Tariff Revision.  See “—Tariffs”.

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The main provisions of our existing concession agreements are as follows:

·         we assume all responsibility for providing water and sewage services in the municipality;

·                  according  to  the  municipal  laws  authorizing  the  concession,  we  are  permitted  to  collect  tariffs  for  our  services  and  tariff

readjustments follow the guidelines established by the Basic Sanitation Law and ARSESP;

·         as a general rule, to date, we are exempt from municipal taxes, and no royalties are payable to the municipality with respect to the

concession;

·         we are granted rights of way on municipal property for the installation of water pipes and water transmission lines, and sewage lines;

and

·         upon termination of the concession, for any reason, we are required to return the assets that comprise the municipality’s water and
sewage  system  to  the  municipality  and  the  municipality  is  required  to  pay  us  the  non‑amortized  value  of  the  assets  relating  to  the
concession.

These assets have been considered to be intangible assets since January 2008.  See Note 3.8 to our financial statements.  Under concession

agreements executed prior to 1998, the reimbursement for the assets may be through payment of either:

·         the book value of the assets; or

·         the market value of the assets as determined by a third‑party appraiser in accordance with the terms of the specific agreement.

Our new agreement model follows the provisions of the Basic Sanitation Law.  Its main contractual provisions include the joint execution
of  planning,  supervision  and  regulation  of  services,  the  appointment  of  a  regulatory  authority  for  the  services,  and  periodic  disclosure  of
financial statements.

Furthermore, the economic and financial formulas in new agreements must be based on the discounted cash flow methodology and on the
revaluation of returnable assets.  Pursuant to the Basic Sanitation Law, the preexisting assets will be returned to the grantor of the concession. 
We will carry out all new investments and the municipalities will record them as assets.  The municipalities will then transfer possession of
these assets to us for our use and management and will also record a credit in the same amount of the assets recorded in our favor.  According
to Article 42 of the Basic Sanitation Law and the new agreement model, investments made during the contractual period are the property of the
applicable  municipality,  which  in  turn  generates  receivables  for  us  that  are  to  be  recovered  through  the  operation  of  the  services.    These
receivables may also be used as guarantees in funding operations.

Another  important  development  was  that  the  new  agreement  model  includes  exemptions  from  municipal  taxes  applicable  on  our
operational  areas  and  the  possibility  of  the  revaluation  of  our  assets  that  existed  prior  to  the  execution  of  the  program  agreements  in  cases
involving the early resumption of services by the concession authority.

As of December 31, 2017, we provided water and sewage services to 368 municipalities.  The majority of these concessions have 30-year
terms.  Due to court orders, we temporarily suspended our services in two other municipalities (Macatuba and Cajobi).  For more information,
see “Item 8.A. Financial Statements and Other Financial Information—Legal Proceedings”.  Between January 1, 2007 and December 31, 2017,
we entered into agreements with 287 municipalities (including our services agreement with the city of São Paulo) in accordance with the Basic
Sanitation Law, of which six were entered into in 2017.  As of December 31, 2017, these 287 municipalities accounted for 81.7% of our gross
operating revenues (including revenues relating to the construction of concession infrastructure).  In addition to the contracts that have 30-year
terms,  the  municipalities  entered  into  cooperation  contracts  with  the  State  of  São  Paulo,  delegating  the  regulation  and  monitoring  of  the
provision of services to ARSESP.  As of December 31, 2017, 51 of our agreements or concessions had expired but we continued to provide
water  and  sewage  services  to  these  municipalities  and  were  in  negotiations  to  execute  program  agreements  to  substitute  the  expired
concessions.  From January 1, 2018 through 2030, 32 concessions will expire.

Municipalities have the inherent power under Brazilian law to terminate concessions prior to their contractual expiration dates for reasons
of public interest.  The municipality of Mauá, which we previously served, terminated our concession in December 1995.  As arranged, we
transferred ownership of the related assets as well as of the provision of services to the municipality of Mauá.  In another contract we entered
into  with  the  Basic  Sanitation  Company  of  the  Municipality  of  Mauá  (Saneamento  Básico  do  Município  de  Mauá  –  SAMA)  and  the
municipality of Mauá, we were responsible for providing water on a wholesale basis.  However, neither SAMA nor the municipality of Mauá
complied with the stipulations of the agreement, culminating in a lawsuit brought against both parties.  We demanded monetary compensation
for our basic sanitary services.  In a separate suit, we are demanding SAMA pay us the correct amount of tariffs for water services it has been
receiving without our authorization at a cost below that contracted.

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The receivables owed to us by Mauá, due to the termination of the concession, total R$85.9 million and have not been recognized in our
financial statements due to the uncertainty of our ability to collect them as of December 31, 2017. Despite these developments, we currently
supply  water  on  a  wholesale  basis  to  Mauá.    In  January  2016,  the  municipality  of  Mauá  executed  a  Protocol  of  Intentions  with  us  for  the
preparation of studies and evaluations aiming to resolve commercial relations and existing debts between the municipality and us.  However,
the negotiations with Mauá ended June 2016. On April 19, 2018, we published a press release stating that we have been in contact with the
municipality of Mauá regarding directly supplying water to four neighborhoods that have been affected by a water shortage, and that we will
initiate formal discussions to engage in negotiations with the municipality.

We currently do not anticipate that other municipalities will seek to terminate concessions due to our close relationship with municipal
governments,  recent  improvements  in  the  water  and  sewage  services  we  provide,  and  the  obligation  of  the  municipality  to  repay  us  for  the
return of the concession. However, we cannot be certain that other municipalities will not seek to terminate their concessions in the future. See
“Item  3.D.  Risk  Factors—Risks  Relating  to  Our  Business—Municipalities  may  terminate  our  concessions  before  they  expire  in  certain
circumstances.  The indemnification payments we receive in such cases may be less than the value of the investments we made”.   

In addition, we are currently involved in litigation with respect to municipalities that intend to expropriate our water and sewage systems,
or to terminate concession agreements before paying us any indemnification.  For a detailed discussion on these proceedings, see “Item 8.A.
Financial Statements and Other Financial Information—Legal Proceedings”.

Operations in the City of São Paulo and Certain Metropolitan Regions

We  are  a  concessionary  of  the  state  of  São  Paulo  tasked  with  providing  operate  basic  sanitary  services  in  metropolitan  regions,

microregions and urban conglomerates instituted by state law.

The state of São Paulo, pursuant to Article No. 25, Paragraph 3 of the Brazilian Constitution, enacted the LCE  to create the metropolitan
regions of São Paulo (LCE No. 94/1974), Baixada Santista (LCE No. 815/1996), Campinas (LCE No. 870/2000), Vale do Paraíba and Litoral
Norte  (LCE  No.  1,166/2012),  and  Sorocaba  No.  (LCE  1,241/2014)  and  the  urban  clusters  of  Piracicaba  (LCE  No.  1,178/2012)  and  Jundiaí
(LCE No. 1,146/2011). 

On June 18, 2009, Municipal Law No. 14,934/2009 repealed Municipal Law 13,670/2003, which had assigned the responsibility for the
city of São Paulo’s planning, regulating and supervising the provision of water supply and sewage collection services exclusively to the city of
São Paulo. On June 23, 2010, the State and the city of São Paulo entered into a formal agreement with the purpose of sharing the planning of
the provision of water supply and sewage collection services; delegating oversight and regulation, including tariff regulation, to ARSESP; and
authorizing the maintenance of water supply and sewage collection services in the city of São Paulo for a 30-year term (renewable for the same
period).

In January 2015, the Federal Government issued the Metropolitan Bylaws (Law No. 13,089/2015), amended by Provisional Measure No.

818 of January 11, 2018, establishing within the term of  five years, counted from the date of the institution of the metropolitan region or urban
cluster:  (i) the general guidelines for the planning, management and performance of public interest initiatives in metropolitan regions and in
urban clusters instituted by the states; (ii) the general planning standards for integrated urban development and other interfederal governance
instruments; and (iii) the criteria to receive federal loans related to urban development. 

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On March 6, 2013, the Brazilian Supreme Court decided a matter related to the shared management of basic sanitation services in the state
of Rio de Janeiro. In its decision, the court ruled that the state of Rio de Janeiro must establish a new entity, owned by both the state of Rio de
Janeiro and the relevant municipalities, to oversee the planning, regulation and auditing of basic sanitation services in its metropolitan region
with  the  non-partisan  participation  of  all  the  municipalities  located  in  the  metropolitan  region;  creating  a  requirement  that  the  state  and  the
municipalities must participate jointly in the shared management of public services.

However, this decision is not yet fully effective, as a ruling on a motion for clarification is currently pending, and therefore does not yet
alter  the  legislative  framework  regarding  basic  sanitation  that  is  currently  in  effect  for  the  State  of  São  Paulo.  The  São  Paulo  metropolitan
region (including the municipalities to which we provide water on a wholesale basis, but excluding the concession infrastructure construction
revenue) accounted for 70.7% of our gross operating revenue from services in 2017.

The  São  Paulo  metropolitan  region  accounted  for  70.7%  of  our  gross  operating  revenue  in  2017  (excluding  revenues  relating  to  the
construction of concession infrastructure) and including the formal agreement with the municipality of São Paulo.  We cannot predict how the
shared management of these operations will be carried out in the São Paulo metropolitan region and other metropolitan regions we operate in
or what effect it may have on our business, financial condition or results of operations.  See “Item 3.D. Risk Factors—Risks Relating to Our
Business—Current regulatory uncertainty, especially with regard to implementation and interpretation of the Brazilian Basic Sanitation Law,
may have an adverse effect on our business”.  

Tariff Regulation in the State of São Paulo

The tariffs for our services are subject to Federal and State regulation.

On December 16, 1996, the Governor of the State of São Paulo issued a decree which approved the existing tariff system and allowed us
to  continue  to  set  our  own  tariffs.    We  used  to  set  our  tariffs  based  on  the  general  objectives  of  maintaining  our  financial  condition  and
preserving “social equality” in terms of the provision of water and sewage services to the population while providing a return on investment. 
The governor’s decree also directs us to apply the following criteria in determining our tariffs:

·         category of use;

·         capacity of the water meter;

·         characteristics of consumption;

·         volume consumed;

·         fixed and floating costs;

·         seasonal variations of consumption; and

·         social and economic conditions of residential customers.

With the enactment of the Basic Sanitation Law and Federal Consortium Law, we are prohibited from planning, overseeing and regulating
services, which includes determining the tariff policy to be adopted.  Such activities are to be exercised by the owner of the concession.  Other
than the responsibility for planning, the remaining activities may not be delegated.

The  current  tariff  structure  maintains  different  tariff  schedules,  depending  upon  whether  a  customer  is  located  in  the  São  Paulo
metropolitan  region  or  the  Regional  Systems.    There  are  four  levels  of  volume  consumed  for  each  category  of  customer,  except  for  the
residential-social and shantytown (favelas) categories.  The residential-social tariffs apply to residences of low income families, residences of
persons unemployed for up to 12 months and collective living residences.  The favela tariffs apply to residences in shantytowns characterized
by a lack of urban infrastructure.  The latter two sub categories were instituted to assist lower income customers by providing lower tariffs for
consumption.  Customers are billed on a monthly basis.  Water and sewage bills are based upon water usage determined by monthly water
meter  readings.    Larger  customers,  however,  have  their  meters  read  every  15  days  to  avoid  nonphysical  loss  resulting  from  faulty  water
meters.    Sewage  billing  is  included  as  part  of  the  water  bill  and  is  based  on  the  water  meter  reading.    We  are  also  authorized  to  enter  into
individual contracts with certain customers, such as municipalities, to supply water or sewage services on a wholesale basis.

Furthermore,  since  Law  No.  11,445/2007  permits  municipalities  to  create  their  own  regulatory  agencies  rather  than  being  subjected  to
overview by ARSESP, a number of municipalities created their own regulatory agencies.  The municipality of Lins, which decided in 2007 to
create its own regulatory authority, revisited this decision in 2010 and transferred the regulation of water activities, including the setting of
tariffs, to ARSESP.  The municipality of Lins has reserved, however, the power to ultimately approve the tariff set by ARSESP.

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The municipalities in which the hydrographic basins of the Piracicaba, Capivari and Jundiaí rivers are located created a consortium known
as the Regulatory Agency of Sanitation Services for the Piracicaba, Capivari and Jundiaí River Basin (Agência Reguladora dos Serviços de
Saneamento das Bacias dos Rios Piracicaba, Capivari e Jundiaí), or ARES-PCJ, in 2011 to regulate and supervise our activities in those areas,
and for similar purposes, in November 2013 the Regulatory Agency of São Bernardo do Campo (AR/SBC) was created.  As a result of the
creation  of  ARES/PCJ,  we  are  currently  involved  in  legal  proceedings  in  which  ARES/PCJ  is  claiming  that  it  has  jurisdiction  over  the
regulation  and  supervision  of  our  activities  in  three  municipalities  (Mombuca,  Santa  Maria  da  Serra  and  Aguas  de  São  Pedro).    We  cannot
predict the outcome of this case or how it may impact our business.  See “Item 3.D. Risk Factors—Risks Relating to Our Business—Current
regulatory uncertainty, especially with regard to implementation and interpretation of the Brazilian Basic Sanitation Law, may have an adverse
effect on our business”.

The Recent Water Crisis 

Prior to 2014, we planned our supply of water to the São Paulo metropolitan region based on the water supply during the driest period on
record, which was from 1953 to 1954.  However, water inflow to the Cantareira reservoirs throughout 2014 and most of 2015 was less than
half the inflow recorded in 1953, the previous most critical year.  Consequently, the volume of water stored in the reservoirs in 2014 and 2015
declined significantly until September 2015, when the reservoirs once again held more water than 12 months previously for the first time since
the  beginning  of  the  water  crisis.    In  the  rainy  season  from  October  2015  to  March  2016  rainfall  returned  to  historical  averages  and  water
levels in the reservoirs that provide water to the São Paulo metropolitan region, our largest market, increased. With the return of the rainfall to
its  historical  average  and  the  level  of  water  in  the  reservoirs  that  provide  water  to  the  population  of  the  São  Paulo  metropolitan  region  at
normal  levels,  the  measures  taken  during  the  water  crisis  to  continue  services  to  consumers  were  gradually  discontinued.  At  December  31,
2017, the reservoirs in the São Paulo metropolitan region contained 916.8 million m3 of water storage for treatment, compared to 951.1 million
m3  available  for  treatment  as  of  December  31,  2016  not  including  the  technical  reserve  of  287.5  million  m³.  The  average  monthly  water
production in 2017 for the São Paulo metropolitan region was 60.6 cubic meters per second, or m³/s, compared to 58.5 m³/s in 2016 and 52.0
m³/s in 2015.

For more information on the water production systems which we use to produce water for the São Paulo metropolitan region, see “Item

4.B. Business Overview—Description of Our Activities—Water Operations—Water Resources”.

Cantareira System

The Cantareira System is located in the northern area of the São Paulo metropolitan region.  It uses water extracted from the PCJ River
Basin and the Juqueri River Basin and consists of six reservoirs interconnected by a complex water network of tunnels and pipes, located along
the municipalities of São Paulo, Mairiporã, Nazaré Paulista, Piracaia, Vargem, and Joanópolis.  The latter two are located on the border of the
state  of  Minas  Gerais,  approximately  100  kilometers  from  the  city  of  São  Paulo.    Gravity  forces  the  flow  of  water  from  one  reservoir  to
another, and once the water reaches the Paiva Castro reservoir, located in the Juqueri River Basin, it is pumped to the Guaraú water treatment
plant.

Prior to February 2014 and the water crisis, this system supplied water to approximately 8.9 million people, with an average extraction of
up to 33 m³/s to serve the São Paulo metropolitan region. After the water crisis, when conditions returned to normal levels, this system supplies
water  to  approximately  7.8  million  people,  with  an  annual  average  extraction  of  up  to  25.1m³/s  in  2017  in  order  to  serve  the  São  Paulo
metropolitan region. The volume of water that may be extracted from the Cantareira System is now based on the volume of water available in
the reservoirs.  A minimum of 10 m³/s of water may be released to serve the metropolitan region of Campinas and Jundiaí, which is located
downstream from the reservoirs. This flow is defined in Joint Resolution nº 926/2017 and 925/2017, both dated May 29, 2017.

Water Inflow to the Cantareira System

During the October 2013 – March 2014 rainy season rainfall and water inflow levels into the reservoirs reached the lowest stream flow
measurements in over 80 years.  This drought persisted in the rainy season between October 2014 and March 2015.  During the October 2015
–  March  2016  and  during  the  October  2016  –  March  2017  rainy  season,  the  level  of  rainfall  in  the  region  returned  to  the  normal  levels
expected for the period and water inflow levels consequently improved. With the return of the rainfall to its historical average, the measures
taken during the water crisis to continue services to consumers were gradually discontinued.

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The table below sets forth water inflow (volume of water that flows into the reservoirs or natural inflow from the river basin), showing: 
(i) historical average and minimum flows; (ii) 1953, previously the driest year on record; (iii) inflow during the 2013-2014, 2014-2015 and
2015-2016  hydrological  years;  (iv)  inflow  during  the  2016-2017  hydrological  year;  and  (v)  inflow  during  the  2017-2018  hydrological  year
(through April 2018).

Oct.

Nov.

Dec.

Jan.

Feb.

March

April

May

June

July

Aug.

Sep.

For the month of

Water Inflow
Historical Average
Historical Minimum
Drought of 1953
2013/14
2014/15
2015/16
2016/17

2017/18

30.6
14.0
17.5
25.1
5.2
14.8
24.2
13.7

35.0
14.0
26.0
22.1
8.8
27.1
29.5
23.0

53.1
21.8
31.5
22.5
16.0
52.3
30.2
18.8

70.9
26.9
26.9
15.4
11.5
73.8
76.0
57.4

73.9
27.6
34.5
10.5
40.7
49.6
36.4
35.8

(in m³/s)

66.9
28.1
29.8
18.9
42.6
69.8
36.9
33.2

48.4
24.7
34.6
17.2
18.1
24.1
24.3
17.8

38.4
19.9
23.8
10.1
14.0
25.0
33.8

35.3
16.5
20.7
10.0
16.2
62.9
22.6

28.8
13.9
17.6
6.4
11.3
19.4
13.9

24.5
12.0
16.3
8.2
5.8
19.3
14.9

25.6
11.8
16.2
9.0
18.3
14.9
9.0

As a result of the drought and low water volume in the Cantareira System, DAEE and ANA regulated the volume of water we were

permitted to extract from this system from March 2014 to May 2017. However, in May 2017, the water right that regulates the volume of water
that may be extracted from the Cantareira System, the main water system we use to serve the São Paulo metropolitan region, based on the
volume of water available in the reservoirs was renewed. Under the new terms, the water we are permitted to draw from the system is divided
into five tranches:  (i) if the volume of water available is higher than 60% of the reservoirs’ capacity, we can draw up to 33m3/s; (ii) if the
volume of water is between 40% and 60% of the reservoirs’ capacity, we can draw up to 31m3/s; (iii) if the volume of water is between 30%
and 40% of the reservoirs’ capacity, we can draw up to 27m3/s; (iv) if the volume of water is between 20% and 30% of the reservoirs’ capacity,
we can draw up to 23m3/s; and (v) if the volume of water available is lower than 20% of the reservoirs’ capacity, we can draw up to 15.5m3/s.

As of December 31, 2017, the reservoirs in the São Paulo metropolitan region, where our largest market is located, contained 916.8
million m3 of water storage for treatment, compared to 951.1 million m3 available for treatment as of December 31, 2016. These figures do not
include the Cantareira System’s technical reserve of 287.5 million m³.

The following table shows the volume of water stored in the systems that serve the São Paulo metropolitan region as of December 2015,

March 2016, December 2016, March 2017, December 2017 and March 2018 at the end of the rainy season: 

March 2018

December 2017

March 2017

December 2016

March 2016

December 2015

For the month

Cantareira
Guarapiranga
Rio Grande
Rio Claro
Alto Tietê
Cotia

532.3
141.4
97.2
13.9
362.8
15.2

405.23
101.61
92.20
10.08
294.76
12.94

931.96
135.40
98.95
13.98
314.60
16.39

740.06
123.62
99.31
11.30
248.08
16.20

641.90
150.01
108.41
14.02
247.94
16.53

290.69
147.12
106.18
9.71
135.55
14.20

Total Storage
Capacity

1,269.5(1)(2)
171.19
112.18
13.67
573.81
16.50

(1)        

The Cantareira system’s total storage capacity is 982.0 million m³ available above the water intake level, plus 287.5 million m³ below the water intake level (known

as the “technical reserve”).

(2)        

Amounts included since the May 2017 water right renewal do not include the water from the Cantareira System’s technical reserve, which is water stored below the

water intake level. For more information, see “—Extracting Water from the Technical Reserve”.

In order to continue to meet consumer demand in the São Paulo metropolitan region and reduce water production in the Cantareira system
to  the  limits  set  by  ANA  and  DAEE,  we  adopted  the  following  measures  from  February  2014  to  early  2016  to  maintain  continuous  water
supply: 

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·         use of treated water from other production systems to serve consumers originally supplied by the Cantareira system;

·         implementation of a bonus program and contingency tariff;

·         reduction of pressure in pipes in order to decrease leakage;

·                 adjustment  to  the  volume  of  treated  water  sold  to  municipalities  that  operate  their  own  distribution  network,  due  to  the  reduced

availability of water; and

·         extraction of water from the technical reserve.

The  first  four  measures  resulted  in  significant  water  savings  and  helped  to  offset  the  reduced  volume  of  water  extracted  from  the
Cantareira  System.    The  extraction  of  water  from  the  technical  reserve  was  critical  to  maintaining  a  continuous  supply  of  water  to  the
population.

With  the  return  of  historical  average  rainfall  in  the  rainy  season  from  October  2015  to  March  2016,  water  levels  for  the  São  Paulo

metropolitan region returned to normal and we gradually discontinued the measures that we had taken during the water crisis.

The  rain  levels  and  water  inflows  into  the  reservoirs  that  supply  the  metropolitan  region  of  São  Paulo  during  the  October  2017-March
2018  rainy  season  were  below  the  historical  average.  However,  when  taking  into  account  accumulated  volume,  the  completion  of  the  São
Lourenço Project and the Jaguarí-Atibainha interconnection, and the lower level of water production due to the reduction in demand after the
water crisis, we believe that in terms of water security, the Metropolitan Region is prepared to face situations of similar magnitude as those
observed in 2014 and 2015.

Using Water from Other Production Systems to Serve Consumers Originally Supplied by the Cantareira System

The Cantareira System is part of the Integrated Water Supply System (Sistema Integrado de Abastecimento de Água), or SIM, of the São
Paulo  metropolitan  region  together  with  another  seven  production  systems  that  are  interconnected  through  a  system  of  large  water  mains
known  as  the  Metropolitan  Water  Main  System  (Sistema  Adutor  Metropolitano),  or  SAM.    The  SAM  transports  treated  water  to  regional
reservoirs.    From  there,  treated  water  is  distributed  to  the  population  through  distribution  networks.    This  system  serves  approximately  20
million people.

Throughout  the  years,  we  have  expanded  the  capacities  of  a  number  of  SIM  production  systems  and  major  SAM  water  mains,  which
further integrated the systems and, among other things, allowed water to be transferred from different production systems to areas that, under
normal conditions, would have been supplied by the Cantareira System.  The Alto Tietê and Guarapiranga systems contributed most to this
process.

The Guarapiranga System, with a storage capacity of 171 billion liters, maintained favorable levels of water availability for the duration of
the  drought  and  was  the  system  that  supplied  most  water  during  the  water  crisis,  serving  an  additional  1.4  million  people  in  the  south  and
southeast regions of the city of São Paulo who had previously been served by the Cantareira System.  As a result, the number of people served
by the Guarapiranga System increased from 3.8 million before the water crisis to 5.2 million during the crisis.  As of December 31, 2017, the
Guarapiranga System served a population of 4.4 million people.

Throughout 2014 and 2015, with the adoption of these measures, almost three million people who used to be served by the Cantareira
System began to be served by other systems.  As of December 31, 2017, the Cantareira System served 7.8 million people, compared to 8.9
million people before the drought. 

Bonus Program

In  February  2014,  we  implemented  a  water  consumption  reduction  incentive  program  based  on  a  bonus  system,  pursuant  to  which
customers served by the Cantareira System who achieve a 20% reduction in water consumption are entitled to a 30% discount on their service
bill.    Initially,  this  incentive  program  was  scheduled  to  last  seven  months  or  until  the  water  level  in  the  reservoirs  normalized  and  became
sufficient to supply the customers in the São Paulo metropolitan region served by the Cantareira System.

In April 2014, the incentive program was extended for the entire São Paulo metropolitan region until the end of 2014 or until the water
level in the reservoirs normalized.  In May 2014, the incentive program was extended to the municipalities we served in Piracicaba, Capivari
and the Jaguari River Basin in the Cantareira System catchment area, and remained in effect for invoices issued between June and December
2014.  This latter extension of the incentive program was suspended on April 17, 2015.

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In  October  2014,  we  implemented  changes  to  the  discount  ranges  in  the  bonus  program:    (i)  customers  who  reduced  their  water
consumption by 10-15% became entitled to a 10% discount on their service bill; (ii) customers who reduced their water consumption by 15-
20% became entitled to a 20% discount; and (iii) customers who reduced their water consumption by 20% or more became entitled to a 30%
discount.    

In  December  2014,  we  extended  the  Water  Consumption  Reduction  Incentive  Program  until  the  end  of  2015  or  until  reservoir  levels

normalized, whichever was to occur first.

In December 2015, we modified our bonus program by updating the reference value used to determine the discounts.  Prior to this change,
the reference value for the discounts was average consumption between February 2013 and January 2014.  In December 2015, we reduced the
reference  value  to  78%  of  the  prior  reference  value,  applicable  as  of  February  1,  2016.    The  bonus  ranges  previously  established  were
maintained.

On March 24, 2016, with the return of historical average rainfall and increased predictability of reservoir levels, we applied to ARSESP
for  cancellation  our  Water  Consumption  Reduction  Incentive  Program.    ARSESP  approved  this  request  on  March  31,  2016,  with  effect  on
water meter readings recorded as of May 1, 2016.  There have been no further updates since that date.

Contingency Tariff

In January 2015, ARSESP authorized us to implement a contingency tariff mechanism consisting of additions to water bills for customers
who did not reduce consumption.  Under this contingency tariff mechanism, increases of up to 20% above average consumption result in a
tariff increase of 40% and increases in consumption of more than 20% above average result in a tariff increase of 100%.

In  December  2015,  ARSESP  authorized  us  to  extend  the  contingency  tariff,  maintaining  the  current  rules  and  conditions  for  its

application, until December 31, 2016 or until inflows of water into our systems returned to predictable levels.

On March 24, 2016, with the return of historical average rainfall and increased predictability of reservoir levels, we applied to ARSESP
for cancellation of the Contingency Tariff.  ARSESP approved this request on March 31, 2016, with effect on water meter readings recorded as
of May 1, 2016.  There have been no further updates since that date.

Reducing Pressure in the Water Distribution Lines in order to Decrease Leakage 

Reducing water pressure in water distribution lines through operational maneuvers is a routine measure taken by sanitation companies to

reduce water losses.  We have been carrying out this measure in the São Paulo metropolitan region water supply network since 1997.

Due to the severity of the recent water crisis, during 2014 and 2015 we intensified measures to decrease water pressure in the water supply
network.  As a result, some areas of the São Paulo metropolitan region temporarily had less water availability during part of the day and night. 
The improvement of hydraulic and data transmission equipment allows us to monitor the volume of water used in a certain region in real time,
remotely gauge existing pressure in the local water distribution line, and reduce the volume of water loss from leakages, mitigating any effects
on water supply.

With the return of historical average rainfall beginning in October 2015, we returned to the normal pre-crisis policy of reducing pressure

only at night starting in December 2015. 

Adjusting the Volume of Treated Water Sold to Municipalities that Operate their own Distribution Network

One of the measures adopted to offset the decreased volume of water extracted from the Cantareira System was to reduce the volume of
water transferred to municipalities located in the area covered by the Cantareira System that we serve on a wholesale basis.  The volume of
water  transferred  was  reduced  by  almost  2  m³/s  during  the  water  crisis.   As  the  situation  improved,  the  volume  of  water  provided  to  these
municipalities was restored.

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Extracting Water from the Technical Reserve

When our simulations indicated that the working volume of the Cantareira System would be depleted before the following rainy season,
we obtained an authorization from ANA and DAEE to use part of the water from the Cantareira System’s technical reserve, which is water
stored below the water intake level.  

Water from the technical reserve had never been used before.  As a result, we built dams, water lines, water pipe facilities, and floating
pumps to extract this water.  We began using the first layer of the technical reserve, totaling 187 billion liters of water, in mid-May 2014, and
the  second  layer,  totaling  105  billion  liters  of  water,  at  the  end  of  October  2014.    With  the  return  of  normal  rainfall  in  the  October  2015  –
March 2016 rainy season, the technical reserve was fully restored in December 2015. We have reserved the right to access the technical reserve
in our operational contingency plan in case this action becomes necessary again in the future.

Emergency Projects and Projects Implemented to Meet the Water Demand of the São Paulo Metropolitan Region

In addition to the measures discussed above, we made and continue to make short and medium-term investments in projects to increase

water availability, transfer water between different reservoir systems and expand water treatment production capacity.

Our production of treated water was expanded by 8.6 m³/s with the completion of the São Lourenço Project. In addition, an additional 13
m³/s was made available to our reservoirs through interconnections to other reservoirs in the state of São Paulo, which will be available to us if
reservoirs levels once again become low. Completion of these projects results in improved water security for the SIM.

The main projects include:

·  

·  

·  

·  

·  

·  

Alto Tietê System – transfer of an additional 1 m³/s from the Guaió River to the Taiaçupeba reservoir, in order to recover the reserve
volume of the Alto Tiête System.  This project was concluded in June 2015.

Alto Tietê System – transfer of additional up to 4.0 m³/s from Rio Grande - Billings reservoirs to the Alto Tietê System.  This project was
concluded in September 2015.

Guarapiranga  System  –  transfer  of  an  additional  1  m³/s  of  which  results  from  the  expansion  of  the  transfer  capacity  of  the  Billings
reservoir to the Guarapiranga reservoir. This project was concluded in December 2015. 

Interconnection  of  the  Jaguari  and  Atibainha  reservoirs  –  the  purpose  of  this  project  is  to  recover  water  levels  and  increase  the  water
security  of  the  Cantareira  System.    The  interconnection  increases  water  availability  in  the  Cantareira  System  by  5.13  m³/s  (annual
average)  to  8.5  m³/s  (maximum)  by  transferring  water  from  the  Jaguari  reservoir  to  the  Atibainha  reservoir.    Construction  of  the
interconnection  began  in  February  2016  and  was  completed  in  March  2018.  Upon  completion  of  construction,  we  began  transferring
water from the Jaguari reservoir (part of the Paraíba do Sul Basin) to the Atibainha reservoir (part of the PCJ River Basin). For more
information, see “Item 4.A. History and Development of the Company—Capital Expenditures Program”.

Alto  Tietê  System  –  transfer  of  an  additional  average  1.9  m³/s  and  up  to  2.5  m³/s  from  the  Itapanhaú  river  to  the  Biritiba  reservoir,
providing more volume to the Alto Tietê System.  This project is currently under development and is expected to be concluded in 2019.

Implementation of the São Lourenço Production System – this project was commenced in April 2014 and was completed in April 2018.
Upon completion in April 2018, pre-operation commenced.  This system has an average water treatment capacity of 6.4 m3/s.  For more
information, see “Item 4.A. History and Development of the Company—Capital Expenditures Program”.

The Drought Committee

On February 3, 2015, the State approved Decree No. 61,111, which established  the Drought Committee for the São Paulo metropolitan
region (Comitê  de  Crise  Hídrica  no  Âmbito  da  Região  Metropolitana  de  São  Paulo),  or  Drought  Committee,  as  coordinated  by  the  State
Department  for  Sanitation  and  Water  Resources  (Secretaria  de  Saneamento  e  Recursos  Hídricos).  The  Drought  Committee  holds  meetings
when necessary.

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The Drought Committee’s main purposes are exchanging information and planning joint actions between its members in relation to the
drought affecting regions in the state.  The Drought Committee shall be composed of the Secretaries of (a) Sanitation and Water Resources
(who shall chair the Drought Committee); (b) Chief of Staff; (c) Health; (d) Public Security; (e) the Environment; (f) Agriculture and Supplies;
(g)  Energy;  and  (h)  the  State  Coordinator  of  Civil  Defense.    In  addition,  if  invited,  the  following  parties  may  also  compose  the  Drought
Committee:  the mayors of São Paulo and Campinas, as well as the Chairmen of (a) the Intermunicipal Greater ABC Consortium (Consórcio
Intermunicipal  do  Grande  ABC);  (b)  the  Development  Consortium  of  the  Alto  Tietê  Municipalities  (Consórcio  de  Desenvolvimento  dos
Municípios  do  Alto  Tietê);  (c)  the  Intermunicipal  Consortium  of  the  Juqueri  Basin  (Consórcio  Intermunicipal  dos  Municípios  da  Bacia  do
Juqueri); (d) the Intermunicipal Consortium of the Western Region of the São Paulo Metropolitan Area (Consórcio Intermunicipal da Região
Oeste  Metropolitana  de  São  Paulo);  and  (e)  the  Intermunicipal  Consortium  of  the  Southeast  Region  of  Greater  São  Paulo  (Consórcio
Intermunicipal  da  Região  Sudeste  da  Grande  São  Paulo).    Representatives  of  professional  associations,  civil  society  groups  and  public
administration  entities  may  also  be  included  in  the  Drought  Committee  by  means  of  invitations.    The  State  Chief  of  Staff  will  monitor  the
Drought Committee.

In  order  to  fulfill  its  purposes,  the  Drought  Committee  will  be  in  charge  of:    (i)  providing  the  mayors  of  the  respective  São  Paulo
metropolitan cities and the users of the water system with information regarding  the status of the water systems, the severity of the water crisis
and the decisions made on a governmental level regarding the water supply, in order to provide sufficient time for adaptation; (ii) examining
alongside  the  city  mayors  the  need  to  implement  restrictions  on  the  use  of  drinking  water  for  purposes  other  than  human  consumption  and
animal  consumption,  by  means  of  enacting  local  law;  (iii)  obtaining  from  the  city  mayors  information  necessary  to  update  and/or  amend
contingency plans; and (iv) communicating to the public measures and risks related to restrictions on the supply of drinking water.

Marketing Channels

As of December 31, 2017, we were the concessionaire for the provision of water supply and collection, treatment and disposal of sewage
services  directly  to  end  consumers  for  368  municipalities  in  the  state  of  São  Paulo.    We  also  supply  water  on  a  wholesale  basis  to  five
municipalities located in the São Paulo metropolitan region.  It is the responsibility of these municipalities to then distribute the water to end
consumers.  We provide sewage services to four of these municipalities.  Because of our distribution infrastructure, end consumers to whom
we  offer  water  services  on  a  wholesale  basis  cannot  alternatively  acquire  such  services  directly  from  us.    For  more  information  on  service
concessions, see ”—Wholesale Operations”.

Energy Consumption

Energy is essential to our operations, and as a result we are one of the largest users of energy in the state of São Paulo.  In the year ended
December  31,  2017,  we  used  approximately  1.79%  of  the  total  energy  consumption  in  the  state  of  São  Paulo.    To  date,  we  have  not
experienced any major disruptions in energy supply.  Any significant disruption of energy to us could have a material adverse effect on our
business, financial condition, results of operations or prospects.  Energy prices have a significant impact on our results of operations.  In 2017,
we purchased approximately 54% of our total energy consumption in the “free market,” where we can more efficiently negotiate the supply of
energy; and the remainder of our energy consumption comes from the Regulated Market. This allowed us to save approximately R$158 million
in 2017, compared to what we expect we would have spent if we purchased all of our total energy consumption in the Regulated Market. 

Most  of  the  energy  produced  in  Brazil  comes  from  hydroelectric  power  plants.  For  more  information  on  energy,  see  “Item  3.D.  Risk

Factors—Risks Relating to Our Business—We are exposed to risks associated with the provision of water and sewage services”.

Insurance

We maintain insurance covering, among other things, fire or other damage to our property and office buildings and third‑party liability. 
We  also  maintain  insurance  coverage  for  directors’  and  officers’  liability  (D&O  insurance).    We  currently  obtain  our  insurance  policies  by
means of public bids involving major Brazilian and international insurance companies that operate in Brazil.  As of December 31, 2017, we
had paid a total aggregate amount of R$4.7 million in premiums.  In addition, we paid R$1.6 million for a D&O insurance policy, covering
R$3.7 billion in assets, third‑party liabilities and D&O insurance.  We do not have insurance coverage for business interruption risk because
we do not believe that the high premiums for such insurance are justified by the low risk of major interruption of our activities.  In addition, we
do not have insurance coverage for liabilities arising from water contamination or other problems involving our water supply to customers and
for  environmental  related  liabilities  and  damages.    We  believe  that  we  maintain  insurance  at  levels  customary  in  Brazil  for  our  type  of
business.

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Intellectual Property

Trademarks

We have secured registration of our logo and composite trademark (“Sabesp”) at the Brazilian Institute of Industrial Property (Instituto
Nacional  da  Propriedade  Industrial),  or  INPI.  In  addition,  we  have  registered  with  the  INPI  several  other  trademarks,  such  as:  “Sabesp
Soluções Ambientais”, “Projeto Tietê”, “Programa Córrego Limpo”, “Programa Onda Limpa”, “Prol – Programa de Reciclagem do Óleo de
Fritura”, “Revista DAE”, “Ligação Sabesp”, “Agente da Gente – Sabesp na Comunidade”, “PURA – Programa de Uso Racional da Água”,
“Sabesp Inteligência Ambiental”, “Reúso de Água”, “Uso Racional da Água”, “Parque da Integração”, “Sabesp Semana do Meio Ambiente”,
“Água Sabesp Aquífero Guarani”, “Água Sabesp Estação Cantareira”, “Contrato de Fidelização Sabesp”, “Esgoto não Domésticos Sabesp”,
“PEA – Programa de Educação Ambiental – Sabesp”, “Sabesp Abraço Verde”, “Água de Reúso Sabesp”, “Eu Sou Guardião das Águas Sabesp
Eu Não Desperdiço”, “Calculadora de Sonhos”, “Parque Sabesp Mooca”, “Parque Sabesp Butantã”, “Parque Sabesp Cangaíba” and “Clubinho
Sabesp”,  which  is  a  tool  for  environmental  education  directed  to  children  through  our  website,  and  of  its  characters:    “SuperH2O”,  “Gota
Borralheira”, “Gotucho”, “Ratantan”, “Dr. Gastão”, “Cauã”, “Denis”, “Gabi”, “Iara”, “Sayuri”, and “Cadu”.

We have also filed applications with the INPI for registration of the following trademarks: “Signos Sistema de Informação Geográfica no

Saneamento”, “Acertando suas contas com a Sabesp”, “Sistema de Suporte a Decisões Sabesp” and “Programa Água Legal Sabesp”.

Patents

We have a patent granted by the INPI for a device for the removal of supernatants during the sewage treatment process. Our patent for a
constructive  device  in  a  building  hydraulic  simulator  used  for  didactic  purposes  has  expired  and  therefore,  the  rights  associated  with  such
patent have fallen into the public domain.  We have also filed patent requests for the following additional devices:

·         a biofilter odor control unit;

·         rotary devices used to clean water reservoirs transported by trucks with high-pressure hydrojetting systems;

·         a digital leakage detection system;

·         a chemical composition sensor, its fabrication process and use to measure pH in microfluid systems; and

·         a bubble removal system, autonomous microlaboratory and use of autonomous microlaboratory to monitor water quality.

We are currently awaiting responses to our patent requests from the INPI.  While the requests are under consideration, we are granted the

exclusive right to use these devices.

Software

We  have  adopted  an  internal  policy  that  provides  for  an  active  and  effective  audit  and  prevention  of  unauthorized  software.    We  have

acquired the software licenses for all our workstations.

We have also developed certain computer programs for management and control of water and sewage treatment facilities, as well as for
third‑party services management, called “AQUALOG” (Control Water Treatment Plants), “SGL” (Bid Management System), “SCORPION”
(Software  to  Operational  Control),  “Electronic  Price  Quotation”,  “PREGÃO  SABESP  ONLINE”,  “SISDOC”  (Document  Control  System),
“system for analyzing the metrological behavior of water meters”, “MPLT” (Standardized Model of Technical Report), “SGH” (Hydrometry
Management  System),  “SAI”  (Audit  Information  System),  “CSI”  (Business  System:  Information  Services),  “NETCONTROL”  (Automation
System  of  Sanitary  Control  Laboratories),  “SACE”  (External  Commercial  Service  System),  “SAN”  (Navigation  Support  System),  “online
software  for  managing  specific  articles  published  in  the  DAE  magazine”,    “Dashboard  panel”,  “COP”  (Online  Control  of  Water  Losses),
“GEL” (Power Management System), “CADGEO”, “LIGGEO”, “Intellectual Property Management System”, “SOE” (Business Organization
System) and “Application for Predicting the Concentration of Cyanobacteria through Artificial Intelligence”. 

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Among them, we highlight:

·                  AQUALOG  is  a  software  designed  to  monitor  water  treatment  through  the  employment  of  artificial  intelligence.    In  2001,  we
completed the first rendering of services based on the AQUALOG software to a third party with the automation of a water treatment
plant in the city of Jaguará do Sul, State of Santa Catarina.  We have entered into an agreement to license the software to Sanesul, in
the state of Mato Grosso do Sul and to Teuto’s drugs factory, in the city of Anapólis, state of Goiás.

·         SGL is an electronic price quotation system that allows us to view and control all bid and acquisition proceedings in real time.

·                  CADGEO  and  LIGGEO  are  computer  programs  used  to  locate  the  water  and  sewage  infrastructure  in  times  of  installation,

maintenance or expansion in real time via satellite.

·        “Application for Predicting the Concentration of Cyanobacteria through Artificial Intelligence”, is an application that was developed
as a result of a joint research project by us, the São Paulo State Foundation for Research Support (Fundação de Amparo à Pesquisa do
Estado de São Paulo – FAPESP) and the Federal University of São Paulo – UNIFESP.

We have also registered all of these programs at the INPI.

Domain Names

We own the domain names described below which have been registered with the relevant entity in Brazil, Registro.br:

·         www.sabesp.com.br;

·         www.corregolimpo.com.br;

·         www.projetotiete.com.br;

·         www.revistadae.com.br;

·         www.blogdasabesp.com.br;

·         www.blogsabesp.com.br;

·         www.sustentabilidadesabesp.com.br;

·         www.inovasabesp.com.br;

·         www.ondalimpa.com.br;

·         www.programaondalimpa.com.br;

·         www.clubinhosabesp.com.br; and

·         www.superh2o.com.br.

Environmental Matters

Our environmental management, which is guided by the directives established in our environmental policy, is inherent to the provision of
our  services  and  the  essence  of  our  business.    In  order  to  consolidate  our  environmental  culture,  we  prioritize  the  internal  and  external
dissemination  of  knowledge  and  experience  on  the  best  environmental  practices.    There  are  actions  of  our  environmental  management
corporate  program  that  rely  on  the  involvement  of  collaborators,  the  communities  we  service  and  partnerships  with  non-governmental
organizations.

We have the following ongoing environmental management programs:

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·         development of the Corporate Greenhouse Gas Management Program (Programa Corporativo de Gestão de Emissões de Gases de
Efeito Estufa),  in  line  with  the  guidelines  from  the  São  Paulo  State  Climate  Change  Policy  (PEMC),  including  the  preparation  of
inventories of greenhouse gases, totaling 10 inventories concluded since 2007;

·         continuation of the actions set forth in the corporate programs for obtaining and maintaining environmental licenses and grants for

the right to use water;

·                 the Environmental Education Program (PEA-SABESP), an important tool for the effectiveness of our sanitation activities, which
propitiates  connections  with  the  communities  we  service  through  over  a  hundred  environmental  education  projects.   The  activities
developed by the PEA are organized with the following objectives:  increment the intrinsic value of water; protect the environment;
preserve the streams; improve the quality of the environment; valorize sanitation activities; valorize the conscious use of water; direct
capacitation and production of guiding material;

·         Management of our institutional representation in the State and National Systems of Water Resources, including training of company
representatives to participate in: (i) the creation of criteria for water usage charges, (ii) the monitoring of river basin plans (Planos de
Bacias), (iii) review of water bodies’ classifications, and (iv) analysis of legislations regarding the protection of water sources;

·         the SABESP 3‑Rs Program (Programa SABESP 3Rs) for the reduction, re‑use and recycling of waste from administrative activities,
in  partnership  with  waste  and  recycling  collecting  cooperatives  and  which  includes  employee  training  enabling  them  to  act  as
multipliers in the roll-out of the program;

·                  the  progressive  implementation  and  maintenance  of  the  Environmental  Management  System  (EMS)  in  our  water  and  sewage
treatment plants.  The EMS is currently in place in 177 treatment plants, 35 of which are ISO 14001 certified.  There are perspectives
of implementing the EMS in all stations by 2024, whereby the scope of 14001 certification may be expanded according to the strategy
of the Business Units, which scope is evaluated annually by means of external audits. Since 2015, we have been working on the EMS
with  a  mixed  model,  whereby  the  ISO  14001  standard  is  applied  to  the  certified  scope,  while  the  other  stations  adopt  their  own
environmental management model (named SGA-SABESP); and

·         in the development of our activities related to the execution of works and interventions, we go through a process of obtaining permits
and  environmental  licenses,  according  to  the  current  legislation.  As  a  result  of  these  processes,  we  undertake  environmental
compensation commitments. In order to meet our current and future obligations, we developed and are implementing a program that
includes the planting and the maintenance of 1 million seedlings in the next ten years. The work has already started and is included
within the context of the “Programa Nascentes” of the Government of the State of São Paulo. Currently, 213 thousand seedlings have
already been planted and are being maintained in the Cantareira System and in the surrounding area of the Cachoeira Reservoir. The
planting  and  maintenance  of  another  168  thousand  seedlings  has  already  been  contracted  for  in  the  municipalities  of  Igaratá  and
Mirante do Paranapanema. We are also in the process of contracting, planting and maintaining another 350 thousand seedlings in the
Cantareira System, further expanding forest coverage in the area.

In  addition  to  corporate  environmental  management  initiatives,  we  have  several  projects  and  initiatives  underway  to  benefit  the
environment  by  engaging  the  population  at  large.    In  2017,  we  invested  R$19.9  million  in  environmental  programs  and  projects  directly
concerned with the development and implementation of corporative environmental management programs as well as the Program for Rational
Use  of  Water  (Programa  de  Uso  Racional  da  Água  –  PURA),  among  other  environmental  initiatives  with  a  local  scope  executed  by  our
Business Units. 

Other  investments  and  expenses  associated  with  environmental  protection  are  included  in  the  total  value  of  operational  expenses  and
investments  mentioned  in  this  annual  report,  due  to  the  direct  relationship  of  our  environmental  activities  with  our  overall  purpose.  For
example, we have made, among others, significant investment in sewage, effluent monitoring, payment for the use of water in federal and state
water bodies, maintenance of reserves in protected areas, environmental education actions.

Climate Change Regulations:  Reduction of Greenhouse Gases (GHG) Emissions

We are required to comply with laws and regulations related to climate change, including international agreements and treaties to which

Brazil is a signatory.

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The São Paulo State Climate Change Policy (Law No. 13,798/2009), enacted on November 9, 2009, and regulated by Decree No. 55,947
of June 24, 2010, aims to reduce global emissions of carbon dioxide by 20.0% by 2020 compared with 2005 levels.  Brazil’s Climate Change
Policy  (Law  No.  12,187/2009),  enacted  on  December  29,  2009  and  regulated  by  Decree  No.  7.390/2010  establishes  a  voluntary  national
commitment to reduce Brazil’s currently projected GHG emissions for 2020 by a percentage between 36.1% and 38.9%.  Such targets have not
been established for the sanitation sector yet.  In this sense we are currently developing a Corporate Greenhouse Gas Management Program,
aimed at reducing the amount of greenhouse gases released into the atmosphere, including the creation of an inventory to record releases of
greenhouse gases.

In 2017, we concluded the corporate inventory of greenhouse gases for 2016, thus totaling ten inventories since 2007. We noted that the
trend  observed  in  the  previous  inventories  persists,  specifically  that  activities  regarding  sewage  collection  and  treatment  remain  our  largest
sources of greenhouse gas release, representing approximately 89% of total greenhouse gas release.  Electric energy represents approximately
9% and other activities represent approximately 2%.

We  have  projects  in  the  research  and  development  stages  that  entail  using  biogas  generated  in  the  treatment  of  sewage  and  recycling
sewage sludge as a possible way to reduce the gases released in the treatment processes.  We also have initiatives to reduce our emission of
greenhouse gases, such as the coverage of stabilization ponds and the implementation of composting systems. 

At this point, it is still not possible to predict if climate change policies will provide opportunities or generate new costs for us.  Reducing
our  emissions  of  carbon  dioxide  will  involve  costs  and  expenses  related  to  implementing  more  stringent  control  mechanisms,  adopting
pollution prevention measures and actions to minimize the generation of GHGs.  We may not receive financial incentives to offset all or part of
these costs.  In addition, if limitations in GHG emissions affect our supply chain and increase our costs, we may not be able to pass on these
costs to our end consumers.  See “—Tariffs”.

Physical Effects of Extreme Weather Events

Since our financial performance is closely linked to climate patterns that influence the qualitative and quantitative availability of water,
extreme weather conditions may cause adverse effects on our business and operations.  Long-term effects of extreme weather conditions cause
significant  alterations  in  the  physical  environment  that  may  create  unfavorable  circumstances,  which  could  affect  the  costs  of  services  and
tariffs.

An increase in heavy rainfall can impact the regular operation of water sources, including abstraction of water from our dams, through
potential increased soil erosion, silting and runoff of pollutants that can affect aquatic ecosystems.  In addition, increased flows of rainwater
into sewage systems may overwhelm the capacity of sewage treatment plants. 

In  the  case  of  prolonged  periods  of  drought,  for  example,  reduced  water  levels  in  dams  can  greatly  impact  the  production  process. 
Droughts  also  lower  reservoir  levels  available  for  hydroelectric  plants,  which  may  lead  to  power  shortages,  particularly  since  hydroelectric
power  accounts  for  most  of  Brazil’s  electric  power  supply.    Lack  of  electric  energy  could  lead  to  instability  in  water  supply  and  sewage
collection and treatment services, which could damage our reputation.  In addition, because we are one of the largest consumers of electricity
in the state of São Paulo, a potential increase in electricity tariffs due to a shortage of hydroelectric power could have a significant economic
impact on us.

We are also the concessionaire for water and sewage services for all the coastal municipalities of the state of São Paulo.  A rise in the sea
level could result in increased salinity in the river estuaries where we abstract water, which could affect water treatment in these areas.  Rising
sea levels could also cause damage in our sewage collection network.

Extreme climate events may also affect the extraction, production and transportation of the materials necessary for our operations, such as
water  treatment  materials,  and  may  lead  to  an  increase  in  the  cost  of  these  materials.    A  drastic  rise  in  air  temperature  could  also  increase
consumer demand for water, increasing the need to expand both water supply and sewage treatment.

In  this  context,  our  strategy  calls  for  identifying  mitigating  actions  and  enlarging  their  coverage  in  the  areas  we  operate  in,  as  well  as
identifying  opportunities  to  increase  our  effectiveness  and  to  implement  new  technologies.    With  regard  to  the  risk  of  reduced  water
availability, we are working to adapt to a new scenario of water scarcity due to the risks associates with the effects of climate change through
initiatives  such  as  the  Corporate  Programs  for  Reduction  of  Water  Loss,  the  Program  for  Rational  Water  Usage  and  the  expansion  of  the
planned reutilization of effluents for urban and industrial purposes, among others. 

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See  “Item  3.D.  Risk  Factors—Risks  Relating  to  Our  Business—New  laws  and  regulations  relating  to  climate  change  and  changes  in
existing regulation, as well as the escalation of the physical effects of extreme weather events, may result in increased liabilities and increased
capital expenditures, which could have a material adverse effect on us”.

Public Bidding Procedures

Pursuant to the Federal Public Bidding Law, the public bid process commences with publication by the granting authority in a federal,
state  or  municipal  official  newspaper,  as  the  case  may  be,  and  another  leading  Brazilian  newspaper.    The  publication  announces  that  the
granting authority will carry out a public bidding contest pursuant to provisions set forth in an edital (invitation to bid).  The invitation to bid
must specify, among other terms:  (i) the purpose, duration and goals of the bid; (ii) the participation of bidders, either individually or forming
a consortium; (iii) a description of the qualifications required for adequate performance of the services covered by the bid; (iv) the deadlines
for the submission of the bids; (v) the criteria used for the selection of the winning bidder; and (vi) a list of the documents required to establish
the bidder’s technical, financial and legal capabilities.

The  invitation  to  bid  is  binding  on  the  granting  authority.    Bidders  may  submit  their  proposals  either  individually  or  in  consortia,  as
provided for in the invitation to bid.  After receiving proposals, the granting authority will evaluate each proposal according to the following
criteria, which must have been set forth in the invitation to bid:

·         the technical quality of the proposal;

·         lowest cost or lowest public service tariff offered;

·         a combination of the criteria above; or

·         the largest amount offered in consideration for the concession.

The provisions of State Law No. 6,544/1989 of November 2, 1989, as amended, or the State Public Bidding Law, parallel the provisions of
the Federal Public Bidding Law.  The Federal and State bidding laws will apply to us in the event that we seek to secure new concessions. 
Moreover, these bidding laws currently apply to us with respect to obtaining goods and services from third parties for our business operations
or in connection with our capital expenditure program, in each case subject to certain exceptions.

On June 30, 2016, Federal Law No. 13,303/16 came into force in Brazil.  This law sets new corporate governance standards for Brazilian
government-owned and mixed capital companies like our company, as well as their subsidiaries.  Federal Law No. 13,303/16 also sets new
rules  that  these  companies  must  follow  in  public  bidding  procedures  and  when  contracting  third  parties.  We  are  working  to  implement  the
requirements of this federal law and expect to conclude the implementation process by June 30, 2018.

Water Usage

State  law  establishes  the  basic  principles  governing  the  use  of  water  resources  in  the  state  of  São  Paulo  in  accordance  with  the  State

constitution.  These principles include:

·         rational utilization of water resources, ensuring that their primary use is to supply water to the population;

·         optimizing the economic and social benefits resulting from the use of water resources;

·         protection of water resources against actions which could compromise current and future use;

·         defense against critical hydrological events which could cause risk to the health and safety of the population or economic and social

losses;

·         development of hydro‑transportation for economic benefit;

·                  development  of  permanent  programs  of  conservation  and  protection  of  underground  water  against  pollution  and  excessive

exploitation; and

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·         prevention of soil erosion in urban and rural areas, with a view to protecting against physical pollution and silting of water resources.

Among other instruments established by the State Water Policy, Law No. 7,663 of December 30, 1991, the competent public authority
grants for the right to use water for the implementation of any enterprise that demands the use of surface or underground water resources (for
water collection and release of effluents), as well as for the execution of services that alter the regime or quality of such water resources.  In the
case  of  rivers  under  the  federal  government’s  domain  (rivers  crossing  more  than  one  state),  ANA  is  the  public  authority  which  grants  the
authorization.  With respect to the rivers under a state’s domain, the applicable state authority has jurisdiction to grant the right of use.  In the
state of São Paulo, DAEE is the public authority responsible for granting such authorizations. 

In  conducting  our  principal  activities,  we  have  the  majority  of  grants  for  the  rights  to  use  water,  and  there  is  a  multi-annual  corporate
program in place to obtain and maintain the rights to use water for the remaining activities.  However, all of our water-usage activities included
in the corporate program have filed requests for grants for the right to use water with the competent authority; many of these requests have
been granted and others are under analysis by DAEE and ANA.  Another phase of the corporate program is predicted to meet new demands.

State  Law  No.  12,183/2005,  which  was  enacted  on  December  29,  2005,  established  the  basis  for  charging  for  the  use  of  the  water
resources under the domain of the State of São Paulo.  To apply such charging, the law provides for, among other provisions, the participation
of  the  River  Basins  Committees,  the  formulation  of  criteria  by  such  committees,  the  creation  of  basin  agencies  and  the  organization  of  a
registered list of water resource users.  The basin committee’s proposals regarding the criteria to calculate the amounts to be charged at each
basin must be approved by the State Water Resource Council, and formalized by a decree issued by the State Governor.

According  to  existing  law,  the  hydrographic  basins  committees  are  authorized  to  charge  users,  such  as  us,  for  the  abstraction  of  water

from, or dumping of sewage into, water bodies.

Charging  for  the  use  of  water  is  under  gradual  implementation  by  the  State  of  São  Paulo,  where  the  largest  individual  contributors  are
located, and it is a management tool of the Policy on Water Resources to promote the rational use of water and finance programs and actions
established by the basin plans.  In 2017, we paid approximately R$60.8 million for the use of water resources.

Charging for the use of water from rivers of federal domain began in 2003 in the Paraíba do Sul basin, and charging for the use of water
from  rivers  of  state  domain  began  in  2007  in  the  Paraíba  do  Sul,  Piracicaba,  Capivari  and  Jundiaí  basins.    Subsequently,  charges  were
implemented  for  the  use  of  water  from  the  Sorocaba,  Baixo  Tietê,  Médio  Tietê  and  Baixada  Santista  river  basins.    In  2014,  charges  were
implemented for the use of water from the Alto Tietê river basin, and in 2016, from the Tietê / Batalha, Tietê / Jacaré and Ribeira de Iguape
river basins. In 2017, charges were implemented for the use of water from the Sapucaí Mirim/Grande, Baixo Pardo/Grade, Mogi Guaçu and
Pardo river basins.  It is probable that the same will occur in 2018 in the other river basins of the State of São Paulo.

Water Quality

Attachment XX of the Consolidation Administrative Rule No. 5 from September 28, 2017, issued by the Ministry of Health of the federal
government, provides the standards for potable water for human consumption in Brazil.  This rule is similar to the U.S. Safe Drinking Water
Act  and  the  regulations  enacted  by  the  U.S.  Environmental  Protection  Agency,  which  establishes  rules  for  sampling  and  limits  related  to
substances that are potentially hazardous to human health.

In compliance with Brazilian law, the physical‑chemical, organic and bacteriological analyses carried out for water quality control must
follow  several  national  and  international  standards,  such  as:    Standard  Methods  for  the  Examination  of  Water  and  Wastewater  from  the
institutions such as the American Public Health Association (APHA), American Water Works Association (AWWA) and Water Environment
Federation  (WEF);  United  States  Environmental  Protection  Agency  (EPA);  standards  published  by  the  International  Standardization
Organization (ISO); and methodologies proposed by the World Health Organization (WHO).

Decree No. 5,440/2005 provides that the quality of water must be disclosed to consumers.  We have been complying with this regulation

by publishing the required information in monthly bills and annual reports delivered to all consumers that we serve.

Environmental Regulation

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The implementation and operation of water and sewage systems are subject to strict federal, state and municipal laws and regulations on
environmental  and  water‑resource  protection.    The  National  Environmental  Council  (Conselho  Nacional  de  Meio  Ambiente),  or  the
CONAMA, is the federal agency responsible for the regulation of potentially polluting activities.  In the state of São Paulo, CETESB is the
governmental  entity  responsible  for  the  control,  supervision,  monitoring  and  licensing  of  polluting  activities,  pursuant  to  State  Law
No. 997/1976 and State Law No. 13,542/2009. 

The  control  and  environmental  planning  instruments  are  defined  by  several  legal  instruments,  such  as  State  Law  No.  997/1976,  which
regulates  environmental  pollution  control;  CONAMA  Resolution  No.  05/1988,  which  requires    licensing  of  sanitation  projects  that  cause
significant  alterations  to  the  environment;  Complementary  Law  No.  140/2011  CONAMA  Resolution  No.  237/1997,  which  regulates
(i) environmental licenses; (ii) federal, state and local jurisdiction over environmental issues; (iii) the list of activities subject to licensing; and
(iv) environmental impact studies and reports; State Decree No. 8,468/1976, State Decree No. 47,400/2002 and related articles from State Law
No.  9,509/1997  regarding  environmental  licensing;  State  Decree  No.  8,468/1976,  CONAMA  Resolution  No.  357/2005,  which  establish
standards of quality for receiving bodies of water; State Decree No. 8,468/1976 and CONAMA Resolution No. 430/2011 which establish the
standards  for  discharge  of  effluents;  and  DAAE  Ordinance  No.  1,630/2017  and  ANA  Resolution  No.  1,941/2017,  which  regulate  the
concession of grants for the right to use water and interfere in water resources on the State and federal level, respectively.

The licensing process, usually, is composed of three stages, including the following licenses:   

·         preliminary license – granted in the planning stage, approving the location and concept and attesting to the project’s environmental

feasibility;

·         installation license – authorizing the beginning of works for the installation of the project, subject to compliance with approved plans,

programs and projects, including environmental control measures and other necessary technical requirements; and

·         operation license – authorizing the operation of a unit or activity, subject to compliance with the technical requirements contained in

the installation license.

There  are  cases,  according  to  the  type  of  business  to  be  licensed,  in  which  the  preliminary  license  may  be  issued  with  the  installation

license.  The environmental licenses are renewable.

Projects with significant environmental impact are subject to specific studies prepared by multidisciplinary teams that present a series of
recommendations  focused  on  minimizing  the  environmental  impact.    These  studies  are  then  submitted  for  analysis  and  approval  by  the
government authorities. 

We  have  a  multi-annual  corporate  program  to  obtain  and  maintain  the  environmental  licenses  for  our  water  treatment  plants,  sewage

treatment plants and sewage pumping stations in order to comply with environmental regulations.

Sewage Requirements

State law sets forth regulations regarding pollution control and environmental preservation in the state of São Paulo.  According to this
law, in areas in which there is a public sewage system, all effluents of a “polluting source” must be discharged to such system, as is the case for
industrial  enterprises.    It  is  the  responsibility  of  the  polluting  source  to  connect  itself  to  the  public  sewage  system.    All  effluents  to  be
discharged are required to meet the standards and conditions established by the applicable environmental law, which allows such effluents to
be treated by our treatment facilities and discharged in an environmentally safe manner.  Effluents that do not comply with such criteria are
prohibited from being discharged into the public sewage system.  State legislation also establishes that liquid effluents, except those related to
basic sanitation, be subjected to pre‑treatment so that they meet the required mandatory levels before being discharged into the public sewage
system.  Effluents from our treatment facilities must comply with effluent limitation guidelines and meet the water quality standards of the
receiving water bodies established by federal and state legislation.  See “—Sewage Operations—Sewage System”.

The CETESB is authorized under State law to monitor discharges of effluents into the water bodies, among other things.  The CETESB
also  issues  the  environmental  licenses  to  the  polluting  sources,  including  sewage  treatment  plants.    For  more  information,  see  “—
Environmental Matters”.

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State and federal water resource legislation establishes the charging of fees for the discharge of treated effluents into water bodies.  This
charge is already in force for some river basins, and it is in different implementation stages for the remaining basins.  See “—Environmental
Matters—Water Usage”.

Governmental Restrictions on Incurrence of Debt

On June 29, 1998, the CMN issued Resolution No. 2,515/1998 amending certain conditions that must be observed with respect to external
credit operations (i.e., foreign currency borrowings) of states, the Federal District of Brasília, municipalities and their respective autarquias
(agencies), foundations and non‑financial companies,  including us.  This resolution provides, among other things, that, with certain exceptions
applicable to the importation of goods and services:

·         the proceeds of external credit operations must be exclusively used to refinance outstanding financial obligations of the borrower,
with preference given to those obligations that have a higher cost and a shorter term, and, until used for such purposes, the proceeds
shall remain deposited, as directed by the Central Bank, in a pledged account; and

·         the total amount of the contractual obligation must be subject to monthly deposits in a pledged account, equal to the total debt service

obligation, including principal and interest, divided by the number of months that the obligation is to be outstanding.

The CMN resolution further provides that the requirements described above do not apply to financing transactions involving multilateral
or official organizations such as the International Bank for Reconstruction and Development, or IBRD, the IADB or the JICA.  The Central
Bank regulation implementing this resolution provides, among other things, that the account referred to in the first bullet point above must be
an  account  opened  in  a  federal  financial  institution,  which  is  to  hold  such  funds  until  released  for  the  purpose  of  refinancing  outstanding
obligations of the borrower.  The Central Bank regulation further provides that the account described in the second bullet point above must be
an escrow account to be opened in a federal financial institution and to secure the payment of principal and interest on the external debt.

Our  foreign  currency‑denominated  transactions  are  also  subject  to  the  approval  of  the  National  Secretariat  of  Treasury  (Secretaria  do
Tesouro Nacional)  and  the  Central  Bank.    After  reviewing  the  financial  terms  and  conditions  of  the  transaction,  the  National  Secretariat  of
Treasury and the Central Bank will issue an approval for the closing of the foreign exchange transaction relating to the entry of the funds into
Brazil and, following such entry and at our request, an electronic certificate of registration through which all scheduled payments of principal,
interest  and  expenses  will  be  remitted  by  us.    The  electronic  certificate  of  registration  grants  the  borrower  access  to  the  market  for  foreign
exchange.

Lending Limits of Brazilian Financial Institutions

The CMN Resolution No. 2,827/2001 dated as of March 30, 2001, as amended, limits the amount that Brazilian financial institutions may
lend to public sector companies, such as us.  Financing of projects which are put up for international bid and any financing in reais provided to
the Brazilian counterpart of such international bids are excluded from these limits.

Scope of Business

State Law No. 12,292/2006, dated as of March 2, 2006, and amended State Law No. 119/1973, dated as of June 29, 1973, which created
our Company, authorizes us to provide water and sewage services outside São Paulo (in other states of Brazil and other countries).  This law
also authorizes us to own interests in other public or private‑public companies and Brazilian or international consortia.  In addition, this law
permits  us  to  incorporate  subsidiaries  and  enter  into  a  partnership  with  or  acquire  interests  in  a  private  company  with  a  corporate  purpose
related to the sanitation business.

C.      Organizational Structure

Not applicable.

D.      Property, Plant, Equipment and Intangible Assets

Our principal property, plant and equipment comprise administrative facilities which are stated at historical costs less depreciation.  The
reservoirs,  water  treatment  facilities,  water  distribution  networks  consisting  of  water  pipes,  water  transmission  lines,  water  connections  and
water meters, sewage treatment facilities, and sewage collection networks consisting of sewer lines and sewage connections are recorded as
intangible assets (concession assets).  As of December 31, 2017, we operated through 74,396 kilometers of water pipes and water transmission
lines and 50,991 kilometers of sewer lines.  As of the same date, we operated 240 water treatment facilities and 557 sewage treatment facilities
(including nine ocean outfalls), as well as 16 water quality control laboratories. 

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As of December 31, 2017, the total net book value of our property, plant and equipment and intangible assets (including concession assets)

was R$33,721.2 million.

All of our material properties are located in the state of São Paulo.

ITEM 4A.     UNRESOLVED STAFF COMMENTS

Not applicable.

ITEM 5.            OPERATING AND FINANCIAL REVIEW AND PROSPECTS

The following management’s discussion and analysis of financial condition and results of operations should be read in conjunction with
our audited financial statements included elsewhere in this annual report.  The financial statements included elsewhere in this annual report
have been prepared in accordance with IFRS as issued by the IASB.  This annual report contains forward‑looking statements that involve risks
and  uncertainties.    Our  actual  results  may  differ  materially  from  those  discussed  in  the  forward‑looking  statements  as  a  result  of  various
factors, including, without limitation, those set forth in “Risk Factors”.

In  the  following  discussion,  references  to  increases  or  decreases  in  any  period  are  made  by  comparison  with  the  corresponding  prior

period, except as the context otherwise indicates.

A.      Operating and Financial Review and Prospects

Overview

As of December 31, 2017, we operated water and sewage systems in the state of São Paulo, including in the city of São Paulo, Brazil’s
largest  city.    Our  operations  extended  into  a  total  of  368 municipalities,  or  57%  of  all  municipalities  in  the  state.    We  also  provided  water
services on a wholesale basis to five municipalities located in the São Paulo metropolitan region in which we did not operate water distribution
systems. 

The São Paulo metropolitan region, which includes the city of São Paulo, is our most important service region.  With a total population of
approximately 20.8    million,  the  São  Paulo  metropolitan  region  accounted  for  70.7%,  69.7%  and  67.3%  of  our  gross  operating  revenue  in
2017, 2016 and 2015 (excluding revenues relating to the construction of concession infrastructure), respectively.  As of December 31, 2017,
64.5% of the concession intangible assets reflected on our balance sheet were located in this region.  In an effort to respond to demand in the
São  Paulo  metropolitan  region,  we  have  concentrated  a  major  portion  of  our  capital  expenditure  program  to  expand  the  water  and  sewage
systems and to increase and protect water sources in this region.  Our capital expenditure program is our most significant liquidity and capital
resource requirement.

Factors Affecting Our Results of Operations

Our  results  of  operations  and  financial  condition  are  generally  affected  by  our  ability  to  raise  tariffs,  control  costs  and  improve

productivity, general economic conditions in Brazil and abroad, and extreme weather events.

In 2015, our business was significantly affected by the most severe drought recorded in our service area in over 80 years. During the rainy
season that began in October 2015 and ended in March 2016, rainfall returned to its historical average, resulting in the level of water in the
reservoirs  that  provide  water  to  the  population  of  the  São  Paulo  metropolitan  region  returned  to  normal  and  the  measures  taken  during  the
water crisis to continue to services consumers were gradually discontinued.  However, heightened public awareness of the need to conserve
water during the crisis resulted in our customers adopting lower water consumption practices during the water crisis and these practices have
been  partially  integrated  into  our  consumers’  daily  habits.    Another  probable  factor  of  the  reduction  of  consumption  during  2016  is  the
contraction  of  the  Brazilian  economy,  which  may  have  resulted  in  lower  consumption  of  water  by  industry  and  other  businesses.  In  2017,
consumption levels largely recovered in the residential category, while consumption in the industrial category continued to decline mainly due
to the low level of growth in the Brazilian economy. As a result of this new behavior, despite our reservoirs having a higher volume of water
available for treatment, the volume of water billed to our clients has not returned to the 2013 pre-water crisis levels.

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Effects of Tariff Increases

Our results of operations and financial condition are highly dependent on tariff increases for our water and sewage services.  Since the
enactment  of  the  Basic  Sanitation  Law  in  2007,  as  a  general  rule,  regulatory  agencies  are  responsible  for  setting,  adjusting  and  reviewing
tariffs, taking into consideration, among other factors, the following:

·         political considerations arising from our status as a State‑controlled company;

·         anti‑inflation measures enacted by the federal government from time to time; and

·                 when necessary, the readjustment to maintain the original balance between each party’s obligation and economic gain (equilíbrio

econômico‑financeiro) under the agreement.

Readjustment  of  our  tariffs  continues  to  be  set  annually  and  depend  on  the  parameters  established  by  the  Basic  Sanitation  Law  and
ARSESP.  The guidelines also establish procedural steps and the terms for annual adjustments.  The annual adjustments must be announced
30 days prior to the effective date of the new tariffs.  See “4.B. Business Overview—Tariffs”. 

The following table sets forth, for the years indicated, the percentage increase of our tariffs, as compared to three inflation indexes:

Increase in average tariff(1)
Inflation – IPC – FIPE
Inflation – IPCA
Inflation – IGP‑M

Year ended December 31,

2017
7.89%
2.27%
2.95%
(0.52)%

2016
8.45%
6.54%
6.29%
7.17%

2015

15.24%
11.07%
10.67%

10.54%

(1)     See “Item 4.B. Business Overview—Tariffs” for addition information on tariff increases.

Sources: Central Bank, Fundação Getulio Vargas, or FGV, Instituto Brasileiro de Geografia e Estatística, or IBGE, and Fundação Instituto de Pesquisas Econômicas.

Effects of Brazilian Economic Conditions

As  a  company  with  all  of  its  operations  in  Brazil,  our  results  of  operations  and  financial  condition  are  affected  by  general  economic
conditions  in  Brazil,  particularly  by  the  economic  activity  and  the  inflation  rate.    For  example,  the  general  performance  of  the  Brazilian
economy  may  affect  our  cost  of  capital  and  inflation  may  affect  our  costs  and  margins.    The  Brazilian  economic  environment  has  been
characterized by significant variations in economic growth rates.  However, as our product is viewed as essential, in normal conditions our
sales revenue demonstrates stability. 

General Economic Conditions 

In 2015, Brazilian GDP decreased 3.8% in comparison with 2014, the worst result in 25 years.  Also in 2015, Brazil had US$368.4 billion

in currency reserves and its trade surplus was US$19.7 billion.  The average unemployment rate in Brazil was 8.5%.

In 2016, Brazilian GDP decreased 3.6% in comparison with 2015.  Brazil’s trade surplus in 2016 was US$47.7 billion, the highest surplus
recorded since the start of the historical series in 1989 and at year-end the country had US$372.2 billion in currency reserves.  The average
unemployment rate in Brazil in 2016 was 11.5%.

In 2017, Brazilian GDP increased 1% in comparison with 2016. Brazil’s trade surplus in 2017 was US$67 billion and at year-end the

country had US$381.9 billion in currency reserves. The average unemployment rate in Brazil in 2017 was 12.7%, the highest rate ever
recorded by IBGE.

Interest Rates

As a political monetary instrument of the federal government, the SELIC rate influences the behavior of other interest rates in the country,
including  the  rates  related  indebtedness  denominated  in  local  currency.    In  2011,  until  the  month  of  August,  the  Central  Bank  continued
increasing the SELIC rate, reaching 12.50% in July.  In the month of August, the Central Bank started decreasing the SELIC, closing 2011 at
11.00%.  This downward trend was maintained in 2012, with the SELIC rate closing the year of 2012 at 7.25%.  In 2013, the SELIC rate was
kept at 7.25% until April, after which the Central Bank started to gradually raise it.  The SELIC rate was 11.65% at December 31, 2014 and
increased to 14.15% at December 31, 2015.  The SELIC rate increased to 13.65% at December 31, 2016. A series of rate reductions in 2017,
brought the SELIC rate down to 6.90% as of December 7, 2017, where it remained at year-end 2017.

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We have not contracted any derivative financial instruments or any hedging instruments to mitigate interest rate fluctuations. 

Inflation

Inflation  affects  our  financial  performance  by  increasing  our  costs  of  services  rendered  and  operating  expenses.    Part  of  our
real‑denominated debt is directly indexed to take into account the effects of inflation.  Additionally, we are exposed to the mismatch between
the  inflation  adjustment  indices  of  our  loans  and  financing  and  those  of  our  receivables.    Water  supply  and  sewage  service  tariffs  do  not
necessarily  follow  the  increases  in  inflation  adjustment  and  interest  rates  affecting  our  debt.    We  cannot  assure  you  that  our  tariffs  will  be
increased, in future periods, to offset, in full or in part, the effects of inflation.   

Inflation adjustments derive from collections from or payment to third parties, as contractually required by law or court decision, and are
recognized on an accrual basis.  Inflation adjustments included in these agreements and decisions are not considered embedded derivatives,
since  they  are  deemed  as  inflation  adjustments  for  us.    See  Notes  3.20,  5.1  and  28  of  the  financial  statements  for  the  impacts  of  inflation
adjustments on our financial performance and debt.

Currency Exchange Rates

We had total foreign currency‑denominated indebtedness of R$5,672.8 million as of December 31, 2017, of which R$547.4 million relates
to  the  current  portion  of  our  long-term  foreign  currency‑denominated  obligations.    In  the  event  of  significant  devaluations  of  the  real  in
relation to the U.S. dollar or other currencies, the cost of servicing our foreign currency‑denominated obligations would increase as measured
in reais, particularly as our tariff and other revenue is based solely in reais.  In addition, any significant devaluation of the real will increase
our  financial  expenses  as  a  result  of  foreign  exchange  losses  that  we  must  record.  In  2015,  the  47.01%  depreciation  of  the  real against the
dollar  and  the  45.95%  depreciation  of  the  real against  the  yen  led  to  a  foreign  exchange  loss  of  R$1,992.0  million.    In  2016,  the  16.54%
appreciation  of  the  real  against  the  U.S.  dollar  and  the  13.89%  appreciation  of  the  real against  the  yen  led  to  a  foreign  exchange  gain  of
R$1,090.5 million. In 2017, the 1.50% depreciation of the real against the dollar and the 5.38% depreciation of the real against the yen led to a
foreign exchange loss of R$96.3 million. However, since most of our debt denominated in foreign currencies is long-term debt with a long
amortization schedule, a devaluation of the real would principally impact cash flows regarding the current portion of our long-term debt.

We manage our indebtedness portfolio closely to decrease the cost of servicing our indebtedness as a whole and our exposure to exchange

rate fluctuations.  We do not have any exposure to derivatives tied to foreign currencies.

The following table shows the fluctuation of the real against the U.S. dollar, the period‑end exchange rates and the average exchange rates

as of or for the years indicated:

Year ended December 31,

Depreciation (appreciation) of the real versus U.S. dollar(1)
Period‑end exchange rate – US$1.00
Average exchange rate – US$1.00(2)

(1)        

Represents the comparison with period-end exchange rate. Source:  Central Bank.

(2)        

Represents the average for period indicated.

2016

2017
(in reais, except percentages)
1.50%

(16.54)%

3.3080

3.1925

3.2591

3.3523

2015

47.0%

3.9048
3.3387

The following table shows the fluctuation of the real against the yen, the period‑end exchange rates and the average exchange rates as of

or for the years indicated:

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Depreciation (appreciation) of the real versus yen(1)
Period‑end exchange rate – ¥1.00
Average exchange rate – ¥1.0(2)

(1)        

Represents the comparison with period-end exchange rate.  Source:  Central Bank.

(2)        

Represents the average for period indicated.

Year ended December 31,

2016
(in reais, except percentages)
(13.89)%

0.0279

0.0289

2017

5.38%

0.0294

0.0291

2015

46.0%

0.0324
0.0276

During the years ended December 31, 2017, 2016 and 2015 we had no forward exchange transactions.

For further information on exchange rates, see “Item 3.D. Risk Factors—Risks Relating to Brazil—The devaluation of the real to foreign
currencies may adversely affect us and the market price of our common shares or ADSs” and “Item 5.B. Liquidity and Capital Resources—
Indebtedness Financing—Financial Covenants”.

Effects of Extreme Weather Events

The  southeastern  region  of  Brazil,  particularly  the  southern  region  of  the  state  of  Minas  Gerais,  the  PCJ  River  Basin  (from  which  we
extract  the  water  used  in  the  Cantareira  System),  and  the  northern  area  of  the  São  Paulo  metropolitan  region,  experienced  below  average
rainfall since 2012.  In the October 2013 – March 2014 rainy season, rain levels and water inflow into the reservoirs reached the lowest levels
in more than 80 years of recorded rainfall in the region, a scenario that continued in the October 2014 – March 2015 rainy season.  During the
October 2015 – March 2016 rainy season, the level of rainfall in the region returned to the normal levels expected for the period.  Improved
rainfall  in  the  rainy  season  that  began  in  October  2015,  the  collaborative  efforts  between  us  and  the  population  we  serve  and  emergency
construction works conducted by us throughout 2014 and 2015 to combat the water crisis, resulted in a partial restoration of the water levels of
the Cantareira system.

As  of  December  31,  2017,  the  reservoirs  in  the  São  Paulo  metropolitan  region,  where  our  largest  market  is  located,  contained  916.8
million m3 of water storage for treatment, compared to 951.1 million m3 available for treatment as of December 31, 2016.  The measurements
for these years do not include the technical reserve of 287.5 million m³.  In December 2017, this system served 7.8 million residents, compared
to 8.9 million in February 2014, the last month before the water crisis started. 

 In order to balance supply and demand despite restricted water availability, we adopted from February 2014 until April 2016 a series of
measures.  With the return of the rainfall to its historical average for the rainy season that began in October 2015 and ended in March 2016, the
level of water in the reservoirs that provide water to the population of the São Paulo metropolitan region returned to normal and the measures
taken during the water crisis to continue to services consumers were gradually discontinued.  See “Item 4.B. Business Overview—The Recent
Water Crisis”.

Critical Accounting Estimates and Judgments

We make estimates and judgments concerning the future.  The resulting accounting estimates will, by definition, seldom equal the related
actual results.  The estimates and judgments that have a significant risk of causing material adjustment to the carrying amount of our assets and
liabilities within the next financial year are mentioned below.

Allowance for Doubtful Accounts

We establish an allowance for doubtful accounts in an amount that our management considers sufficient to cover expected losses, based on
an  analysis  of  customer  accounts  receivable,  in  accordance  with  the  accounting  policy  stated  in  Note  3.4  to  our  financial  statements  as  of
December 31, 2017 and 2016 and for the years ended December 31, 2017, 2016 and 2015.  Bad debt expense, net of recoveries, is included in
selling  expenses,  and  was  R$82.7  million,  R$90.5  million  and  R$2.4  million  for  the  years  ended  December  31,  2017,  2016  and  2015,
respectively.    Wholesale  sales  losses,  amounting  to  R$203.5  million,  R$328.7  million  and  R$273.0  million  in  2017,  2016  and  2015,
respectively, were also recorded as a reduction of revenue.

The  methodology  for  determining  the  allowance  for  doubtful  accounts  requires  significant  estimates,  considering  a  number  of  factors,
including  historical  collection  experience,  current  economic  trends,  estimates  of  forecast  write‑offs,  the  aging  of  the  accounts  receivable
portfolio and other factors.  Actual results could differ from those estimates.

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Intangible Assets Arising from Concession and Program Contracts

As of December 31, 2017, we had intangible assets of R$33,466.1 million.

We recognize intangible assets arising from concession contracts under IFRIC 12.  We estimate the fair value of construction and other
work on the infrastructure to recognize the cost of the intangible asset, which is recognized when the infrastructure is built and provided that it
will generate future economic benefits.  The great majority of our contracts for service concession arrangements entered with each grantor is
under service concession agreements in which we have the right to receive, at the end of the contract, a payment equivalent to the asset balance
of the concession intangible asset, which in this case, is amortized over the useful life of the underlying physical assets; thus at the end of the
contract, the remaining value of the intangible would be equal to the residual value of the related physical asset.

The fair value of construction and other work on the infrastructure is recognized as revenue, at its fair value, when the infrastructure is
built,  provided  that  this  work  is  expected  to  generate  future  economic  benefits.    The  accounting  policy  for  the  recognition  of  construction
revenue is described in Note 3.3 “Operating Revenue” to our financial statements.

Intangible assets related to concession agreements and program contracts, when there is no right to receive the residual value of the assets
at  the  end  of  the  contract,  are  amortized  on  a  straight-line  basis  over  the  period  of  the  contract  or  the  useful  life  of  the  underlying  asset,
whichever is shorter.

Investments  made  and  not  recovered  through  rendering  of  services,  within  the  terms  of  our  agreement,  must  be  indemnified  by  the
concession grantor; (1) with cash or cash equivalents or also, in general, (2) with a contract extension.  These investments are amortized over
the useful life of the asset.

Law  No.11,445/2007  prescribes  that,  whenever  possible,  basic  sanitation  public  utilities  shall  have  their  economic  and  financial
sustainability ensured through the consideration received from service collection, preferably as tariffs and other public charges, which may be
established for each service or both.  Therefore, investments made and not recovered through these services, within the original term of the
contract,  are  recorded  as  intangible  assets  and  amortized  over  the  useful  life  of  the  asset,  taking  into  consideration  a  solid  track  record  of
concession renewal and, therefore, the continuity of services.

The recognition of fair value for the intangible assets arising on concession contracts is subject to assumptions and estimates, and the use
of different assumptions could affect the carrying amounts of these assets.  The amortization of intangible assets and estimated useful lives of
the  underlying  assets  also  requires  significant  assumptions  and  estimates,  which  different  assumptions  and  estimates,  and  changes  in  future
circumstances,  could  affect  amortization  of  intangible  assets  and  remaining  useful  lives  of  the  underlying  assets  and  can  have  a  significant
impact on the results of operations.

Provisions and Contingent Liabilities

We are a party to a number of legal proceedings involving significant monetary claims.  These legal proceedings include, among other
types,  disputes  with  customers  and  suppliers  and  tax,  labor,  civil,  environmental  and  other  proceedings.    For  a  more  detailed  discussion  of
these legal proceedings, see Note 19 to our financial statements included in this annual report.  We recognize provisions for legal proceedings
in  which  our  company  has  a  present  obligation  as  a  result  of  past  events  (either  due  to  an  explicit  agreement  or  duty,  known  as  a  legal
obligation; or due to our past actions, known as a constructive obligation), it is probable that an outflow of resources embodying economic
benefits will be necessary to settle the obligation and the amount of obligation can be estimated reliably.  Therefore, we are required to make
judgments regarding future events for which we often seek the advice of legal counsel.  As a result of the significant judgment required in
assessing  and  estimating  these  provisions,  actual  losses  realized  in  future  periods  could  differ  significantly  from  our  estimates  and  could
exceed the amounts which we have provisioned.

As  of  December  31,  2017,  we  were  party  to  judicial  and  administrative  proceedings,  relating  to  civil,  environmental  and  tax  matters,
amounting to R$1,078.2 million (after deducting court escrow deposits in the amount of R$344.4 million) with respect to which we recognized
provisions based on the criteria described above, as shown in Note 3.15 to our financial statements included in this annual report.  As of the
same date, the proceedings with respect to which we have contingent liabilities (i.e., no provisions have been recognized) totaled R$54,627.0
million, of which we believe R$46,396.0 million of those have a remote probability of an outflow of resources embodying economic benefits
exists.

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Pension Benefits

The present value of the pension obligations depends on a number of factors that are determined on an actuarial basis using a number of
assumptions.    The  assumptions  used  in  determining  the  net  cost  (income)  for  pensions  include  a  discount  rate  and  a  mortality  table.    Any
changes in these assumptions will impact the carrying amount of pension obligations.

We determine the appropriate discount rates at the end of each year, which is the interest rate that should be used to determine the present
value of estimated future cash outflows expected to be required to settle the pension obligations.  The discount rate was decreased from 5.71%
in 2016 to 5.30% in 2017 under Plan G0 and from 5.74% in 2016 to 5.35% in 2017 under Plan G1 in order to follow the decrease in the rates
applicable to the Brazilian Government NTN – B, long term notes, which term is similar to the duration of the pension benefits, as described in
Notes 3.19 (a) and 20 (b) to our financial statements included in this annual report.

Other  key  assumptions  for  pension  obligations  are  based  in  part  on  current  market  conditions.    Additional  information  on  the  pension

plans under Plan G0 and G1 is disclosed in Note 20 to our financial statements included in this annual report.

Deferred income tax and social contribution

We recognize and settle taxes on income based on the results of operations verified according to the Brazilian Corporate Law, taking into
consideration the provisions of the tax laws. We recognize deferred tax assets and liabilities based on the differences between the accounting
balances and the tax bases of assets and liabilities. 

We regularly review the recoverability of deferred tax assets and do not recognize deferred tax assets if it is probable that these assets will
not  be  realized,  based  on  historic  taxable  income,  the  projection  of  future  taxable  income  and  the  estimated  period  to  reverse  temporary
differences.  This process requires the use of estimates and assumptions.  The use of different estimates and assumptions could result in the
non-recognition of a significant amount of deferred tax assets.

As  of  December  31,  2017  and  2016,  we  have  recognized  R$36.8  million  and  R$186.3  million  as  deferred  income  tax  liabilities  and
deferred  income  tax  assets,  respectively,  in  each  case,  net  of  the  deferred  tax  assets  and  liabilities,  as  disclosed  in  Note  18  to  our  financial
statements included in this annual report.

Certain Transactions with Controlling Shareholder

Reimbursement Due from the State

Reimbursement due from the State for pensions paid represent supplementary pensions (Plan G0) that we pay, on behalf of the State, to
former employees of State‑owned companies which merged to form our Company.  These amounts must be reimbursed to us by the State, as
primary obligor.

In November 2008, we entered into the third amendment to the agreement with the State relating to payments of pension benefits made by
us on its behalf.  The State acknowledged that it owed us an outstanding balance of R$915.3 million as of September 30, 2008, relating to
payments of pension benefits made by us on its behalf.  We provisionally accepted, but it is not recognized in our books, the reservoirs in the
Alto Tietê System as partial payment in the amount of R$696.3 million, subject to the transfer of the property rights of these reservoirs to us. 
Since  November  2008,  the  State  has  been  paying  the  remaining  balance  in  the  amount  of  R$219.0  million  in  114  successive  monthly
installments.    See  Note  10 to  our  financial  statements  included  in  this  annual  report  and  “Item  7.    Major  Shareholders  and  Related  Party
Transactions”.

On March 18, 2015, we, the State and DAEE, with the intervention of the Department of Sanitation and Water Resources, executed an
agreement in the amount of R$1,012.3 million, consisting of R$696.3 million in principal amount and R$316.0 million in monetary adjustment
of the principal through February 2015.  For detailed information on this agreement, see “Item 7.B. Related Party Transactions—Agreements
with the State” and Note 10(a)(vii) to our financial statements included in this annual report.

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As  of  December  31,  2017  and  2016,  the  amounts  not  recognized  related  to  pension  benefits  paid  by  us  on  behalf  of  the  State  totaled
R$1,021.7 million  and  R$937.0  million  respectively.    As  a  result,  we  also  recognized  the  obligation  related  to  pension  benefits,  maintained
with  the  beneficiaries  and  pensioners  of  Plan  G0.    As  of  December  31,  2017  and  2016,  the  pension  benefit  obligations  of  Plan  G0  totaled
R$2,543.9 million and R$2,512.1 million, respectively.  For detailed information on the pension benefit obligations refer to Note 20 to our
financial statements included in this annual report. 

Accounts Receivable from the State for Water and Sewage Services Rendered

Certain of these accounts receivable have been overdue for a long period.  We have entered into agreements with the State with respect to
these accounts receivable.  For further information on these agreements, see Note 10 to our financial statements included in this annual report
and “Item 7.  Major Shareholders and Related Party Transactions”.

Use of Guarapiranga and Billings reservoirs

We draw water for use in the São Paulo metropolitan area from the Guarapiranga and Billings reservoirs.  EMAE, a company that is also
controlled  by  the  State  of  São  Paulo,  has  a  concession  to  produce  hydroelectric  energy  using  water  from  the  same  reservoirs.    EMAE
commenced various lawsuits against us in the past seeking compensation for the water we draw from these reservoirs.  Those lawsuits have
now been settled, by way of an agreement between EMAE and our company. 

The settlement agreement requires us to make certain installment payments to EMAE in settlement of the claim for compensation for our
capture and use of the water, as well as apportionment of the maintenance, operation and monitoring costs for the reservoirs.  See “Item 7. 
Major Shareholders and Related Party Transactions” and See Note 10(c) to our financial statements included in this annual report.

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Results of Operations

The  following  table  sets  forth,  for  the  years  indicated,  certain  items  from  our  income  statements  of  operations,  each  expressed  as  a

percentage of net operating revenue:

Year ended December 31,

2017

2016
(in millions of reais, except percentages)

2015

Net operating revenue

Cost of services
Gross profit
Selling expenses
Administrative income (expenses)
Other operating income (expenses), net and equity in results of

investments in affiliates

Profit from operations before finance income (expenses) and income

tax and social contribution
Financial income (expenses), net
Profit before income tax and social contribution
Income tax and social contribution

Profit for the year

14,608.2

(8,778.9)
5,829.3
(768.7)
(1,099.0)

100.0%

(60.1)%
39.9%
(5.3)%
(7.5)%

14,098.2

100.0%

11,711.6

100.0%

(9,013.1)
5,085.1
(730.0)
(934.9)

(63.9)%
36.1%
(5.2)%
(6.6)%

(8,260.8)
3,450.8
(598.1)
45.0

(70.5)%
29.5%
(5.1)%
0.4%

0.1

0.0%

9.5

0.1%

146.4

1.3%

3,961.7
(458.1)
3,503.6

(984.3)

2,519.3

27.1%
(3.1)%
24.0%

(6.7)%

17.2%

3,429.7
699.4
4,129.1
(1,182.0)

2,947.1

24.3%
5.0%
29.3%
(8.4)%

20.9%

3,044.1
(2,456.5)
587.6
(51.3)

26.0%
(21.0)%
5.0%
(0.4)%

536.3

4.6%

Year Ended December 31, 2017 Compared to Year Ended December 31, 2016

Net operating revenue 

Net operating revenue increased by R$510.0 million, or 3.6%, to R$14,608.2 million in 2017 from R$14,098.2 million in 2016.

Net operating revenue, disregarding the effect of construction revenue, as of December 31, 2017, increased R$1,092.0 million, or 10.5%,

from R$10,365.3 million in 2016 to R$11,457.3 million in 2017. In 2017, the construction revenue was R$3,150.9 million compared to
R$3,732.9 million in 2016. The variations in net operating revenue were principally due to:

·         an increase of 8.4% in tariffs since May 2016 (ordinary tariff adjustment);

·         an increase of 7.9% in tariffs since November 2017 (extraordinary tariff revision);

·         an increase of 4.3% in our total billed volume (4.3% in water and 4.2% in sewage);

·         the cancelation of the Water Consumption Reduction Incentive Program, concluded in April 2016, resulting in no bonus granted
in 2017, compared to a bonus granted in the amount of R$187.4 million in 2016 which resulted in a decrease in revenue in 2016;
and

·                 a lower estimated loss of wholesale revenue in 2017, in the amount of R$125.1 million, due to the payment received in the

period, mainly from the municipality of Guarulhos.

These  increases  were  partially  offset  by  the  suspension  of  the  Contingency  Tariff  in  April  2016,  in  the  amount  of  R$224.7  million  in

2016.

Cost of services

Our cost of services decreased by R$234.2 million, or 2.6%, to R$8,778.9 million in 2017 from R$9,013.1 million in 2016.

The decrease in cost of services was principally due to the following factors:

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·         a decrease of R$570.9 million in construction costs due to lower investments in the municipalities we serve; and

·         a decrease of R$138.1 million in the cost of electricity, mainly due to an average decrease of 12.7% in free market tariffs, with a 16.9%
increase in consumption; an average decrease of 27.5% in the Tariff for the Use of Distribution System (TUSD), with a 19.6% decrease in
consumption; and an average decrease of 5.3% in regulated market tariffs, with a 5.7% decrease in consumption.

The decrease in cost of services was partially offset by:

·                  an  increase  of  R$303.2  million  in  salaries  and  payroll  charges  and  pension  plan  obligations  due  to  the  reduction  in  non-
recurring expenses in 2016 in connection with the migration of participants from the Defined Benefit Plan (G1) to the Defined
Contribution Plan (Sabesprev Mais), which generated an early reduction of R$223.5 million in the actuarial deficit. The increase
in salaries and payroll charges is also due to an increase of R$72.5 million, principally driven by the 1% increase related to the
Career and Salary Plan since December 2016 and the 3.71% pay rise in May 2017;

·         an increase of R$100.8 million in depreciation and amortization, mainly due to the increase in operating intangible assets in

2017, principally due to new assets entering into operation; and

·                 an increase of R$34.5 million in the provision for the Municipal Fund for Environmental Sanitation and Infrastructure, as a

result of the increase in revenues generated from the municipality of São Paulo.

Gross Profit

As a result of the factors discussed above, gross profit for the year ended December 31, 2017 increased by R$744.2 million, or 14.6 %, to

R$5,829.3 million in 2017 from R$5,085.1 million in 2016. 

Selling Expenses

Selling  expenses  increased  by  R$38.7  million,  or  5.3%,  to  R$768.7  in  2017  from  R$730.0  million  in  2016.  The  increase  in  selling

expenses was primarily due to:

·         an increase of R$59.0 million in salaries and payroll charges and pension plan obligations due to the reduction in non-recurring
expenses  in  2016  in  connection  with  to  the  migration  of  participants  from  the  Defined  Benefit  Plan  (G1)  to  the  Defined
Contribution Plan (Sabesprev Mais), which generated an early reduction of R$30.4 million in the actuarial deficit in 2016. The
increase  in  salaries  and  payroll  charges  is  also  due  to  an  increase  of  R$13.2  million,  principally  driven  by  the  1%  increase
related to the Career and Salary Plan since December 2016 and the 3.71% pay rise in May 2017;

The increase in selling expenses was partially offset by the decrease of R$20.3 million related to outsourced services.

Administrative Income (Expenses)

Administrative expenses increased by R$164.1 million, or 17.6%, to an expense of R$1,099.0 million in 2017 from income of R$934.9

million in 2016. 

The increase in administrative expenses was principally due to:

·         an increase of R$70.9 million in salaries and payroll charges and pension plan obligations resulting from the reduction in non-
recurring expenses in 2016 in connection with the migration of participants from the Defined Benefit Plan (G1) to the Defined
Contribution Plan (Sabesprev Mais), which generated an early reduction of R$80.3 million in the actuarial deficit in 2016. The
increase in salaries and payroll charges is also driven by the 1% increase related to the Career and Salary Plan since December
2016 and the 3.71% pay rise in May 2017;

·         an increase of R$48.5 million in depreciation and amortization, mainly due to the implementation of the Integrated Business

Management System (Enterprise Resource Planning – SAP ERP) in 2017; and

·         an increase of R$28.8 million related to outsourced services.

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Other Operating Income (Expenses), Net and Equity in Results of Investments in Affiliates

Other operating income, net was R$0.1 million in 2017 compared with R$9.5 million operating income, net in 2016.

Other operating income, net consists of gains and losses from sales of property, plant and equipment, sale of contracts awarded in public
bids, right to sell electricity, indemnities and reimbursement of expenses, fines and collaterals, property leases, reuse of water, PURA projects
and services.

Other operating income decreased by R$9.4 million,  mainly  due  to  the  estimate  for  losses  in  2017  on  discontinued  concessions,  in  the

amount of R$24.1 million, partially offset by higher revenues from the sale of surplus energy, in the amount of R$8.5 million.

Our  other  operating  expenses  consist  mainly  of  write-offs  of  concessions  assets  due  to  obsolescence,  discontinued  construction  works,
unproductive  wells,  projects  considered  economically  unfeasible,  losses  on  property,  plant  and  equipment  and  exceeding  cost  of  electricity
sold.

Financial Income (Expenses), Net

Financial income (expenses), net consists primarily of interest on our indebtedness and foreign exchange losses (or gains) in respect to our
indebtedness,  offset  partially  by  interest  income  on  cash  and  cash  equivalents  and  inflation  based  indexation  accruals,  mainly  relating  to
agreements entered into with some customers to settle overdue accounts receivable.

Financial  income  (expenses),  net  increased  by  R$1,157.5 million  to  financial  expense,  net  of  R$458.1  million  in  2017  from  financial

income, net of R$699.4 million in 2016.

The variation was due to a positive variation of R$1,186.6 million in the cost of currency variations on borrowings and financing, due to
the strengthening of the real against the U.S. dollar and the Japanese Yen in 2017 (1.5% and 5.3%, respectively), compared to a devaluation of
the real in 2016 (16.5% and 13.9%, respectively).

Profit before income tax and social contribution

As a result of the factors discussed above, profit before income tax and social contribution decreased by R$625.5 million, to R$3,503.6
million  in  2017  from  R$4,129.1  million  in  2016.    As  a  percentage  of  net  operating  revenue,  our  profit  before  income  tax  and  social
contribution increased to 24.0% in 2017 compared to 29.3% in 2016.

Income Tax and Social Contribution

Income tax and social contribution expense decreased by R$197.7 million, or 16.7%, to R$984.3 million in 2017 from R$1,182.0 million

in 2016.  This decrease was mainly due to our lower taxable result in 2017, which was impacted by the exchange rate variation.

Profit for the year

As a result of the factors discussed above, our profit for the year decreased to R$2,519.3 million in 2017 from R$2,947.1 million in 2016.

As a percentage of net operating revenue, our profit for the year decreased to 17.2% in 2017 from 20.9% in 2016.

Year Ended December 31, 2016 Compared to Year Ended December 31, 2015

Net operating revenue 

Net operating revenue increased by R$2,386.6 million, or 20.4%, to R$14,098.2 million in 2016 from R$11,711.6 million in 2015.  These

variations were principally due to:

·         an increase of 15.2% in tariffs since June 2015 (7.8% ordinary tariff adjustment and 6.9% extraordinary tariff revision);

·         an increase of 8.4% in tariffs since May 2016;

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·         an increase of 4.4% in our total billed volume (4.0% in water and 4.8% in sewage); and

·                  a  reduction  in  the  bonus  granted  within  the  Water  Consumption  Reduction  Incentive  Program,  concluded  in  April  2016,  which

amounted to R$187.4 million in 2016 compared to the R$926.1 million granted in 2015.

These increases were partially offset by the suspension of the Contingency Tariff in April 2016, in the amount of R$224.7 million in 2016

compared to the R$499.7 million in 2015.

Construction revenue increased by R$396.2 million, or 11.9%, to R$3,732.9 million in 2016 from R$3,336.7 million in 2015.  See Note
3.3(b)  to  our  financial  statements  included  in  this  annual  report  for  a  description  of  the  accounting  policies  applicable  to  our  construction
services business.

Cost of services

Our  cost  of  services  increased  by  R$752.3  million,  or  9.1%,  to  R$9,013.1  million  in  2016  from  R$8,260.8  million  in  2015.  As  a

percentage of net operating revenue, cost of services decreased to 63.9% in 2016 from 70.5% in 2015.

The increase in cost of services was principally due to the following factors:

·         an increase of R$387.6 million in construction costs due to higher investments in 2016;

·         an increase of R$117.3 million in the cost of the electricity, mainly due to an average increase of 15.4% in the free market tariffs,
with an 2.3% increase in consumption; an average increase of 21.5% in the Tariff for the Use of Distribution System (TUSD), with a
5.0% increase in consumption; and an average increase of 1.5% in the regulated market tariffs, with consumption remaining stable;

·                  an  increase  in  the  provision  for  the  Municipal  Fund  for  Environmental  Sanitation  and  Infrastructure,  in  the  amount  of  R$101.1

million, as a result of the increase in revenues generated from the municipality of São Paulo; and

·         an increase of R$72.0 million in depreciation and amortization, mainly due to the increase in operating intangible assets in 2016,

arising principally from entry into operation of new assets.

Gross Profit

As a result of the factors discussed above, gross profit for the year ended December 31, 2016 increased by R$1,634.3 million, or 47.4%, to
R$5,085.1 million in 2016 from R$3,450.8 million in 2015.  As a percentage of net operating revenue, gross profit margin increased to 36.1%
in 2016 from 29.5% in 2015.

Selling Expenses

Selling expenses increased by R$131.9 million,  or  22.1%,  to  R$730.0 in  2016  from  R$598.1 million  in  2015.    As  a  percentage  of  net
operating revenue, selling expenses increased slightly to 5.2% in 2016 from 5.1% in 2015.  The increase in selling expenses was primarily due
to:

·                  an  increase  of  R$88.0  million,  mainly  resulting  from  (i)  increase  in  default,  causing  a  R$165.4  million  impact,  and  (ii)  lower
recovery  of  funds,  in  the  amount  of  R$34.5  million.   This  increase  was  partially  offset  by  increased  receipts  of  court-ordered  debt
payments, especially from the municipality of Guarulhos, amounting to R$110.9 million;

·         an increase of R$30.9 million in services expenses, due to the increase in the scope of water meter readings and increased use of

credit recovery services in 2016.

Administrative Income (Expenses)

Administrative  expenses  increased  by  R$979.9 million,  to  an  expense  of  R$934.9  million  in  2016  from  income  of  R$45.0  million  in

2015.  As a percentage of net operating revenue, administrative expenses amounted to 6.6% in 2016.

The increase in administrative expenses was principally due to: 

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·         a credit in the amount of R$696.3 million received in 2015 as a result of an agreement with the government of the state of São Paulo
to receive an undisputed amount owed to us related to the payment of the benefits to former employees (see Note 10 (a) (vii) to our
financial statements included in this annual report and;

·                  an  increase  of  R$278.4  million  in  general  expenses,  mainly  due  to  increased  provisions  for  court  proceedings  in  2016  and

provision reversals in 2015, resulting from judicial decisions.

Other Operating Income (Expenses), Net and Equity in Results of Investments in Affiliates

Other operating income, net was R$9.5 million in 2016 compared with R$146.4 million operating expenses, net in 2015. 

Other operating income, net consists of gains and losses from sales of property, plant and equipment, sale of contracts awarded in public
bids, right to sell electricity, indemnities and reimbursement of expenses, fines and collaterals, property leases, reuse of water, PURA projects
and services.

Our other operating income decreased by R$128.3 million, mainly due to:  (i) decrease in gain in sale of properties (R$47.4 million); (ii)
decrease in sales of the exceeding cost of electricity (R$42.8 million); (iii) lower amounts received from the Hydrographic Basin Depollution
Program (R$22.6 million); and (iv) lower amounts received related to contractual fines on suppliers (R$16.8 million).

Our  other  operating  expenses  consist  mainly  of  write-offs  of  concessions  assets  due  to  obsolescence,  discontinued  construction  works,
unproductive  wells,  projects  considered  economically  unfeasible,  losses  on  property,  plant  and  equipment  and  exceeding  cost  of  electricity
sold.

Financial Income (Expenses), Net

Financial income (expenses), net consists primarily of interest on our indebtedness and foreign exchange losses (or gains) in respect to our
indebtedness,  offset  partially  by  interest  income  on  cash  and  cash  equivalents  and  inflation  based  indexation  accruals,  mainly  relating  to
agreements entered into with some customers to settle overdue accounts receivable.

Financial  income  (expenses),  net  increased  by  R$3,155.9  million  to  financial  income,  net  of  R$699.4  million  in  2016  from  financial
expense, net of R$2,456.5 million in 2015. As a percentage of net operating revenues, financial income amounted to 5.0% in 2016 compared
with financial expenses amounting to 21.0% in 2015. The variation was due to:

·         a positive variation of R$3,082.9 million in the cost of currency variations on borrowings and financing, due to the strengthening of
the real against the U.S. dollar and the Japanese Yen in 2016 (16.5% and 13.9%, respectively), when compared to the devaluation of
the real in 2015 (47.0% and 45.9%, respectively); and 

·         an increase in the cost of other monetary variations by R$65.2 million, principally due to higher provisioning for court proceedings in

2016.

Profit before income tax and social contribution

As a result of the factors discussed above, profit before income tax and social contribution increased by R$3,541.5 million, to R$4,129.1
million in 2016 from R$587.6 million in 2015.  As a percentage of net operating revenue, our profit before income tax and social contribution
increased to 29.3% in 2016 compared to 5.0% in 2015.

Income Tax and Social Contribution

Income tax and social contribution expense increased by R$1,130.7 million to R$1,182.0 million in 2016 from R$51.3 million in 2015. 
This increase was mainly due to the upturn in our operating revenues and our financial income, net, which was impacted by the exchange rate
variation.    These  increases  were  partially  offset  by  the  increases  in  our  operating  costs  and  expenses.    Additionally,  the  effective  tax  rate
increased from 9% in 2015 to 29% in 2016, mainly due to the agreement entered into with the State of São Paulo on March 18, 2015, which
was  considered  a  non-taxable  income  (see  reconciliation  of  the  effective  tax  rate  in  Note  18(d)  to  our  financial  statements  included  in  this
annual report.

Profit for the year

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As a result of the factors discussed above, our profit for the year increased to R$2,947.1 million in 2016 from R$536.3 million in 2015. As

a percentage of net operating revenue, our profit for the year increased to 20.9% in 2016 from 4.6% in 2015.

We assess the performance of our enterprise by analyzing the results of the sanitation services provided, our single reportable segment that
includes  all  our  operations  results  except  for  revenue  and  costs  associated  with  the  construction  of  concession  services  infrastructure,
recognized in accordance with IFRIC 12 and as discussed in “Item 4.B. Business Overview—Description of Our Activities”.  Consequently,
management discussion and analysis of the performance of the sanitation services segment is substantially the same as our results discussed
above.

B.      Liquidity and Capital Resources

Capital Sources

In  order  to  satisfy  our  liquidity  and  capital  requirements,  we  have  primarily  relied  on  cash  provided  by  operating  activities,  long-term
borrowings  from  Brazilian  federal  governmental  financial  institutions,  and  long-term  financing  from  multilateral  organizations  and  from
domestic and international development banks, and also from capital markets.  As of December 31, 2017, we had R$2,283.0 million of cash
and  cash  equivalents.    The  outstanding  current  portion  of  our  long-term  indebtedness  was  R$1,746.8  million  as  of  December  31,  2017,  of
which R$547.4 million was denominated in foreign currency.  Long‑term indebtedness was R$10,354.2 million as of December 31, 2017, of
which R$5,125.4 million consisted of foreign currency-denominated obligations. 

Our management expects that the cash and cash equivalents available on December 31, 2017, the operating cash generation estimated for
2018 and the lines of credit available for investments are sufficient to meet our short-term liabilities, in light of our current financial position
and  our  expected  cash  generated  by  operating  activities.  In  our  opinion,  the  working  capital  is  sufficient  for  the  company's  present
requirements.

Cash Flows

Net Cash Generated from Operating Activities

Cash  generated  from  operating  activities  is  the  single  largest  source  of  our  liquidity  and  capital  resources,  and  we  expect  that  it  will
continue to be so in the future. Our net cash generated from operating activities was 3,301.9 million, R$3,003.6 million and R$2,641.4 million
in  2017,  2016  and  2015,  respectively.    The  main  driver  of  our  cash  flow  from  operating  activities  relates  to  our  cash  collections  from
customers,  which  is  due  to  the  nature  of  our  business  and  to  the  fact  that  we  are  expanding  our  infrastructure.  The  increase  in  net  cash
generated in 2017 is due principally to the end of the water crisis, which led to an increase of 4.3% in our total billed volume (4.3% in water
and 4.2% in sewage). This increase was partially offset by the income tax and social contribution paid in 2017.

Net Cash Used in Investing Activities

Net  cash  used  in  investing  activities  was  R$1,971.4  million,  R$2,130.7  million  and  R$2,459.5  million  in  2017,  2016  and  2015,
respectively.  The main driver of our net cash outflow for investing activities relates to purchases of intangible assets, as required under our
concession  and  program  contracts,  which  is  due  to  the  fact  that  we  are  expanding  our  infrastructure  and  service  coverage.  Although  we
invested approximately R$867.3 million (including capitalized interest) in the São Lourenço PPP, a construction project planned and initiated
before the water crisis, this project did not impact our cash flow in 2017.

Net Cash Generated By (Used in) Financing Activities

Our net cash used in financing activities was R$933.6 million, R$625.9 million, and 265.7 million in 2017, 2016 and 2015, respectively. 
The  main  driver  of  our  cash  flows  from  financing  activities  relates  to  the  proceeds  and  repayments  of  loans  used  to  finance  purchases  of
intangible assets related to our concession and program contracts, in order to support the expansion of our services and our payment of interest
on shareholders’ equity.

Indebtedness Financing

Our  total  financial  indebtedness  increased  by  1.1%,  from  R$11,964.1  million  as  of  December  31,  2016  to  R$12,101.0  million  as  of
December  31,  2017.    In  addition,  during  the  same  period,  our  total  indebtedness  denominated  in  foreign  currency  increased  by  0.2%,  from
R$5,660.4 million as of December 31, 2016 to R$5,672.8 million as of December 31, 2017.

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As of December 31, 2017, we had R$10,354.2 million in long-term indebtedness outstanding (excluding the current portion of long-term
indebtedness), of which R$5,125.4 million consisted of foreign currency-denominated long-term debt.  We had an outstanding current portion
of long-term indebtedness of R$1,746.8 million as of December 31, 2017.  As of December 31, 2017, R$547.4 million of this current portion
of long-term indebtedness was denominated in foreign currency.  As of December 31, 2017, our S&P domestic rating was brAA- and our S&P
global rating was BB. Our Moody’s national rating was Aa2.br and our Moody’s global rating was Ba2 as of December 31, 2017, while our
Fitch national rating was AA(bra) and our Fitch global rating was BB, as of the same date. 

Various contractual agreements we have entered into, including certain financing agreements with Caixa Econômica Federal and BNDES,
provide  for  liens  over  a  portion  of  our  cash  flows  from  the  payment  of  water  and  sewage  provision  tariffs.    In  addition,  we  provide  as
guarantees a portion of our cash flow generation to transactions related to PPPs.

  Pursuant to these agreements, cash received from operations is required to pass through designated accounts.  In the event of a default
under the relevant agreement, such cash and future cash flows that are required to be deposited in such accounts become restricted and are
subject to security interests in favor of the relevant creditor.  As of December 31, 2017, a substantial portion of our monthly cash flows from
operations was subject to these liens.  As of that date, the total amount of our secured debt, including indebtedness benefiting from these liens,
was R$3,747.0 million (R$3,720.4 million of principal and R$26.6 million related to interest and charges).  See “—Indebtedness Financing—
Financial Covenants—Local currency denominated indebtedness” and Note 16 to our financial statements included in this annual report.

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The following table sets forth information on our indebtedness outstanding as of December 31, 2017:

Denominated in local currency:

10th issue debentures
12th issue debentures

14th issue debentures

15th issue debentures

17th issue debentures

18th issue debentures

20th issue debentures

21st issue debentures
Caixa Econômica Federal
National Bank for Economic and Social

Development (BNDES) Coastal region

National Bank for Economic and Social

Development (BNDES) PAC

National Bank for Economic and Social
Development (BNDES) PAC II 9751
National Bank for Economic and Social
Development (BNDES) PAC II 9752
National Bank for Economic and Social
Development (BNDES) Onda Limpa
National Bank for Economic and Social
Development (BNDES) Tietê III
National Bank for Economic and Social

Development (BNDES) 2015

Financial leasing

Other

Interest and others charges

December 31, 2017

Current

Noncurrent

Total

Final Maturity

Interest Rates*

41,702

45,450

80,953

294,702

122,655

340,152

2020

2025

40,503

141,351

181,854

2022

346,414

345,788

692,202

2019

144,391

781,922

926,313

2023

33,020

194,872

227,892

2024

TJLP + 1.92% (1st & 3rd series) & IPCA +
9.53% (2nd series)
TR + 9.5%
TJLP + 1.92% (1st & 3rd series) & IPCA +
9.19% (2nd series)
CDI + 0.99% (1st series) & IPCA + 6.2%
(2nd series)
CDI + 0.75% (1st series) & IPCA + 4.5%
(2nd series) & IPCA + 4.75% (3rd series)
TJLP + 1.92% (1st and 3rd series) & IPCA +
8.25% (2nd series)

250,000

246,890

496,890

2019

CDI + 3.80%

499,628

2022

CDI + 0.60% & CDI + 0.90%

1,233,086

2018/2038

TR + 5% to 9.5%

33,564

2019

2.5% + TJLP

-

78,487

16,782

11,143

4,334

2,367

23,469

30,378

10,050

17,573

1,466

101,855

499,628

1,154,599

16,782

50,028

22,991

19,526

61,171

2023

27,325

2027

21,893

2027

146,461

169,930

2025

280,825

311,203

2028

397,922

544,044

9,477

-

407,972

561,617

2035

2035

10,943

2018/2025

101,855

2.15% + TJLP

1.72% + TJLP

1.72% + TJLP

1.92% + TJLP

1.66% + TJLP

2.5% + TJLP

7.73% to 10.12% + IPC
TJLP + 1.66% (FINEP) & TR + 12.00%
(Presidente Prudente)

Total denominated in local currency

1,199,384

5,228,761

6,428,145

Denominated in foreign currency:
Inter-American Development Bank (IADB)

US$527,096,000 (2016 - US$555,671,000)

International Bank for Reconstruction and

Development (IBRD) US$91,286,000 (2016 –
US$79,946,000)

Deutsche Bank – US$150,000,000 (2016 -

US$150,000,000)

Eurobonds - US$350,000,000 (2016 – US$

350,000,000)

JICA 15 - ¥ 13,829,160,000 (2016 - ¥

14,981,590,000)

JICA 18 - ¥ 12,433,920,000 (2016- ¥

13,470,080,000)

JICA 17 - ¥ 1,534,959,000 (2016- ¥

1,596,251,000)

JICA 19 - ¥ 29,777,232,000 (2016 - ¥

27,569,009,000)

115,757

1,613,358

1,729,115

2025 to 2035

2.33% to 2.74%

-

248,100

301,665

242,343

301,665

2034

490,443

2019

1.71%

Libor + 4.50%

-

1,155,331

1,155,331

2020

6.25%

33,881

30,463

2,507

372,696

406,577

2029

334,849

365,312

2029

1.8% & 2.5%

1.8% & 2.5%

41,835

44,342

2035

1.2% & 0.01%

-

873,383

873,383

2037

1.7% & 0.01%

IADB 1983AB – US$ 82,404,000 (2016 – US$

106,346,000)

Interest and others charges

79,201

37,462

189,990

269,191

2023

Libor + 1.88% to 2.38%

-

37,462

Total denominated in foreign currency

         547,371

5,125,450

5,672,821

Total loans and financing

1,746,755

10,354,211

12,100,966

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*      TR was 0.00% per month as of December 31, 2017; CDI stands for Interbank Deposit Rate (Certificado de Depósitos Interbancários), which was 6.89% per annum as of December 31, 2017; IGP‑M
was -0.52% per annum as of December 31, 2017; TJLP stands for Long‑term Interest Rate (Taxa de Juros a Longo Prazo), published quarterly by the Central Bank, which was 6.90% per annum as
of December 31, 2017; and USD LIBOR was 1.69 as of December 31, 2017.

The following table shows the maturity profile of our debt, as of December 31, 2017, for the period indicated:

Loans and financing

2018

2019

2020

2021

2022

(in millions of reais)

After
2023

Total

1,746.8

1,779.3

2,242.5

858.4

843.5

4,630.5

12,101.0

Referring  to  all  of  our  foreign  currency-denominated  indebtedness,  the  amount  of  R$3,945.8  million,  net  of  transaction  costs,  as  of
December 31, 2017 was denominated in U.S. dollars and R$1,689.6 million was denominated in Japanese Yen.  This indebtedness consisted
principally of:

·         R$1,729.1 million (US$527.1 million) in U.S. dollar denominated loans contracted with the Inter-American Development Bank, or

the IADB, composed of the following: 

(i)                  two loans to finance the first phase of the Tietê Project in 1992, one of which was terminated in December 2016

and the other terminated in December 2017;

(ii)                 one loan to finance the second phase of the Tietê Project in 2000, under which payments of principal are made in
semiannual  installments  with  final  maturity  in  July  2025.    The  principal  amount  accrues  interest  at  USD  LIBOR
plus a variable spread paid semiannually; and

(iii)          one loan to finance the third phase of the Tietê Project in 2010, under which payments of principal are made in
semiannual  installments  with  final  maturity  in  September  2035.    The  principal  amount  accrues  interest  at  USD
LIBOR plus a variable spread paid semiannually; 

·                  R$301.7  million  (US$91.3  million)  in  U.S.  dollar  denominated  loans  contracted  with  the  IBRD  which  was  entered  into  on
October 28, 2009, amounting to US$100.0 million, for the financing of the Water Source Program (Programa Mananciais).  The loan
matures in March 2034.  Repayments of principal will be made in semiannual installments starting in September 2019 after a grace
period of ten years.  The principal amount accrues interest at USD LIBOR plus a variable spread, paid semiannually;

·                 R$269.2  million  (US$82.4  million)  in  U.S.  dollar  denominated  loans  from  the  AB  Loan  financing  contracted  with  the  IADB  in
May 2008.  Under this loan, payments of principal are made in annual installments with final maturity in May 2023.  The principal
amount  accrues  interest  at  USD  LIBOR  plus  a  rate  varying  from  1.88%  to  2.38%,  paid  semiannually.    The  proceeds  were  used  to
repay an outstanding series of debt securities in connection with the implementation of our investment plan;

·                  R$1,155.3 million  (US$350.0  million)  in  U.S.  dollar  denominated  Eurobonds  issued  in  December  2010  with  an  interest  rate  of
6.25%.    The  bonds  pay  interest  semi‑annually  and  mature  in  2020.    The  proceeds  from  the  offering  were  used  to  repay  financial
commitments  throughout  2007  and  2011.  In  November  2016,  the  US$140.0  million  7.5%  notes  due  to  2016  were  completely
amortized;

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·         R$1,689.6 million (¥57,575.3 million) in Japanese yen denominated loans contracted with the JICA, composed of the following: 
(i) ¥21,320.0 million denominated loans contracted in August 2004 for the financing of the environmental recovery program for the
Baixada Santista metropolitan region, called the Clean Wave Program (Programa Onda Limpa).  Under these loans, the payments of
principal are made in semi‑annual installments with final maturity in August 2029.  The principal amount accrues interest at a rate
that varies from 1.8% to 2.5% per year, paid semiannually; (ii) ¥6,208 million in denominated loans contracted in October 2010 for
the financing of the environmental improvement program in the basin of the Billings dam.  The loan matures in October 2035, with
repayments of principal made in semiannual installments.  The principal amount accrues interest at a rate that varies from 0.01% to
1.2% per year, paid semiannually; (iii) ¥19,169.0 million denominated loans contracted in February 2011 to complement the financing
for the first stage of the Clean Wave Program (Programa Onda Limpa), with commercial conditions similar to the loan entered into in
August 2004.  These funds were used for the provision of works and services in the Baixada Santista metropolitan region.  The credit
agreement  expires  in  18  years  with  final  maturity  in  August  2029.  The  principal  amount  accrues  interest  at  a  rate  that  varies  from
1.8%  to  2.5%  per  year,  paid  semiannually;  and  (iv)  ¥33,584  million  denominated  loan  in  February  2012  for  the  financing  of  the
Corporate  Program  for  Water  Loss  Reduction  (Programa  Corporativo  para  Redução  de  Perdas).    The  loan  matures  in
February 2037.  Repayments of principal will be made in semiannual installments starting in February 2019 after a grace period of
seven years.  The principal amount accrues interest at a rate that varies from 0.01% to 1.7% per year, paid semiannually; and

·         R$490.4 (US$150.0 million), in U.S. dollar denominated loan contracted in October 2016, with Deutsche Bank AG. London Branch
and  Banco  Bradesco  S.A.,  New  York  Branch,  with  an  interest  rate  of  3-month  LIBOR  plus  4.50%  interest  per  year  and  with  final
maturity in October 2019.  Interest under this loan is paid quarterly and the principal amount is amortized in semiannual installments
after an 18 month grace period. The proceeds from the loan were used to repay the US$140.0 million Eurobond issued in November
2006, which matured in November 2016, and other financial commitments throughout 2016.  The loan agreement includes financial
covenants  requiring  our  debt  service  coverage  ratio  to  be  higher  than  2.35:1.00;  and  our  ratio  of  total  adjusted  debt  to  EBITDA,
determined on a consolidated basis, to be lower or equal than 3.65:1.00.

Our borrowings from multilateral institutions and with Government Agency, such as the IADB, IBRD and JICA are guaranteed by the
federal government, and have a counter-guarantee from the state of São Paulo.  For further information on the terms of these loan agreements,
see “Item 7.B. Related Party Transactions—Government Guarantees of Financing”.

Our outstanding domestic debt was R$6,428.2 million as of December 31, 2017 and consisted primarily of real‑denominated loans from
federal  and  state‑owned  banks,  in  particular,  Caixa  Econômica  Federal  and  BNDES,  as  well  as  debentures  issued  in  November  2009,
June 2010, February 2011, February 2012, November 2012, January 2013, October 2013, June 2014, December 2015, June 2017 and February
2018 and financial leasing.

The following summarizes our principal borrowings from federal and State‑owned banks: 

·         from 2003 to 2017, we entered into several financing agreements with Caixa Econômica Federal, pursuant to which repayments of
principal  are  paid  in  up  to  in  60,  180  or  240  months  in  monthly  installments  commencing  30  days  following  the  applicable  grace
period, which varies from 10 to 48 months from the date of signature of the line of credit agreement.  The final maturity is 2039.  The
principal amount accrues interest from 5.0% to 8.0%.  The financing agreements are collateralized (i) by collections of daily billings
of  water  supply  and  sewage  services  up  to  the  total  amount  of  the  debt,  or  (ii)  by  a  monthly  plan  of  billings  corresponding  to  the
minimum of three times the monthly charge, depending on the terms of the relevant financing agreement. As of December 31, 2017,
the outstanding debt was R$1,233.1 million; 

·         in November 2007, we entered into a R$129.9 million financing agreement with BNDES.  Repayments of the principal amount are
being made in 96 successive monthly installments, with final maturity in 2019.  The principal amount accrues interest at the TJLP, but
limited to 6.0% per year, plus 2.50% per year.  If the TJLP exceeds 6.0% per year, such excess will be added to the principal amount. 
The financing agreement is collateralized by part of the billings from the provision of water and sewage services. As of December 31,
2017, the outstanding debt was R$33.6 million;

·         in May 2008, we entered into a R$174.0 million financing agreement with BNDES.  Repayments of the principal amount are being
made  in  150  successive  monthly  installments,  with  final  maturity  in  2023.    The  principal  amount  accrues  interest  at  the  TJLP,  but
limited to 6.0% per year, plus 2.15% per year.  If the TJLP exceeds 6.0% per year, such excess will be added to the principal amount. 
The financing agreement is collateralized by part of the billings from the provision of water and sewage services. As of December 31,
2017, the outstanding debt was R$61.2 million;

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·         in March 2010, we entered into a R$294.3 million financing agreement with BNDES.  Repayments of the principal amount are being
made  in  156  successive  monthly  installments,  with  final  maturity  in  2025.    The  principal  amount  accrues  interest  at  the  TJLP,  but
limited to 6.0% per year, plus 1.92% per year.  If the TJLP exceeds 6.0% per year, such excess will be added to the principal amount. 
The financing agreement is collateralized by part of the billings from the provision of water and sewage services. As of December 31,
2017, the outstanding debt was R$169.9 million; 

·                  in  2011,  we  entered  into  financial  leases  in  the  total  amount  of  R$49.6  million  with  certain  contractors  for  the  construction  of
infrastructure on land we own.  During the construction phase, we recognize an intangible assets and the related liability of the lease
at fair value.  Upon the conclusion of the construction, we began paying the rental of the infrastructure (in 240 installments) and the
lease  was  updated  accordingly  to  the  contract.    On  August  31,  2013,  SES  Campo  Limpo  Paulista  and  Várzea  Paulista  started
operations,  and  the  corresponding  amount  as  of  December  31,  2014  was  of  R$138,602  million.  As  of  December  31,  2017,  the
outstanding debt was R$561.6 million;

·         in March 2012, we entered into a R$180.8 million financing agreement with BNDES.  Amortization of the principal amount is being
made in up to 156 successive monthly installments, with the final maturity in 2027.  The principal amount accrues interest at the TJLP
but it is limited to 6.0% per year plus a yearly 1.72%.  If the TJLP exceeds 6.0% per year, such excess will be added to the principal
amount.  This financing agreement is collateralized with a portion of the revenues from the provision of water and sewage services.
As of December 31, 2017, the outstanding debt was R$49.2 million;

·         in February 2013, we entered into a R$1.3 billion financing agreement with BNDES.  Amortization of the principal amount is being
made in up to 144 successive monthly installments with the final maturity in 2028.  The principal amount accrues interest at the TJLP
but is limited to 6.0% per year plus a yearly 1.66%.  If the TJLP exceeds 6.0% per year, such excess will be added to the principal
amount.  This financing agreement is collateralized with a portion of the revenues from the provision of water and sewage services.
As of December 31, 2017, the outstanding debt was R$311.2 million;

·         in June 2014, we entered into a R$61.1 million financing agreement with BNDES.  Amortization of the principal amount shall be
paid in up to 108 successive monthly installments after the grace period of 36 months, with the final maturity in 2026.  The principal
amount accrues interest at the TJLP but is limited to 6.0% per year plus a yearly 1.76%.  If the TJLP exceeds 6.0% per year, such
excess  will  be  added  to  the  principal  amount.    This  financing  agreement  is  collateralized  with  a  portion  of  the  revenues  from  the
provision of water and sewage services;

·         in June 2015, we entered into a R$747.4  million financing agreement with BNDES.  Amortization of the principal amount shall be
paid in up to 204 successive monthly installments after the grace period of 36 months, with the final maturity in 2035.  The principal
amount accrues interest at the TJLP but is limited to 6.0% per year plus a yearly 2.18%.  If the TJLP exceeds 6.0% per year, such
excess  will  be  added  to  the  principal  amount.    This  financing  agreement  is  collateralized  with  a  portion  of  the  revenues  from  the
provision of water and sewage services. As of December 31, 2017, the outstanding debt was R$408.0 million;  and

·                 in October 2015, we entered into a R$48.3 million financing agreement with Financier of Studies and Projects (Financiadora  de
Estudos e Projetos, or FINEP).  Repayments of the principal amount shall be paid in up in 91 successive monthly installments after
the grace period of 30 months, with the final maturity in 2025.  The principal amount accrues interest at the TJLP but it limited to
6.0% per year plus a yearly 1.5%.  If TJLP exceeds 6% per year, such excess will be added to the principal amount.  This financing
agreement is collateralized with a portion of the revenues from the provision of water and sewage services. As of December 31, 2017,
the outstanding debt was R$10.9 million.

Under the BNDES program, we issued three tranches of debentures in the aggregate amount of R$826.1 million.  In November 2009, we
issued our tenth tranche of debentures in the aggregate principal amount of R$275.4 million.  The debentures are divided in three series:  the
first  and  third  series  will  mature  in  November  2020  and  the  second  in  December  2020.    The  debentures  of  the  first  and  third  series,  in  the
aggregate principal amount of R$77.1 million and R$115.7 million, respectively, bear interest at 1.92% per year, plus the TJLP.  If the TJLP
exceeds  6.0%  per  year,  such  excess  will  be  added  to  the  principal  amount.    The  debentures  of  the  second  series,  in  the  aggregate  principal
amount of R$82.6 million, bear interest at the rate of the IPCA index plus 9.53% per year.  This issuance was entirely subscribed by BNDES. 
As of December 31, 2017 the outstanding debt of tenth issuance of debentures is R$122.7 million.  In February 2011, we issued our fourteenth
tranche of debentures, the second tranche out of those three, also subscribed exclusively by BNDES.  These debentures are divided in three
series:  the first and third series will mature in February 2022 and the second, in March 2022.  The debentures of the first and third series, in
the  aggregate  principal  amount  of  R$77.1  million  and  R$115.7  million,  respectively,  bear  interest  at  1.92%  per  year,  plus  the  TJLP.    If  the
TJLP  exceeds  6.0%  per  year,  such  excess  will  be  added  to  the  principal  amount.    The  debentures  of  the  second  series,  in  the  aggregate
principal amount of R$82.6 million, bear interest at the rate of the IPCA index plus 9.20% per year.  As of December 31, 2017 the outstanding
debt of fourteenth issuance of debentures is R$181.9 million.  In October 2013, we concluded our eighteenth issuance of debentures, the third
tranche out of those three also subscribed exclusively by BNDES.  These debentures are divided in three series:  the first and third series will
mature in October 2024 and the second, in November 2024.  The debentures of the first and third series, in the aggregate principal amount of
R$77.1 million and R$115.7 million, respectively, bear interest at 1.92% per year, plus the TJLP.  If the TJLP exceeds 6.0% per year, such
excess will be added to the principal amount.  The debentures of the second series, in the aggregate principal amount of R$82.6 million, bear
interest at the rate of the IPCA index plus 8.26% per year.  In December 2013, BNDES subscribed to the debentures of the first and second
series.    In  December  2014  and  July  2015,  BNDES  subscribed  in  part  to  the  debentures  of  the  third  series  and  will  subscribe  to  the  other
debentures  of  the  third  series  in  2018.    We  have  used  the  funds  raised  from  the  three  issuances  for  investments  primarily  in  the  Corporate
Program for Water Loss Reduction and on improvements and reforms of the Rio Grande’s water treatment plant, including other projects for
water supply and sewage collection systems in the São Paulo Northern Coast, Paraíba Valley and Mantiqueira Regions. As of December 31,
2017 the outstanding debt of eighteenth issuance of debentures is R$227.9 million.

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In June 2010, we carried out our twelfth issuance of debentures, totaling R$500 million, to the FGTS, based on the FGTS’s program to
finance companies in the sanitation, transport and real estate businesses.  The debentures will mature in June 2025 and bear monthly interest
based on the TR plus 9.5% per year. The proceeds of this issuance were used to fund a portion of our capital expenditure program in the water
supply and sewage system. As of December 31, 2017 the outstanding debt of twelfth issuance of debentures is R$340.2 million.

In February 2012, we issued our fifteenth issuance of debentures in two series in the aggregate principal amount of R$771.0 million.  The
first  and  second  series  will  mature  in  February  2017  and  2019,  respectively.    The  debentures  of  the  first  series  (in  the  aggregate  principal
amount  of  R$287.3  million)  bear  interest  at  a  rate  of  CDI  plus  0.99%  per  year.    The  second  series  (in  the  aggregate  principal  amount
R$483.7 million) bears interest at a rate of IPCA plus 6.2% per year.  The net proceeds were used to repay financial commitments throughout
2012, including the early redemption of our thirteenth debentures issuance. As of December 31, 2017 the outstanding debt of fifteenth issuance
of debentures is R$692.2 million.

In November 2012, we carried out our sixteenth issuance of debentures of R$500 million, with a maturity date of November 2015 and
bearing interest, each quarter with an interest rate of between 0.30% and 0.7% per year plus the CDI rate.  The proceeds of this issuance were
used to pay our financial commitments for 2012 and 2013.

In January 2013, we carried out our seventeenth issuance of debentures of R$1.0 billion in three series, the first for R$424.7 million with
maturity date of January 2018 and with an interest rate of 0.75% per year plus the CDI rate, the second for R$395.2 million with a maturity of
January  2020  and  with  the  interest  rate  of  4.50%  per  year  plus  IPCA  variation  and  the  third  for  R$180.1  million  with  a  maturity  date  of
January 2023 and with an interest rate of 4.75% per year plus IPCA variation.  The proceeds of this issuance were used to pay our financial
commitments for 2013. As of December 31, 2017 the outstanding debt of seventeenth issuance of debentures is R$926.3 million.

In  June  2014,  we  carried  out  our  nineteenth  issuance  of  debentures  of  R$500  million,  with  a  maturity  date  of  June  2017  and  bearing
interest, each semester with an interest rate of between 0.80% and 1.08% per year plus the CDI rate.  The proceeds of this issuance were used
to pay our financial commitments for 2014 and 2015. In March 2016, we made an extraordinary partial amortization of the nineteenth issuance
of R$300 million, and in June 2017, we repaid the remaining amount due under these debentures.

In December 2015, we carried out our twentieth issuance of debentures of R$500 million, with a maturity date of December 2019 and
bearing interest, each semester with an interest rate of 3.80% per year plus the CDI rate.  The proceeds of this issuance were used to strengthen
our cash position and refinance financial commitments which were set to mature in the first trimester of 2016. As of December 31, 2017 the
outstanding debt of twentieth issuance of debentures is R$496.9 million.

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In June 2017, we carried our twenty-first issuance of debentures in two series in the aggregate principal amount of R$500 million. The
first and second series will mature in June 2020 and 2022, respectively. The debentures of the first series (in the aggregate principal amount of
R$150 million) bear interest at a rate of CDI plus 0.60% per year. The debentures of the second series (in the aggregate principal amount of
R$350 million) bear interest at a rate of CDI plus 0.90% per year. The proceeds of this issuance shall be used to strengthen our cash position
and  refinance  financial  commitments  which  mature  in  2017.  As  of  December  31,  2017  the  outstanding  debt  of  twenty-first  issuance  of
debentures is R$499.6 million.

In February 2018, we carried our twenty-second issuance of debentures in three series in the aggregate principal amount of R$750 million.
The first, second and third series will mature in February 2021, 2023 and 2025 respectively. The debentures of the first series (in the aggregate
principal amount of R$100 million) bear interest at a rate of CDI plus 0.58% per year, with semi-annual interest payments.  The second series
(in the aggregate principal amount R$400 million) bears interest at a rate of CDI plus 0.90% per year, with semi-annual interest payments. The
third  series  (in  the  aggregate  principal  amount  R$250  million)  bears  interest  at  a  rate  of  IPCA  plus  6.00%  per  year,  with  annual  interest
payments. The proceeds from this funding are intended to strengthen our cash position and refinance outstanding financial commitments in
2018.

Part of our real‑denominated indebtedness is indexed to take into account the effects of inflation.  This debt provides for inflation‑based

increases to the principal amount, determined by reference to the IPCA.

Financial Covenants

We are subject to financial covenants under the agreements evidencing or governing our outstanding indebtedness.

Foreign currency denominated indebtedness

With  respect  to  our  indebtedness  denominated  in  U.S.  dollars,  including  our  borrowings  from  the  IADB,  we  are  subject  to  financial

covenants, including limitations on our ability to incur debt. For example:

The financial covenants in our Loan No. 1212 from the IADB require as follows:

·                  our  tariff  revenues  must  be  sufficient  to  cover  the  operational  expenses  of  our  system,  including  administrative,  operating  and

maintenance expenses, and depreciation;

·         our tariff revenues must provide a return on the balance sheet value of our property, plant, and equipment of not less than 7%; and

·         during project execution, the balance of our short-term borrowings must not exceed 8.5% of our total equity.

This contract contain an early maturity clause in the event of non-compliance on our part, of any obligation stipulated therein or in other

contracts with the bank relating to the financing of the above-mentioned projects.

The financial covenants in our AB Loan Agreements with the IADB (No. 1983AB) require as follows:

·         our debt service coverage ratio must be greater than or equal to 2.35:1.00; and

·         our ratio of Net Debt (defined as all borrowed money, including debentures and Eurobonds, less interest and financial charges that
have been provisioned for the current period) to Adjusted EBITDA (defined as our net income before net financial expenses, income
tax  and  social  contribution  tax,  depreciation  and  amortization,  non-operating  income  or  expenses,  and  extraordinary  items  net  of
income tax and social contribution, as set forth in our consolidated financial statements), each determined on a consolidated basis,
must be less than 3.65:1.00.

This contract contains an early maturity clause. In the event of non-compliance with the terms of the contract, the BID can request the
anticipated payment of part or all of the loan. The contract also contains cross-default provisions whereby an event of non-compliance on our
part relating to any other of our debts with BID or third-parties (in this case, if over US$25 million) allows BID to request the early payment of
the loan.

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In a Letter Agreement executed on September 30, 2015, the IADB irrevocably agreed not to exercise its right to accelerate its loans to us if
our ratio if Net Debt to Adjusted EBITDA is equal to or exceeds 3.65:1.00 for one fiscal quarter only during the period from September 30,
2015 to October 1, 2016. As a result, the IADB was only able to accelerate its loans to us if we breached this ratio for more than one quarter
during that period. This agreement had a cross-default clause. See Note 16 to our financial statements.

The indenture relating to our US$350.0 million 6.25% notes due 2020 prohibit, subject to some exceptions, the incurrence of additional
debt in the event that:  (i) the ratio of Adjusted Total Debt to adjusted EBITDA (as defined in the related indentures) is greater than 3.65:1.00: 
or (ii) the Debt Service Coverage Ratio (as defined in the related indentures) is less than 2.35:1.00.  This agreement has a cross-default clause,
i.e. the early maturity of any debt in connection with our loans or the loans of any of our subsidiaries in a total principal amount of US$25.0
million or more (or the corresponding amount in other currencies) shall imply this agreement’s early maturity.  See Note 16 to our financial
statements included in this annual report. In November 2016, the US$140.0 million 7.5% notes due 2016 were completely amortized.

Any significant devaluation of the real will affect the total portion of our debt denominated in foreign currencies when measured in reais. 
As a result, the Adjusted Total or Net Debt in reais will be affected, with consequent impact on the ratio between Adjusted Total or Net Debt to
adjusted EBITDA.

As of December 31, 2017 and 2016, we had met all the requirements set forth by these loans and financing agreements.

Local currency denominated indebtedness

With respect to our outstanding indebtedness denominated in reais, we are subject to financial covenants.

The covenant clauses apply to all of SABESP’s indebtedness with BNDES, including the 10th, 14th, and 18th issuances of debentures
held  by  BNDES,  which  totaled  R$1,504.2  million  as  of  December  31,  2016.    The  only  financing  agreement  which  is  exempt  from  the
renegotiated financial is contract No. 08.2.0169.  See Note 16 (a) (ii) to our financial statements included in this annual report.

  In  summary,  the  BNDES  financings  specify  two  bands  for  the  ratios  of  Adjusted  Net  Debt  /  Adjusted  EBITDA,  Adjusted  EBITDA  /
Adjusted Financial Expenses, and Other Onerous Debt / Adjusted EBITDA.  The financings also specify a collateral mechanism by which we
assign a portion of its tariff payment receivables to BNDES in order to provide a partial guarantee of the amounts due under the financings. 
Under this mechanism, each month we must ensure that a portion of the tariff payments which we receive are deposited on a daily basis into a
blocked collateral account, before being released to a regular movements account later in the day provided that BNDES has not notified the
bank  that  we  are  in  default.    If  the  ratio  of  Adjusted  EBITDA  /  Adjusted  Financial  Expenses  is  equal  to  or  higher  than  3.50,  the  ratio  of
Adjusted Net Debt / Adjusted EBITDA equal to or lower than 3.00, and the Other Onerous Debt / Adjusted EBITDA equal to or lower than
1.00,  the  amount  that  must  pass  through  this  blocked  collateral  account  is  R$225.9  million  per  month.    If  one  of  the  three  aforementioned
ratios  are  not  met  in  any  two  or  more  quarters,  consecutive  or  not,  within  a  twelve-month  period,  yet  remain  within  the  following  band  of
ratios:    Adjusted  EBITDA  /  Adjusted  Financial  Expenses  lower  than  3.50  but  equal  to  or  higher  than  2.80,  Adjusted  Net  Debt  /  Adjusted
EBITDA equal to or lower than 3.80 but higher than 3.00, and Other Onerous Debt / Adjusted EBITDA equal to or lower than 1.30 but higher
than 1.00,  the amount that must pass through the blocked collateral account is automatically increased by 20%. 

The current covenant clauses are: 

A.      Maintenance of the following ratios, calculated quarterly and relative to amounts accumulated over the last 12 months at the time of

disclosure of reviewed quarterly financial statements or audited annual financial statements:

·         Adjusted EBITDA / Adjusted Financial Expenses equal to or higher than 3.50;

·         Adjusted Net Debt / Adjusted EBITDA equal to or lower than 3.00; and

·         Other Onerous Debt / Adjusted EBITDA equal to or lower than 1.00 (where “Other Onerous Debt” is equal to the sum of (i)

social security liabilities and health care plans, (ii) installment payments of tax debt and (iii) installment payments of debt with
electricity providers).

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B.    If any one of the ratios specified in A. above are not met in any two or more quarters, consecutive or not, within a twelve-month

period, we shall be deemed to be in non-compliance with the first band ratios and must, as a result, automatically increase the amount
passing through the blocked collateral account by 20%, provided that the following second band ratios are met:

·         Adjusted EBITDA / Adjusted Financial Expenses lower than 3.50 but equal to or higher than 2.80;

·         Adjusted Net Debt / Adjusted EBITDA equal to or lower than 3.80 but higher than 3.00; and

·         Other Onerous Debt / Adjusted EBITDA equal to or lower than 1.30 but higher than 1.00.

C.    If any one of the second band ratios specified in B. above are not met for any one quarter, or if we are required to but fails to ensure
that the increased monthly amount specified in B. above passes through the blocked collateral account, then we shall be deemed to be
in non-compliance with its ratio covenants, in which case BNDES may at its discretion: 

·         require us to provide additional financial guarantees within a deadline specified by BNDES, which may not be less than 30 days;

·         suspend the release of funds; and/or

·         declare the financings to be immediately due and payable.

As of December 31, 2017, the amount that must pass through the blocked collateral account is R$225.9 million per month, not including

the financial guarantees for financing contract No. 08.2.0169.1.

The financial covenants applicable to financing contract No. 08.2.0169.1 are the following:

·         Adjusted EBITDA / Adjusted Net Operational Revenue equal to or higher than 38%;

·         Adjusted EBITDA / Adjusted Financial Expenses equal to or higher than 2.35; and

·         Adjusted Net Debt / Adjusted EBITDA equal to or lower than 3.20.

BNDES  will  annually  verify  the  maintenance  of  the  aforementioned  ratios  for  contract  08.2.0169.1  by  reviewing  our  audited  annual
financial  statements,  which  must  be  presented  to  BNDES  or  published  by  April  30  of  the  following  year  to  which  the  financial  statements
refer.    If  we  maintain  all  of  the  financial  covenants  for  contract  08.2.0169.1,  BNDES  shall  reduce  the  interest  charged  in  such  financing
contract from 2.15% to 1.82% per annum.  If the financial covenants are maintained, the interest rate is reduced as of June 16 of the same year
in which the financial covenants were verified until June 15 of the subsequent year.

The financing agreement established with BNDES in March 2010 is subject to a cross-default clause.  For example, the early maturity of
any of our debts, the financial contracts and/or amounts of which may compromise the obligations stipulated in the indenture shall cause the
early maturity of such agreement.

Our  financing  agreements  with  Caixa  Econômica  Federal  do  not  contain  material  financial  covenants.    The  agreement  with  Caixa

Econômica Federal has a cross-default clause.  See Note 16 to our financial statements included in this annual report.

With respect to our outstanding debentures, the twelfth issuance requires us to maintain an Adjusted Current Ratio (current assets divided
by  current  liabilities,  excluding  from  current  liabilities  the  current  portion  of  noncurrent  debts  incurred  by  us  that  is  recorded  in  current
liabilities) higher than 1.0:1.0 and an EBITDA/Financial Expenses Ratio equal to or higher than 1.5:1.0.  The twelfth debenture issuance has
an early maturity clause, which is triggered if our credit ratings are downgraded two levels below the “brAA-” Brazil National Scale rating
assigned to our debentures by the credit rating agency S&P at the time of their issuance. On January 12, 2018, our credit rating and the one
assigned to the twelfth debenture issuance by S&P were both “brAA-”. This issuance has a cross-default clause.  See Note 16 to our financial
statements included in this annual report.

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The tenth, fourteenth and eighteenth issuances follow the covenants set forth with BNDES, as described above, and contain a cross-default

clauses.  See Note 16 to our financial statements included in this annual report.

The fifteenth, seventeenth,  nineteenth and twentieth issuances require us to maintain an EBITDA/paid financial expenses ratio equal to or
higher than 1.5:1.0 and an adjusted total debt/EBITDA ratio equal to or lower than 3.65:1.0.  These issuances have a cross-default clause.  See
Note 16 to our financial statements.

The table below shows the more restrictive covenants ratios and our financial covenants ratios as of December 31, 2017.

The  twenty-first  and  twenty-second  issuances  require  us  to  maintain  an  EBITDA/paid  financial  expenses  ratio  equal  to  or  higher  than
1.5:1.0 and an adjusted net debt/EBITDA ratio equal to or lower than 3.50:1.0.  These issuances have a cross-default clause.  See Note 16 to
our financial statements.

Adjusted EBITDA / Adjusted financial expenses
Adjusted net debt / Adjusted EBITDA
Adjusted total debt / Adjusted EBITDA
Other onerous debt1/ Adjusted EBITDA
Adjusted current ratio
EBITDA/Paid financial expenses
Net debt/Adjusted EBITDA

Restrictive Ratios
Equal to or higher than 2.80:1.00
Equal to or lower than 3.80:1.00
Lower than 3.65:1.00
Equal to or lower than 1.30:1.00
Higher than 1.0
Equal to or higher than 2.35:1.00
Equal to or lower than 3.50:1.0

Ratio as of December 31, 2017
7.55
1.89
2.27
0.56
1.45
7.79
1.84

(1)     “Other Onerous Debts” correspond to the sum of social security liabilities, health care plan, installment payment of tax debts and installment payment of debts with the

electricity supplier.

As of December 31, 2017 and 2016, we had met all the requirements set forth by these loans and financing agreements.

Capital Requirements

We have, and expect to continue having, substantial liquidity and capital resource requirements.  These requirements include debt‑service
obligations,  capital  expenditures  to  maintain,  improve  and  expand  our  water  and  sewage  systems,  and  dividend  payments  and  other
distributions to our shareholders, including the State.

Capital Expenditures

Historically, we have funded and plan to continue funding our capital expenditures with funds generated by operations and with long-term
financing  from  international  and  national  multilateral  agencies  and  development  banks.    We  generally  include  in  our  capital  expenditure
program for the following year the amount of investment that was not realized in the previous year.  In 2017, we recorded R$3.4 billion to
improve and expand our water and sewage system and to protect our water sources in order to meet the growing demand for water and sewage
services in the state of São Paulo. We have budgeted investments in the amount of approximately R$17.3 billion from 2018 through 2022.  See
“Item 4.A. History and Development of the Company—Capital Expenditure Program”.

Dividend Distributions

We are required by our bylaws to make dividend distributions, which can be made as payments of interest on shareholders’ equity to our
shareholders in an amount equal to or higher than 25% of the amounts available for distribution.  In addition, our dividend policy, which was
approved  at  the  annual  shareholders’  meeting  held  on  April  27,  2018,  establishes  that  this  percentage  shall  be  maintained  until  the
universalization of basic sanitation services in the areas where we operate. We declared dividends of R$703.9 million,  R$823.5  million  and
R$149.9 million in 2017, 2016 and 2015, respectively.  See “Item 7.B. Related Party Transactions—Dividends”.

C.      Research and Development, Patents and Licenses, Etc. 

Our  policy  is  to  invest  continually  in  the  modernization  of  equipment  and  identify  and  evaluate  the  technology  needed  to  improve  our
provision  of  basic  sanitation  services  while  promoting  environmental  protection  and  maintaining  our  competitiveness  and  profitability.    In
2017, 2016 and 2015, we invested R$10.7 million, R$11.9 million and R$14.7 million, respectively, in research and development.

With respect to our partnership with FAPESP to develop and support research projects involving researchers from graduate schools, the
State of São Paulo and our employees, the projects are equally financed by us and FAPESP.  Under this partnership, two phases of projects
were carried out.  In the first phase, 10 projects have been approved and 9 of them have been executed and concluded.  They are related to:  (i)
the development of technology related to the use of membrane filtration in water and sewage treatment, (ii) alternatives for the treatment, use
and disposal of sludge from water and sewage treatment plants, (iii) new technologies for the implementation, operation and maintenance of
water  distribution  and  sewage  collection  systems,  (iv)  new  technologies  for  improvements  in  unitary  operations  processes,  (v)
monitoring water quality; (vi) energy efficiency and (vii) the sanitary economy.

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Some of nine projects concluded in the first round have led to several patents and software registrations requests, including:

·                  “Use  of  Autonomous  Microlaboratories  to  Monitor  Phosphorus  in  Real  Time”  –  This  project  consists  of  the  development  of  a

microlaboratory to detect phosphorus in water bodies using a more efficient method than traditional processes;

·                  “Intensive  Monitoring  of  São  Paulo  Metropolitan  Region  Reservoirs,  with  emphasis  on  cyanobacteria  and  its  correlation  with
physical and chemical parameters:  the  Billings case” – One of the results of this project was the development of a forecasting model
to determine the concentration of cyanobacteria in water sources; and

·         “Specialized System for the Detection and Diagnosis of Leaks in Urban Water Lines” – This project represents the first phase of the
development  of  a  water  leakage  detection  system  with  less  dependence  on  manual  detection  by  the  field  operators.    The  acoustic
signals  derived  from  the  leak  are  recorded  on  a  portable  GPS  device  that  generates  a  database  to  be  posteriorly  correlated  and
analyzed.

Some  of  the  research  institutions  with  whom  we  have  partnered  on  the  abovementioned  projects  are  the  University  of  São  Paulo
(Universidade  de  São  Paulo  -  USP),  the  Aeronautic  Technical  Institute  (Instituto  Tecnológico  de  Aeronáutica  -  ITA),  São  Paulo  State
University (Universidade  Estadual  Paulista  –  UNESP),  Federal  University  of  São  Paulo  –  UNIFESP,  and  the  National  Institute  of  Spacial
Research (Instituto Nacional de Pesquisas Espaciais – INPE).

In  May  2013,  we  launched  the  second  phase  of  our  agreement  with  FAPESP.    In  this  second  phase,  the  seven  lines  of  research  were
defined in greater detail in order to precisely contemplate our needs.  In this phase, 37 proposals were submitted, 10 proposals were approved
according to the technical-scientific criteria and eight of them had their agreements signed in 2015, as follows:

·         Development of a National Correlated Signal Optimized for Locating and Detecting Leaks in Underground SABESP Water Pipes -

UNESP;

·         Development of an Aerobic Granular Sludge for Simultaneous Removal of Organic Matter, Nitrogen and Phosphorous from Sanitary

Sewage – USP;

·         Sewage Sludge Composting:  Evaluation of the Process, Generated Product and its Costs - UNESP;

·         Diagnosis, Management and New Treatment Alternatives – USP;

·         Saxitoxins in Water Supply:  Production of Analytical Standards, Development of Analytical Methodologies and the Degradation

Study – USP;

·         Feasibility of the Use of Water Treatment Sludge as Landfill Cover Material and in the Construction of Compacted Soil Landfills -

USP;

·         Online Analysis of Water Quality – USP; and

·         Separation Systems by Membranes for the Public Supply of Water:  Hiring Projects Mechanisms and Treatment of Contaminated

Underground Water – USP.

In 2015, we entered into a financing agreement with FINEP, for the “Sabesp – Technological Innovations for the Sanitation Sector” plan. 
This  plan  is  part  of  the  “FINEP  Innovates  Brazil”  program  and  aims  at  supporting  Brazilian  companies’  plans  for  strategic  investment  in
innovation.    This  plan  must  detail  a  company’s  targets  and  goals  for  the  period  during  which  they  will  receive  financing,  pursuant  to  the
Federal Government’s “Greater Brazil Plan – PBM”.  This plan consists of four projects, whose costs total approximately  R$60  million, as
follows:  (i) production system for reused water in urban and industrial uses; (ii) biofiltration units for odor control; (iii) sludge dryer based on
solar radiation for sewage treatment plants in the city of Franca, Franca Sewage Treatment Plant; and (iv) plasma gasification system for solid
waste from sewage treatment plants in the Barueri Sewage Treatment Plant.

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We  also  entered  into  an  agreement  with  the  Fraunhofer  Institute  in  Germany  in  2011  in  order  to  obtain  biomethane  from  the  sewage
treatment process to be used as fuel for cars  The objective is to mobilize a fleet of 49 cars using biomethane fueled by a sewage treatment
process instead of gasoline.  This project has been delayed due to a judicial dispute between the supplier of the equipment and the Fraunhofer
Institute which has temporarily impeded the importation of equipment donated by the Fraunhofer Institute.  In 2016, we received the imported
equipment.    In  2017,  we  completed  the  construction  and  installation  of  equipment,  and  started  testing  the  technology.  Full  operation  is
expected to begin in 2018.

In 2016, we signed a technical cooperation agreement with Magni, a representative of the Danish company Liqtech, aiming to test cutting

edge ceramic ultra-filtering membranes to treat residual water in our water treatment plants.  Tests were completed in 2017.

In 2016, we also formalized a Memorandum of Understanding with the Danish Water Forum (“DWF”), aiming to enhance technological
cooperation to create pilot projects that seek to make our treatment plants more energy-efficient and to fight water loss through the creation of
“Measure and Control Districts”, areas of the distribution network temporarily or permanently closed to measure the amount of water entering
or leaving. As part of this cooperation, in 2017 a workshop was held to present the loss reduction technologies used by Danish companies in
the management of water supply networks.

Seeking energy efficiency in our operations, we established a procedure to calculate the oxygen transfer rate in air diffusers dissolved in
sewage treatment plants.  The project also aims to find the best cleaning period and when these devices would have to be replaced.  The tests
conducted  at  our  pilot  sewage  treatment  plant  were  concluded  in  2017.  In  2018,  we  expect  to  conclude  the  evaluation  of  operational  and
quality results as well as the elaboration of technical reports in order to reach a final conclusion regarding the feasibility of replicating this
technology in other sewage treatment plants.

In 2017, we signed a Term of Commitment with the Federal University of Minas Gerais (Universidade Federal de Minas Gerais –
UFMG), through the university’s Department of Sanitary and Environmental Engineering, aiming to continue the project entitled “Evaluation
of the potential energy utilization of biogas generated in anaerobic reactors as applied to domestic sewage treatment in Brazil” at the Várzea
Paulista Sewage Treatment Plant. Measurements and assessments of biogas production are currently in process.

In 2017, we also signed a Memorandum of Understanding with ino3W Ltd. with the specific purpose of exchanging knowledge and
experience aimed at potentially establishing a partnership in the area of technological development. Ino3W Ltd. hosts a platform on which
large water and sanitation utility providers in several countries can collaborate to find efficient solutions through partnerships with global
innovative technology providers, entrepreneurs and water and sanitation companies.

We  also  have  developed  custom  made  biofilters  to  reduce  the  odor  from  sewage  pumping  stations  and  sewage  treatment  plants.
 Additionally,  we  have  projects  linked  to  the  quality  and  treatment  of  water,  including  projects  that  focus  on  particularly  hard  to  remove
chemical components, and projects that focus on machinery used to control the water treatment process in our treatment plants.

In  our  sewage  collection  and  treatment  plants,  we  have  projects  that  seek  to  automotize  operational  processes  and  develop  alternative
technologies not used or rarely used in Brazil, such as the use of ultraviolet technology in the disinfection of water planned to be re-used and
the use of activated charcoal to minimize odors generated by the sewage collection process in cities.

We publish DAE Magazine, our company’s quarterly engineering journal which has now totaled over 200 editions since its inauguration.
This journal’s publication began in 1936 under the title Bulletin of the Water and Sewage Department – RAE (Boletim da Repartição de Aguas
e  Esgotos  –  RAE).  The  journal  has  a  specialized  staff  and  is  currently  accredited  by  the  Qualis  /  CAPES  system  under  the  category  “B2.”
Through  the  journal’s  publication  of  technical  and  scientific  articles  on  basic  and  environmental  sanitation,  we  aim  to  ensure  that
improvements in processes, innovations and technological advances aid in the construction of universalized and sustainable sanitation, which
in  addition  to  the  implementation  of  infrastructure,  generate  social-environmental  solutions  to  improve  the  quality  of  life  and  health  of  the
Brazilian population.

D.      Trend Information 

Several factors may affect our future results of operations, liquidity and capital resources, including:

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·         the interests of our controlling shareholder;

·         our potential corporate reorganization, as approved by State Law No. 16,525 on September 15, 2017;

·                 regulations issued by ARSESP regarding several aspects of our business, with respect to our ability to adjust our tariffs and the

competency of state and municipalities to manage their sanitation affairs;

·         Brazilian economic conditions;

·         the effects of extreme weather events;

·         the effects of any continuous international financial turmoil that may affect liquidity in the Brazilian capital and lending markets;

·         the effects that further changes in the Basic Sanitation Law and its interpretation may have on the basic sanitation industry in Brazil

and on us;

·         the effects of inflation in our results of operations;

·         the effects of fluctuations in the value of the Brazilian real and in interest rates on our net interest income;

·         the renewal of our concession agreements;

·                 the impact on our business of  lower water consumption practices adopted by our customers during the water crisis, which may
remain in place despite the discontinuation of the measure we adopted to serve the São Paulo metropolitan region during the water
crisis;

·         investments made, by some sectors, during the water crisis in search of alternative sources of supply, such as the drilling of artesian

wells, the reuse of water and the use of rainwater;

·         the May 2017 renewal of the concession that regulates the volume of water that may be extracted from the Cantareira System, the
main  water  system  we  use  to  serve  the  São  Paulo  metropolitan  region,  based  on  the  volume  of  water  available  in  the  reservoirs
divided  into  five  tranches:  (i)  if  the  volume  of  water  available  is  higher  than  60%  of  the  reservoirs’  capacity,  we  can  draw  up  to
33m3/s; (ii) if the volume of water is between 40% and 60% of the reservoirs’ capacity, we can draw up to 31m3/s; (iii) if the volume
of water is between 30% and 40% of the reservoirs’ capacity, we can draw up to 27m3/s; (iv) if the volume of water is between 20%
and 30% of the reservoirs’ capacity, we can draw up to 23m3/s; and (v) if the volume of water available is lower than 20% of the
reservoirs’ capacity, we can draw up to 15.5m3/s;

·         any measures that we may be required to take to ensure the provision of water to our customers; and

·         the formalization of agreements with certain of the municipalities we serve.

Some of these factors are described in more detail under “5.A. Operating and Financial Review and Prospects”.

In addition, you should read “3.D. Risk Factors” for a discussion of the risks we face in our business operations, which could affect our

business, results of operations or financial condition.

E.      Off‑Balance Sheet Arrangements

We had no off‑balance sheet arrangements as of December 31, 2017.

F.       Tabular Disclosure of Contractual Obligations

Our debt obligations and other contractual obligations as of December 31, 2017 were as follows:

Loans and financing
Estimated interest payments(1)
Accounts payable to suppliers and
contractors
Services payable
Program contract commitments
Purchase obligations(2)
Total

Less than 1 year

1‑3 years

3‑5 years
(in millions of reais)

   More than 5 years   

Total

1,746.8   

474.9

344.9
408.3   
128.8   
3,239.2   
6,342.9   

4,021.8   

947.2   

-
-
108.1   
3,273.1   
8,350.2   

1,701.9

510.2

-
-
16.8
1,412.9
3,641.8

4,630.5   

904.1   

-
-
16.0   
7,186.9   
12,737.5   

12,101.0

2,836.4

344.9
408.3
269.7
15,112.1
31,072.4

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(1)     Estimated interest payments on loans and financing were determined considering the interest rates as of December 31, 2017.  However, our loans and financing are
subject to variable interest indexation and foreign exchange fluctuations, and these estimated interest payments may differ significantly from payments actually made.
 The debt agreements have cross-default clauses.

(2)     The purchase obligations are the contractual obligations of investments and expenses.

We  believe  that  we  can  meet  the  maturity  schedule  through  a  combination  of  funds  generated  by  operations,  the  net  proceeds  of  new
issuances of debt securities in the Brazilian and international capital markets and additional borrowings from domestic and foreign lenders. 
Our  borrowings  are  not  affected  by  seasonality.    For  information  concerning  the  interest  rates  on  our  indebtedness  outstanding  as  of
December 31, 2017, see Note 16 to our financial statements as of December 31, 2017 and 2016 and for the years ended December 31, 2017,
2016, 2015 included elsewhere in this annual report.

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ITEM 6.            DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES

A.      Directors and Senior Management

Under our bylaws and Brazilian Corporate Law, we are managed by our board of directors (Conselho de Administração), which currently

consists of ten directors, and a board of executive officers (Diretoria), which currently consists of six executive officers.

As our controlling shareholder, the State has the ability to elect the majority of our board of directors and, therefore, our direction and
future operations.  Upon the election of a new State governor and any resulting change in the administration of the State, all or some of the
members of our board of directors, including our chairman, have historically been replaced by designees of the new administration. Our board
of directors may in turn replace some or all of the executive officers. See “Item 3.D. Risk Factors—Risks Relating to Our Control by the State
of  São  Paulo—We  are  controlled  by  the  State  of  São  Paulo,  whose  interests  may  differ  from  the  interests  of  non-controlling  shareholders,
including holders of ADSs”.

Board of Directors

Our  bylaws  provide  for  a  minimum  of  seven  and  a  maximum  of  11  directors.    The  members  of  our  board  of  directors  are  elected  at  a
general  shareholders’  meeting  to  serve  a  two-year  term.    Such  terms  may  be  renewed  three  consecutive  times.  Pursuant  to  our  bylaws,  our
employees have the option to elect one member of our board of directors.  Currently, our employees have not elected a director. In addition,
pursuant  to  Law  No.  6,404/1976  of  December  15,  1976,  as  amended  (“Brazilian  Corporate  Law”),  at  least  one  member  of  the  board  of
directors of mixed capital companies, such as us, must be appointed by the minority shareholders.  Finally, according to the Novo Mercado
rules and Federal Law No. 13,303/16, at least two, or 25.0%, of the board of directors must be comprised of independent members.

All the current members of our board of directors were elected at the annual shareholders’ meeting held on April 27, 2018, except for
Karla Bertocco Trindade who joined our board of directors on May 14, 2018 when she was appointed our Chief Executive Officer. The tenure
of all the directors will end upon the election of members for the new term at the annual shareholders’ meeting in 2020.  Currently, we have
seven members considered independent under the Novo Mercado rules and Federal Law No. 13,303/16.

Our board of directors ordinarily meets once a month or, when necessary for the interests of our company, when called by a majority of
the  directors  or  the  chairman.    Its  responsibilities  include  the  establishment  of  policy  and  general  orientation  of  our  business,  and  the
appointment and supervision of our executive officers.

The following are the names, ages, positions, dates of election and brief biographical descriptions of the current members of our board of

directors elected at the shareholders’ meeting on April 27, 2018 and, in the case of Karla Bertocco Trindade, on May 14, 2018:

Director

Mario Engler Pinto Junior
Karla Bertocco Trindade
Jerônimo Antunes
Reinaldo Guerreiro
Francisco Vidal Luna
Luís Eduardo Alves de Assis
Francisco Luiz Sibut Gomide
Lucas Navarro Prado
Ernesto Rubens Gebcke
Rogério Ceron de Oliveira

Age
61
41
62
64
71
61
72
37
74
37

Position

Chairman
Member
Independent Member*
Independent Member*
Independent Member*
Independent Member*
Independent Member*
Independent Member*
Independent Member*
Member

Date Elected
April 27, 2018
May 14, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018

*      These members comply with the independence requirements established by the Novo Mercado rules.

Mario Engler Pinto Junior. Mr. Pinto has been the Chairman of our board of directors since April 2018.  Mr. Pinto holds a law degree and
PhD in Commercial Law from the University of São Paulo (Universidade de São Paulo – USP). He is the CEO and a member of the board of
directors of the São Paulo Partnership Company (Companhia Paulista de Parcerias - CPP),  a  member  of  the  State  Capital  Protection  Board
(Conselho  de  Defesa  dos  Capitais  do  Estado  -  CODEC),  chief  advisor  on  public  and  corporate  finance  to  the  Treasury  Department,  an
arbitrator  for  the  B3  Arbitration  Chamber,  a  member  of  the  Advisory  Chamber  for  the  Governance  Market  for  State-Owned  Companies
(Mercado de Governança de Estatais) and a member of the Fiscal Council for the Luso-Brazilian Bank (Banco Luso-Brasileiro).  He is also a
professor at the bachelor’s and master’s levels and for a specialization course at the Getúlio Vargas Foundation (Fundação Getúlio Vargas –
FGV), where he also conducts legal research regarding contractual and corporate arrangements in the public and private sector and serves as
coordinator of the professional master’s degree program. He has been an active lawyer since 1979 and served as a São Paulo State Attorney
from 1984 to 2014. He was also a member of the Energy Council for the Regulatory Agency of Sanitation and Energy for the State of São
Paulo (Conselho de Orientação de Energia da Agência Reguladora de Saneamento e Energia do Estado de São Paulo) from 2008 to 2010, a
member of our board of directors from 2006 to 2011, a member of our audit committee from 2006 to 2009, a member of the board of directors
for  the  Brazilian  Institutue  of  Corporate  Governance  (Instituto  Brasileiro  de  Governança  Corporativa  –  IBGC)  from  2004  to  2006,  Deputy
Attorney General for the State of São Paulo from 2000 to 2003 and a member of the board of directors for the airline Viação Aérea São Paulo
from 2000 to 2001.

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Karla Bertocco Trindade.  Mrs. Trindade has been our Chief Executive Officer and a member of our board of directors since May 2018.
She holds a Bachelor’s degree in Public Administration from the Getúlio Vargas Foundation (Fundação Getúlio Vargas - FGV), a Bachelor’s
degree in Law from the Pontificial University of São Paulo (Pontifícia Universidade Católica de São Paulo – PUC-SP) and a post-graduate
degree  in  Administrative  Law  from  FGV.  She  was  Undersecretary  of  Partnerships  and  Innovation  at  the  Secretariat  of  the  São  Paulo  State
Government, responsible for coordinating different public-private partnerships and concession projects in the State of São Paulo between 2015
and 2018, Director General of the State of São Paulo Regulatory Agency for Delegated Transportation Public Services (Agência Reguladora de
Serviços Públicos Delegados de Transporte do Estado de São Paulo - ARTESP) between 2011 and 2015, and Director of Institutional Relations
of the State of São Paulo Regulatory Agency for Sanitation and Energy (Agência Reguladora de Saneamento e Energia do Estado de São Paulo
- ARSESP) between 2008 and 2010. She also worked as Advisor to the President of our company between 2003 and 2006.

Jerônimo Antunes.  Mr. Antunes has been an independent member of our board of directors and Coordinator of the Audit Committee since
April  2008.    He  holds  a  Bachelor’s  degree  in  Business  Administration  and  Accounting  and  both  a  Masters’  degrees  and  a  doctorate  in
Controllership  and  Accounting  from  the  Business,  Economics  and  Accounting  School  at  the  University  of  São  Paulo  (Universidade  de  São
Paulo - USP).  He has been a professor of several MBA courses at the Foundation Institute of Accounting, Actuary and Financial Research
(Fundação Instituto de Pesquisas Contábeis, Atuariais e Financeiras - FIPECAFI) and at the Foundation Institute of Administration (Fundação
Instituto de Administração - FIA), among other institutions.  Mr. Antunes has acted as an independent auditor from 1977 to 2005 and as an
expert and specialist in accounting examinations since 2005. He was a member of the board of directors and a member of Finance, Risks, and
Contingencies  committee  of  Paranapanema  S.A.  from  October  2016  to  August  2017  and  he  has  been  a  member  of  the  audit  committee  of
Paranapanema  S.A.  since  November  2017.  He  has  been  member  of  the  audit  committee  of  Desenvolve  SP  since  April  2013  and  was  the
president  of  its  audit  committee  from  April  2013  to  February  2017.  Since  July  2015,  he  has  been  an  independent  member  of  the  board  of
directors,  a  member  of  the  audit  committee  (acting  as  president  since  September  2016)  and  a  member  of  compensation  and  succession
committee of Petróleo Brasileiro S.A. - Petrobras. He has been an independent member of the board of directors and the President of the audit
committee of Petrobras Distribuidora S.A. since August 2016. Mr. Antunes has also been a member of the board of trustees of FIPECAFI since
April 2017, and an alternate member of the fiscal council of Companhia Brasileira de Distribuição since April 2017. He is a member of IBGC
and  was  an  executive  officer  of  the  Institute  of  Accounting,  Actuary  and  Financial  Research  (Instituto  de  Pesquisas  Contábeis,  Atuariais  e
Financeiras- IPECAFI), the Brazilian Institute of Independent Auditors (Instituto Brasileiro de Auditores Independentes – IBRACON) and the
National  Association  of  Executives  in  Finance,  Administration  and  Accounting  (Associação  Nacional  de  Executivos  de  Finanças,
Administração e Contabilidade– ANEFAC).

Reinaldo Guerreiro.  Mr. Guerreiro has been an independent member of our board of directors since January 2007 and a member of our
Audit Committee from January 2007 to May 2017.  He holds a doctorate in Accounting and Controllership, a Master’s degree in Accounting
and Controllership and a Bachelor’s degree in Accounting Sciences, all of them from the Business, Economics and Accounting School at the
University of São Paulo (Universidade de São Paulo - USP).  Currently, he is a professor and Deputy Head of the Accounting Department at
the  Business,  Economics  and  Accounting  School  at  USP.    He  has  authored  books  in  management  accounting  and  has  published  various
scientific articles in domestic and international magazines.  He is a specialized consultant in financial management.  Mr. Guerreiro has worked
on  various  projects  in  the  areas  of  financial  management,  costs,  budget  and  IT  in  a  variety  of  companies,  such  as  Banco  do  Brasil,  Caixa
Econômica Federal, Previ and for the São Paulo Government - GESP.

Francisco Vidal Luna.  Mr. Luna has been an independent member of our board of directors since April 2013 and a member of our Audit
Committee from April 2013 to September 2016.  He has a doctorate in Economics from the Business, Economics and Accounting School at
the University of São Paulo (Universidade de São Paulo - USP) and is a retired professor of the same university.  In the public sector, he has
served as the Secretary of Planning for the state and city of São Paulo.  He has also worked at the Treasury Department for the State of São
Paulo and the Federal Planning Bureau, among other roles.  Within the private sector, Mr. Luna was Chairman and President of Banco Inter
American Express S.A.  At the governmental level, he served as a member of the advisory board of the Superintendency for the Development
of the Northeast (Superentendência de Desenvolvimento do Nordeste – Sudene), a member of the board of directors of BNDES; superintendent
of the Planning Institute of the Federal Planning Bureau, Special Secretary for Economic Affairs of the Federal Planning Bureau.  At the state
level, Mr. Luna has also been the Chairman of the Advisory Board for the division of Economic Affairs of the Secretariat of Finance of the
State  of  São  Paulo  and  Executive  Secretary  of  the  Board  of  Financial  Coordination  of  São  Paulo.    Currently, Mr. Luna is a member of the
board of directors and the audit committee of Develop São Paulo (Desenvolve SP), a member of the board of directors and the audit committee
of Gafisa S.A., a member of the board of directors of Tenda S.A., Chairman of the board of directors of IDBRASIL and the Afro-Brazilian
Museum, a member of the board of trustees of the Father Anchieta Foundation (Fundação Padre Anchieta) and an advisory board member of
the Foundation of Medical Faculty (Fundação Faculdade de Medicina – FFM).

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Luís Eduardo Alves de Assis.  Mr. Assis has been an independent member of our Board of Directors since April 2014 and a member of our
Audit Committee since September 30, 2016.  He holds a degree in Economics from the University of São Paulo (Universidade de São Paulo -
USP), a Master’s degree from the State University of Campinas (Universidade Estadual de Campinas – UNICAMP) and an MBA from Scuola
Superiore Enrico Mattei in Milan, Italy.  He was director of Monetary Policy of the Central Bank of Brazil and a professor in the Department
of Economics at the Pontificial University of São Paulo (Pontifícia Universidade Católica de São Paulo - PUC-SP) and at the Getulio Vargas
Foundation (Fundação Getulio Vargas - FGV-SP).  He has developed his long career in the financial market, having held the positions of Chief
Economist and Investment Director at Citibank, Chief Executive Officer at HSBC Investment Bank Brasil, Chief Executive Officer at HSBC
Asset Management, Chief Operating Officer at HSBC Bank Brasil, Senior Strategic Planning Executive at the HSBC Group in London and
Local Director for Latin America at HSBC. Currently,  he  serves  as  the  President  of  Fator  Seguradora  and  as  vice-president  of  the  Fernand
Braudel Institute of World Economics council. He also writes an opinion column for the newspaper O Estado de São Paulo.

Francisco  Luiz  Sibut  Gomide      Mr.  Gomide  has  been  an  independent  member  of  our  board  of  directors  since  April  2017  and  was  a
member of our Audit Committee from May 2017 to August 2017. He holds a Bachelor’s degree in Civil Engineering and Economic Sciences
from  the  Federal  University  of  Paraná  (Universidade  Federal  do  Paraná)  and  a  PhD  in  Hydrology  and  Water  Resource  from  the  Colorado
State University. He was Minister of Mines and Energy in 2002, President of ESCELSA – Espírito Santo Centrais Elétricas S.A. between 1995
and 2001, President of the Energy Company of Mato Grosso do Sul between 1997 and 2001, General Manager of Itaipu Binacional between
1993 and 1995. Mr. Gomide was also a professor at the Federal University of Paraná (Universidade Federal do Paraná) from 1970 to 1995
and the President and Chief Financial Officer of the Energy Company of Paraná (Companhia Paranaense de Energia – Copel) between 1986
and 1993 and from 1983 to 1985, respectively. He was also a hydraulic engineer at the Energy Company of Paraná between 1969 and 1982.

Lucas Navarro Prado. Mr. Prado has been an independent member of our board of directors and a member of our Audit Committee since
August 2017. He holds a law degree from the University of São Paulo (Universidade de São Paulo - USP) and a master’s degree in Corporate
Finance and Investment Banking from the University of São Paulo’s Business Institute Foundation (FIA-USP).  From 2005 to 2007, he served
as the advisor to the public-private partnership division of the Planning, Budget and Management Ministry of Brazil.  Mr. Prado served as an
advisor to SABESP’s CEO between 2007 and 2009 and as the head of SABESP’s legal department between 2009 and 2011.

Ernesto Rubens Gelbcke. Mr. Gelbcke has been an independent member of our board of directors since April 2018. Mr. Gelbcke has a
Bachelor’s degree and a Master’s degree in accounting sciences, both from the School of Economics, Administration and Accounting of the
University of São Paulo (Faculdade de Economia, Administração e Contabilidade da Universidade de São Paulo – FEA USP). He worked at
Arthur Andersen (various positions, including São Paulo audit coordinator and member of the Brazil technical policies committee) from 1965
to 1976, Directa Auditores (founder and CEO) from 1977 to 2014, Grant Thornton Brasil (chairman of the board of directors) from 2014 to
2015, Gelbcke Consultores (founder and consultant) since 2001, and GHG Contadores (founder) since 2017. He was one of the twelve elected
members of the Accounting Pronouncements Committee, representing the Foundation Institute of Accounting, Actuary and Financial Research
(Fundação Instituto de Pesquisas Contábeis, Atuariais e Financeiras – FIPECAFI) from its creation in 2006 until 2016. He was also a professor
at FEA USP from 1971 to 2003, professor and coordinator of the audit specialization course at the Central Bank with the Foundation Institute
for Accounting, Actuarial and Financial Research (Fundação Instituto de Pesquisas Contábeis, Atuariais e Financeiras – FIPECAFI) from 1978
to 1980, among others. He has authored and co-authored various articles, technical opinions and books, such as “Accounting Manual for Stock
Companies” (Manual de Contabilidade das Sociedades por Ações), “Manual for Corporate Accounting” (Manual de Contabilidade Societária),
and  “Intermediate  Accounting”  (Contabilidade  Intermediária).  He  was  a  member  of  the  fiscal  committee  and  of  the  audit  committee  of
AMBEV  S.A.  from  2007  to  2009,  a  member  of  the  Board  of  Directors  of  the  Brazilian  Institute  of  Independent  Accountants  (Instituto  dos
Auditores  Independentes  do  Brasil  –  IBRACON)  from  2015  to  2017,  and  a  member  of  the  audit  committee  of  AES  Eletropaulo  in  2017,
among others. Since 2017, he has been a member of the fiscal council of FIPECAFI. This term expires in 2019.

Rogério Ceron de Oliveira. Mr. Oliveira has been a member of our board of directors since May 2018. Mr. Oliveira holds a Bachelor’s
degree and a Master’s degree in economics from the State University of Campinas (Universidade Estadual de Campinas – UNICAMP) from
2005 to 2012, and is completing a doctorate in public administration at the Getúlio Vargas Foundation (Fundação Getúlio Vargas – FGV), with
experience in public finance. Since 2017, he is the Deputy Secretary of the Treasury of the State of São Paulo. He served in the São Paulo
Municipal  Government  as  Finance  Secretary  between  2015  and  2016,  Deputy  Secretary  of  Finance  in  2015,  Deputy  Secretary  of  Treasury
from  2001  to  2014  and  Chief  and  Advisor  of  Economics  for  the  Finance  Department  between  2007  and  2010.  He  also  worked  at  the
Accounting Court of the State of São Paulo in 2006 and worked as a researcher at CPqD Telecom & IT Solutions between 2001 and 2005. He
was  and  is  a  member  of  the  boards  of  directors  and  of  the  fiscal  committees  of  companies  such  as  the  São  Paulo  Company  for  the
Development  and  Mobilization  of  Assets  (Cia.  São  Paulo  de  Desenvolvimento  e  Mobilização  de  Ativos  –  SPDA),  SP  Negócios  and  the
Paulista Company of Securitization (Companhia Paulistana de Securitização – SPSEC). He was also a member of the fiscal council of the São
Paulo Metro Company (Companhia Metropolitano de São Paulo – Metro).

Board of Executive Officers

Our board of executive officers is composed of six executive officers appointed by our board of directors for a two year term.  Such terms
may be renewed three consecutive times. Our executive officers are responsible for all matters concerning our day‑to‑day management and
operations.  Members of our board of executive officers have individual responsibilities established by our board of directors and our bylaws.

The following are the names, ages, positions, dates of election and brief biographical descriptions of our board of executive officers:

Executive Officer

Karla Bertocco Trindade
Manuelito Pereira Magalhães Junior
Rui de Britto Álvares Affonso
Paulo Massato Yoshimoto
Luiz Paulo de Almeida Neto
Edison Airoldi

Age
41
50
60
65
62
61

Position

Chief Executive Officer
Corporate Management Officer
Chief Financial Officer and Investor Relations Officer
Metropolitan Region Officer
Regional Systems Officer
Technology, Enterprises and Environment Officer

Date Elected
May 14, 2018
June 22, 2017
June 22, 2017
June 22, 2017
June 22, 2017
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Karla Bertocco Trindade.  See above, “—Board of Directors”.

Manuelito  Pereira  Magalhães  Júnior.    Mr.  Magalhães  has  been  our  Corporate  Management  Officer  since  February  2011.    He  holds  a
degree in Economic Sciences from the State University of Campinas (Universidade Estadual de Campinas – UNICAMP).  Mr. Magalhães was
a member of our board of directors from January 2007 to February 2011. From 2009 to 2011 he was the Chief Executive Officer of Empresa
Paulista de Planejamento Metropolitano – EMPLASA.  From 2006 to 2009 he was the Secretary of Planning of the Municipality of São Paulo
and from 2005 to 2006 he was the Deputy Secretary of the Planning Secretariat.  From 2003 and 2004 he was Ombudsman of the National
Supplementary Health Agency.  From 1998 to 2002, he was the special advisor of the Ministry of Health. He was also a parliamentary advisor
in the Federal Senate from 1997 to 1998.

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Rui  de  Britto  Álvares  Affonso.    Mr.  Affonso  has  been  our  Chief  Financial  Officer  and  Investor  Relations  Officer  since  July  2003. 
Mr. Affonso holds a PhD and a Master’s degree in Economics from the State University of Campinas (Universidade Estadual de Campinas –
UNICAMP), and a degree in Economics from the University of São Paulo (Universidade de São Paulo - USP).  He has been a professor at
UNICAMP since 1986, a professor at the Business, Economics and Accounting School of USP from 1983 to 1989, and a Director of Public
Economy  at  the  Foundation  of  Administrative  Development  (Fundação  do  Desenvolvimento  Administrativo)  from  1994  to  2003.    He  also
represented Brazil on the board of directors of the Forum of Federations, a non‑governmental entity located in Canada, from 2000 to 2006. 
Mr. Affonso has also held several positions in state government.

Paulo Massato Yoshimoto.  Mr. Yoshimoto has been our Metropolitan Region Officer since February 2004.  He holds a degree in Civil
Engineering  from  the  Lins  School  of  Engineering  (Escola  de  Engenharia  de  Lins).    Mr.  Yoshimoto  joined  us  in  1983,  and  has  held  the
positions  of  executive  assistant  to  the  operations  office  and  head  of  the  water  production  and  maintenance  and  metropolitan  planning
departments.  Mr. Yoshimoto has also held the position of senior planning professional at Empresa Metropolitana de Planejamento from 1975
to 1983.

Luiz Paulo de Almeida Neto.  Mr. Almeida Neto has been our Regional Systems officer since January 2011.  He holds a degree in Civil
Engineering  from  the  Polytechnic  School  at  the  University  of  São  Paulo  (Universidade  de  São  Paulo  -  USP),  a  degree  in  Business
Administration  from  the  Votuporanga  Educational  Foundation  (Fundação  Educacional  Votuporanga/SP)  and  a  post‑graduate  degree  in
Sanitary Engineering from the School of Public Health at USP.  Mr. Almeida joined us in 1979 and has worked with us as head of the Baixo
Tietê Business Unit responsible for the management of areas located in the hydrographic basins of Baixo Tietê, Tietê‑Batalha, São José dos
Dourados and Turvo Grande.  Mr. Almeida Neto has authored several articles.

Edison  Airoldi.    Mr  Airoldi  has  been  our  Technology,  Enterprises  and  Environment  Officer  since  June  2015.    He  holds  a  degree  in
Mechanical Engineering from the Polytechnic School at the University of São Paulo (Universidade de São Paulo - USP) and a Master’s degree
in Business Administration from the Foundation Institute of Administration (Fundação Instituto de Administração - FIA).  Mr. Airoldi joined
us in 1981 and has worked with us as the Head of the Northern Region business unit, the Water Production business unit and the Technical and
Integrated Planning Unit.

B.      Compensation

Pursuant to Brazilian Corporate Law, our shareholders are responsible for establishing the aggregate amount of compensation we pay to
the members of our board of directors, members of our fiscal committee and our executive officers.  According to Instruction No. 480 issued
by CVM, we have to periodically disclose certain information on the aggregate compensation such as averages and fringe benefits.

In 2017, 2016 and 2015, the aggregate compensation, including benefits in kind granted that we paid to members of our board of directors,
board  of  executive  officers  and  fiscal  committee  for  services  in  all  capacities  were  R$4.4    million,  R$4.4  million    and  R$4.6  million,
respectively. At our annual shareholders’ meeting held on April 27, 2018, our shareholders approved R$4.7 million in aggregate compensation
payable to members of our board of directors, members of our fiscal committee and our executive officers in 2018.

The tables below sets forth the breakdown of the total compensation received by our directors and members of our board of executive

officers and fiscal committee and other data related to their compensation for the periods indicated:

2017

Year ended December 31,
2016
(in thousands of R$, except where indicated otherwise)

2015

Total compensation per administrative body
Board of directors
Board of executive officers
Fiscal committee
Total amount of compensation

Number of members (in individuals)
Board of directors
Board of executive officers
Fiscal committee

Fixed annual compensation

Salary
Board of directors
Board of executive officers
Fiscal committee

Direct and indirect benefits
Board of directors
Board of executive officers
Fiscal committee

Variable compensation

Bonus
Board of directors
Board of executive officers
Fiscal committee

Maximum amount of compensation
Board of directors
Board of executive officers
Fiscal committee

Minimum amount of compensation
Board of directors

848
3,208
313
4,369

7
6
5

659
1,856
247

189
796
66

-
556
-

156
691
62

96

923
3,184
299
4,406

8
6
5

710
1,877
243

213
812
56

-
494
-

157
618
61

96

1,139
3,135
324
4,598

10
6
5

878
1,781
252

262
833
72

-
521
-

157
581
66

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Board of executive officers
Fiscal committee

Average amount of compensation
Board of directors
Board of executive officers
Fiscal committee

439
62

121
535
62

420
51

114
531
61

494
64

114
489
60

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Profit Sharing and Pension Plans

We have established a pension and benefit fund (Fundação SABESP de Seguridade Social), or SABESPREV, to provide our employees
with retirement and pension benefits.  This pension plan provides benefit payments to former employees and their families.  Both we and our
employees make contributions to the pension plan under SABESPREV, which we called as plan G1.  Our total contributions to the pension
plan totaled R$48.7 million, R$24.3 million and R$23.7 million in 2017, 2016 and 2015, respectively.  In addition to the pension plan under
SABESPREV, we are also required to pay supplemental pension payments relating to the employment contract of certain employees prior to
the creation of SABESPREV, which we called as plan G0.  Based on independent actuarial reports, as of December 31, 2017, our obligation
under  these  both  plans  (G0  and  G1)  totaled  R$2,932.3 million.    For  further  information  on  our  pension  plans  see  Note  20  to  our  financial
statements included in this annual report.  

Beginning in 2008, payments under the profit‑sharing plan were based both on general goals that evaluate us as a whole and on other goals
that  evaluate  the  performance  our  different  business  units.    Payments  are  proportionally  reduced  annually  if  the  goals  are  not  completely
achieved.

We recorded profit‑sharing expenses of R$94.4 million, R$83.7 million and R$76.6 million in 2017, 2016 and 2015, respectively.  We do

not have a stock‑option plan for our employees.

C.      Board Practices

The members of our board of directors are elected at an annual shareholders’ meeting to serve a two‑year term. Such term may be renewed
three consecutive times.  Our next annual shareholders’ meeting will be held on April 27, 2018.  Our board of directors ordinarily meets once a
month or when called by a majority of the directors or the chairman.  See “Item 6.A. Directors and Senior Management—Board of Directors”.

Our board of executive officers is composed of six executive officers appointed by our board of directors for a two‑year term. Such term
may be renewed three consecutive times.  Although our bylaws provide that the meetings of our board of executive officers shall be held at
least twice a month, meetings are held on a weekly basis.  See “Item 6.A. Directors and Senior Management—Board of Executive Officers”.

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None  of  our  directors  and/or  executive  officers  is  a  party  to  an  employment  contract  providing  for  benefits  upon  termination  of
employment.    Those  directors  and  officers  who  are  also  our  employees  will  remain  as  our  employees  after  their  tenure  as  directors  and/or
officers, in this case, maintaining all benefits granted to our employees.

Fiscal Committee (Conselho Fiscal)

Our fiscal committee, which is established on a permanent basis, consists of a minimum of three and a maximum of five members and
generally meets once a month. Our fiscal committee currently consists of four members and four alternates.  Although each member must have
his or her respective alternate, we currently only have three alternates due to the resignation of one of the alternates immediately following
election.  All of the current members of our fiscal committee were elected in the shareholders’ meeting held on April 27, 2018.  Their tenure
will end on April 2019.  The primary responsibility of the fiscal committee, which is independent from management and from the external
auditors appointed by our board of directors, is to review our financial statements and report on them to our shareholders.

The following are the names, ages, position, date of election and brief biographical descriptions of the current and alternate members of

our fiscal committee:

Fiscal Committee Members

Humberto Macedo Puccinelli
Pablo Andres Fernandez Uhart
Rui Brasil Assis
Alexandre Pedercini Issa
Gustavo Carvalho Tapia Lira
César Aparecido Martins Louvison
Leticia Pedercini Issa Maia

Age
60
44
63
36
39
57
37

Position
Member
Member
Member
Member
Alternate
Alternate
Alternate

Date Elected
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018

Humberto Macedo Puccinelli.  Mr. Puccinelli has been a member of our fiscal committee since April 2011.  Mr. Puccinelli holds a degree
in  Economics  from  the  Pontificial  University  of  São  Paulo  (Pontifícia  Universidade  Católica  de  São  Paulo  -  PUC-SP).    He  worked  at  the
Economy and Planning Secretariat State of São Paulo (Secretaria de Planejamento e Gestão do Estado de São Paulo) from 1985 to 1995, at
the  Health  State  Department  as  Assistant  Secretary  from  1995  to  1996,  at  the  State  Treasury  from  1996  to  2002,  and  at  the  Economy  and
Planning  Secretariat  State  of  São  Paulo  as  Assistant  Secretary  in  2003.    He  has  been  the  Technical  Assistant  of  the  State  Treasury  since
January 2004.  

Pablo Andres Fernandez Uhart. Mr. Uhart has been a member of our fiscal committee since April 2017. He holds a Bachelor’s degree in
Public Administration from the Getulio Vargas Foundation (Fundação Getúlio Vargas – FGV - SP) and an MBA from the Pontifical Catholic
University of Rio de Janeiro (Pontifícia Universidade Católica do Rio de Janeiro – PUC - RJ). He also was an advisor to the São Paulo State
Secretary (Secretaria da Fazenda do Estado de São Paulo – FESP) and has more than twenty years of experience in finance, having held the
positions of Corporate Controller, Regional Head (Latin America) of Treasury Center and Corporate Finance, and Advisor & Risk Manager at
Nestlé from 1995 to 2013.

Rui Brasil Assis.  Mr. Assis has been a member of our fiscal committee since April 2014.  He holds a degree in Civil Engineering from
Escola de Engenharia de Lins.  In the public sector, he worked for Lins City Hall from 1980 to 1983, the Water and Electricity Department
from  1983  to  1999,  the  Water  Resources,  Sanitation  and  Construction  Secretariat  from  1999  to  2003,  the  Energy,  Water  Resources  and
Sanitation Secretariat from 2003 to 2007, the Energy Secretariat from 2007 to 2010 and the Sanitation and Water Resources Secretariat since
2011.  Mr. Assis has been a member of the fiscal committee of the Foundation Hydraulic Technology Center (Fundação Centro Tecnológico de
Hidráulica)  since  2014.  He  has  also  served  as  a  member  of  the  deliberative  council  of  the  Foundation  Agency  of  Alto  Tietê  Water  Basis
(Fundação Agência de Bacia Hidrográfica do Alto Tietê) from 2006 to 2014 and since 2017. Mr. Assis was a member of the fiscal committee
of EMAE from 2007 to 2011, the board of directors of the Association for Water Management of the Paraíba do Sul River Basin (AGEVAP)
from 2003 to 2006 and the board of directors of the Companhia Ambiental do Estado de São Paulo -CETESB from 1999 to 2007.

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Alexandre Pedercini Issa. Mr. Padercini has been a member of our fiscal committee since April 2017. He holds a Bachelor’s degree in
Administration  from  Milton  Campos  College  (Faculdade  Milton  Campos)  and  an  MBA  in  Strategic  Business  Management  from  the
Foundation for Education and Culture of Minas Gerais (Fundação Mineira de Educação e Cultura – FUMEC). He was a member of the Board
of Directors of the Sanitation Company of Minas Gerais State (Companhia de Saneamento de Minas Gerais – COPASA) from 2011 to 2016, a
member of the fiscal committee of the Telecommunications  provider that is part of the Minas Gerais Energy Company Group (Companhia
Energética de Minas Gerais – CEMIG) between 2013 and 2015. Additionally, he is also the founder and administrator of the investment club
Letalex.

Gustavo Carvalho Tapia Lira. Mr. Tapia has been a member of our fiscal committee since April 2018. He holds a Bachelor’s degree in
Administration  and  a  Master’s  degree  in  Political  Economics,  both  from  the  Pontificial  University  of  São  Paulo  (Pontifícia  Universidade
Católica de São Paulo – PUC-SP). Since 2013, he has been the expert advisor of the Management and Planning Secretariat’s Office (Gabinete
da Secretaria de Planejamento e Gestão), where he also served as an economic advisor public executive from 2009 to 2013. He also worked as
an examiner for the Fundação Procon-SP, from 2005 to 2008. He was a member of the fiscal committee of the Paulista Company of Events and
Tourism  (Companhia  Paulista  de  Eventos  e  Turismo  –  CPETUR)  and  is  currently  a  member  of  the  fiscal  committee  of  the  São  Paulo
Retirement Plan (São Paulo Previdência – SPPREV).

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César Aparecido Martins Louvison. Mr. Louvison has been a member of our fiscal committee since April 2017. He holds a Bachelor’s
degree  in  Law  from  the  University  of  Marilia  (Universidade de Marília)  and  was  a  professor  in  several  universities  and  secondary  schools
(1981-2006). He is currently the Technical Director III of Hydrological Resources Department and was previously a Public Executive at the
Secretariat for Sanitation and Water Resources (Secretaria de Saneamento e Recursos Hídricos do Estado de São Paulo)  between  2013  and
2017.  He  has  also  been  an  administrative  director  of  the  Barueri  Campus  of  the  Pontificial  Catholic  University  of  São  Paulo  (Pontifícia
Universidade Católica de São Paulo – PUC - SP) between 2010 and 2011, an Administrative Officer of the Office for the Development of
Sanitary Education and Mass Immunization (Fomento de Educação Sanitária e Imunização em Massa – FESIMA) between  2000  and  2007,
Planning and Control Technical Assistant II of the Justice and Citizenship Defense Secretariat’s Office of the State of São Paulo (Secretaria de
Estado da Justiça e Defesa da Cidadania de São Paulo) between 1998 and 1999, and director of the Brazilian detention center for the youth
(Fundação do Bem-Estar do Menor – FEBEM-SP) from 1996 to 1998.

Leticia Pedercini Issa Maia. Ms. Pedercini has been a member of our fiscal committee since April 2017. She holds a Bachelor’s degree in
Administration from the Administrative School of Minas Gerais (FEAD Minas - Centro de Gestão Empreendedora). She is the founder and
manager of Hydrocenter Válvulas Tubos e Conexões Ltda since 2004 and the Chief Financial Officer of GPI Distribuidora since 2012. She has
also been the Vice-President of the Fiscal Council of the Sanitation Company of Minas Gerais State (Companhia  de  Saneamento  de  Minas
Gerais – COPASA) from 2015 to 2016, the President of the Fiscal Council of the Sanitation Company of Minas Gerais State (Companhia de
Saneamento  de  Minas  Gerais – COPASA)  from  2014  to  2015  and  a  member  of  the  Fiscal  Committee  of  the  Sanitation  Company  of  Minas
Gerais State (Companhia de Saneamento de Minas Gerais – COPASA) from 2011 to 2014. Prior to that, she was a portfolio manager at Clube
de Investimentos Letalex from 2007 to 2008 and the CFO of Grupo Dismetal from 1999 to 2004.  

Audit Committee

Our bylaws provide for an audit committee to be comprised of three board members, who will cumulatively comply with the requirements
of  (i)  independence,  (ii)  technical  expertise,  and  (iii)  identifying  and  complying  with  applicable  exemptions  in  accordance  with  the  United
States Securities and Exchange Commission, or the SEC, and New York Stock Exchange, or NYSE, rules.  Our Board of Directors determined
that Jerônimo Antunes qualifies as a financial expert under the SEC rules.  The members are appointed by the board of directors and pursuant
to  our  bylaws,  the  members  of  our  audit  committee  may  be  appointed  simultaneously  to  their  election  to  the  board  of  directors  or  by  a
subsequent resolution.

The  audit  committee  is  mainly  responsible  for  assisting  and  advising  the  board  of  directors  in  its  responsibilities  to  ensure  the  quality,
transparency  and  integrity  of  our  published  financial  information  and  financial  statements.    The  audit  committee  is  also  responsible  for
supervising all matters relating to the Code of Ethics and Conduct, accounting, internal controls, the internal and independent audit functions,
compliance, risk management and internal policies, such as the related parties transaction policy.  The audit committee and its members have
no decision making powers or executive functions.

The minimum availability required from each member of the audit committee is thirty hours per month.  Under our bylaws, the members shall
exercise their roles for the same period as their corresponding term of office, or until otherwise resolved by the general shareholders’ meeting
or by resolution of the board of directors.  In the event that an audit committee member resigns or is removed from office after exercising any
portion of his or her term, such member may only rejoin the audit committee at least three years from the end of such member’s term. All of
our audit committee members are independent.

The following are the names, positions and dates of election of the members of our audit committee: 

Director

Jerônimo Antunes
Lucas Navarro Prado
Luís Eduardo Alves de Assis

Regulatory Affairs Committee

Position

Coordinator and Financial Expert
Member
Member

Date Elected
May 12, 2016
August 24, 2017
September 30, 2016

In April 2011, we created a regulatory affairs committee, which was comprised of our Chief Executive Officer, Chief Financial Officer
and  Investor  Relations  Officer,  Metropolitan  Officer,  and  Regional  System  Officer.    The  regulatory  affairs  committee  was  responsible  for
defining  our  regulatory  directives,  strategies  and  guidelines  and  coordinating  our  regulatory  affairs  department,  under  the  directives  of  our
executive board.

In our annual shareholders’ meeting, held on April 27, 2018, our bylaws were amended and this committee was terminated. Regulatory

affairs matters are currently handled by our executive officers.

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Eligibility and Advisory Committee

In accordance with Federal Law No. 13,303/16, and pursuant to our bylaws, as approved at the extraordinary shareholders’ meeting held
on  April  27,  2018,  we  will  create  an  Eligibility  and  Advisory  Committee,  responsible  for  supervising  the  process  for  the  appointment  and
evaluation of members of our board of directors, executive board and fiscal council.

This committee will be composed of up to three members, elected by a general shareholders’ meeting. Members must have at least three

years' professional experience in public administration, or three years’ experience in the private sector in an area in which, or related to which,
we operate.

Members of the Eligibility and Advisory Committee may attend board of directors’ meetings where matters related to this committee are

discussed and will have the right to speak, but not to vote, in accordance with our bylaws.

This committee will be also responsible for providing methodological and procedural support to the board of directors to evaluate the

performance of officers and other members of statutory committees.

We expect that a written charter addressing the committee’s purpose and detailing its required responsibilities will be approved by the

board of directors.

D.      Employees

As  of  December  31,  2017,  we  had  13,672  full‑time  employees.    On  December  31,  2017,  we  had  910  interns  and  540  apprentices

(aprendizes), as defined by Federal Law No. 10,097/2000, dated December 19, 2000, as amended.

The following table sets forth the number of our full‑time employees by main category of activity and geographic location as of the dates

indicated:

Number of employees by category of activity:
Projects and operations
Administration
Finance
Marketing

Number of employees by corporate division:
Head office
São Paulo metropolitan region
Regional Systems
Total number of employees 

2017

As of December 31,
2016

2015

9,176
2,147
387
1,962

1,342
6,353
5,977
13,672

9,456
2,220
424
2,037

1,389
6,634
6,114
14,137

9,489
2,211
440
2,083

1,377
6,612
6,234
14,223

The average tenure of our employees is approximately 19.5 years.  We also outsource certain services such as maintenance, delivery of

water and sewage bills, meter reading, catering and security.  We believe that our relations with our employees are generally satisfactory.

Approximately 70% of all our employees are members of unions.  The five main unions that represent our employees are (i) the Union of
Workers in Water, Sewage and Environment of the State of São Paulo – SINTAEMA; (ii) workers union of Santos Urban Industries, Baixada
Santista region, South Coast and Vale Ribeira – SINTIUS; (iii) the Union of Engineers of the State of São Paulo – SEESP; (iv) the Union of
Attorneys of the State of São Paulo – SASP; and (v) the Union of Industrial Technicians of the State of São Paulo – SINTEC. 

The  collective  bargaining  agreement  signed  in  2014  resulted  in:    (i)  a  salary  increase  of  5.2%  (which  corresponds  to  the  inflation
adjustment  for  the  period);  (ii)  the  establishment  of  an  employment  guarantee  for  98%  of  our  employees;  (iii)  an  increase  of  8%  in  meal
vouchers; (iv) an increase of 5.2% in food allowance; and (v) the termination of Regional Salary for which Sabesp adopted separate pay scales
for Region 1 – São Paulo metropolitan region, Vale do Paraíba, Baixada Santista, Capivari/Jundiaí and Litoral Norte – and Region 2 – other
interior and coast cities.  Region 2 employees received salaries at a ratio of 80% of the salaries of Region 1 employees.  As a result of the
collective agreement of 2014, equalization in salaries was conceded for the two regions in two stages:  first, on May 1, 2014 with a salary
increase from 80% to 90% and second, on May 1, 2015, from 90% to 100%.

The  collective  bargaining  agreement  signed  in  2015  resulted  in:    (i)  a  salary  increase  of  8.29%  (which  corresponds  to  the  inflation
adjustment for the period plus a 1.01% real adjustment); (ii) the readjustment of 10% in the values of the meal vouchers and monthly food
stipend; (iii) a readjustment of 8.29% for the remaining benefits; (iv) maintenance of the clause that guarantees the employment of 98% of our
employees according to the 2014/2015 collective bargaining agreement; and (iv) maintenance, in an exceptional character, of the Christmas
food stipend.

The  collective  bargaining  agreement  signed  in  2016  resulted  in:    (i)  a  salary  increase  of  10.03%  (which  corresponds  to  the  inflation
adjustment for the period); (ii) a 10.03% increase in meal vouchers, food stipends and nursery stipends; (iii) maintenance of the clause from
the  2014/2015  collective  bargaining  agreement  which  guarantees  the  employment  of  98%  of  our  employees;  (iv)  and  maintenance  of  the
Christmas food stipend.

The  collective  bargaining  agreement  signed  in  2017  resulted  in:  (i)  a  salary  increase  of  3.7%  (which  corresponds  to  the  inflation
adjustment for the period); (ii) a 7.1% increase in meal vouchers; (iii) a 36.1% increase in food assistance; (iv) a 8.39% increase in nursery
stipends; (v) maintenance of the clause from the 2016/2017 collective bargaining agreement which guarantees the employment of 98% of our
employees; and (vi) maintenance of the Christmas food stipend on an exceptional basis.

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We experienced a two day strike in 2013, which did not interrupt the essential services that we provide.  In 2017, 2016, 2015 and 2014
there were no strikes. Under Brazilian law, our non‑administrative employees are considered “essential employees” and, therefore, are limited
in their right to strike.

E.      Share Ownership

As of May 24, 2018, none of our directors and executive officers owned any of our common shares. See “Item 7.A. Major Shareholder”

for more information. 

ITEM 7.            MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS

A.      Major Shareholder

On April 22, 2013 our shareholders approved a stock split, following which each common share represented three new common shares. 
Since then, our outstanding capital stock consists of 683,509,869 common shares, without par value.  Under state laws, the State is required to
own at least one‑half plus one of our outstanding common shares.  All of our shareholders, including the State, have the same voting rights.

The following table sets forth ownership information for each of our shareholders that beneficially owned 5.0% or more of our common

shares and for our officers and directors, individually and as a group, as of April 2, 2018: 

State of São Paulo
Directors and executive officers of Sabesp
Lazard Asset Management
Others

(1)

Total

Common shares

Shares

%

343,528,563
-
34,596,179
305,385,127

683,509,869

50.3%
-
5.1%
44.6%

100.0%

(1)     As of May 24, 2018, 49.7% of our outstanding common shares were held by 5,962 registered shareholders in Brazil.

As of April 2, 2018, 19.4% of our outstanding common shares were held in the United States, in the form of ADSs.  According to the
ADS depositary’s records, which contain information regarding the ownership of our ADSs, there were, on March 31, 2018, 31 record holders
of ADSs in the United States.

On May 12, 2017, we announced that the State of São Paulo’s Privatization Program Board, established by State Law No. 9,361/1996,

dated as of July 5, 1996, resolved to take the following measures:

                 (i).            to proceed with studies aiming to provide alternatives to our current capitalization model;

               (ii).            the hiring of the International Finance Corporation, a member institution of the World Bank Group; and

              (iii).            the conclusion of an agreement between us and the São Paulo State Government, through the Secretariat of Sanitation and
Water Resources and the Secretariat of Finance, to delineate the scope of the International Finance Corporation’s hiring and to
govern the relationship between the contracting parties, including the proportional reimbursement of expenses.

The proposed capitalization plan provides for the creation of a new parent company to which the State of São Paulo would transfer all of
its ownership interest in us, thus maintaining direct control over our operations through this new parent company. In the process, institutional
investors may be invited to participate in the new company’s capital, but the State of São Paulo will in any case retain sufficient shareholding
interest to exercise corporate control, as required by law

In September 2017, the State of São Paulo obtained approval for State Law No. 16,525/2017, which authorizes the State of São Paulo to
set up a controlling company to hold all of the shares that the State of São Paulo holds in our company. Once formed, this controlling company
will  control  our  company,  pursuant  to  the  provisions  of  Art.  116  of  the  Brazilian  Corporate  Law.  State  Law  No.  16,525/2017  allows  other
minority shareholders, including private companies and state companies, to hold shares of the controlling company, provided that the State of
São Paulo holds the majority of the common shares of the controlling company. On March 9, 2018, the State of São Paulo received a letter
from  a  group  of  investors  expressing  interest  in  acquiring  shares  of  the  controlling  company.  This  letter  is  being  assessed  by  the  State
Privatization Program’s Board (Conselho Diretor do Programa Estadual de Desestatização - CDPED), which has authority over our corporate
reorganization,  including  the  formation  of  the  controlling  company.  The  transaction  proposed  in  the  letter  relates  only  to  shares  of  the
controlling company level and therefore would not affect the corporate control of our company, which will remain held by the State of São
Paulo.  The  identity  of  the  investors  and  the  content  of  the  letter  remain  confidential  in  accordance  with  the  rules  applicable  to  the
administrative procedure established by CDPED for the purposes of operation.

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B.      Related Party Transactions

Transactions with the State of São Paulo

We have entered into extensive transactions with the State, which is our controlling shareholder, and we expect to continue to do so.  The
State is our largest customer.  It owns some of the facilities that we use in our business, it is one of the governmental entities that regulate our
business, and it has assisted us in obtaining financing on favorable terms.

Many of our transactions with the State reflect policies of the State that depend on decisions of elected officials or public servants, and are
accordingly subject to change.  Among the practices that could change are those described below concerning the provision of State guarantees,
and the terms on which we use State‑owned reservoirs.

Rendering Services

We  provide  water  and  sewage  services  to  the  federal  government,  state  and  municipal  governments  and  government  entities  in  the
ordinary  course  of  our  business.    Gross  revenue  from  sales  to  the  State,  including  State  entities,  totaled  R$463.0 million  in  2017,  R$445.7
million in 2016 and  R$357.5  million  in  2015.    Our  accounts  receivable  from  the  State  for  sanitation  services  totaled  R$106.0  million  and
R$77.4 million, as of December 31, 2017 and 2016, respectively.  In addition, as required by law, we invest our cash and cash equivalents with
government financial institutions.

Payment of Pensions

Pursuant to a law enacted by the State, certain former employees of some State owned companies that provided services to us in the past
and later merged to form our Company acquired a legal right to receive supplemental pension benefit payments.  These rights are referred to as
“Plan G0”.  These amounts are paid by us, on behalf of the State, and are claimed by us as reimbursements from the State, as primary obligor. 
In 2017, 2016 and 2015, we made payments to former employees of R$179.5 million, R$178.7 million and R$158.9 million, respectively, in
respect of Plan G0.  The State made reimbursements in 2017, 2016 and 2015 in the amounts of R$192.9 million, R$139.5 million and R$121.7
million, respectively.

Agreements with the State

In September 1997, we and the State entered into a memorandum of understanding providing that we would, in effect, apply dividends we
declared that were otherwise payable to the State to offset accounts receivable in connection with the provision of water and sewage services to
the State and its controlled entities.

On December 11, 2001, we entered into an agreement with the State and the DAEE.  Pursuant to this agreement, the State acknowledged

and agreed, subject to an audit by a State‑appointed auditor, to pay us amounts it owed to us in respect of:

·                  water  and  sewage  services  we  provided  to  governmental  agencies,  State‑owned  autonomous  entities  and  foundations  through
December 1, 2001, and that was not offset in accordance with the September 1997 memorandum of understanding, in the total amount
of R$358.2 million.  This amount was renegotiated and included in the second amendment to this agreement discussed below; and

·                  supplemental  retirement  and  pension  benefits  we  paid  from  March  1986  to  November  2001  on  behalf  of  the  State  to  former
employees  of  the  State‑owned  companies  which  merged  to  form  our  Company;  as  we  did  not  reach  an  agreement  regarding  these
amounts,  a  joint  inquiry  has  commenced  in  order  to  ensure  agreement  between  us  and  the  State,  in  the  total  amount  of
R$320.6 million.  This amount was renegotiated and included in the third amendment to this agreement discussed below. 

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The agreement provided that the DAEE would transfer to us ownership of the Taiaçupeba, Jundiaí, Biritiba, Paraitinga and Ponte Nova
reservoirs (herein after referred to as “the reservoirs”), which form the Alto Tietê system, and that the fair value of these assets would reduce
the amounts owed to us by the State.

Under the December 2001 agreement, in 2002, a State‑owned construction company (Companhia Paulista de Obras e Serviços),  or  the
CPOS, on behalf of the State, and an independent appraisal firm (Engenharia de Avaliações), or the ENGEVAL, on our behalf, presented their
valuation reports relating to the reservoirs.  Under the agreement, the arithmetic average of these appraisals is deemed the fair value of the
reservoirs.  The appraisals contained in these reports were in the amounts of R$335.8 million and R$341.2 million, respectively.  Because we
had  already  made  investments  in  these  reservoirs  by  then,  the  arithmetic  average  of  the  appraisals  submitted  to  our  board  of  directors  by
August 2002, R$300.9 million, was net of a percentage corresponding to these investments.  Our board of directors approved the valuation
reports.  This amount was updated until September 2008 according to IPCA index and amounted to R$696.3 million.

Under the December 2001 agreement, for amounts due in excess of the fair value of the reservoirs, the State is to make payments in 114
consecutive monthly installments.  The nominal amount owed by the State would not be indexed to inflation or earn interest if there was a
delay in concluding the appraisal of fair value.  The installments will be indexed on a monthly basis by the IGP‑M index, plus 6.0% per year,
starting on the date the first installment becomes due.

On October 29, 2003, the Public Prosecution Office of the State of São Paulo (Ministério Público do Estado de São Paulo), on behalf of
the people of the State, brought a civil public action in a Trial Court of the State of São Paulo (12 Vara da Fazenda Pública do Estado de São
Paulo) alleging that a transfer to us of ownership of the Alto Tietê system reservoirs from the DAEE would be illegal.  An injunction against
the transfer of ownership of such reservoirs was granted but was later reversed.  However, in October 2004, the court of first instance handed
down  its  judgment  on  the  civil  public  action  and  declared  the  agreement  between  us,  DAEE  and  State  of  São  Paulo  null  and  void.    This
decision was suspended by us, and the State treasury and DAEE appealed the decision.  On August 23, 2010, the appeal was denied.  We have
petitioned for clarification of the appeal court’s decision and will seek to take the case to the Supreme Court.  The effects of the appeal court’s
decision will be suspended until the end of the legal process.  We have assessed that it is not probable that we will ultimately prevail in our
appeal, which would prohibit the transfer of the reservoirs in payment of the accounts receivable due from the State.

The  December  2001  agreement  also  provided  that  the  legal  advisors  of  the  State  would  carry  out  specific  analyses,  which  have
commenced, to ensure agreement among the parties as to the methodology employed in determining the amount of reimbursement for pension
benefits  owed  to  us  by  the  State.    The  commencement  of  payments  with  respect  to  pension  amounts  owed  to  us  by  the  State  has  been
postponed  until  these  analyses  are  completed,  the  appraisal  report  is  approved  and  the  credit  assignments  relating  to  the  transfer  of  the
reservoirs are formalized.  As discussed above, the transfer of these reservoirs is currently being disputed and we are not certain whether the
transfer will be legally permitted.  Under the December 2001 agreement, the first payment was to be made in July 2002.

On March 22, 2004, we and the State entered into a first amendment to the December 2001 agreement.  Under this amendment, the State
acknowledged  that  it  owed  R$581.8  million  to  us  relating  to  unpaid  accounts  receivable  from  the  State  until  February  29,  2004,  and  we
acknowledged that we owed an aggregate amount of R$518.7 million to the State as dividends, in the form of interest on shareholders’ equity. 
Accordingly,  we  and  the  State  agreed  to  offset  each  other’s  credit  up  to  the  limit  of  R$404.9  million,  which  was  an  amount  adjusted  up  to
February  2004.  The  outstanding  balance  of  R$176.9  million  (as  of  February  29,  2004)  of  the  State’s  consolidated  debt  would  be  paid  in
consecutive monthly installments from May 2005 until April 2009.  These installments would be indexed according to the IPCA index, plus an
interest rate of 0.5% per month.  Upon the execution of the first amendment, part of the debt that the State owed to us for the use of water and
sewage services through February 2004 was offset by the debt that we owed to the State as dividends, in the form of interest on shareholders’
equity.  The outstanding balance of R$113.8 million as dividends in the form of interest on shareholders’ equity that we owed to the State was
netted against accounts overdue after February 2004.  The first amendment did not amend the provisions of the December 2001 agreement
regarding  the  supplemental  retirement  and  pension  benefits  we  paid  from  March  1986  to  November  2001  on  behalf  of  the  State  to  former
employees of the State‑owned companies. 

On December 28, 2007, we and the State entered into a second amendment to the December 2001 agreement, pursuant to which the State
agreed  to  pay  (i)  the  outstanding  balance  under  the  first  amendment,  in  the  amount  of  R$133.7  million  (as  of  November  30,  2007),  in  60
consecutive  monthly  installments,  beginning  on  January  2,  2008,  and  (ii)  the  amount  of  R$236.1  million  relating  to  part  of  the  accounts
overdue and unpaid from March 2004 through October 2007 regarding the provision of water supply and sewage collection services.  As part
of this amendment, we agreed to pay during the period from January through March 2008 the outstanding balance of dividends in the amount
of R$400.8 million, in the form of interest on shareholders’ equity, due from March 2004 through December 2006.  We paid these amounts as
agreed.  Under the second amendment, dividends payable by us are no longer required to be applied to offset accounts receivable from the
State, and as a result, we are currently unable to determine the amount, if any, of the declared dividends that the State will apply to current and
future accounts receivable owed to us by the State or its entities.  In addition, pursuant to the second amendment, we and the State agreed on
complying with certain mutual obligations relating (i) to the improvement of payment processes and budget management procedures; (ii) the
rationalization  of  the  use  of  water  and  the  volume  of  water  and  sewage  bills  under  the  responsibility  of  the  State;  (iii)  the  recording  of
government entities with accounts overdue in a delinquency system or reference file; and (iv) the possibility of interrupting water supply to
these  entities  in  case  of  non‑payment  of  water  and  sewage  bills.    Finally,  this  second  amendment  did  not  amend  the  provisions  of  the
December 2001 agreement regarding the supplemental retirement and pension benefits we paid from March 1986 through November 2001 on
behalf of the State to former employees of the State‑owned companies that merged to form our Company.

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In 2007, we received payment installments from the State in the amount of R$326.0 million.  As of December 31, 2007, our dividends
payable to the State, due from 2004 through 2007, were in the amount of R$552.0 million.  We are currently unable to determine the amount, if
any, of the declared dividends that the State will apply to current and future accounts receivable owed to us by the State or its entities.  The
second amendment no longer requires that dividends be applied to offset accounts receivable from the State.

On  March  26,  2008,  we  entered  into  a  commitment  agreement  (termo  de  compromisso)  with  the  State  with  the  purpose  of  finding  an
alternate solution to the deadlock related to the amount owed by the State to us in connection with the supplemental retirement and pension
benefits we paid from March 1986 to November 2001 on behalf of the State to former employees of the State‑owned companies which merged
to form our Company.  In this agreement, we and State committed to hiring specialized companies to carry out new valuations of the amounts
owed to us by the State and of the reservoirs.  An independent consulting firm, FIPECAFI, has been retained to resolve the disagreement and
validate  the  amount  we  paid  from  March  1986  through  November  2001  on  behalf  of  the  State  to  former  employees  of  the  State‑owned
companies  that  merged  to  form  our  Company,  which  the  State  has  not  yet  agreed  to  reimburse  us  hereinafter  referred  to  as  the  “Disputed
Reimbursement  Amount”.    In  addition,  FIPECAFI  performed,  together  with  another  independent  consulting  firm,  a  new  evaluation  of  the
reservoirs that might be transferred to us as amortization of the reimbursement payable by the State to us.

On November 17, 2008, we, the State and DAEE entered into a third amendment to the December 2001 agreement, pursuant to which the
State recognized a debt balance payable to us totaling R$915.3 million, hereinafter referred to as the “Undisputed Reimbursement Amount,” as
adjusted  based  on  the  IPCA.    We  accepted  on  a  provisional  basis  the  reservoirs  as  part  of  the  payment  of  the  Undisputed  Reimbursement
Amount  and  offered  to  the  State  a  provisional  settlement,  recognizing  a  credit  totaling  R$696.3  million,  corresponding  to  the  value  of  the
reservoirs located in the Alto Tietê region.  We and the State have agreed that the final offset will only be recorded when the effective transfer
of  the  reservoirs  is  recorded  at  the  Real  Estate  Registry.    The  outstanding  balance  of  Undisputed  Reimbursement  Amount,  amounting  to
R$219.0 million, is being paid by the State in 114 consecutive monthly installments, as adjusted by the annual IPCA variation, plus interest
accruing at the annual rate of 6.0%.  The first installment was paid in November 2008.

On March 18, 2015, we, the State and DAEE, with the intervention of the Department of Sanitation and Water Resources, executed a term
of agreement, in the amount of R$1,012.3 million, of which R$696.3 million refers to the principal amount and R$316.0 million refers to the
monetary adjustment of the principal through February 2015.

The principal amount is payable in 180 installments, as follows:

·         The first 24 installments were settled by an immediate transfer of 2,221,000 preferred shares issued by the São Paulo Company of
Electric Power Transmission (Companhia de Transmissão de Energia Elétrica Paulista - CTEEP), totaling R$87.2 million, based on
the share closing price as of March 17, 2015. As of April 20, 2016, the Company sold these shares for R$111.1 million; and

·         The amount of R$609.1 million, payable in 156 monthly installments, was adjusted by IPCA until the initial payment date on April 5,

2017, after which installments are adjusted by IPCA plus simple interest of 0.5% per month.

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Given  that  the  lawsuit  regarding  the  transfer  of  the  reservoirs  is  pending  final  and  unappealable  court  decision,  the  agreement  also

provides for the following:

·         If transfer is possible and the reservoirs are effectively transferred to us and registered at the authority’s office, we will reimburse to
the State the amounts paid in replacement of the reservoirs (principal amount) in 60 monthly installments adjusted by IPCA until the
payment date of each installment; and

·                 If the transfer of the reservoirs is not possible, the State will pay us, in addition to the principal amount, the inflation adjustment
credit in the amount of R$316.0 million in 60 installments, following payment of the principal amount.  The amount will be adjusted
based on IPCA at the start date of payments and, as of that date, IPCA will be incurred plus 0.5% simple interest rate/month over the
amount of each installment.

In addition to the Undisputed Reimbursement Amount, there is an outstanding balance relating to the Disputed Reimbursement Amount. 
As  of  December  31,  2017,  the  Disputed  Reimbursement  Amount  amounted  to  R$1,021.7  million,  but  due  to  the  uncertainty  regarding  the
recovery of the amount our management decided not to recognize the reimbursements. See Note 10 to our financial statements included in this
annual  report  regarding  the  Disputed  Reimbursement  Amount.    We  and  the  State  have  agreed  that  the  dispute  relating  to  the  Disputed
Reimbursement Amount will not prevent us from carrying out the commitments made in the December 2001 agreement.

In addition, the third amendment to the December 2001 agreement provides for the regularization of the monthly flow of benefits.  While
we are liable for the monthly flow of benefits to the former employees of the  state‑owned companies that merged to form our Company, the
State shall reimburse us based on criteria identical to those applied when determining the Undisputed Reimbursement Amount.  Should there
be no preventive court decision, the State will assume the flow of monthly payment of benefits portion deemed as undisputed.

Finally, the third amendment to the December 2001 agreement established that the Public Attorney’s Office of the State of São Paulo, or
the  Public  Attorney’s  Office,  would  issue  a  revised  interpretation  of  the  calculation  and  eligibility  criteria  applicable  to  the  Disputed
Reimbursement Amount.  At that time, we believed that the Public Attorney’s Office would issue a revised interpretation which would have
helped  us  bring  the  negotiations  with  the  State  to  a  conclusion.    However,  contrary  to  our  expectations,  the  Public  Attorney’s  Office
interpretation of the calculation and eligibility criteria applicable to the Disputed Reimbursement Amount refuted the reimbursement of the
largest portion of this amount.  As of December 31, 2017, we had made a provision of R$2,543.9 million in our pension obligations accounts
in respect of the pension benefit obligation of Plan G0.

Even though the negotiations with the State are still progressing, we cannot assure you that we will recover the receivables related to the

Disputed Reimbursement Amount.

We  will  not  waive  the  receivables  from  the  State  to  which  we  consider  ourselves  to  be  legally  entitled.    Accordingly,  we  will  take  all
possible actions to resolve the issue at all administrative and court levels.  Should this conflict persist, we will take all the necessary actions to
protect  our  interests.    On  March  24,  2010,  we  sent  to  the  controlling  shareholder  the  official  letter  approved  by  our  executive  committee,
proposing  that  the  matter  be  discussed  at  the  B3  Arbitration  Chamber.    In  June  2010,  we  sent  a  settlement  proposal  to  the  Secretary  of
Treasury, which was denied, and on November 9, 2010, we filed a civil lawsuit against the State of São Paulo seeking full reimbursement of
the amounts paid as benefits granted by Law No. 4,819/1958.  Regardless of the civil lawsuit, we will continue to actively seek a settlement
with the State government.

Agreement with the State and the city of São Paulo

On  June  23,  2010  the  State  and  the  city  of  São  Paulo  executed  an  agreement  in  the  form  of  a  convênio,  to  which  we  and  ARSESP
consented, under which they agreed to manage the planning and investment for the basic sanitation system of the city of São Paulo on a joint
basis.  The principal terms of this convênio were as follows:

·         the State and the city of São Paulo would execute a separate agreement with us, granting us exclusive rights to provide water and

sewage services in the city of São Paulo;

·         ARSESP would regulate and oversee our activities regarding water and sewage services in the city of São Paulo, including tariffs;

·         a management committee (Comitê Gestor), consisting of six members appointed for two-year terms, with the State and the city of
São Paulo given the right to appoint three members each, would be responsible for planning water and sewage services for the city
and for reviewing our investment plans; and

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·         we may participate in management committee meetings but may not vote.

In  application  of  the  convênio,  we  executed  a  separate  contract  with  the  State  and  the  city  of  São  Paulo,  also  dated  June  23,  2010,  to

regulate the provision of these services for the following 30 years.  The principal terms of this contract are as follows:

·         The total investment stated in the contract must be equal to 13% of gross revenues from the provision of services to the city of São

Paulo, net of the taxes on revenues.

·                  We  must  transfer  7.5%  of  the  gross  revenues  obtained  from  providing  sanitation  services  in  the  municipality  of  São  Paulo  and
subtract (i) COFINS and PASEP taxes, and (ii) unpaid bills of publicly owned properties in the city of São Paulo, to the Municipal
Fund for Environmental Sanitation and Infrastructure (Fundo Municipal de Saneamento Ambiental e Infraestrutura), established by
Municipal Law No. 14,934/2009.  In April 2013, ARSESP postponed the application of such  municipal charges based on a request
from the São Paulo State Government to analyze, among other things, methods to reduce the impact on consumers.  In May 2014
ARSESP  maintained  the  suspension  of  Resolution  407/2013  until  the  results  are  obtained  in  the  revision  of  the  contract  signed
between us, the city and the State of São Paulo, thereby delaying the authorization to pass the charge through to consumers on the
service bill.

·                  Our  investment  plan  must  be  compatible  with  the  sanitation  plans  of  the  State,  the  city  of  São  Paulo  and,  if  necessary,  the

Metropolitan region.

·         ARSESP will ensure that the tariffs will adequately compensate us for the services we provide and that tariffs may be adjusted in

order to restore the original balance between each party’s obligations and economic gain (equilíbrio econômico financeiro).

We currently have an investment plan in place that reflects our obligations under the convênio and addresses their compatibility with the
sanitation plans of the State, the city of São Paulo and, if necessary, the São Paulo metropolitan region.  The investment plan is not irrevocable
and is reviewed every four years by our management committee.  We draft a detailed work plan every two years, particularly with respect to
the investments to be executed in the subsequent period.  In December 2016, we concluded the first four-year revision of our contract with the
city of São Paulo, which altered our service quality, investment and investment tracking targets.  However, the issue of the 7.5% charge was
not discussed.

In  January  2018,  the  second  step  of  our  Second  Ordinary  Tariff  Revision  was  initiated.  In  this  review,  the  possibility  of  including  the
average tariff in the portion related to transfers to municipal funds, as is the case with the 7.5% that we transfer to the São Paulo Municipal
Fund for Environmental Sanitation and Infrastructure, was discussed.

On May 9, 2018 ARSESP announced the final results of the Second Ordinary Tariff Revision, recognizing the regulatory limit of 4% of
each  municipality’s  direct  operating  revenue  in  the  tariff  calculation.  As  a  result,  1.84%  was  declared  the  tariff  for  the  Municipality  of  São
Paulo, corresponding to the 4% regulatory limit.

On May 24, 2018, as a result of the final result of the Second Ordinary Tariff Revision, we filed a reconsideration request as well as a
clarification and revision request with ARSESP. As part of the clarification and revision request, we requested that ARSESP provide a revision
of the calculation of the financial component related to municipal funds. For more information, see “Item 4.B. Business Overview—Tariffs—
Second Ordinary Tariff Revision (2017-2020).”

Dividends

We regularly pay dividends to our shareholders, including the State of São Paulo.  In the past, we have withheld part of the dividends to

which the State was entitled in order to offset it against our pending receivables from the State.

In accordance with our agreements with the State, we do not anticipate that we will withhold dividends to which the State was entitled in

order to offset it against our pending receivables from the State in the near future.

Government Guarantees of Financing

In some situations, the federal government, the State or government agencies guarantee our performance under debt‑ and project‑related

agreements.

Furthermore,  the  federal  government  has  guaranteed,  and  the  State  has  provided  a  counter‑guarantee,  in  respect  of  the  financial
agreements we entered into with the IADB (i) in 1992 and 2000 for the total original aggregate amount of US$600.0 million related to the
financing of the first and second phases of the Tietê River recovery project to reduce pollution; and (ii) in 2010 for the aggregate amount of
US$600 million related to the financing of the third phase of the Tiête River project.  The federal government has also guaranteed and the State
of  São  Paulo  has  provided  a  counter‑guarantee,  in  respect  of  the  financial  agreement  we  entered  with  the  IBRD  in  the  amount  of
US$100 million for the Water Source Program (Programa Mananciais).

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We also entered into credit agreements with JICA, which were guaranteed by the federal government, with counter‑guarantee from the
State of São Paulo, for the financing of (i) the Clean Wave Program for the Baixada Santista metropolitan region, on August 6, 2004, for an
aggregate principal amount of ¥21,320 million; (ii) the second phase of the Clean Wave Program, in February 2011, for an aggregate principal
amount of ¥19,169 million; (iii) the environmental improvement program in the basin of the Billings dam, in October 2010, for an aggregate
principal amount of ¥6,208 million; and (iv) the Corporate Program for Water Loss Reduction, in February 2012, for an aggregate principal
amount of ¥33,584 million.

For more information on the aforementioned loans, see “Item 5.B. Liquidity and Capital Resources—Indebtedness Financing”.

Use of Reservoirs

We draw water for use in the São Paulo metropolitan area from the Guarapiranga and Billings reservoirs.  We do not pay any fees for the
use  of  these  reservoirs,  although  we  are  responsible  for  maintaining  them  and  funding  their  operating  costs.    The  State  incurs  no  operating
costs on our behalf.

EMAE, a company that is also controlled by the State of São Paulo, has a concession to produce hydroelectric energy using water from the
same  reservoirs.    EMAE  commenced  various  lawsuits  against  us  in  the  past  seeking  compensation  for  the  water  we  draw  from  these
reservoirs.  Those lawsuits have now been settled by way of an agreement between EMAE and our company. 

The  settlement  agreement  settled  the  compensation  arrangements  between  EMAE  and  our  company  regarding  compensation  for  our
capture and use of the water on the one hand, as well as apportionment of the maintenance, operation and monitoring costs for the reservoirs
on the other hand.  It requires us to pay the following amounts to EMAE:

·         R$46.3 million, plus inflation adjustments indexed to the IPCA index, payable in five annual installments from April 2017 through

April 2022, plus

·         R$6.6 million, plus inflation adjustments indexed to the IPCA index, payable in 25 annual installments from October 2017 through

October 2042.

If we fail to pay any installment to EMAE when due, all remaining amounts to be paid under the agreement will become immediately due

and payable.  

On April 11, 2016, we were also named in a separate lawsuit commenced by minority shareholders of EMAE against the State of São
Paulo, as controlling shareholder of EMAE.  The minority shareholders are seeking an order to require the State to stop us from drawing water
from  the  reservoirs  without  paying  compensation  to  EMAE,  and  to  allow  EMAE  to  pump  water  from  the  reservoirs  for  its  hydroelectric
facility.  The plaintiffs allege that the State, in its capacity as controlling shareholder of EMAE, has acted unduly to EMAE’s detriment and in
favor of our company.  The settlement agreement between EMAE and us will not necessarily put an end to this separate lawsuit.

In  addition,  on  August  7,  2017  we  were  named  in  a  new  lawsuit  against  us,  EMAE  and  ANEEL,  brought  by  Alvaro  Luiz  de  Lima  de
Alvares  Otero,  another  minority  shareholder  of  EMAE,  requesting  the  annulment  of  ANEEL’s  order  approving  the  settlement  agreement
mentioned above, as well as the condemnation of SABESP for indemnifying EMAE for damages suffered by EMAE. The plaintiff alleges that
the order is illegal and harmful, jeopardizing the operational viability of the Henry Borden hydroelectric power plant,  as  well  as  the  energy
security of the State of São Paulo, the Southeast region of Brazil and Brazil as a whole. The judge dismissed this lawsuit without judgment on
the merits, but this decision remains subject to appeal.

If one of the ongoing lawsuits by minority shareholders of EMAE requires the State to make a different decision regarding water use, our
ability to draw water from the Guarapiranga and Billings reservoirs may be compromised.  If we were no longer able to draw water from these
reservoirs, we would have to transport water from locations farther away, which would increase our water transportation costs and may affect
our ability to provide adequate service in the region.

Agreements with Lower Tariffs

We  have  entered  into  agreements  with  public  entities,  including  State  entities  and  municipalities,  which  manage  approximately  8,914
properties.  Under these agreements, these public entities pay a different tariff which is approximately 25.0% lower than the tariff that applies
for the public entities that have not entered into these agreements, provided such entities implement our Program for Rational Use of Water
(Programa  de  Uso  Racional  da  Água  –  PURA),  which  has  a  fixed  target  for  reduction  or  maintenance  of  water  consumption,  according  to
technical evaluations carried out by us.  These agreements are valid for a 12‑month term with automatic renewal for equal periods.  Pursuant to
the terms of these agreements, if these entities fail to make any payment on a timely basis to us, we have the right to cancel the agreement,
thereby revoking the 25.0% tariff reduction.

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Personnel Assignment Agreement among Entities Related to the State Government

We have personnel assignment agreements with entities related to the State Government, under which the expenses are fully passed on and
monetarily reimbursed.  The expenses related to personnel assigned by us to other state government entities in 2017, 2016 and 2015 amounted
to R$9.9 million, R$10.4 million, R$10.5 million, respectively.

There were no expenses related to personnel assigned by other entities to us in 2017. The expenses related to personnel assigned by other

entities to us totaled R$0.01 million in 2016 and R$0.3 million in 2015.

Services Obtained from State Government Entities

As of December 31, 2017 and 2016, we had an outstanding amount payable of R$1.4 million and R$1.9 million, respectively, for services
rendered by São Paulo State government entities, including the supply of electric power by the Energy Company of São Paulo (Companhia
Energética de São Paulo –CESP).

Non‑operating Assets

We lend land, free of charge, to DAEE.  Such non‑operating assets totaled R$1.0 million as of December 31, 2017 and 2016.

Transactions with SABESPREV Pension Fund

SABESPREV  is  a  pension  fund  we  established  to  provide  our  employees  with  retirement  and  pension  benefits.    The  assets  of
SABESPREV are independently held, but we nominate 50.0% of SABESPREV’s board of directors, including the chairman of the board, who
has the deciding vote pursuant to the applicable legislation.  Both we and our employees make contributions to SABESPREV pension plans. 
We contributed R$19.2 million, R$10.8 million and R$9.5 million in 2017, 2016 and 2015, respectively.  On May 29, 2001, a federal law was
enacted  which,  among  other  provisions,  limits  the  amount  mixed  capital  companies,  like  us,  may  contribute  to  their  pension  plans. 
Specifically, the ordinary contributions made by us to our pension plans may not exceed the contributions made by the beneficiaries of these
plans.

Our original pension plan (the Defined Benefit Plan) has an actuarial deficit.  We have commenced studies to manage this deficit and have
also created a new, Defined Contribution Plan (SABESPREV Mais).  Our new plan was approved by Previc in June 2010, after which our old
plan  stopped  accepting  new  members.    Contributions  to  the  new  plan  are  also  shared  between  plan  members  and  Sabesp,  and  benefits  are
established  based  on  the  balance  of  the  individual  member’s  account  when  payment  on  his  or  her  benefit  begins.    This  balance  consists  of
contributions and profitability obtained when applying resources.  We intended to have members of the old plan migrate their reserves to the
new plan.  This migration was interrupted by a judicial order as a result of proceedings brought by representative entities for our employees
and ex‑employees.  In October 2010, the judge presiding over the case pronounced in an interim decision that people and reserves were not
allowed to migrate between the plans until a further decision was made.  This decision also prevents the plan from charging contributions to
account for the deficit for those who remained covered by the original plan.  In September 2012, the judge presiding over the case ordered a
financial expert inspection and in early 2013 a financial expert was appointed to the case.  The results of this inspection were unfavorable to
the representative entities for our employees and ex‑employees and in 2016 the proceeding was dismissed, revoking the interim decision made
in October 2010. 

In 2016, participants were again offered the ability to migrate according to the rules established by the regulatory authority.   The Retiree
and Pensioneer Association filed a judicial proceeding questioning the amounts that were transferred from the benefits plan to the individual
accounts of the participants who migrated to the Defined Contribution Plan.  On March 14, 2018, the judge presiding over the case held that
the  adjustment  of  the  Defined  Benefit  Plan’s  actuarial  defecit  was  permitted  and  terminated  the  lawsuit  related  to  the  migration  process  of
members from the Defined Benefit Plan to the Defined Contribution Plan.

Compensation of Management

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The  compensation  paid  by  us  to  the  members  of  our  board  of  directors,  board  of  executive  officers  and  fiscal  committee  amounted  to
R$3.8 million, R$3.9 million and R$4.1 million in 2017, 2016 and 2015, respectively, and it refers to salaries and other short‑term benefits
management.  An additional R$0.6 million, R$0.5 million and R$0.5 million related to the bonus program was accrued to executive officers in
2017, 2016 and 2015.

For further information on management compensation, see “Item 6.B. Directors and Senior Management—Compensation”.

Loan agreement through credit facility

We hold interests in some companies.  Although we do not hold the majority of shares in any of the companies in which we hold interests,
we are party to shareholders’ agreements which provide for the power of veto with regard to certain management proposals and decisions. 
Due  our  significant  influence  on  these  companies  by  way  of  shareholders’  agreements,  for  accounting  purposes,  these  companies  are
accounted for by applying the equity method of accounting.

We entered into loan agreements with the special purpose enterprises Aquapolo Ambiental S.A. on March 30, 2012 and Attend Ambiental

S.A. on May 9, 2014 under which we made loans to finance their respective operations, until their loans due to banks are cleared.

The table below summarizes the terms of those agreements at December 31, 2017:

Companies

Attend Ambiental S.A.

Aquapolo Ambiental S.A.

Aquapolo Ambiental S.A.
Total

___________________

Principal
disbursed

Interest
balance

Total

5,400

5,629

19,000
30,029

3,877

5,209

11,502
20,588

9,277

10,838

30,502
50,617

Interest rate
SELIC + 3.5%
p.a.
CDI +
1.2% p.a.
CDI +
1.2% p.a.
 - 

Maturity

(1)

(2)

(3)
  -

(1)     The loan agreement with Attend Ambiental S.A. had a renewable term of 180 days, starting from the date the funds were made available to the borrower.  The credit facility
became  overdue  on  May  11,  2015  and  is  subject  to  default  interest,  including  monetary  correction  based  on  the  General  Market  Price  Index  (Índice Geral de Preços do
Mercado, or IGP-M), a 2% penalty fee and interest on arrears of 1% per month.  This contract is currently being renegotiated among the parties.

(2)     The R$5.7 million loan agreement originally expired on April 30, 2016. As of February 10, 2016, an amendment to the agreement changed the payment schedule for four

annual installments, the first of which matures on December 30, 2018 and the last of which matures on December 30, 2021.        

(3)         The loan agreement totaling R$19 million originally matured on April 30, 2015, but was extended to October 30, 2015, and on November 25, 2015 a new amendment

changed the payment schedule for three annual installments, the first of which matures on December 30, 2021 and the last of which matures on December 30, 2023.

The amount disbursed is recognized as assets, under “Other receivables,” in the amount of R$1.8 million in current assets and the amount
of R$48.8 million in noncurrent assets. As of December 31, 2017, the total principal and interest due under these loan agreements is R$50.6
million.  The nonpayments reduced our financial income by R$5.0 million in 2017.

Pró-Conexão

In  2012,  the State  of  São  Paulo  approved  a  project  to  subsidize  connections  to  the  sewage  system  for  low‑income  families.    Initially
intended to last eight years, the project involves capital expenditures of up to R$349.5 million of which 80% will be provided by the State
government and 20% by us.  In this period we expect that this program will create 192,000 new sewage connections benefiting approximately
800,000 people.

As of December 2017, we had completed approximately 23.5 thousand sewage connections under the Pró-Conexão program. 

C.      Interests of Experts and Counsel

Not applicable.

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ITEM 8.            FINANCIAL INFORMATION

A.      Financial Statements and Other Financial Information

See “Item 18. Financial Statements”.

Legal Proceedings

We  are  currently  subject  to  numerous  legal  proceedings  relating  to  civil,  tax,  labor,  corporate  and  environmental  issues  arising  in  the
normal course of our business.  Several individual disputes account for a significant part of the total amount of claims against us.  Our material
legal proceedings are described in Note 19 to our financial statements included in this annual report, and that description is incorporated by
reference under this Item.

Civil Public Actions Related to Environmental Matters

We are subject to administrative and judicial proceedings, including proceedings initiated by the Companhia Ambiental do Estado de Sao
Paulo (CETESB), the Office of the Public Prosecutor of the State of São Paulo and non-governmental organizations.  These proceedings result
from alleged environmental damage and relief sought against us includes:  (i) cessation of the release of raw sewage into certain local bodies
of  water;  (ii)  remedies,  in  some  cases,  for  environmental  damages  that  have  not  yet  been  specified  and  evaluated  by  the  court’s  technical
experts;  (iii)  requirements  to  install  and  operate  sewage  treatment  facilities  in  locations  referred  to  in  the  civil  public  actions;  and  (iv)
imposition of a limit on water extracted from the water springs most affected by the water crisis.  In certain cases, we are subject to daily fines
for non‑compliance.  In our response to these lawsuits, we note that the installation and operation of sewage treatment facilities in locations
referred to in the civil public actions is included in our investment plan.  There have already been unfavorable judicial decisions against us and
their effects may include:  (i) investment in works or services not considered by our long‑term investment plan; (ii) early execution of works or
services  that  were  considered  for  execution  in  future  years  in  our  long‑term  investment  plan;  (iii)  payments  related  to  environmental
indemnification; and (iv) a negative impact on our image in national and international markets and in public bodies.

Although we are not able to predict the final outcome of these lawsuits, we believe that the outcome, if unfavorable to us, may have a
material  adverse  effect  on  us.  We  recognize  provisions  for  classify  certain  of  these  proceedings  as  defined  in  Note  3.15  to  our  financial
statements included in this annual report. As of December 31, 2017 we have provisions totaling R$160.4 million for the matters stated in Note
19 to our financial statements included in this annual report.

Other Legal Proceedings

The Civil Entity Coordination Committee of Piracicaba  on December 30, 2003  filed a civil public action against us, the National Water
Agency and the State of São Paulo Treasury Department seeking, among other claims for relief:  (i) the termination of use of 31 m3/s of water
from one of the municipality’s reservoirs; (ii) the creation of a schedule to regulate water use and withdrawal from the Piracicaba river basin
by the Cantareira system to eliminate possible damage to populations downstream; and (iii) the development of an environmental impact study
on the Cantareira system evaluating the impact of water use and withdrawal on the various basins that constitute the system.  In August 2012,
this  civil  public  action  was  decided  favorably  for  us  in  two  lower  courts,  and  the  plaintiff’s  appeal  to  a  higher  court  seeking  special  and
extraordinary recourse was denied based on inadmissibility.  We are currently awaiting a court decision on the action brought by the plaintiff
against the decisions of inadmissibility cited.  The amount involved in this proceeding as of December 31, 2017 is R$24.9 billion. We have
assessed that we do not have a current obligation as a result of a past event, and accordingly have not made any provisions. 

The  Public  Prosecutor’s  Office  of  the  State  of  São  Paulo  on  November  30,  2012  filed  a  civil  public  action  against  us  seeking:    (i)  the
nullification of the contract we entered with the Municipality of São Paulo on June 23, 2010 regarding the service of water supply and sewage
services; (ii) our exclusion from the B3’s Corporate Sustainability Index; and (iii) sewage treatment coverage of the entire Municipality of São
Paulo by 2018.  The plaintiff’s request for an injunction was denied, and the courts maintained this decision after we presented our defense. 
On November 18, 2014, the case was dismissed in the first instance, and the plaintiff then appealed this dismissal.  We are currently waiting
the court’s ruling on the appeal.  The amount involved in these proceedings is R$15.9 billion as of December 31, 2017.  We have assessed that
we do not have a current obligation as a result of a past event, and accordingly have not made any provisions.

Dividends and Dividend Policy

Amounts Available for Distribution

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At each annual shareholders’ meeting, the board of directors is required to recommend the allocation of net profits for the preceding fiscal
year.    For  purposes  of  Brazilian  Corporate  Law,  net  profits  are  defined  as  net  income  after  income  tax  and  social  contribution  tax  for  such
fiscal year, net of any accumulated losses from prior fiscal years and any amounts allocated to employees’ and management’s participation in
our profits.  In accordance with Brazilian Corporate Law, the amounts available for dividend distribution are the amounts equal to half of the
net profit as increased or reduced by:

·         the amount intended to form the legal reserve; and

·                 the amount intended to form the reserves for contingencies and any written-off amounts of the same reserves formed in previous

fiscal years.

We are required to maintain a legal reserve, to which we must allocate 5.0% of net profits for each fiscal year until the amount for such
reserve equals 20.0% of our paid‑in capital.  However, we are not required to make any allocations to our legal reserve in respect of any fiscal
year in which the aggregate amount of the legal reserve plus our other established capital reserves exceeds 30.0% of our capital.  Net losses, if
any, may be offset against the legal reserve.  As of December 31, 2017, 2016 and 2015 the balance of our legal reserve was R$1,058.3 million,
R$923.3 million and R$785.0 million, respectively, which was equal to 10.6%, 9.3% and 7.8%, respectively, of our capital.

Brazilian Corporate Law also provides for two discretionary allocations of net profits that are subject to approval by the shareholders at
each annual shareholders’ meeting.  First, a percentage of net profits may be allocated to a contingency reserve for anticipated losses that are
deemed  probable  in  future  years.    Any  amount  so  allocated  in  a  prior  year  must  be  either  reversed  in  the  fiscal  year  in  which  the  loss  was
anticipated if such loss does not in fact occur, or written off in the event that the anticipated loss occurs.  Second, if the mandatory distributable
amount  exceeds  the  sum  of  realized  net  profits  in  any  given  year,  such  excess  may  be  allocated  to  an  unrealized  revenue  reserve.    Under
Brazilian Corporate Law, realized net profits is defined as the amount of net profits that exceeds the net positive result of equity adjustments
and profits or revenues from operations with financial results after the end of the next succeeding fiscal year.

Under Brazilian Corporate Law, any company may authorize in its bylaws the creation of a discretionary reserve.  Bylaws which authorize
the allocation of a percentage of a company’s net income to the discretionary reserve must also indicate the purpose, criteria for allocation and
maximum amount of the reserve.  We may also allocate a portion of our net profits for discretionary allocations for plan expansion and other
capital investment projects, the amount of which would be based on a capital budget previously presented by management and approved by
our shareholders.  Under Law No. 10,303/2001 of October 31, 2001, as amended, capital budgets for more than one year must be revised at
each annual shareholders’ meeting.  After completion of the relevant capital projects, we may retain the allocation until the shareholders vote
to transfer all or a portion of the reserve to capital or retained earnings. As of December 31, 2017, 2016 and 2015 we had an investment reserve
of R$6,939.3 million, R$5,249.8 million and R$3,273.6 million, respectively.

The amounts available for distribution may be further increased by a reversion of the contingency reserve for anticipated losses constituted
in  prior  years  but  not  realized.    The  amounts  available  for  distribution  are  determined  on  the  basis  of  our  financial  statements  prepared  in
accordance with Brazilian GAAP.

The legal reserve is subject to approval by the shareholder vote at our annual shareholders’ meeting and may be transferred to capital but

is not available for the payment of dividends in subsequent years.

Mandatory Distribution

Brazilian Corporate Law generally requires that the bylaws of each Brazilian corporation specify a minimum percentage of the amounts
available  for  distribution  by  such  corporation  for  each  fiscal  year  that  must  be  distributed  to  shareholders  as  dividends,  also  known  as  the
mandatory distributable amount.  Under our bylaws, the mandatory distributable amount has been fixed at an amount equal to not less than
25.0% of the amounts available for distribution, to the extent amounts are available for distribution at the end of each given fiscal year.

The mandatory distribution is based on a percentage of adjusted net income, not lower than 25.0%, rather than a fixed monetary amount
per share.  Brazilian Corporate Law, however, permits a publicly held company, such as us, to suspend the mandatory distribution if the board
of directors and the fiscal committee report to the shareholders’ meeting that the distribution would be inadvisable in view of the company’s
financial condition.  The suspension is subject to the approval of holders of common shares.  In this case, the board of directors must file a
justification for such suspension with the CVM.  Profits not distributed by virtue of the suspension mentioned above shall be attributed to a
special  reserve  and,  if  not  absorbed  by  subsequent  losses,  must  be  paid  as  dividends  as  soon  as  the  financial  condition  of  such  company
permits such payments.

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Payment of Dividends

We are required by Brazilian Corporate Law and by our bylaws to hold an annual shareholders’ meeting by the fourth month after the end
of  each  fiscal  year  at  which,  among  other  things,  the  shareholders  have  to  decide  on  the  payment  of  an  annual  dividend  when  profits  were
accrued.  The decision to distribute annual dividends is based on the financial statements prepared for the relevant fiscal year.  Under Brazilian
Corporate Law, dividends generally are required to be paid within 60 days following the date the dividend was declared, unless a shareholders’
resolution sets forth another date for payment, which, in either case, must occur prior to the end of the fiscal year in which the dividend was
declared.  A shareholder has a three year period from the dividend payment date to claim dividends (or interest payments on shareholders’
equity as described under “—Record of Dividend Payments and Interest on Shareholders’ Equity”) distributed on his or her shares, after which
the  amount  of  the  unclaimed  dividends  reverts  to  us.    The  depositary  will  set  the  currency  exchange  date  to  be  used  for  payments  to  ADS
holders as soon as practicable upon receipt of those payments from us.

Our bylaws allow us to pay interim dividends from preexisting and accumulated profits related to the current or preceding fiscal year.

In general, shareholders who are not residents of Brazil must register with the Central Bank to have dividends, sales proceeds or other
amounts with respect to their shares eligible to be remitted outside of Brazil.  The common shares underlying our ADSs are held in Brazil by
Banco Bradesco S.A., as the custodian and agent for the depositary, which is the registered owner of the common shares underlying the ADSs. 
Our current registrar is Banco Bradesco S.A.  The depositary electronically registers the common shares underlying the ADSs with the Central
Bank  and,  therefore,  is  able  to  have  dividends,  sales  proceeds  or  other  amounts  with  respect  to  these  shares  eligible  to  be  remitted  outside
Brazil.  See “Item 10.D. Exchange Controls”.

Payments of cash dividends and distributions, if any, will be made in Brazilian reais to the custodian on behalf of the depositary, which
will then convert such proceeds into U.S. dollars and will cause such U.S. dollars to be delivered to the depositary for distribution to holders of
ADSs.    See  “Item  10.D.  Exchange  Controls”.    Under  current  Brazilian  law,  dividends  generally  paid  to  shareholders  who  are  not  Brazilian
residents, including holders of ADSs, will not be subject to Brazilian withholding income tax, except for dividends declared based on profits
generated prior to December 31, 1995. See “Item 10.E. Taxation”.

Record of Dividend Payments and Interest on Shareholders’ Equity 

Brazilian  corporations  are  permitted  to  distribute  dividends  in  the  form  of  a  tax‑deductible  notional  interest  expense  on  shareholders’
equity in accordance with Law No. 9,249/1995 of December 26, 1995, as amended.  The amount of tax‑deductible interest that may be paid is
calculated by applying the daily pro rata variation of the government’s long-term interest rate (TJLP) on the shareholders’ equity during the
relevant period and cannot exceed the greater of: 

·         50.0% of net income (before taking into account such distribution and any deductions for income taxes and after taking into account

any deductions for social contributions on net profits) for the period in respect of which the payment is made; or

·         50.0% of earnings reserves and retained earnings.

Any payment of interest on shareholders’ equity to holders of ADSs or common shares, whether or not they are Brazilian residents, is
subject to Brazilian withholding income tax at the rate of 15.0% or 25.0% if the beneficiary is resident in a low tax jurisdiction (tax haven). 
See “Item 10.E. Taxation”.  The amount paid to shareholders as interest on shareholders’ equity, net of any withholding tax, may be included
as part of the mandatory dividends distributable amount as prescribed in Brazilian Corporate Law.

Dividends and interest on shareholders’ equity over the minimum established in a company’s bylaws are recognized when approved by the
shareholders in the general meeting.  Consequently, the amounts recognized as of December 31, 2017 correspond to the minimum established
by law of 25.0% of the net income and the difference of R$703.9 million will be recorded in 2018 after the annual shareholders’ meeting.

Distributions of dividends

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The  following  table  sets  forth  the  distributions  of  dividends  that  we  made  to  our  shareholders  in  respect  of  our  2017,  2016  and  2015

earnings.  All these amounts distributed or to be distributed were or will be in the form of interest on shareholders’ equity.

Year ended December 31,

2017
2016
2015

Aggregate amount
proposed
(in millions of reais)

Payment Dates

Payment per share

703.9
823.5
149.9

June 26, 2018
June 27, 2017
June 28, 2016

1.03
1.20
0.22

Payment per ADS
(in reais)

1.03
1.20
0.22

*       We recorded dividends in the amount of R$598.3 million, which pursuant to our bylaws is our minimum dividend amount.  The dividends are expected to be paid on

June 26, 2018.

Dividend Policy

We intend to declare and pay dividends and/or interest on shareholders’ equity, as required by Brazilian Corporate Law, our bylaws and
our  dividend  policy.    Our  board  of  directors  may  propose  the  distribution  of  interest  on  shareholders’  equity,  calculated  based  on  our
semiannual  or  quarterly  financial  statements.    The  declaration  of  dividends  is  annual,  including  dividends  in  excess  of  the  mandatory
distribution, and requires approval by the vote of the majority of the holders of our common shares. The proposed distribution of dividends
should consider (i) the need for investments to universalize basic sanitation services; (ii) the achievement of our corporate purpose, as set forth
in  our  bylaws;  (iii)  the  cash  generation  and  cash  requirements;  and  (iv)  our  economic  and  financial  sustainability.  The  amount  of  any
distributions will depend on many factors, such as our results of operations, financial condition, cash requirements, prospects and other factors
deemed  relevant  by  our  board  of  directors  and  shareholders.    Within  the  context  of  our  tax  planning,  we  may  in  the  future  continue  to
determine that it is in our best interest to distribute interest on shareholders’ equity.

B.      Significant Changes

Other than as disclosed in this annual report, no significant change has occurred since the date of the audited financial statements included

in this annual report.

ITEM 9.            THE OFFER AND LISTING

A.      Offer and Listing Details

Market Price of Common Shares

Our common shares have been listed on the B3 under the symbol “SBSP3” since June 4, 1997 and, starting on April 24, 2002, have been

included in the Novo Mercado segment of that exchange.  As of December 31, 2017, we had 5,532 registered holders of common shares.

On  April  30,  2007,  our  shareholders  approved  a  reverse  stock  split  of  125  common  shares  into  one  common  share.    Following  a  ratio
change effected on January 24, 2013, each ADS currently represents one of our common shares.  On April 22, 2013 our shareholders approved
a  stock  split,  following  which  each  common  share  represented  three  new  common  shares.    IFRS  requires  the  retrospective  application  of
earnings‑per‑share computations for stock dividends, stock splits, and reverse splits.

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The table below sets forth, for the periods indicated, the reported high and low closing sale prices in reais for common shares on the B3. 
The table also sets forth prices per ADS assuming that ADSs had been outstanding on all such dates and translated into U.S. dollars at the
commercial market rate for the sale of U.S. dollars for each of the respective dates of such quotations.  In addition, the table sets forth the
average daily trading volume for our common shares.

Reais per common share
High
Low

U.S. dollar equivalent per

(1)

ADS

Low

High

Average daily trading
volume

2018
January
February
March
April
May (through May 24)
2017
First Quarter
Second Quarter
Third Quarter
Fourth Quarter
2016
First Quarter
Second Quarter
Third Quarter
Fourth Quarter
2015 
First quarter
Second quarter
Third quarter
Fourth quarter
2014 
First quarter
Second quarter
Third quarter
Fourth quarter
2013 
First quarter
Second quarter(2) 
Third quarter
Fourth quarter

33.24
33.34
34.11
33.28
25.83
27.56
28.37
27.56
30.12
28.46
16.62
16.62
25.59
28.39
26.58
13.25
13.25
15.74
14.50
16.00
15.98
19.61
19.60
19.30
15.98
19.55
85.00
20.40

19.55
21.40

36.89
38.30
38.75
35.70
34.50
35.38
34.38
34.14
35.38
34.52
33.70
21.32
29.08
31.49
33.70
20.29
19.40
19.65
18.99
20.29
25.96
25.96
24.35
23.97
20.50
32.13
96.40
31.38

23.96
26.55

10.24
10.16
10.22
9.71
6.97
8.39
8.67
8.39
9.42
8.69
4.11
4.11
7.12
8.50
7.98
5.10
5.10
5.07
4.09
4.02
5.83
8.37
8.81
8.47
5.83
8.15
41.90
9.06

8.15
9.70

11.65
11.83
11.77
10.30
9.74
11.17
11.17
11.04
11.17
10.87
10.51
5.27
9.06
9.58
10.51
5.45
6.10
6.46
5.92
5.45
10.83
10.83
10.81
10.78
8.07
15.95
47.87
15.66

10.76
11.28

941,119
1,388,138
1,827,938
1,422,805
2,088,094
1,612,448
1,531,092
1,881,846
1,487,653
1,554,779
1,973,766
1,551,121
2,469,756
1,450,438
1,688,341
1,341,147
1,474,031
1,314,025
1,273,028
1,306,283
1,432,670
1,605,502
1,386,168
1,398,368
1,343,589
1,373,958
557,193
1,755,594

1,719,845
1,401,226

(1)     Following a ratio change effected on January 24, 2013, each ADS represents one common shares.
(2)     After April 22, 2013 our common shares are traded considering the stock split.

Market Price of ADSs

Our ADSs, each of which represents one of our common shares, as of the date of this annual report, are listed on the NYSE under the
symbol “SBS”.  Prior to June 8, 2007, each ADS represented 250 of our common shares.  From that date through January 23, 2013, each ADS
represented two of our common shares.  Following a ratio change effected on January 24, 2013, each ADS currently represents one of our
common  shares.    On  April  22,  2013  our  shareholders  approved  a  stock  split,  following  which  each  common  share  represented  three  new
common shares. Our ADSs began trading on the NYSE on May 10, 2002 in connection with the initial offering of our equity securities in the
United States. 

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The table below sets forth, for the periods indicated, the reported high and low closing prices for our ADSs on the NYSE.

Price in U.S. dollars per ADS
High
Low

Average daily
trading volume

2018

January
February
March
April
May (through May 24)
2017
First quarter
Second quarter
Third quarter
Fourth quarter
2016
First quarter
Second quarter
Third quarter
Fourth quarter
2015 
First quarter
Second quarter
Third quarter
Fourth quarter
2014 
First quarter
Second quarter
Third quarter
Fourth quarter
2013 
First quarter(1)
Second quarter(2)
Third quarter
Fourth quarter

10.23
10.14
10.32
9.74
7.01
8.39
8.81
9.47
9.47
8.73
4.07
4.07
5.45
6.12
7.89
3.57
4.86
5.00
3.57
3.88
5.86
8.39
8.86
8.11
5.86
41.60
9.33

8.38

9.76
41.60

11.47
11.72
11.78
10.43
9.95
11.20
11.13
11.20
11.20
10.81
10.52
6.64
6.65
9.71
10.52
6.56
6.39
6.56
5.93
5.38
10.93
10.83
10.93
10.86
8.56
48.63
15.88

10.82

11.45
48.63

1,339,009
1,488,395
2,339,937
1,495,140
2,597,381
1,772,612
1,521,758
1,802,381
1,802,381
1,652,643
2,317,594
2,079,094
2,571,512
2,680,041
1,774,031
2,300,672
2,987,516
2,212,398
2,299,456
1,734,132
2,554,714
2,781,129
2,281,039
2,197,585
2,965,438
490,280
1,649,436

2,055,875

1,725,844
490,280

(1)     After January 23, 2013 our common shares have traded considering the ratio change.  On April 22, 2013 our shareholders approved a stock split, following which each

common share represented three new common shares.

(2)     After April 29, 2013 our ADSs are traded considering the stock split.

B.      Plan of Distribution

Not applicable.

C.      Markets

Trading on the Brazilian Stock Exchange

The preferred shares and common shares are traded on the B3, the only Brazilian stock exchange that trades shares.  Trading on the B3 is
limited to brokerage firms and a limited number of authorized entities.  The CVM and the B3 have discretionary authority to suspend trading
in shares of a particular issuer under certain circumstances.

Trading  on  the  B3  is  conducted  between  10:00  a.m.  and  4:55  p.m.  or  from  10:00  a.m.  to  5:55  p.m.  (during  daylight  savings  time  in
Brazil).  The B3 also permits trading from 5:30 p.m. to 6:00 p.m. during a different trading period called the “after market”. The after-market
session is restricted to certain stocks that were traded in the portfolios IBOV and/or IBrX and that were traded on the same day during the
regular negotiation. Trading during aftermarket is subject to regulatory limits on price volatility and on the volume of shares transacted through
internet brokers.

In  order  to  maintain  better  quality  control  over  the  fluctuation  of  its  index,  the  B3  has  adopted  a  “circuit  breaker”  system  pursuant  to
which trading sessions are suspended (i) for a period of 30 minutes whenever the index of this stock exchange falls more than 10% from the
index registered for the previous day; (ii) for one hour if the index of this stock exchange falls 15% or more from the index registered for the
previous day, after the reopening of trading; and (iii) for a certain period of time to be defined by the B3, if the index of this stock exchange
falls 20% or more from the index registered for the previous day, after the reopening of trading.  The minimum and maximum price is based on
a reference price for each asset, which will be the previous session’s closing quote, when considering the asset at the beginning of the day
before the first trade, or the price of the day’s first trade.  The asset’s reference price will be altered during the session if there is an auction
sparked by the intraday limit being breached.  In this case the reference price will become whatever results from the auction.

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The B3 settles the sale of shares three business days after they have taken place, without monetary adjustment of the purchase price.  The
shares are paid for and delivered through a settlement agent affiliated with the B3.  The B3 performs multilateral compensation for both the
financial obligations and the delivery of shares.  According to the B3’s regulations, financial settlement is carried out by the Central Bank’s
reserve transfer system.  The securities are transferred by the B3’s custody system.  Both delivery and payment are final and irrevocable.

Trading  on  the  B3  is  significantly  less  liquid  than  trading  on  the  NYSE  or  other  major  exchanges  in  the  world.    Although  any  of  the
outstanding shares of a listed company may trade on the B3, in most cases fewer than half of the listed shares are actually available for trading
by the public, the remainder being held by a controlling group or by government entities.

Trading on the B3 by a holder not deemed to be domiciled in Brazil for Brazilian tax and regulatory purposes, or a “non‑Brazilian holder,”
is subject to certain limitations under Brazilian foreign investment regulations.  With limited exceptions, non‑Brazilian holders may trade on
Brazilian  stock  exchanges  in  accordance  with  the  requirements  of  CMN  Resolution  No.  4,373/2014,  which  requires  that  securities  held  by
non‑Brazilian  holders  be  maintained  in  the  custody  of  financial  institutions  authorized  by  the  Central  Bank  and  by  the  CVM  or  in  deposit
accounts with financial institutions.  In addition, Resolution No. 4,373/2014 requires non‑Brazilian holders to restrict their securities trading to
transactions on the B3 or qualified over‑the‑counter markets.  With limited exceptions, non‑Brazilian holders may not transfer the ownership
of investments made under Resolution No. 4,373/2014 to other non‑Brazilian holders through a private transaction.  See “Item 10.E. Taxation
—Brazilian Tax Considerations—Taxation of Gains” for a description of certain tax benefits extended to non‑Brazilian holders who qualify
under Resolution No. 4,373/2014.

The Novo Mercado Segment

Since  April  24,  2002,  our  common  shares  have  been  listed  on  the  Novo Mercado  segment  of  the  B3.    The  Novo Mercado  is  a  listing
segment designed for the trading of shares issued by companies that voluntarily undertake to abide by some additional corporate governance
practices and disclosure requirements in addition to those already required under Brazilian law.  A company in the Novo Mercado must follow
good practices of corporate governance.  These rules generally increase shareholders’ rights and enhance the quality of information provided to
shareholders.    On  April  18,  2002,  June  19,  2006,  April  23,  2012  and  April  27,  2018  our  shareholders  approved  changes  to  our  bylaws  to
comply with the Novo Mercado requirements.

In addition to the obligations imposed by current Brazilian law, a company listed on the Novo Mercado is obligated to:

·         maintain only voting shares; 

·         hold public offerings of shares in a manner favoring diversification of the company’s shareholder base and broader access to retail

investors;

·         grant tag along rights for all shareholders in connection with a transfer of control of the company;

·         limit the term of all members of the board of directors to two years;

·         hold a tender offer by the company’s controlling shareholder (the minimum price of the shares to be offered will be determined by an

appraisal process) if it elects to delist from the Novo Mercado, unless a waiver is granted by the company’s shareholders;

·         maintain a related party transactions policy, including (i) the criteria to be followed in the performance and approval of related party
transactions,  (ii)  the  procedures  for  identifying  conflicts  of  interest  and  establishing  voting  restrictions  for  conflicted  shareholders,
directors and executive officers, and (iii) the procedures for identifying related parties and related party transactions;

·         the chairman of the board of directors is prohibited from simultaneously holding the position of chief executive officer;

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·         the board of directors must disclose its opinion on takeover proposals within 15 days from the presentation of the proposal;

·         relevant facts, notices to market or to shareholders and press releases must be made in English simultaneously with the disclosure

made in Portuguese;

·         ensure that at least two or 20.0% (whichever is greater) of the members of the board of directors are independent, as defined under

the Novo Mercado regulation;

·                 maintain a minimum free float of at least 25.0% of the outstanding capital stock of the company, or 15.0% in the event that the

average daily trading volume is greater than R$25.0 million;

·         the company must have an internal audit committee;

·         disclose information on the share ownership of controlling shareholders and certain related parties on a monthly basis; and

·         the company must adopt and publish a code of conduct approved by the board of directors, as well as, policies for (i) compensation;
(ii)  election  of  board  and  committee  members;  (iii)  risk  management;  (iv)  related  party  transactions;  and  (v)  the  purchasing  and
trading of securities.

Companies already listed in the Novo Mercado segment  have  until  April  2021  to  make  the  necessary  changes  in  order  to  comply  with
these  new  rules.  We  are  working  to  implement  such  changes  and  believe  that  such  implementation  will  be  completed  by  the  April  2021
deadline.

Regulation of Brazilian Securities Markets

The  Brazilian  securities  markets  are  principally  governed  by  Law  No.  6,385/1976  of  December  7,  1976,  and  Brazilian  Corporate  Law,
each  as  amended  and  supplemented,  and  by  regulations  issued  by  the  CVM,  which  has  regulatory  authority  over  the  stock  exchanges  and
securities markets generally, by the CMN, and by the Central Bank, which has licensing authority over brokerage firms and regulates foreign
investment and foreign exchange transactions.  These laws and regulations, among others, provide for disclosure requirements applicable to
issuers of traded securities, protection of minority shareholders and criminal penalties for insider trading and price manipulation.  They also
provide for licensing and oversight of brokerage firms and governance of the Brazilian stock exchanges.  Nevertheless, the Brazilian securities
markets are not as highly regulated and supervised as the U.S. securities markets.

Under Brazilian Corporate Law, a company is either public (companhia aberta), such as we are, or closely held (companhia fechada).  All
public companies, including us, are registered with the CVM and are subject to reporting requirements.  A company registered with the CVM
may have its securities traded on the Brazilian stock exchanges or in the Brazilian over‑the‑counter market.  Our common shares are listed and
traded on the B3 and may be traded privately subject to some limitations.

To be listed on a Brazilian stock exchange a company must apply for registration with the CVM and the stock exchange where the head

office of the company is located.

We have the option to ask that trading in our securities on the B3 be suspended in anticipation of a material announcement.  Trading may
also  be  suspended  on  the  initiative  of  the  B3  or  the  CVM,  among  other  reasons,  based  on  or  due  to  a  belief  that  a  company  has  provided
inadequate information regarding a material event or has provided inadequate responses to the inquiries by the CVM or the São Paulo Stock
Exchange.

The  Brazilian  over‑the‑counter  market  consists  of  direct  trades  between  individuals  in  which  a  financial  institution  registered  with  the
CVM serves as intermediary.  No special application, other than registration with the CVM, is necessary for securities of a public company to
be traded in this market.  The CVM requires that it be given notice of all trades carried out in the Brazilian over‑the‑counter market by the
respective intermediaries.

Trading on the B3 by non‑residents of Brazil is subject to limitations under Brazilian foreign investment and tax legislation.  The Brazilian
custodian for our common shares underlying the ADSs must, on behalf of the depositary for our ADSs, obtain registration from the Central
Bank  to  remit  U.S.  dollars  abroad  for  payments  of  dividends,  any  other  cash  distributions,  or  upon  the  disposition  of  the  shares  and  sales
proceeds thereto.  In the event that a holder of ADSs exchanges ADSs for common shares, the holder will be entitled to continue to rely on the
custodian’s  registration  for  five  business  days  after  the  exchange.    Thereafter,  the  holder  may  not  be  able  to  obtain  and  remit  U.S.  dollars
abroad  upon  the  disposition  of  our  common  shares,  or  distributions  relating  to  our  common  shares,  unless  the  holder  obtains  a  new
registration.  See “Item 10.D. Exchange Controls”.

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D.      Selling Shareholders

Not applicable.

E.      Dilution

Not applicable.

F.       Expenses of the Issue

Not applicable.

ITEM 10.         ADDITIONAL INFORMATION

A.      Share Capital

Not applicable.

B.      Memorandum and Articles of Association

The  following  is  a  summary  of  the  material  terms  of  our  common  shares,  including  related  provisions  of  our  bylaws  and  Brazilian

Corporate Law.  This description is qualified by reference to our bylaws and to Brazilian law.

Corporate Purposes

We are a mixed capital company (sociedade de economia mista) of unlimited duration, incorporated on September 6, 1973, with limited
liability,  duly  organized  and  operating  under  Brazilian  Corporate  Law.    As  set  forth  in  Article  2  of  our  bylaws,  our  corporate  purpose  is  to
render  basic  sanitation  services,  aimed  at  the  universalization  of  basic  sanitation  in  the  state  of  São  Paulo  without  harming  our  long‑term
financial sustainability.  Our activities comprise water supply, sanitary sewage services, urban rainwater management and drainage services,
urban  cleaning  services,  solid  waste  management  services  and  related  activities,  including  the  planning,  operation,  maintenance  and
commercialization  of  energy,  and  the  commercialization  of  services,  products,  benefits  and  rights  that  directly  or  indirectly  arise  from  our
assets, operations and activities.  We are allowed to act, in a subsidiary form, in other Brazilian locations and abroad.

Directors’ Powers

Although our bylaws contain no specific provisions regarding a director or executive officer’s power to vote on a proposal, arrangement or
contract  in  which  that  director  has  a  material  interest,  under  Brazilian  Corporate  Law,  a  director  or  an  executive  officer  is  prohibited  from
voting in any meeting or with respect to any transaction in which that director or executive officer has a conflict of interest with the company
and must disclose the nature and extent of the conflicting interest to be recorded in the minutes of the meeting.  In any case, a director or an
executive officer may not transact any business with the company, including any borrowing, except on reasonable or fair terms and conditions
that are identical to the terms and conditions prevailing in the market or offered by third parties.

Under our bylaws, our shareholders are responsible for establishing the compensation we pay to the members of our board of directors,

members of the fiscal committee and the executive officers.

Pursuant to Brazilian Corporate Law, each member of our board of executive officers must be a resident in Brazil.  Our bylaws do not

establish any mandatory retirement age limit.

See also “Item 6.A. Directors and Senior Management”.

Description of Common Shares

General

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Each  common  share  entitles  the  holder  thereof  to  one  vote  at  our  annual  or  special  shareholders’  meetings.    Brazilian  Corporate  Law
requires  that  all  our  shareholders’  meetings  be  called  by  publication  of  a  notice  in  the  Diário  Oficial  do  Estado  de  São  Paulo,  the  official
government publication of the State of São Paulo, and in a newspaper of general circulation in our principal place of business, currently the
city of São Paulo, at least fifteen days prior to the meeting.  In addition, the CVM requires issuers of American Depositary Shares, like us, to
issue the first call for a shareholders’ meeting up to 30 days before such shareholders’ meeting. The quorum to hold shareholders’ meetings on
first call requires the attendance of shareholders, either in person or by proxy, representing at least 25.0% of the shares entitled to vote and, on
second call, the meetings can be held with the attendance of shareholders, also either in person or by proxy, representing any number of shares
entitled to vote.

Under Brazilian Corporate Law, our common shares are entitled to dividends or other distributions made in respect of our common shares
in proportion to their share of the amount available for the dividend or distribution.  See “Item 8A. Financial Statements and Other Financial
Information—Dividends  and  Dividend  Policy”  for  a  more  complete  description  of  payment  of  dividends  and  other  distributions  on  our
common shares.  In addition, upon any liquidation of our Company, our common shares are entitled to our remaining capital after paying our
creditors in proportion to their ownership interest in us.

In principle, a change in shareholder rights, such as the reduction of the compulsory minimum dividend, is subject to a favorable vote of
the shareholders representing at least one half of our voting shares.  Under some circumstances that may result in a change in the shareholder
rights, such as the creation of preferred shares, Brazilian Corporate Law requires the approval of a majority of the shareholders who would be
adversely  affected  by  the  change  attending  a  special  meeting  called  for  such  reason.    It  should  be  emphasized,  however,  that  our  bylaws
expressly  prevents  us  from  issuing  preferred  shares.  Brazilian  Corporate  Law  specifies  other  circumstances  where  a  dissenting  shareholder
may also have appraisal rights.

According to Brazilian Corporate Law, neither a company’s bylaws nor actions taken at a general meeting of shareholders may deprive a

shareholder of certain rights, such as:

·         the right to participate in the distribution of profits;

·         the right to participate equally and ratably in any remaining residual assets in the event of liquidation of the company;

·         the right to supervise the management of the corporate business as specified in Brazilian Corporate Law;

·                 the right to preemptive rights in the event of a subscription of shares, debentures convertible into shares or subscription bonuses

(except in some specific circumstances under Brazilian law); and

·         the right to withdraw from the company in the cases specified in Brazilian Corporate Law.

Pursuant  to  Brazilian  Corporate  Law  and  our  bylaws,  each  of  our  common  shares  carries  the  right  to  one  vote  at  our  shareholders’

meetings.  We may not restrain or deny that right without the consent of the holders of a majority of the shares affected.

Neither Brazilian Corporate Law nor our bylaws expressly addresses:

·         staggered terms for directors;

·         cumulative voting, except as described below; or

·         measures that could prevent a takeover attempt.

However, under the laws of the State of São Paulo, the State is required to own at least a majority of our outstanding common shares.

According to Brazilian Corporate Law and its regulations, shareholders representing at least 10 percent of our capital, may request that a
multiple voting procedure be adopted to entitle each share to as many votes as there are board members and to give each shareholder the right
to  vote  cumulatively  for  only  one  candidate  or  to  distribute  their  votes  among  several  candidates.    Pursuant  to  Brazilian  Corporate  Law,
shareholder action must be taken at a shareholders meeting, duly called for and not by written consent.

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In  addition,  shareholders  owning  at  least  15.0%  of  the  capital  may  request  the  right  to  elect,  separately  a  member  of  the  Board  of

Directors.

Preemptive Rights

Each of our shareholders has a general preemptive right to subscribe for shares or securities convertible into shares in any capital increase,
in proportion to his or her ownership interest in us, except in the event of the grant and exercise of any option to acquire shares of our capital
stock.  The preemptive rights are valid for a 30‑day period from the publication of the announcement of the capital increase.  Shareholders are
also entitled to sell this preemptive right to third parties.  Under Brazilian Corporate Law, we may amend our bylaws to eliminate preemptive
rights or to reduce the exercise period in connection with a public offering of shares or an exchange offer made to acquire another company. 

In the event of a capital increase by means of the issuance of new shares, holders of ADSs, or of common shares, would, except under
circumstances described above, have preemptive rights to subscribe for any class of our newly issued shares.  However, an ADS holder may
not be able to exercise the preemptive rights relating to the common shares underlying his or her ADSs unless a registration statement under
the Securities Act is effective with respect to those rights or an exemption from the registration requirements of the Securities Act is available. 
See “Item 3.D. Risk Factors—Risks Relating to Our Common Shares and ADSs—A holder of our common shares and ADSs might be unable
to exercise preemptive rights and tag‑along rights with respect to the common shares”.

Redemption and Rights of Withdrawal

Brazilian Corporate Law provides that, under limited circumstances, a shareholder has the right to withdraw his or her equity interest from
the company and to receive payment for the portion of shareholder’s equity attributable to his or her equity interest.  This right of withdrawal
may be exercised by dissenting our shareholders in the event that at least half of all voting shares outstanding authorize us:

·         to reduce the mandatory distribution of dividends;

·         to merge into another company or to consolidate with another company, subject to the conditions set forth in Brazilian Corporate

Law;

·         to participate in a centralized group of companies, as defined under Brazilian Corporate Law and subject to the conditions set forth

therein;

·         to change our corporate purpose;

·         to split up, subject to the conditions set forth in Brazilian Corporate Law;

·         creating preferred shares or increasing an existing class of preferred shares without maintaining the existing ratio with the remaining

class of preferred shares, unless when already set forth in or authorized by the bylaws;

·         to transform into another type of company;

·         to transfer all of our shares to another company or to receive shares of another company in order to make the company whose shares

are transferred a wholly owned subsidiary of such company, known as incorporação de ações; or

·         to acquire control of another company at a price which exceeds the limits set forth in Brazilian Corporate Law.

The  right  of  withdrawal  lapses  30  days  after  publication  of  the  minutes  of  the  shareholders’  meeting  that  approved  a  corporate  action
described above.  We would be entitled to reconsider any action giving rise to withdrawal rights within 10 days following the expiration of
such rights if the withdrawal of shares of dissenting shareholders would jeopardize our financial condition.  Brazilian Corporate Law allows
companies to redeem their shares at their economic value, subject to the provisions of their bylaws and certain other requirements.  Our bylaws
currently  do  not  provide  that  our  capital  stock  will  be  redeemable  at  its  economic  value  and,  consequently,  any  redemption  pursuant  to
Brazilian Corporate Law would be made based on the book value per share, determined on the basis of the last balance sheet approved by the
shareholders.  However,  if  a  shareholders’  meeting  giving  rise  to  redemption  rights  occurred  more  than  60  days  after  the  date  of  the  last
approved balance sheet, a shareholder would be entitled to demand that his or her shares be valued on the basis of a new balance sheet dated
within 60 days of such shareholders’ meeting.

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In addition, the rights of withdrawal in the third, fourth and eighth bullet points above may not be exercised by holders of shares if such
shares (i) are liquid, defined as being part of the Bovespa index (Índice Bovespa) or other stock exchange index (as defined by the CVM), and
(ii) are widely held, such that the controlling shareholder or companies it controls have less than 50.0% of our shares.  Our common shares are
included on the Bovespa index.

This right of withdrawal may also be exercised in the event that the entity resulting from a stock merger as described above, consolidation
or spin‑off of a listed company fails to become a listed company within 120 days of the shareholders’ meeting at which such transaction was
approved.

We may cancel the right of withdrawal if the payment amount has a material adverse effect on our finances.

Conversion Right

Not applicable because our capital stock is only comprised of common shares.

Special and General Meetings

Unlike the laws governing corporations incorporated under the laws of the United States’ state of Delaware, the Brazilian corporate law
does  not  allow  shareholders  to  approve  matters  by  written  consent  obtained  as  a  response  to  a  consent  solicitation  procedure.    All  matters
subject to approval by the shareholders must be approved in a general meeting, duly convened pursuant to the provisions of Brazilian corporate
law.    Shareholders  may  be  represented  at  a  shareholders’  meeting  by  attorneys‑in‑fact  who  are  (i)  shareholders  of  the  corporation,  (ii)  a
Brazilian attorney, (iii) a member of management or (iv) a financial institution.

General shareholders’ meetings shall be called, convened and deliberated under Brazilian Corporate Law to address all matters of interest
to the company.  General shareholders’ meetings may be called by publication of a notice in the Diário Oficial do Estado de São Paulo and in
a newspaper of general circulation in our principal place of business, and the first call should be made at least 15 days prior to the meeting.  In
our case, the first call is made 30 days in advance due the issuance of ADRs, as recommended by the CVM.  The second call should be made
at least 8 days in advance, if quorum is not reached, pursuant to the Brazilian Corporate Law.

At duly called and convened meetings, our shareholders are empowered to take any action regarding our business.  Shareholders have the
exclusive right, during our annual shareholders’ meetings required to be hold within 120 days of the end of our fiscal year, to approve our
financial statements and to determine the allocation of our net income and the distribution of dividends related to the fiscal year immediately
preceding the meeting.  The members of our board of directors are generally elected at annual shareholders’ meetings.  However, according to
Brazilian corporate law, they can also be elected at extraordinary shareholders’ meetings.  At the request of shareholders holding a sufficient
number of shares, a fiscal committee can be established and its members elected at any shareholders’ meeting.

A special shareholders’ meeting may be held concurrently with the annual shareholders’ meeting and at other times during the year.  Our

shareholders may take the following actions, among others, exclusively at shareholders’ meetings:

·         election and dismissal of the members of our board of directors and our fiscal committee, if the shareholders have requested the setup

of the latter;

·                 approval of the aggregate compensation of the members of our board of directors and board of executive officers, as well as the

compensation of the members of the fiscal committee;

·         amendment of our bylaws;

·         approval of our merger, consolidation or spin‑off;

·         approval of our dissolution or liquidation, as well as the election and dismissal of liquidators and the approval of their accounts;

·         granting stock awards and approval of stock splits or reverse stock splits;

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·         approval of stock option plans for our management and employees, as well as for the management and employees of other companies

directly or indirectly controlled by us;

·         approval, in accordance with the proposal submitted by our board of directors, of the distribution of our net income and payment of

dividends;

·         authorization to delist from the Novo Mercado and to become a private company, except if the cancellation is due to a breach of the
Novo Mercado regulations by management, and to retain a specialized firm to prepare a valuation report with respect to the value of
our shares, in any such events;

·         approval of our management accounts and our financial statements;

·         approval of any primary public offering of our shares or securities convertible into our shares; and

·         deliberate upon any matter submitted by the board of directors.

Limitations on Rights to Own Securities

There  are  no  limitations  under  Brazilian  law  and  our  bylaws  on  the  rights  of  non‑residents  or  foreign  shareholders  to  own  securities,

including the rights of such non‑resident or foreign shareholders to hold or exercise voting rights.

Equal Treatment Provisions

Pursuant to our bylaws and the Novo Mercado regulations, any party that acquires our control must extend a tender offer for the shares
held  by  non‑controlling  shareholders  at  the  same  conditions  and  purchase  price  paid  to  the  controlling  shareholder.    In  addition,  State  Law
No. 119/1973, which created our Company, requires the State to hold the majority of our shares at all times.

Reserves

General

The Brazilian Corporate Law provides that all discretionary allocations of “adjusted income” are subject to shareholder approval and may
be added to capital or distributed as dividends in subsequent years.  In the case of our capital reserve and the legal reserve, they are also subject
to shareholder approval; however, the use of their respective balances is restricted to being added to capital or absorbed by losses.  They cannot
be used as a source for income distribution to shareholders.

Investment Reserve

Our  investment  reserve  is  comprised  specifically  of  internal  funds  for  expansion  of  water  and  sewage  service  systems.    As  of

December 31, 2017, we had an investment reserve of R$6,939.3 million.

Legal Reserve

Under Brazilian Corporate Law, we are required to record a legal reserve to which we must allocate 5% of the adjusted net income each
year until the amount of the reserve equals 20.0% of paid‑in capital.  Any accumulated deficit may be charged against the legal reserve.  As of
December 31, 2017, the balance of our legal reserve was R$1,058.3 million.

Arbitration

In connection with our listing with the Novo Mercado segment of the B3, we, our shareholders, directors and officers have undertaken to
refer to arbitration any and all disputes or controversies arising out of the Novo Mercado rules or any other corporate matters.  See “Item 9.C.
Markets”.  Under our bylaws, any dispute among us, our shareholders and our management with respect to the application of Novo Mercado
rules,  the  Brazilian  Corporate  Law,  the  application  of  the  rules  and  regulations  regarding  Brazilian  capital  markets,  will  be  resolved  by
arbitration conducted pursuant to the B3 Arbitration Rules in the Market Arbitration Chamber.  Any dispute among shareholders, including
holders of ADSs, and any dispute between us and shareholders, including holders of ADSs, will also be submitted to arbitration.

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Options

There are currently no outstanding options to purchase any of our common shares.

C.      Material Contracts

For a description of the material contracts entered into by the State and us, see “Item 7.B. Related Party Transactions—Transactions with

the State of São Paulo” and “Item 7.B. Related Party Transactions—Agreements with the State”.

D.      Exchange Controls

The right to convert dividend or interest payments and proceeds from the sale of shares into foreign currency and to remit such amounts
outside  Brazil  is  subject  to  restrictions  under  foreign  investment  legislation  which  generally  requires,  among  other  things,  that  the  relevant
investments  have  been  registered  with  the  Central  Bank  and  the  CVM.    Such  restrictions  on  the  remittance  of  foreign  capital  abroad  may
hinder  or  prevent  the  custodian  for  our  common  shares  represented  by  our  ADSs  or  the  holders  of  our  common  shares  from  converting
dividends, distributions or the proceeds from any sale of these shares into U.S. dollars and remitting the U.S. dollars abroad.  Holders of our
ADSs could be adversely affected by delays in, or refusal to grant any, required government approval to convert Brazilian currency payments
on the common shares underlying our ADS and to remit the proceeds abroad.

  Accordingly, the proceeds from the sale of ADSs by ADR holders outside Brazil are not subject to Brazilian foreign investment controls,
and holders of the ADSs are entitled to favorable tax treatment under certain circumstances.  See “Item 3.D. Risk Factors—Risks Relating to
Our Common Shares and ADSs—Investors who exchange ADSs for common shares may lose their ability to remit foreign currency abroad
and to obtain Brazilian tax advantages” and “Item 10.E. Taxation—Brazilian Tax Considerations”.

Since  March  30,  2015,  CMN  Resolution  No.  4,373/2014,  of  September  29,  2014,  has  been  in  full  effect,  providing  for  the  issuance  of
depositary  receipts  in  foreign  markets  in  respect  to  shares  of  Brazilian  issuers.    The  CMN  Resolution  No.  4,373/2014,  among  other  acts,
revoked CMN Resolution No. 1,927/1992, of May 18, 1992, CMN Resolution No. 1,289/1987, of March 20, 1987, and CMN Resolution No.
2,689/2000,  of  January  26,  2000.    Under  Brazilian  law  relating  to  foreign  investment  in  the  Brazilian  capital  markets,  foreign  investors
registered with the CVM and acting through authorized custodial accounts managed by local agents may buy and sell shares on Brazilian stock
exchanges without obtaining separate certificates of registration for each transaction.  Foreign investors may register their investment under
Law No. 4,131/1962, of September 3, 1962, as amended, or under CMN Resolution No. 4,373, of September 20, 2014.

The Law No. 4,131/1962 is the main legislation concerning investment of direct foreign capital and foreign direct equity in companies
based  in  Brazil.    It  is  applicable  to  any  amount  of  capital  that  enters  Brazil  in  the  form  of  foreign  currency,  goods  or  services.    Foreign
investment portfolios are regulated by CMN Resolution No. 4,373/2014, CVM Instruction No. 559/2015, of March 27, 2015, which regulates
the approval of ADR programs by the CVM, and CVM Instruction No. 560/2015, of March 27, 2015, which regulates the filing of transactions
and disclosure of information by foreign investors, all reflecting the provisions of CMN Resolution No. 4,373/2014.

As of January 1, 2016, foreign investors that intend to be registered with the CVM shall fulfill the requirements under CVM Instruction
No. 560/2015.  In accordance with CMN Resolution No. 4,373/2014 the definition of a foreign investor includes individuals, legal entities,
mutual  funds  and  other  collective  investment  entities,  domiciled  or  headquartered  abroad.    In  order  to  become  a  4,373  Holder,  a  foreign
investor must:

·         appoint at least one representative in Brazil, with powers to perform actions relating to its investment;

·         appoint an authorized custodian in Brazil for its investments, which must be a financial institution or entity duly authorized by the

Central Bank or CVM;

·         appoint a tax representative in Brazil;

·         through its representative in Brazil, register itself as a foreign investor with the CVM;

·         through its representative in Brazil, register its foreign investment with the Central Bank; and

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·         be registered with the Federal Tax Authority (Secretaria da Receita Federal), or the “RFB”, pursuant to RFB Normative Instruction

No. 1,548/2015, of February 13, 2015, and RFB Normative Instruction No. 1,634/2016, of May 6, 2016. 

E.      Taxation

This  summary  contains  a  description  of  certain  Brazilian  and  U.S.  federal  income  tax  consequences  of  the  purchase,  ownership  and

disposition of common shares or ADSs by a holder.

The summary is based upon the tax laws of Brazil and the federal income tax laws of the United States as in effect on the date of this
annual  report,  which  laws  are  subject  to  change,  possibly  with  retroactive  effect,  regarding  the  U.S.  federal  income  tax,  and  to  differing
interpretations.  Holders of common shares or ADSs should consult their own tax advisors as to the Brazilian, U.S. or other tax consequences
of the purchase, ownership and disposition of common shares or ADSs, including, in particular, the effect of any non-Brazilian, non-U.S., state
or local tax laws.

Although there presently is no income tax treaty between Brazil and the United States, the tax authorities of the two countries have had
discussions in the past regarding such a treaty.  No assurance can be given, however, as to if or when a treaty will enter into force or how it will
affect the U.S. holders of common shares or ADSs.

Brazilian Tax Considerations

The following discussion summarizes the principal Brazilian tax consequences of the acquisition, ownership and disposition of common
shares  or  ADSs  by  a  holder  that  is  not  domiciled  in  Brazil  for  purposes  of  Brazilian  taxation  (a  “non‑Brazilian  holder”).    It  is  based  on
Brazilian laws and regulations as currently in effect, and, therefore, any change in such law may change the consequences described below. 
Each non‑Brazilian holder should consult his or her own tax adviser concerning the Brazilian tax consequences of an investment in common
shares or ADSs.

A  non‑Brazilian  holder  of  ADSs  may  withdraw  them  in  exchange  for  common  shares  in  Brazil.    Pursuant  to  Brazilian  law,  the

non‑Brazilian holder may invest in the common shares under CMN Resolution 4,373/2014, as a 4,373 Holder.

Taxation of Dividends

As a result of the tax legislation adopted on December 26, 1995, dividends based on profits generated after January 1, 1996, including
dividends paid in kind, payable by us in respect of common shares or ADSs, are exempt from withholding income tax.  Dividends relating to
profits  generated  prior  to  January  1,  1996  may  be  subject  to  Brazilian  withholding  income  tax  at  varying  rates,  depending  on  the  year  the
profits were generated.

Beginning in 2008, the Brazilian accounting rules were significantly modified in order to align them with IFRS. After the issuance of such
new rules, a transitory tax regime (regime tributário de transição), or RTT, was created mainly to ensure neutrality of the new accounting rules
in connection with the calculation and payment of corporate taxes on income.  Thus, according to the RTT, Brazilian companies had, only for
purposes of calculation of their taxable profit, to use the accounting rules and criteria that existed until December 2007.

As a result of the application of the RTT, the accounting profit of a Brazilian company might be significantly higher (or lower) than its
taxable  profit.    Although  this  specific  matter  has  not  been  expressly  regulated  by  law,  the  Brazilian  tax  authorities  issued  a  normative
instruction stating that the amount of dividends paid in excess of the profit of a company determined as per the accounting rules and criteria
that existed until December 2007 should be subject to taxation.

On  April  14,  2014,  Law  No.  12,973  was  issued  to,  among  other,  terminate  the  Transitory  Regime  (RTT)  and  regulate  how  corporate
taxable income should be assessed taking as a starting point the accounting profit calculated according to the new accounting rules introduced
as  from  2008.    Such  Law  states  that  dividends  related  to  all  accounting  profits  generated  between  January  2008  and  31  December  2013  in
excess of the established methods and criteria in force in 31 December, 2007, are not subject to withholding tax, and does not integrate the
calculation of income tax and social contribution.  With reference to 2014, the law is not clear, but tax authorities state that dividends paid in
excess of the profit of a company determined as per the accounting rules and criteria that existed until December 2007 should be subject to
withholding  income  tax  at  the  rate  of  15%,  or  25%  if  the  non-Brazilian  holder  is  domiciled  in  a  country  or  location  that  does  not  impose
income  tax  or  where  the  maximum  income  tax  rate  is  lower  than  20%  (“Nil  or  Low  Taxation  Jurisdiction”).    As  of  2015,  in  view  of  the
termination of the RTT, there would be no differences between the accounting and the taxable profit, so that dividends generated since 2015
should be fully paid with no Brazilian withholding tax implications.

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Taxation of Gains

Gains realized on disposition of common shares are subject to income tax in Brazil, regardless of whether the sale or the disposition is
made by a non‑Brazilian holder to a resident or person domiciled in Brazil.  This is due to the fact that the common shares can be considered
assets located in Brazil for purposes of Law No. 10,833/2003.

Thus, gains, for purposes of taxation of gains earned in a sale or disposition of common shares carried out on a Brazilian stock exchange

(which includes transactions carried out on the organized over-the-counter market):

·         are exempt from income tax when assessed on a non‑Brazilian holder that (1) has registered its investment in Brazil with the Central
Bank  under  the  rules  of  CMN  Resolution  No.  4,373/2014,  and  (2)  is  not  a  resident  of  or  domiciled  in  a  Nil  or  Low  Taxation
Jurisdiction; or

·         in all other cases, including gains realized by a Non-Resident Holder that is not a 4,373 Holder and/or is a resident of or domiciled in
a  Nil  or  Low  Taxation  Jurisdiction,  subject  to  income  tax  at  a  15.0%  rate.    In  these  cases,  a  withholding  income  tax  at  a  rate  of
0.005% will be applied and can later be offset with the eventual income tax due on the capital gain.

Any other gains assessed on the disposition of the common shares that are not carried out on the Brazilian stock exchange are subject to
income tax at progressive rates that may vary from 15.0% to 22.5% (15.0% for the part of the gain that does not exceed R$5.0 million, 17.5%
for the part of the gain that exceeds R$5.0 million but does not exceed R$10.0 million, 20.0% for the part of the gain that exceeds R$10.0
million but does not exceed R$30.0 million and 22.5% for the part of the gain that exceeds R$30.0 million), except for Nil or Low Taxation
Jurisdiction, which, in this case, would be subject to income tax at a flat rate of 25.0%. If these gains are related to transactions conducted on
the Brazilian non-organized-over-the-counter market with intermediation, withholding income tax of 0.005% shall also be applicable and can
be offset with the eventual income tax due on the capital gain.

For Brazilian purposes, as of January 2009, a Nil or Low Taxation Jurisdiction is considered a regime:  (i) which does not impose income
tax or does so at a rate of 20% or lower, or (ii) where applicable local legislation imposes restrictions on the disclosure of the shareholding
composition  or  the  ownership  of  investments,  or  on  the  ultimate  beneficiary  of  the  income  derived  from  transactions  carried  out  and
attributable to a non-Brazilian holder.  . A regulation issued by the Brazilian tax authorities on November 28, 2014 (Ordinance 488 of 2014)
decreased this minimum threshold for certain specific cases from 20.0% to 17.0%. The 17.0% threshold applies only to countries and regimes
aligned with international standards of fiscal transparency in accordance with rules to be established by the Brazilian tax authorities. See “—
Discussion on Low or Nil Taxation Jurisdictions” below.

In the case of redemption of securities or capital reduction by a Brazilian corporation, such as ourselves, the positive difference between
the amount effectively received by the non‑Brazilian holder and the corresponding acquisition cost is treated, for tax purposes, as capital gain
derived from disposition of common shares not carried out on a Brazilian stock exchange market, and is therefore subject to income tax at
progressive rates of between 15.0% and 22.5% or at the flat rate of 25.0%, as the case may be.

Any  exercise  of  preemptive  rights  relating  to  the  common  shares  will  not  be  subject  to  Brazilian  income  tax.    Any  gain  on  the  sale  or
assignment  of  preemptive  rights  relating  to  the  common  shares  by  a  non‑Brazilian  holder  of  common  shares  or  ADSs  will  be  subject  to
Brazilian taxation at the same rate applicable to the sale or disposition of common shares.

There is no assurance that the current preferential treatment for holders of ADSs and non‑Brazilian holders of common shares under CMN
Resolution No. 4,373/2014 will continue in the future or that it will not be changed in the future.  Reductions in the rate of tax provided for by
Brazil’s tax treaties do not apply to the tax on gains realized on sales or exchange of common shares.

Sale of ADSs by non-Brazilian holder to another non-Brazilian holder

Gains  realized  outside  Brazil  by  a  non‑Brazilian  holder  on  the  disposition  of  ADSs  to  another  non‑Brazilian  holder  are  not  currently
subject to Brazilian tax.  As mentioned above, according to Law No. 10,833/2003 of December 2003, or Law No. 10,833, the disposition of
assets located in Brazil by a non‑Brazilian holder, whether to other non‑Brazilian holder or Brazilian holders, may become subject to taxation
in Brazil.  Although we believe that the ADSs do not fall within the definition of assets located in Brazil for the purposes of Law no. 10,833,
considering the general and unclear scope of it and the lack of definitive judicial court ruling to act as the leading case in respect thereto, we
are unable to predict whether such understanding will ultimately prevail in the courts of Brazil.

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In case the ADSs are considered assets located in Brazil, gains on disposition of ADSs by a non‑Brazilian holder to a resident in Brazil or
even  to  a  non-Brazilian  resident  may  be  subject  to  income  tax  in  Brazil  according  to  the  rules  described  below  for  ADSs  or  the  tax  rules
applicable to common shares, as applicable.

Exchange of ADSs for common shares

Although there is no clear regulatory guidance, the withdrawal of ADSs in exchange for common shares is not subject to Brazilian income
tax to the extent that, as described above, ADSs do not fall within the definition of assets located in Brazil for the purposes of Law No. 10,833.

Upon receipt of the underlying common shares in exchange for ADSs, non-Brazilian holders may also elect to register with the Central
Bank the U.S. dollar amount of such preferred shares or common shares as a foreign portfolio investment under Resolution No. 4,373/2014 or
as a foreign direct investment under Law  No. 4,131/1962.

Exchange of common shares for ADSs

With reference to the deposit of common shares in exchange for ADSs, the difference between the acquisition cost of the common shares
and the market price of the common shares may be subject to Brazilian income tax at progressive rates that may vary from 15.0% to 22.5%
(15.0%  for  the  part  of  the  gain  that  does  not  exceed  R$5.0  million,  17.5%  for  the  part  of  the  gain  that  exceeds  R$5.0  million  but  does  not
exceed R$10.0 million, 20.0% for the part of the gain that exceeds R$10.0 million but does not exceed R$30.0 million and 22.5% for the part
of the gain that exceeds R$30.0 million), except for non-Brazilian holders located in a Nil or Low Taxation Jurisdiction, which, in this case,
would  be  subject  to  income  tax  at  a  flat  rate  of  25.0%.    In  some  circumstances,  there  may  be  arguments  to  claim  that  this  taxation  is  not
applicable in the case of a non-Brazilian holder that is a 4,373 Holder and is not a resident in a Nil or Low Taxation Jurisdiction.

Discussion on Low or Nil Taxation Jurisdictions

On June 24, 2008, Law No. 11,727/2008 was enacted defining the concept of a “privileged tax regime” in connection with transactions
subject to transfer pricing and thin capitalization rules.  In this conception, privileged tax regimes are more comprehensive than tax havens.  A
“privileged tax regime” is considered to be a jurisdiction which:  (i) does not tax income or taxes income at a maximum rate lower than 20.0%;
(ii) grants tax advantages to a non‑resident entity or individual (a) without requiring substantial economic activity in the jurisdiction of such
non‑resident entity or individual or (b) to the extent such non‑resident entity or individual does not conduct substantial economic activity in the
jurisdiction of such non‑resident entity or individual; (iii) does not tax income generated abroad, or imposes tax on income generated abroad at
a  maximum  rate  lower  than  20.0%;  or  (iv)  restricts  the  ownership  disclosure  of  assets  and  ownership  rights  or  restricts  disclosure  about
economic transactions.

Notwithstanding  the  fact  that  the  “privileged  tax  regime”  concept  was  enacted  in  connection  with  Brazilian  transfer  pricing  and  thin
capitalization rules, there is no assurance that Brazilian tax authorities will not attempt to apply the concept of privileged tax regimes to other
types of transactions, such as investments in the Brazilian financial and capital markets.  We recommend that prospective investors consult
their own tax advisors from time to time to verify any possible tax consequences of Law No. 11,727/2008.

Interest Attributed to Shareholders’ Equity

According to Brazilian laws and our bylaws, we may opt to distribute income as interest attributed to shareholders’ equity as an alternative

to the payment of dividends.

Distribution of an interest on equity charge attributed to shareholders’ equity with respect to common shares or ADSs as an alternative
form of payment to shareholders, including non‑Brazilian holders of common shares or ADSs, is subject to Brazilian withholding income tax
at the rate of 15% or 25%, in case of a Nil or Low Taxation Jurisdiction holder. 

Such payments, subject to certain limitations and requirements, are deductible for Brazilian income tax purposes. This interest is limited to
the daily pro rata variation of the Federal Government’s long-term interest rate, as determined by the Central Bank from time to time, and
cannot exceed the greater of:

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(a)     50% of net income (after the social contribution on net profits and before the provision for corporate income tax, and the amounts

attributable to shareholders as interest on net equity) for the period with respect to which the payment is made; or 

(b)         50% of the sum of retained earnings and earnings reserves as of the date of the beginning of the period with respect to which the

payment is made.

Other Brazilian Taxes

There are no Brazilian inheritance, gift or succession taxes applicable to the ownership, transfer or disposition of common shares or ADSs
by  a  non‑Brazilian  holder,  except  for  gift  and  inheritance  taxes,  which  are  levied  by  some  states  of  Brazil  on  gifts  made  or  inheritances
bestowed by a non‑Brazilian holder to individuals or entities resident or domiciled within such states in Brazil.  There is no Brazilian stamp,
issue, registration, or similar taxes or duties payable by a non‑Brazilian holder of common shares or ADSs.

Tax on foreign exchange transactions (“IOF/Exchange”)

Pursuant  to  Decree  No.  6,306/2007,  dated  December  14,  2007,  as  amended,  or  Decree  No.  6,306/2007,  the  conversion  of  Brazilian
currency  into  foreign  currency  (e.g.,  for  purposes  of  paying  dividends  and  interest)  and  the    conversion  of  foreign  currency  into  Brazilian
currency may be subject to the Tax on Foreign Exchange Transactions or IOF/Exchange.  Currently, for most exchange transactions, the rate of
IOF/Exchange  is  0.38%.    However,  exchange  transactions  carried  out  for  the  inflow  of  funds  in  Brazil  for  investments  in  the  Brazilian
financial and capital market made by a foreign investor (including a Non-Resident Holder, as applicable) are subject to IOF/Exchange at a 0%.
 The  IOF/Exchange  rate  will  also  be  0%  for  the  outflow  of  funds  from  Brazil  related  to  these  types  of  investments,  including  payments  of
dividends and interest on shareholders’ equity and the repatriation of funds invested in the Brazilian market.

The  Brazilian  government  may  increase  the  rate  of  the  IOF/Exchange  to  a  maximum  of  25.0%  of  the  amount  of  the  foreign  exchange

transaction at any time, but such an increase would not apply retroactively.

Tax on transactions involving bonds and securities (“IOF/Bonds Tax”)

The IOF may also be imposed on any transactions involving bonds and securities, including those carried out on Brazilian futures and
commodities stock exchanges.  As a general rule, the rate of this tax for transactions involving common shares or ADSs is currently zero.  The
executive branch, also by a Presidential Decree, may increase the IOF rate by up to 1.5% per day, but only with respect to future transactions.

U.S. Federal Income Tax Considerations

The following discussion is a summary of certain U.S. federal income tax consequences of the acquisition, ownership and disposition of
common  shares  or  ADSs  as  of  the  date  hereof.    This  discussion  applies  only  to  a  beneficial  owner  of  common  shares  or  ADSs  that  is  a
“U.S. holder”.  As used herein, the term “U.S. holder” means a beneficial owner of a common share or ADS that, for U.S. federal income tax
purposes, is:

·         an individual who is a citizen or resident of the United States;

·         a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws

of the United States, any state thereof or the District of Columbia;

·         an estate the income of which is subject to U.S. federal income taxation regardless of its source; or

·                 a  trust  if  it  (1)  is  subject  to  the  primary  supervision  of  a  court  within  the  United  States  and  one  or  more  U.S.  persons  have  the
authority to control all substantial decisions of the trust or (2) has a valid election in effect under applicable U.S. Treasury Department
regulations to be treated as a U.S. person.

If  a  partnership  (or  other  entity  treated  as  a  partnership  for  U.S.  federal  income  tax  purposes)  holds  common  shares  or  ADSs,  the  tax
treatment of a partner will generally depend upon the status of the partner and the activities of the partnership.  A U.S. holder that is a partner
of a partnership holding common shares or ADSs should consult its tax advisors.

Except where noted, this discussion deals only with common shares or ADSs held as capital assets within the meaning of Section 1221 of
the Internal Revenue Code of 1986, as amended, or the Code, and does not deal with U.S. holders that may be subject to special U.S. federal
income tax rules, such as dealers in securities or currencies, traders in securities that elect to use a mark‑to‑market method of accounting for
their  securities  holdings,  banks  or  other  financial  institutions,  tax‑exempt  organizations,  insurance  companies,  real  estate  investment  trusts,
regulated  investment  companies,  persons  holding  common  shares  or  ADSs  as  part  of  a  hedging,  integrated,  conversion  or  constructive  sale
transaction  or  a  straddle,  persons  liable  for  alternative  minimum  tax,  pass‑through  entities  and  investors  in  a  pass‑through  entity,  persons
owning 10% or more of our voting stock, or persons whose “functional currency” is not the U.S. dollar.

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This discussion is based upon the provisions of the Code, and existing and proposed U.S. Treasury Department regulations, administrative
pronouncements of the Internal Revenue Service, or the IRS, and judicial decisions as of the date hereof.  Such authorities may be repealed,
revoked or modified so as to result in U.S. federal income tax consequences different from those discussed below, possibly with retroactive
effect.    In  addition,  this  discussion  is    based,  in  part,  upon  representations  made  by  the  Depositary  to  us  and  assumes  that  the  deposit
agreement, and all other related agreements, will be performed in accordance with their terms.

Except  as  specifically  described  below,  this  discussion  assumes  that  we  are  not  a  passive  foreign  investment  company,  or  PFIC,  for
U.S.  federal  income  tax  purposes.    Please  see  the  discussion  under  “—Passive  Foreign  Investment  Company  Rules”  below.    Further,  this
discussion does not address the U.S. federal estate and gift, alternative minimum tax, Medicare tax on net investment income, state, local or
non‑U.S. tax consequences of acquiring, holding or disposing of common shares or ADSs.

ADSs

In general, for U.S. federal income tax purposes, U.S. holders of ADSs will be treated as the owners of the underlying common shares that
are  represented  by  such  ADSs.    Deposits  or  withdrawals  of  common  shares  by  U.S.  holders  for  ADSs  will  not  be  subject  to  U.S.  federal
income tax.  However, the U.S. Treasury Department has expressed concerns that parties involved in transactions wherein depositary shares
are pre‑released may be taking actions that are inconsistent with the claiming of foreign tax credits by the holders of ADSs.  Accordingly, the
analysis  of  the  creditability  of  Brazilian  income  taxes  described  herein  could  be  affected  by  future  actions  that  may  be  taken  by  the
U.S. Treasury Department.

Taxation of Dividends

The gross amount of distributions paid to a U.S. holder (including Brazilian taxes that are withheld, if any, and any payments of interest on
shareholders’ equity, as described above under “—Brazilian Tax Considerations”) will be treated as dividend income to the extent paid out of
our  current  or  accumulated  earnings  and  profits,  as  determined  under  U.S.  federal  income  tax  principles.    Such  income  generally  will  be
includable  in  a  U.S.  holder’s  gross  income  as  ordinary  income  when  actually  or  constructively  received  by  the  U.S.  holder,  in  the  case  of
common shares, or when actually or constructively received by the Depositary, in the case of ADSs.  Such dividends will not be eligible for the
dividends received deduction allowed to corporations under the Code.  To the extent that the amount of any distribution exceeds our current
and accumulated earnings and profits for a taxable year, the distribution will first be treated as a tax‑free return of capital to the extent of the
U.S.  holder’s  adjusted  tax  basis  in  the  common  shares  or  ADS,  causing  a  reduction  in  such  adjusted  tax  basis  (and  thereby  increasing  the
amount of gain, or decreasing the amount of loss, to be recognized on a subsequent disposition of our common shares or ADSs), and thereafter
as capital gain recognized on a sale or exchange.  Because we do not expect to maintain calculations of earnings and profits in accordance with
U.S. federal income tax principles, U.S. holders should expect that a distribution will generally be treated as a dividend for U.S. federal income
tax  purposes.    Distributions  of  additional  common  shares  or  ADSs  to  U.S.  holders  that  are  part  of  a  pro  rata  distribution  to  all  of  our
shareholders generally will not be subject to U.S. federal income tax.

The amount of any dividend paid in reais will equal the U.S. dollar value of the reais received calculated by reference to the exchange rate
in effect on the date the dividend is received by the U.S. holder, in the case of common shares, or by the Depositary, in the case of ADSs,
regardless of whether the reais are converted into U.S. dollars.  If the reais received as a dividend are not converted into U.S. dollars on the
date of receipt, the U.S. holder will have a tax basis in the reais equal to their U.S. dollar value on the date of receipt.  Any gain or loss realized
on a subsequent conversion or other disposition of the reaiswill be foreign currency gain or loss that is treated as U.S. source ordinary income
or loss.  If dividends paid in reaisare converted into U.S. dollars on the day they are received by the U.S. holder or the Depositary, as the case
may  be,  U.S.  holders  generally  should  not  be  required  to  recognize  foreign  currency  gain  or  loss  in  respect  of  the  dividend  income. 
U.S.  holders  should  consult  their  own  tax  advisors  regarding  the  treatment  of  any  foreign  currency  gain  or  loss  if  any  reaisreceived  by  the
U.S. holder or the Depositary or its agent are not converted into U.S. dollars on the date of receipt.

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Certain dividends received by certain non‑corporate U.S. holders may be eligible for preferential tax rates so long as (1) specified holding
period  requirements  are  met,  (2)  the  U.S.  holder  is  not  under  an  obligation  (whether  pursuant  to  a  short  sale  or  otherwise)  to  make  related
payments  with  respect  to  positions  in  substantially  similar  or  related  property,  (3)  the  company  paying  the  dividend  is  a  “qualified  foreign
corporation” and (4) the company is not a PFIC for U.S. federal income tax purposes in the year of distribution or the prior year.  We do not
believe that we were classified as a PFIC for our prior taxable year nor do we expect to be classified as a PFIC for the current taxable year.  We
generally will be treated as a qualified foreign corporation with respect to our ADSs so long as the  ADSs remain listed on the NYSE.  Based
on  existing  guidance,  however,  it  is  not  entirely  clear  whether  dividends  received  with  respect  to  the  common  shares  (to  the  extent  not
represented  by  ADSs)  will  be  eligible  for  this  treatment,  because  the  common  shares  are  not  themselves  listed  on  a  U.S.  exchange. 
U.S.  holders  should  consult  their  own  tax  advisors  about  the  application  of  this  preferential  tax  rate  to  dividends  paid  directly  on  common
shares.

Subject to certain complex limitations and conditions (including a minimum holding period requirement), Brazilian income taxes withheld
on  dividends,  if  any,  may  be  treated  as  foreign  income  taxes  eligible  for  credit  against  a  U.S.  holder’s  U.S.  federal  income  tax  liability. 
Alternatively, if a U.S. holder does not elect to claim a foreign income tax credit for any foreign taxes paid during the taxable year, all foreign
income taxes paid may instead be deducted in computing such U.S. holder’s taxable income.  For purposes of calculating the foreign tax credit,
dividends paid on our common shares will be treated as income from sources outside the United States.  For the purposes of the U.S. foreign
tax  credit  limitations,  the  dividends  paid  by  us  should  generally  constitute  “passive  category  income”  for  most  U.S.  holders.    The  rules
governing the foreign tax credit are complex.  U.S. holders should consult their tax advisors regarding the availability of the foreign tax credit
under their particular circumstances.

Taxation of Capital Gains

For U.S. federal income tax purposes, a U.S. holder generally will recognize taxable gain or loss on any sale, exchange or other taxable
disposition  of  a  common  share  or  ADS  in  an  amount  equal  to  the  difference  between  the  U.S.  dollar  value  of  the  amount  realized  for  the
common share or ADS and the U.S. holder’s adjusted tax basis in the common share or ADS, determined in U.S. dollars.  Such gain or loss
will generally be capital gain or loss.  The capital gain or loss will be long‑term capital gain or loss if at the time of sale, exchange or other
taxable disposition the U.S. holder has held our common shares or ADSs for more than one year.  Capital gains of individuals derived with
respect to capital assets held for more than one year are eligible for reduced rates of taxation.  The deductibility of capital losses is subject to
limitations.  Any gain or loss recognized by a U.S. holder will generally be treated as U.S. source gain or loss.  Consequently, a U.S. holder
may not be able to use the foreign tax credit arising from Brazilian income tax imposed, if any, on the disposition of a common share or ADS
unless such credit can be applied (subject to applicable limitations) against U.S. federal income tax due on other income treated as derived
from foreign sources.

Passive Foreign Investment Company Rules

Based upon our current and projected income, assets, activities and business plans, we do not expect the common shares or ADSs to be
considered shares of a PFIC for our current fiscal year (although the determination cannot be made until the end of such fiscal year), and we
intend  to  continue  our  operations  in  such  a  manner  that  we  do  not  expect  to  be  classified  as  a  PFIC  in  the  foreseeable  future.    However,
because  the  determination  of  whether  the  common  shares  or  ADSs  constitute  shares  of  a  PFIC  will  be  based  upon  the  composition  of  our
income, assets and the nature of our business, as well as the income, assets and business of entities in which we hold at least a 25% interest,
from time to time, and because there are uncertainties in the application of the relevant rules, there can be no assurance that the common shares
or ADSs will not be considered shares of a PFIC for any fiscal year.  If the common shares or ADSs were shares of a PFIC for any fiscal year,
U.S.  holders  (including  certain  indirect  U.S.  holders)  may  be  subject  to  adverse  tax  consequences,  including  the  possible  imposition  of  an
interest charge on gains or “excess distributions” allocable to prior years in the U.S. holder’s holding period during which we were determined
to be a PFIC.  If we are deemed to be a PFIC for a taxable year, dividends on our ADSs would not be qualified dividend income eligible for
preferential rates of U.S. federal income taxation.  In addition, a U.S. holder that owns common shares or ADSs during any taxable year that
we  are  treated  as  a  PFIC  would  generally  be  required  to  file  IRS  form  8621,  including  in  order  to  comply  with  additional  annual  filing
requirements imposed under legislation enacted in 2010.  U.S. holders should consult their own tax advisors regarding the application of the
PFIC rules (including any information reporting requirements in connection therewith) to the common shares or ADSs. 

Information Reporting and Backup Withholding

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In general, information reporting requirements will apply to dividends in respect of our common shares or ADSs or the proceeds received
on the sale, exchange, or redemption of our ADSs, in each case to the extent treated as being paid within the United States (and in certain
cases, outside of the United States) to a U.S. holder unless a U.S. holder establishes its status as an exempt recipient, and backup withholding
(currently at a rate of 28 percent) may apply to such amounts if the U.S. holder does not establish its status as an exempt recipient or fails to
provide a correct taxpayer identification number and certify that such U.S. holder is not subject to backup withholding.  The amount of any
backup withholding from a payment to a U.S. holder will be allowed as a refund or credit against such U.S. holder’s U.S. federal income tax
liability provided the U.S. holder timely furnishes the required information to the IRS.

In  addition,  U.S.  holders  should  be  aware  that  additional  reporting  requirements  apply  with  respect  to  the  holding  of  certain  foreign
financial assets, including stock of foreign issuers which is not held in an account maintained by a financial institution, if the aggregate value
of  all  of  such  assets  exceeds  US$50,000.    U.S.  holders  should  consult  their  own  tax  advisors  regarding  the  application  of  the  information
reporting rules to our common shares and ADSs and the application of these additional reporting requirements for foreign financial assets to
their particular situation.

F.       Dividends and Payments Agents

Not applicable.

G.      Statements by Experts

Not applicable.

H.      Documents on Display

We are subject to the periodic reporting and other informational requirements of the U.S. Securities Exchange Act of 1934, as amended
and supplemented, or the Exchange Act.  Accordingly, we are required to file reports and other information with the SEC.  You may inspect
and copy reports and other information filed by us at the public reference facilities maintained by the SEC at 100 F Street, N.W., Washington
D.C.  20549.    Our  filings  will  also  be  available  at  the  SEC’s  website  at  http://www.sec.gov.  Reports  and  other  information  may  also  be
inspected and copied at the offices of the NYSE at 20 Broad Street, New York, New York 10005.

Our website is located at http://www.sabesp.com.br and our investor relations website is located at http://www.sabesp.com.br/investors. 
(These  URLs  are  intended  to  be  an  inactive  textual  reference  only.    They  are  not  intended  to  be  an  active  hyperlink  to  our  website.    The
information  on  our  website,  which  might  be  accessible  through  a  hyperlink  resulting  from  this  URL  is  not,  and  shall  not  be  deemed  to  be,
incorporated into this annual report.)

We also furnish to the depositary annual reports in English including audited annual financial statements and reviewed quarterly financial
statements in English for each of the first three quarters of the fiscal year.  We also furnish to the depositary English translations or summaries
of all notices of shareholders’ meetings and other reports and communications that are made generally available to holders of common shares.

I.        Subsidiary Information

Not applicable.

ITEM 11.         QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk

We are exposed to various market risks, in particular, foreign currency risk and interest rate risk.  We are exposed to foreign currency risk
because a substantial portion of our financial indebtedness is denominated in foreign currencies, primarily the U.S. dollar, while we generate
all of our net operating revenues in reais.  Similarly, we are subject to interest rate risk based upon changes in interest rates, which affect our
net financial expenses.  For further information on our market risks, see Note 5 to our financial statements included in this annual report.

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Exchange Rate Risk

As of December 31, 2017 and 2016, R$5,672.8 million and R$5,660.4 million, or 46.9% and 47.3%, respectively, of our debt obligations
were denominated in foreign currencies.  As a result, we are exposed to exchange rate risks that may adversely affect our financial condition
and results of operations, as well as our ability to meet debt service obligations.

Exchange Rate Sensitivity

We  estimate  that  the  potential  loss  to  us  in  connection  with  U.S.  dollar  and  yen-denominated  debt  that  would  have  resulted  as  of
December 31, 2017, 2016 and 2015 from each hypothetical instantaneous and unfavorable 1% change in the U.S. dollar and yen against the
real  would  have  been  approximately  R$56.7 million,  R$56.6  million  and  R$66.2  million,  respectively.    Consistent  with  these  estimates,  a
hypothetical instantaneous and unfavorable 10% change in this exchange rate would have resulted in losses of approximately R$567.3 million,
R$566.0 million and R$661.8 million as of December 31, 2017, 2016 and 2015, respectively.

The fluctuation of the real in relation to the U.S. dollar and yen for the years ended December 31, 2017, 2016 and 2015 were as follows:

2017

1.5

5.4

Year ended December 31,

2016

(in percentages)

2015

(16.5)

(13.8)

47.0

46.0

Depreciation

(appreciation) of
the real in relation
to the U.S. dollar

Depreciation

(appreciation) of
the real in relation
to the yen

We have not contracted derivative financial instruments in the years ended December 31, 2017, 2016 and 2015.

For further information regarding foreign currency risk, see Note 5.1(a) to our 2017 financial statements included in this annual report.

As of December 31, 2017, 2016 and 2015, we had no short‑term indebtedness outstanding, other than the current portion of long‑term

debt.

Interest Rate Risk

As  of  December  31,  2017  and  2016,  R$1,579.7  million,  or  13.1%,  and  R$1,541.3  million,  or  12.9%,  respectively,  of  our  total  debt
outstanding balance denominated in reais was based on variable rates of interest based on the UPR, which is equivalent to the TR.  In addition,
as of December 31, 2017 and 2016, R$1,149.2 million, or 9.5%, and R$1,104.3 million, or 9.2%, respectively, of our total debt denominated in
reais  was  subject  to  interest  rates  based  on  the  CDI.    As  of  December  31,  2017  and  2016,  R$2,317.0  million  and  R$2,416.6  million,
respectively, of our foreign-currency denominated debt was based on the IADB and the IBRD variable rates of interest, which are determined
based on the cost of funding of these multilateral organizations in each period.

As of December 31, 2017 and 2016, we did not have any derivative contracts outstanding which limited exposure to changes in the UPR
or  the  CDI  or  in  the  IADB  or  IBRD  variable  rates. However,  we  are  obliged  by  law  to  invest  our  excess  cash  with  financial  institutions
controlled  by  the  Brazilian  government.    We  invest  these  excess  funds,  which  totaled  R$2,283.0  million  and  R$1,886.2  million  as  of
December  31,  2017  and  2016,  respectively,  mainly  in  short-term  instruments.    As  a  result,  our  exposure  to  Brazilian  interest  rate  risk  is
partially  limited  by  our  real-denominated  floating  interest  time  deposits  investments,  which  generally  earn  interest  based  on  the  CDI.    In
addition to our exposure with respect to existing indebtedness, we may become exposed to interest rate volatility with respect to indebtedness
incurred in the future.

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We  estimate  that  we  would  have  suffered  a  loss  over  periods  of  one  year,  respectively,  of  up  to  R$121.0 million,  R$119.6  million  and
R$131.2  million  if  a  hypothetical  instantaneous  and  unfavorable  change  of  100  basis  points  in  the  interest  rates  applicable  to  financial
liabilities as of December 31, 2017, 2016 and 2015, respectively, had occurred.  Consistent with these estimates, a hypothetical instantaneous
and unfavorable 1000 basis points change in these interest rates would have resulted in losses of approximately R$1,210.1 million, R$1,196.4
million and R$1,312.2 million as of December 31, 2017, 2016 and 2015, respectively.  This sensitivity analysis is based on the assumption of
an unfavorable 100 basis point movement of the interest rates applicable to each homogeneous category of financial liabilities and sustained
over  a  period  of  one  year,  as  applicable,  and  that  such  movement  may  or  may  not  affect  interest  rates  applicable  to  any  other  homogenous
category of financial liabilities.

A homogeneous category is defined according to the currency in which financial liabilities are denominated and assumes the same interest
rate movement within each homogeneous category (i.e., U.S. dollars).  As a result, our interest rate risk sensitivity model may overstate the
effect of interest rate fluctuation on these financial instruments, as consistently unfavorable movements of all interest rates are unlikely.

The tables below provide information about our interest rate-sensitive instruments.  For variable interest rate debt, the rate presented is the
weighted  average  rate  calculated  as  of  December  31,  2017.    For  the  foreign  currency  denominated  obligations,  these  amounts  have  been
converted  at  the  selling  rates  as  of  December  31,  2017  and  do  not  represent  amounts  which  may  actually  be  payable  with  respect  to  such
obligations on the dates indicated.

Assets

Cash equivalents denominated in reais

Liabilities
Long‑term debt (current and noncurrent portion)

Floating rate, denominated in reais indexed by TR or UPR

Floating rate, denominated in reais indexed by TJLP

Floating rate, denominated in reais indexed by IPCA

Floating rate, denominated in reais indexed by CDI

Fixed rate, denominated in reais

Floating rate, denominated in U.S. dollars

Fixed rate, denominated in Yen

Fixed rate, denominated in U.S. dollars
Total long‑term debt

2018

2019

As of December 31, 2017
Expected maturity date

  2021 and after  
(in millions, except percentages)

2020

Total

  Average annual
interest rate

-

-  

-  

- 

-  

130.4  
178.6 
470.1  
402.7 
17.6  
466.4 
77.7  
3.3 
1,746.8  

115.0  
         183.0 
660.8  
246.9 
32.7  
426.7 
114.2  
 -   
1,779.3  

117.4  
162.6 
314.4  
149.8 
34.4  
194.4 
114.2  
1,155.3 
2,242.5  

1,216.9                  1,579.7  
837.8                 1,362.0 
330.3                  1,775.6  
349.8                 1,149.2 
476.9                      561.6  
1,726.3                 2,813.8 
1,394.4                  1,700.5  
-                   1,158.6 
6,332.4                12,101.0  

8.5%

8.7%

8.8%

9.1%

3.6%

1.5%

3.3%

6.0%

UPR stands for Standard Reference Unit (Unidade Padrão Referência) and is equal to TR, which  was 0.00% per month as of December 31, 2017; CDI stands for Interbank
Deposit Rate (Certificado de Depósitos Interbancários), which was 6.89% per annum as of December 31, 2017; IGP‑M was -0.52% per annum as of December 31, 2017;
TJLP stands for Long‑term Interest Rate (Taxa de Juros a Longo Prazo), published quarterly by the Central Bank, which was 7% per annum as of December 31, 2017.

The percentage of our indebtedness subject to fixed and floating interest rate is as follows:

Floating rate debt:

Denominated in U.S. dollars

Denominated in reais

Fixed rate debt:

Denominated in reais

Denominated in Yen

Denominated in U.S. dollars

Total 

2017

23.3%

48.5%

4.6%

14.1%

9.5%

100.0%

As of December 31,

2016

2015

24.3%

48.1%

4.6%

13.5%

9.5%

100.0%

22.3%

45.5%

4.1%

13.4%

14.7%

100.0%

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ITEM 12.         DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES

A.      Debt Securities

Not applicable.

B.      Warrants and Rights

Not applicable.

C.      Other Securities

Not applicable.

D.      American Depositary Shares

In the United States, our common shares trade in the form of ADS.  Following a ratio change effected on January 24, 2013, each ADS
represents one common share of our company.  Following a stock split which took place on April 25, 2013, we issued two new ADSs for each
ADS  currently  trading  and  distributed  them  to  our  holders  on  April  29,  2013.  The  ADSs  are  issued  by  The  Bank  of  New  York  Mellon,  as
Depositary pursuant to a Deposit Agreement.  The ADSs commenced trading on the NYSE on May 10, 2002.

Fees and Expenses

The following table summarizes the fees and expenses payable by holders of ADRs:

Persons depositing common shares or ADR holders must pay:
US$5.00 (or less) per 100 ADSs (or portion of 100 ADSs)

For:
Issuance of ADSs, including issuances resulting from a distribution of
common shares or rights or other property

Cancellation of ADSs for the purpose of withdrawal, including if the deposit
agreement terminates
US$0.05 (or less) per ADS or portion thereof (to the extent not prohibited
by the rules of any stock exchange on which the ADSs are listed for trading)
A fee equivalent to the fee that would be payable if securities distributed to
you had been common shares and the common shares had been deposited
for issuance of ADSs
US$0.05 (or less) per ADS or portion thereof per calendar year (in addition
to the cash distribution fee of $0.02 per ADS that the depositary has
collected during the year)
Registration or transfer fees

Cable, telex and facsimile transmissions expenses (when expressly provided
in the deposit agreement)
Expenses of the depositary in converting foreign currency to U.S. dollars
Expenses of the depositary

Taxes and other governmental charges the depositary or the custodian have
to pay on any ADR or common share underlying an ADR, for example,
stock transfer taxes, stamp duty or withholding taxes
Any charges incurred by the depositary or its agents for servicing the
deposited securities

Payment of Taxes

Any cash distribution to you

Distribution of securities distributed to holders of deposited securities which
are distributed by the depositary to ADR holders

Depositary services

Transfer and registration of common shares on our common share register
to or from the name of the depositary or its agent when you deposit or
withdraw common shares

As necessary

No charges of this type are currently made in the Brazilian market

The depositary may deduct the amount of any taxes owed from any payments to you.  It may also sell deposited securities, by public or
private sale, to pay any taxes owed.  You will remain liable if the proceeds of the sale are not sufficient to pay the taxes.  If the depositary sells
deposited securities, it will, if appropriate, reduce the number of ADSs  to  reflect  the  sale  and  pay  to  you  any  proceeds,  or  send  to  you  any
property, remaining after it has paid the taxes.

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Reimbursement of Fees

The  Bank  of  New  York  Mellon,  as  depositary,  has  agreed  to  reimburse  us  for  expenses  we  incur  that  are  related  to  establishment  and
maintenance expenses of the ADS program.  The depositary has agreed to reimburse us for our continuing annual stock exchange listing fees. 
The depositary has also agreed to pay the standard out‑of‑pocket maintenance costs for the ADRs, which consist of the expenses of postage
and  envelopes  for  mailing  annual  and  interim  financial  reports,  printing  and  distributing  dividend  checks,  electronic  filing  of  United  States
federal  tax  information,  mailing  required  tax  forms,  stationery,  postage,  facsimile,  and  telephone  calls.    It  has  also  agreed  to  reimburse  us
annually for certain investor relationship programs or special investor relations promotional activities.  In certain instances, the depositary has
agreed to provide additional payments to us based on any applicable performance indicators relating to the ADR facility.  There are limits on
the amount of expenses for which the depositary will reimburse us, but the amount of reimbursement available to us is not necessarily tied to
the amount of fees the depositary collects from investors.

The depositary collects its fees for delivery and surrender of ADSs directly from investors depositing shares or surrendering ADSs for the
purpose of withdrawal or from intermediaries acting for them.  The depositary collects fees for making distributions to investors by deducting
those fees from the amounts distributed or by selling a portion of distributable property to pay the fees.  The depositary may collect its annual
fee for depositary services by deduction from cash distributions or by directly billing investors or by charging the book‑entry system accounts
of participants acting for them.  The depositary may generally refuse to provide fee‑attracting services until its fees for those services are paid.

Reimbursement of Fees Incurred in 2017

From January 1, 2017 to December 31, 2017, we received reimbursements in the amount of US$3.4 million for  standard  out‑of‑pocket

maintenance costs for the ADRs, any applicable performance indicators relating to the ADR facility, marketing fees and legal fees.

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 PART II  

ITEM 13.         DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES

Not applicable.

ITEM 14.         MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS

Not applicable.

ITEM 15.         CONTROLS AND PROCEDURES

A.      Disclosure Controls and Procedures

We carried out an evaluation under the supervision of and with the participation of our management, including our Chief Executive
Officer and Chief Financial Officer and Investor Relations Officer, of the effectiveness of the design and operation of our disclosure controls
and procedures, including those defined in the United States Exchange Act Rule 13a‑15(e), as of the year ended December 31, 2017.

As a result of this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and
procedures were both designed and effective at the reasonable assurance level as of December 31, 2017, that the information required to be
disclosed in our filings and submissions under the Exchange Act is recorded, processed, summarized, and reported within the time periods
specified by the SEC’s rules and forms, and that this information is accumulated and communicated to our management, including our Chief
Executive Officer and Chief  Financial Officer and Investor Relations Officer, as appropriate to allow timely decisions regarding required
disclosure.

B.      Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal controls over financial reporting.

Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial
reporting  and  the  preparation  of  financial  statements  for  external  purposes  in  accordance  with  IFRS,  as  issued  by  the  IASB.    Our  internal
control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail,
accurately and fairly reflect the transactions and dispositions of our assets, (2) provide reasonable assurance that transactions are recorded as
necessary to permit preparation of financial statements in accordance with IFRS, as issued by the IASB, and that our receipts and expenditures
are  being  made  only  in  accordance  with  authorizations  of  our  management  and  directors,  and  (3)  provide  reasonable  assurance  regarding
prevention or timely detection of unauthorized acquisition, use, or disposition of our assets that could have a material effect on the financial
statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements.  Also, projections of
any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions,
or that the degree of compliance with the policies or procedures may deteriorate.

Under the supervision and with the participation of our CEO and CFO, our management conducted an assessment of our internal control
over financial reporting as of December 31, 2017 based on the criteria established in “Internal Control —Integrated Framework” issued by
COSO in 2013.

                As a result of the assessment described above, our management concluded that as of December 31, 2017, we maintained effective
internal control over financial reporting based on the criteria established in “Internal Control — Integrated Framework” issued by COSO in
2013.

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Our  independent  registered  public  accounting  firm  has  issued  an  attestation  report  on  the  effectiveness  of  our  internal  control  over

financial reporting.  That report is included below.

C.      Attestation Report of the Registered Public Accounting Firm

The opinion by our independent registered public accounting firm on the effectiveness of our internal control over financial reporting is

included in the report of KPMG Auditores Independentes that is included in this annual report on page F-2.

D.      Changes in internal control over financial reporting

As  a  result  of  the  implementation  of  our  ERP  system  in  April  2017,  we  made  certain  changes  to  our  internal  control  over  financial
reporting processes during the fiscal year ended December 31, 2017. Based on our analysis of our internal controls over financial reporting, we
concluded  that  none  of  these  changes  materially  affect,  or  are  reasonably  likely  to  materially  affect,  our  internal  control  over  financial
reporting.

ITEM 16.   [RESERVED]          

ITEM 16A.      AUDIT COMMITTEE FINANCIAL EXPERT

At our board meeting held on June 26, 2006, we established an audit committee, as defined under section 3(a)(58) of the Exchange Act. 
Our board of directors has determined that Jerônimo Antunes qualifies as an “audit committee financial expert” as defined for the purposes of
this Item 16A in Item 16 of Form 20‑F.  Jerônimo Antunes is an “independent director” within the meaning of the SEC rules.

ITEM 16B.      CODE OF ETHICS

We  have  adopted  a  code  of  business  conduct  and  ethics,  as  defined  in  Item  16B  of  Form  20‑F  under  the  Exchange  Act.    Our  code  of
business  conduct  and  ethics,  called  Code  of  Ethics  and  Conduct,  applies  to  all  of  our  employees,  including  our  directors,  chief  executive
officer, chief financial officer and investor relations and head of accounting, as well as our suppliers and third‑party contractors.  To ensure
compliance  with  the  Code  of  Ethics  and  Conduct,  we  have  an  Ethics  Committee  and  an  internal  Whistle-Blower  Channel,  as  well  as  a
Corporate Accountability Procedure and an Ombudsman Office as well as a Customer Service that receive external complaints.  The internal
channel can receive anonymous whistle blowing.  The results of the investigations are forwarded to the Audit Committee.  Cases of recurrence
are reported to the Ethics Committee, which urges the related departments to develop preventive actions.  In 2017, 144 events were reported to
the Whistle-Blower Channel, 71% of which were verified and 29% are under investigation.  Out of the total, 5% refer to misconduct, such as
moral  harassment,  discrimination,  persecution  and  unfair  treatment.    During  2017,  43  of  our  employees  or  outsourced  employees  received
penalties (18 warnings, seven suspensions and 18 dismissals).  Our Ethics Committee is also responsible for addressing relevant inquiries and
interpreting  the  norms  of  the  Code  of  Ethics  for  all  of  our  employees.    Our  Code  of  Ethics  and  Conduct  is  available  on  our  web  site  at
http://www.sabesp.com.br at the following location: Investor Relations – Corporate Governance.  If we amend the provisions of our Code of
Ethics  and  Conduct,  or  if  we  grant  any  waiver  of  such  provisions,  we  will  disclose  the  amendment  or  waiver  on  our  web  site  at  the  same
address.  You can obtain copies of our Code of Ethics and Conduct, without charge, upon request to sabesp.ri@sabesp.com.br.

Federal  Law  No.  13,303/16,  State  Decree  62,349/16  and  the  new  Novo  Mercado  rules  require  the  adoption  of  a  Code  of  Conduct  and
Integrity that should include, among other provisions, guidelines to avoid conflicts of interests, forbiddance of fraudulent acts and corruption,
whistleblowing channels, protective measures to avoid retaliation regarding whistleblowers, periodic training on the content of such code and
sanctions in case of code violations. We intend to amend our code of ethics and conduct to meet the new requirements by the June 30 2018
deadline. See “Item 16G—Corporate Governance—Required Changes to Corporate Governance Practices of Brazilian Government-Controlled
Companies”.  We will disclose the amendment on our web site at the address listed above.

ITEM 16C.      PRINCIPAL ACCOUNTANT FEES AND SERVICES

KPMG  Auditores  Independentes  served  as  our  independent  registered  public  accounting  firm  for  the  year  ended  December  31,  2017. 

KPMG Auditores Independentes’ activity began with the review of our interim financial information reporting for the second quarter of 2016.

Deloitte  Touche  Tohmatsu  Auditores  Independentes  served  as  our  independent  registered  public  accounting  firm  for  the  years  ended

December 31, 2015, 2014, 2013, and 2012.

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The  following  table  presents  the  aggregate  fees  for  professional  services  and  other  services  rendered  to  us  by  KPMG  Auditores

Independentes and Deloitte Touche Tohmatsu Auditores Independentes in 2017 and 2016:

Audit Fees(1)
Audit‑Related Fees
Tax Fees
All Other Fees(2)
Total

Year ended December 31,

(in millions of reais)

2017

3.0
-

-
0.0
3.0

2016

1.9
-

-
-
1.9

(1)         Audit  Fees  are  the  fees  billed  by  our  independent  auditors  for  the  audit  of  our  annual  financial  statements,  reviews  of  interim  financial  statements  and  attestation

services that are provided in connection with statutory and regulatory filings or engagements.

(2)     Includes the amount of R$0.04 million referring to non-material, non-audit services.

Pre‑approval policies and procedures

Pursuant  to  Brazilian  law,  our  board  of  directors  is  responsible,  among  other  matters,  for  the  selection,  dismissal  and  oversight  of  our
independent  registered  public  accounting  firm.    Our  management  is  required  to  obtain  the  board  of  directors’  approval  before  engaging  an
independent  registered  public  accounting  firm  to  provide  any  audit  or  permitted  non‑audit  services  to  us.    The  Brazilian  Federal  and  State
Public Bidding Laws also apply to us with respect to obtaining services from third parties for our business, including the services provided by
our  independent  registered  public  accounting  firm.    As  part  of  the  bidding  process,  the  independent  registered  public  accounting  firm  is
required to submit proposals, and is then selected by us based on certain criteria including technical expertise and cost.

Except as disclosed above, KPMG Auditores Independentes did not provide any non-audit services to us in 2016 or 2017. Deloitte Touche

Tohmatsu Auditores Independentes did not provide any non-audit services to us in 2016 or 2015.

ITEM 16D.      EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES

None

ITEM 16E.      PURCHASES OF EQUITY SECURITIES BY ISSUER AND AFFILIATED PURCHASERS

Not applicable.

ITEM 16F.       CHANGE IN REGISTRANT'S CERTIFYING ACCOUNTANT

As  previously  disclosed  in  our  annual  report  on  Form  20-F  for  the  fiscal  year  ended  December  31,  2016,  Deloitte  Touche  Tohmatsu
Auditores Independentes was appointed to act as our independent public accounting firm to audit our financial statements for the years ended
December 31, 2015, 2014, 2013, and 2012.  On June 22, 2016, we engaged KPMG Auditores Independentes as our new independent registered
public accounting firm to audit our financial statements.  The decision to engage KPMG Auditores Independentes was approved by our board
of  directors  at  a  meeting  on  June  16,  2016.  KPMG  Auditores  Independentes’  activity  began  with  the  review  of  our  interim  financial
information reporting for the second quarter of 2016.

ITEM 16G.      CORPORATE GOVERNANCE

Required Changes to Corporate Governance Practices of Brazilian Government-Controlled Companies

On June 30, 2016, Federal Law No. 13,303/16 came into force in Brazil.  This law sets new corporate governance standards for Brazilian
government-owned and mixed capital companies like our company, as well as their subsidiaries.  Federal Law No. 13,303/16 also sets new
rules that these companies must follow in public bidding procedures and when contracting third parties.

Although the federal law gave the companies concerned two years in which to comply with the new standards, the State of São Paulo
decided that companies controlled by the State, like our company, had to revise their bylaws to bring them into compliance by the end of 2017.
However, taking into account State Law No. 16,525, of September 15, 2017, which regulates our corporate reorganization and the new Novo
Mercado requirements, the State of São Paulo enacted Decree No. 63,089/2017, which allows us to implement the necessary changes to our
bylaws by June 30, 2018, as required by Federal Law No. 13,303/16.

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In terms of corporate governance, Federal Law No. 13,303/16 requires significant changes to internal controls and strengthens the rights
not only of our shareholders, but also of any interested party, to inspect the finances and running of the company.  It requires us to publish
periodically a series of documents and reports to demonstrate our level of commitment to our business objectives, the financial impact of those
commitments, and our policies and practices in terms of corporate governance and sustainability, among other things.  Those documents and
reports must be accompanied by further explanations, in plain language, that can be understood by the general public.

Among other requirements, this law sets out the following rules:

·                  At  least  25%  of  the  members  of  the  Board  of  Directors  must  be  independent,  in  accordance  with  the  definition  of  director
independence  set  by  Brazilian  law  (or,  for  companies  whose  minority  shareholders  exercise  multiple  votes,  at  least  one  of  the
directors must be independent).

·         All directors and officers must have the same term of office, which may not be longer than two years.  They may be re-elected up to a

maximum of three times consecutively.

·         The performance of the executive officers, directors and members of board committees must be subjected to yearly evaluation with

respect to, at a minimum, the following matters:

a.       the lawfulness and effectiveness of their management performance;

b.      their contribution to the company’s income for the year; and

c.       their contribution to furthering the objectives in the company’s business plan and compliance with its long-term strategy.

The federal law requires that all officers and directors of the company must satisfy certain technical standards, in addition to the general
requirement  that  they  be  of  good  reputation  and  have  knowledge  of  the  business  sector  concerned.    These  technical  standards  include
satisfying both Point 1 and Point 2 below:

1.       The individual must satisfy at least one of the requirements under (a), (b) or (c) of this Point 1:

a.                 a minimum of 10 years’ experience in an appointed position, in either the public or private sector, in a business area that is

similar or related to the company’s business purpose; or

b.        a minimum of four years’ exercise of any one of (i), (ii) or (iii) below:

                                            i.            a senior management position in a company with a similar business purpose or similar size; or

                                           ii.            a position in the public sector that involves a high degree of trust (i.e., at level DAS-4 or higher); or

                                         iii.            a position as professor or researcher in the company’s business sectors; or

c.         a minimum of four years’ practice as an independent professional in one or more areas that are directly or indirectly related to

the company’s business sectors;

and:

2.       The individual must satisfy the requirements of both (a) and (b) of this Point 2:

a.        the individual must have received sufficient training for the position for which she or he has been nominated; and

b.       the individual must not have been declared ineligible for such position in accordance with applicable law.

In order to comply with this law we have implemented certain changes in our corporate governance structure and governing documents,
such as our bylaws. We believe that we will have completed the implementation of such changes by the June 30, 2018, as required by Federal
Law No. 13,303/16.

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For a description of new corporate governance obligations imposed by Brazilian law on companies listed on the Novo Mercado segment,

see “Item 9.C. Markets—Trading on the Brazilian Stock Exchange—The Novo Mercado Segment.”

Significant Differences between our Current Corporate Governance Practices and NYSE Corporate Governance Standards

We  are  subject  to  the  NYSE  corporate  governance  listing  standards.    As  a  foreign  private  issuer,  the  standards  applicable  to  us  are
considerably different than the standards applied to U.S. listed companies.  Under the NYSE rules, we are required only to: (a) have an audit
committee  or  audit  board,  pursuant  to  an  applicable  exemption  available  to  foreign  private  issuers,  that  meets  certain  requirements,  as
discussed below, (b) provide prompt certification by our chief executive officer of any material non‑compliance with any corporate governance
rules, and (c) provide a brief description of the significant differences between our corporate governance practices and the NYSE corporate
governance practice required to be followed by U.S. listed companies.

The following discussion summarizes the significant differences between our current corporate governance practices (which will remain in

effect until we implement Federal Law No. 13,303/16 and the new Novo Mercado requirements) and those required of U.S. listed companies:

Majority of Independent Directors

The NYSE rules require that a majority of the board must consist of independent directors.  Independence is defined by various criteria,
including  the  absence  of  a  material  relationship  between  the  director  and  the  listed  company.    While  the  Brazilian  Corporate  Law  did  not
previously have a similar requirement, Federal Law No. 13,303/16 established that at least 25% of the members of the board of directors must
be  independent.    Under  the  Novo  Mercado  Regulations,  our  board  of  directors  must  evaluate  the  independence  of  directors  before  their
election to the board. Such evaluation shall be based on a declaration prepared by the nominee.  Additionally, Brazilian Corporate Law, Federal
Law  No.  13,303/16  and  the  CVM  have  established  rules  that  require  directors  to  meet  certain  qualification  requirements  applicable  to  a
company’s directors.  Under our current bylaws, approved on April 27, 2018, our board of directors must have a minimum of seven members,
and  25%  of  the  board  must  be  independent,  as  established  by  Federal  Law  No.  13,303/16  and  as  defined  under  Novo  Mercado
Regulations.  Currently, seven of our ten directors are independent, pursuant to the Novo Mercado Listing Regulations and Federal Law No.
13,303/16.  We believe these rules provide adequate assurances that our directors are independent; however, they do not require that we have a
majority of independent directors, as required under the NYSE rules.

Executive Sessions

NYSE rules require that the non‑management directors must meet at regularly scheduled executive sessions without management present. 
The Brazilian Corporate Law does not have a similar provision.  According to the Brazilian Corporate Law, up to one‑third of the members of
the  board  of  directors  can  be  elected  from  management.    There  is  no  requirement  that  non‑management  directors  meet  regularly  without
management.    Our  Chief  Executive  Officer  is  a  member  of  our  board  of  directors.    All  other  members  of  our  board  of  directors  meet  the
NYSE’s definition of “non‑management” directors.  The non‑management directors on our board do not typically meet in executive session. 
Our board of directors consists of seven non-management directors.

Fiscal Committee

Under  the  Brazilian  Corporate  Law,  the  Conselho Fiscal,  or  fiscal  committee,  is  a  corporate  body  independent  of  management  and  a
company’s  external  auditors.    The  fiscal  committee  may  be  either  permanent  or  non‑permanent,  in  which  case  it  is  appointed  by  the
shareholders to act during a specific fiscal year.  A fiscal committee is not equivalent to, or comparable with, a U.S. audit committee.  The
primary  responsibility  of  the  fiscal  committee  is  to  review  management’s  activities  and  a  company’s  financial  statements,  and  to  report  its
findings to the company’s shareholders.  The Brazilian Corporate Law requires fiscal committee members to receive as remuneration at least
10% of the average annual amount paid to a company’s executive officers.  The Brazilian Corporate Law requires a fiscal committee to be
composed of a minimum of three and a maximum of five members and their respective alternates.

Under the Brazilian Corporate Law, the fiscal committee may not contain members that (i) are on our board of directors, (ii) are on the
board  of  executive  officers,  (iii)  are  employed  by  us  or  a  controlled  company,  or  (iv)  are  spouses  or  relatives  of  any  member  of  our
management, up to the third degree.

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Currently,  our  fiscal  committee  consists  of  four  members  and  three  alternates.  Although  each  member  must  have  his  or  her  respective
alternate,  we  currently  only  have  three  alternates  due  to  the  resignation  of  one  of  the  alternates  immediately  following  election. The  fiscal
committee members generally meet once a month.

Audit Committee

NYSE rules require that listed companies have an audit committee that (i) is composed of a minimum of three independent directors who
are  all  financially  literate,  (ii)  meets  the  SEC  rules  regarding  audit  committees  for  listed  companies,  (iii)  has  at  least  one  member  who  has
accounting  or  financial  management  expertise  and  (iv)  is  governed  by  a  written  charter  addressing  the  committee’s  required  purpose  and
detailing  its  required  responsibilities.    However,  as  a  foreign  private  issuer,  we  need  only  to  comply  with  the  requirement  that  the  audit
committee meet the SEC rules regarding audit committees for listed companies to the extent compatible with Brazilian Corporate Law.  Our
audit  committee,  which  is  not  equivalent  to,  or  comparable  with,  a  U.S.  audit  committee,  provides  assistance  to  our  board  of  directors  on
matters involving accounting, internal controls, financial reporting and compliance.  The audit committee is mainly responsible for assisting
and advising the board of directors in its responsibilities to ensure the quality, transparency and integrity of our published financial information
and  financial  statements.    The  audit  committee  is  also  responsible  for  supervising  all  matters  relating  to  the  Code  of  Ethics  and  Conduct,
accounting,  internal  controls,  the  internal  and  independent  audit  functions,  compliance,  risk  management  and  internal  policies,  such  as  the
related parties transaction policy.   The audit committee comprises three members appointed by the board of directors, and, pursuant to our
bylaws, the members of our audit committee may be appointed simultaneously to their election to the board of directors or by a subsequent
resolution. The members of the audit committee shall perform their duties for the duration of their respective terms as board members or until
otherwise  decided  by  the  shareholders’  meeting  or  by  the  board  of  directors.  In  the  event  that  an  audit  committee  member  resigns  or  is
removed from office after exercising any portion of his or her term, such member may only rejoin the audit committee at least three years from
the end of his or her term. The current members of our audit committee are Jerônimo Antunes, Lucas Navarro Prado and Luís Eduardo Alves
de Assis. All members meet the independent membership requirements of the SEC and NYSE as well as other NYSE requirements.  Jerônimo
Antunes  is  the  committee’s  “financial  expert”  within  the  scope  of  the  SEC  rules  covering  the  disclosure  of  financial  experts  on  audit
committees in periodic filings pursuant to the U.S. Securities Exchange Act of 1934.

Corporate Risks Management Committee

In 2009, our board of executive officers created a Corporate Risks Management Committee, which is responsible for: (a) evaluating the
maximum level of risk that our Management should incur in our operations in order to obtain planned results; (b) evaluating the identification,
measurement,  treatment  and  processing  of  risks  in  action  plans;  and  (c)  forwarding  statements,  proposals  and  evaluations  to  the  audit
committee  and  to  the  board  of  executive  officers  for  review,  and  submitting  such  statements,  proposals  and  evaluations  to  the  board  of
directors  for  approval.    The  Corporate  Risks  Management  Committee  has  a  coordinator  and  consists  of  representatives  from  the  following
management  divisions:  CEO’s  Office;  Corporate  Management;  Technology,  Enterprises  and  Environment;  Metropolitan;  Economics  and
Finance and Investor Relations; and Regional Systems.

Nomination/Corporate Governance and Compensation Committees

NYSE rules require that listed companies have a nomination/corporate governance committee and a compensation committee composed
entirely  of  independent  directors  and  governed  by  a  written  charter  addressing  the  committee’s  required  purpose  and  detailing  its  required
responsibilities.    Required  responsibilities  for  the  nomination/corporate  governance  committee  include,  among  other  things,  identifying  and
selecting  qualified  board  member  nominees  and  developing  a  set  of  corporate  governance  principles  applicable  to  the  company.    Required
responsibilities  for  the  compensation  committee  include,  among  other  things,  reviewing  corporate  goals  relevant  to  the  chief  executive
officer’s compensation, evaluating the chief executive officer’s performance, approving the chief executive officer’s compensation levels and
recommending to the board non‑chief executive officer compensation, incentive‑compensation and equity‑based plans.

Under  the  Brazilian  Corporate  Law,  we  are  not  required  to  have  a  nomination/corporate  governance  committee  or  compensation
committee.    However,  Federal  Law  No.  13,303/16  and  State  Decree  62,349/16  established  the  requirement  of  a  committee  with  the
responsabilities  of  verifying  the  nomination  process  of  the  members  of  the  management  and  of  the  fiscal  committee.  In  our  annual
shareholders’ meeting, held on April 27, 2018, our bylaws were amended in order to, among other things, create the Eligibility and Advisory
Committee in compliance with Federal Law No. 13,303/16 and State Decree 62,349/16.

This committee will be composed of up to three members, elected by a general shareholders’ meeting. Members must have at least three
years’ professional experience in public administration, or three years’ experince in the private sector in an area in which, or related to which,
we operate.

Members of the Eligibility and Advisory Committee may attend board of directors’ meetings where matters related to this committee are

discussed and will have the right to speak, but not to vote, in accordance with our bylaws.

This  committee  will  be  also  responsible  for  providing  methodological  and  procedural  support  to  the  board  of  directors  to  evaluate  the

performance of officers and other members of statutory committees

We  expect  that  a  written  charter  addressing  the  committee’s  purpose  and  detailing  its  required  responsibilities  will  be  approved  by  the

board of directors.

Under  the  Brazilian  Corporate  Law,  the  total  amount  available  for  compensation  of  our  directors  and  executive  officers  and  for
profit‑sharing  payments  to  our  executive  officers  is  established  by  our  shareholders  at  the  annual  general  meeting.    The  individual
compensation  and  profit‑sharing  of  each  executive  officer,  as  well  as  the  compensation  of  our  board  and  committee  members  is  set  out
according to guidelines from the São Paulo State Government and the CODEC (State Capital Protection Board). 

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Shareholder Approval of Equity Compensation Plans

NYSE rules require that shareholders be given the opportunity to vote on all equity compensation plans and material revisions thereto,
with  limited  exceptions.    We  do  not  currently  have  any  equity  compensation  plan.    If  such  a  plan  were  to  be  implemented,  there  is  no
requirement  under  Brazilian  Corporate  Law  for  the  plan  to  be  approved  by  our  shareholders.    However,  if  the  issuance  of  new  shares  in
connection  with  any  equity  compensation  plan  exceeded  the  authorized  capital  under  our  bylaws,  the  increase  in  capital  would  require
shareholder approval.

Corporate Governance Guidelines

NYSE rules require that listed companies adopt and disclose corporate governance guidelines.  We are in compliance with the adoption of
corporate  governance  provisions  and  guidelines  required  under  the  Novo Mercado  Regulations  and  expect  to  make  any  necessary  changes
needed in order to comply with Federal Law No. 13,303/16, State Decree 62,349/16, and the new Novo Mercado rules by June 2018 and April
2021 deadlines, as applicable. See “Item 9.C Markets—Trading on the Brazilian Stock Exchange—The Novo Mercado Segment” and “Item
16.G—Corporate  Governance—Required  Changes  to  Corporate  Governance  Practices  of  Brazilian  Government-Controlled  Companies.” 
Additionally, under the CVM’s guidelines, we have established (i) the Policy of Publicizing Acts or Relevant Facts and the Preservation of
Confidentiality  which  requires  us  to  publicly  disclose  all  relevant  information  and  (ii)  the  Securities  Negotiation  Policy  which  requires
management  to  inform  the  CVM  and  the  B3  of  any  purchases  or  sales  of  our  securities.    We  believe  the  corporate  governance  guidelines
applicable  to  us  under  the  Novo Mercado  Regulations,  Federal  Law  No.  13,303/16,  State  Decree  62,349/16,  as  well  as  the  CVM,  do  not
conflict  with  the  guidelines  established  by  the  NYSE.    Our  corporate  governance  guidelines  and  practices  are  available  on  our  website  at
www.sabesp.com.br at the following location: Investor Relations – Corporate Governance.

Code of Business Conduct and Ethics

NYSE rules require that listed companies adopt and disclose a code of business conduct and ethics for directors, officers and employees,
and promptly disclose any waivers of the code for directors or executive officers.  We have decided to adopt and disclose a code of ethics and
conduct  applicable  to  all  our  officers,  directors  and  employees.    The  adoption  and  disclosure  of  a  formal  code  is  not  required  under  the
Brazilian Corporate Law.  We believe our formal code addresses the matters required to be addressed by the applicable NYSE and SEC rules.

Federal  Law  No.  13,303/16,  State  Decree  62,349/16  and  the  new  Novo  Mercado  rules  require  the  adoption  of  a  Code  of  Conduct  and
Integrity that should include, among other provisions, guidelines to avoid conflicts of interests, forbiddance of fraudulent acts and corruption,
whistleblowing channels, protective measures to avoid retaliation regarding whistleblowers, periodic training on the content of such code and
sanctions in case of code violations. We intend to amend our code of ethics and conduct to meet the new requirements by the June 30 2018
deadline.

Internal Audit Function

NYSE  rules  require  that  listed  companies  maintain  an  internal  audit  function  to  provide  management  and  the  audit  committee  with
ongoing assessments of the company’s risk management processes and system of internal control.  Our internal audit department reports to our
Chief  Executive  Officer  and  our  audit  committee  and  is  responsible  for  our  compliance  with  the  requirements  of  Section  404  of  the
U.S. Sarbanes Oxley Act of 2002 regarding internal control over financial reporting. 

Anticorruption Compliance

Law No. 12,846, of August 1, 2013 (the “Anticorruption Law”), as further regulated by Decree No. 8,420/2015, introduced the concept of
strict liability for legal entities involved in harmful acts against the public administration, as defined in the Anticorruption Law, subjecting the
violator to penalties both in administrative and civil law.  Similar to the Foreign Corrupt Practices Act of the United States, to which we are
also  subject,  the  Anticorruption  Law  considers  that  an  effective  implementation  of  Compliance  Programs  may  be  used  to  mitigate  the
administrative penalties to be applied as a consequence of a harmful act against the public administration. The program currently consists of a
set of internal mechanisms and procedures related to integrity, monitoring and incentives to report irregularities. The program also focuses on
the  effective  implementation  of  the  Code  of  Ethics  and  Conduct  as  well  as  other  policies  and  guidelines  aimed  at  preventing  fraud  and
corruption.  In  2017,  we  circulated  communications  directed  to  the  entire  company,  reinforcing  the  importance  of  acting  in  accordance  with
laws, regulations and internal policies.

As a mixed capital company, our Compliance Program encompasses two distinct situations – active corruption and passive corruption –
and follows the recommendations of the Organization for Economic Cooperation and Development, the United Nations Office on Drugs and
Crimes, and the World Bank.  Our program incorporates and focuses on high management, structural functioning, the provision of complaint
hotlines, monitoring of third-party relationships, governance and internal controls, risk management, training and communication.

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Citizens’ Access to Information at Sabesp 

Federal  Law  No.  12,527/2011  (LAI),  regulated  by  State  Decree  No.  58.052/2012  and  State  Decree  No.  61.559/2015  determines  that
government entities must create Citizen Information Services – SIC units which receive and manage information requests from the public, and
make available to citizens information requested or otherwise provided the reasons for denial of such information requests.

In order to comply with LAI, we implemented the Citizen Information Service – SIC, structuring the internal flow of information to serve
citizens within the terms provided by this law. We also made a Transparency Portal (Portal da Transparência) available on our website, which
includes  basic  information  required  by  law,  software  for  citizens  to  request  information  and  a  list  of  frequently  requested  information,
according to the standards of the São Paulo State Government.

These duties are linked to the Risk Management area whose main assumption is the transparency, quality of information and compliance

with strategic rules of a listed company.

ITEM 16H.      MINE SAFETY DISCLOSURE

Not applicable.     

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ITEM 17.         FINANCIAL STATEMENTS

Not applicable.

ITEM 18.         FINANCIAL STATEMENTS

PART III  

The following financial statements, together with the reports of the independent registered public accounting firms, are filed as part of this

annual report.  See “Index to Financial Statements”. 

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ITEM 19.         EXHIBITS

Item

1.1

4.1*

4.2*

4.3*

4.4*

4.5*

4.6*

4.7*

4.8*

4.9*

4.10*

4.11*

4.12*

4.14*

4.15*

4.16*

4.17*

4.18*

4.19*

11.1

12.1

12.2

13.1

13.2

Description

Bylaws of the Registrant (English translation) (incorporated by reference to the Form 6-K filed on May 25, 2018).

Agreement between the Registrant and the State Department of Water and Energy (Departamento de Águas e Energia Elétrica—DAEE), dated April 24, 1997
(English translation) (incorporated by reference to Exhibit 10.1 to the Registrant’s Registration Statement on Form F‑1 filed on April 8, 2002 (the “April 8,
2002 Form F‑1”).

Protocol of Understanding between the Registrant and the State of São Paulo, dated September 30, 1997 (English translation) (incorporated by reference to
Exhibit 10.2 to the April 8, 2002 Form F‑1).

Agreement between the Registrant and the State of São Paulo, through the Secretariat of Finance, dated September 10, 2001 (English translation) (incorporated
by reference to Exhibit 10.3 to the April 8, 2002 Form F‑1).

Agreement  between  the  Registrant  and  the  State  of  São  Paulo,  through  the  Secretariat  of  the  Treasury,  dated  December  11,  2001  (English  translation)
(incorporated by reference to Exhibit 10.4 to the April 8, 2002 Form F‑1).

Amendment  to  the  Agreement,  dated  April  24,  1997,  between  the  Registrant  and  the  DAEE,  dated  March  16,  2000  (English  translation)  (incorporated  by
reference to Exhibit 10.5 to the April 8, 2002 Form F‑1).

Amendment to the Agreement, dated April 24, 1997, between the Registrant and the DAEE, dated November 21, 2001 (English translation) (incorporated by
reference to Exhibit 10.6 to the April 8, 2002 Form F‑1).

First Amendment to the Agreement, dated December 11, 2001, between the Registrant and the State of São Paulo, dated March 22, 2004. (English translation)
(incorporated by reference to Exhibit 4.7 to the Form 20‑F filed on June 28, 2004).

Second  Amendment  to  the  Agreement,  dated  December  11,  2001,  between  the  Registrant  and  the  State  of  São  Paulo,  dated  December  28,  2007.  (English
translation) (incorporated by reference to the Form 6‑K filed on February 25, 2008).

Third  Amendment  to  the  Agreement,  dated  December  11,  2001,  between  the  Registrant  and  the  State  of  São  Paulo,  dated  November  17,  2008.  (English
translation) (incorporated by reference to the Form 6‑K filed on December 23, 2008).

Commitment  Agreement,  between  the  Registrant  and  the  State  of  São  Paulo,  dated  March  26,  2008.  (English  translation)  (incorporated  by  reference  to  the
Form 6‑K filed on April 28, 2008).

Agreement Executed between the Registrant and the São Paulo City Government, dated November 14, 2007 (English Translation) (incorporated by reference
to the Form 6‑K filed on March 12, 2008).

Amendment  to  the  Agreement  Executed  between  the  Registrant  and  the  São  Paulo  City  government,  dated  February  10,  2008  (English  translation)
(incorporated by reference to the Form 6‑K filed on May 12, 2008).

The Audit Committee Charter dated April 19, 2016 (English translation) (incorporated by reference to the Form 6‑K filed on April 21, 2016).

Convention between the State and the city of São Paulo, dated June 23, 2010, with the intermediation and consent of the Registrant and of ARSESP (English
translation) (incorporated by reference to the Form 6‑K filed on July 13, 2010).

Contract  to  provide  public  water  supply  and  sewage  services,  among  the  Registrant,  the  State  and  the  city  of  São  Paulo,  dated  June  23,  2010  (English
translation) (incorporated by reference to the Form 6‑K filed on July 13, 2010).

Term of Agreement between the Registrant, the State of São Paulo and the DAEE, dated March 18, 2015 (English translation) (incorporated by reference to the
Form 6‑K filed on April 15, 2015).

Notice of Transactions with Related Parties, dated November 9, 2016, (English translation) (incorporated by reference to the Form 6-K filed on November 16,
2016).

First  Amendment  to  the  Private  Instrument  of  Settlement  and  Other  Covenants  bewteen  the  Registrant  and  EMAE,  dated  October,  19,  2017  (English
translation) (incorporated by reference to the Form 6-K filed on November 9, 2017).

Code of Ethics and Conduct dated June 1, 2014 (English translation) (incorporated by reference to the Form 6‑K filed on July 24, 2014).

Certification of Karla Bertocco Trindade, Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of Rui de Britto Álvares Affonso, Chief Financial Officer and Investor Relations Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of
2002.

Certification of Karla Bertocco Trindade, Chief Executive Officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002.  

Certification of Rui de Britto Álvares Affonso, Chief Financial Officer and Investor Relations Officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant
to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS**

XBRL Instance Document

101.SCH**

XBRL Taxonomy Extension Schema Document

101.CAL**

XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF**

XBRL Taxonomy Extension Definition Linkbase Document

101.LAB**

XBRL Taxonomy Extension Label Linkbase Document

101.PRE**

XBRL Taxonomy Extension Presentation Linkbase Document

(*) Previously filed.

(**)  IN  ACCORDANCE  WITH  THE  TEMPORARY  HARDSHIP  EXEMPTION  PROVIDED  BY  RULE  201  OF  REGULATION  S-T,  THE  DATE  BY  WHICH  THE
INTERACTIVE DATA FILE IS REQUIRED TO BE SUBMITTED HAS BEEN EXTENDED BY SIX BUSINESS DAYS.

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The registrant hereby certifies that it meets all of the requirements for filing on Form 20‑F/A and that it has duly caused and authorized the

undersigned to sign this Amendment No. 1 to the annual report on its behalf.

SIGNATURES

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO ‑
SABESP

By:         /s/ Karla Bertocco Trindade                                               

Name:      Karla Bertocco Trindade
Title:        Chief Executive Officer

By:         /s/ Rui de Britto Álvares Affonso                       
Name:      Rui de Britto Álvares Affonso
Title:         Chief Financial Officer and Investor
                  Relations Officer

Date:  May 30, 2018

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Companhia de Saneamento Básico do Estado 
de São Paulo - SABESP

Financial Statements as at December 31, 2017 and 2016
And for the years ended
December 31, 2017, 2016 and 2015

F-1

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders, Board of Directors and Management of
Companhia de Saneamento Básico do Estado de São Paulo - SABESP
São Paulo - SP

Opinion on the Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying statement of financial position of Companhia Saneamento Básico do Estado de São Paulo -
SABESP (the Company) as of December 31, 2017 and 2016, the related statements of income, comprehensive income, changes in
equity, and cash flows for each of the years in the two-year period ended December 31, 2017, and the related notes collectively, the
financial statements. We also have audited the Company’s internal control over financial reporting as of December 31, 2017, based
on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations
of the Treadway Commission.

In  our  opinion,  the  financial  statements  referred  to  above  present  fairly,  in  all  material  respects,  the  financial  position  of  the
Company as of December 31, 2017and 2016, and the results of its operations and its cash flows for each of the years in the two-
year  period  ended  December  31,  2017,  in  conformity  with  International  Financial  Reporting  Standards  as  issued  by  the
International  Accounting  Standards  Board.  Also  in  our  opinion,  the  Company  maintained,  in  all  material  respects,  effective
internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control – Integrated
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited the adjustment to the previously reported segment information for 2015 described in note 24 to the financial
statements. In our opinion, such adjustments to the 2015 segment information are appropriate and have been properly applied.
We were not engaged to audit, review, or apply any procedures to the 2015 financial statements of the Company other than with
respect  to  the  restatement  of  previously  reported  segment  information  and,  accordingly,  we  do  not  express  an  opinion  or  any
other form of assurance on the 2015 financial statements taken as a whole.

Basis for Opinions

The Company’s management is responsible for these financial statements, for maintaining effective internal control over financial
reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying
financial  statements.  Our  responsibility  is  to  express  an  opinion  on  the  Company’s  financial  statements  and  an  opinion  on  the
Company’s  internal  control  over  financial  reporting  based  on  our  audits.  We  are  a  public  accounting  firm  registered  with  the
Public  Company  Accounting  Oversight  Board  (United  States)  (PCAOB)  and  are  required  to  be  independent  with  respect  to  the
Company  in  accordance  with  the  U.S.  federal  securities  laws  and  the  applicable  rules  and  regulations  of  the  Securities  and
Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the
audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to
error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the financial statements included performing procedures to assess the risks of material misstatement of the financial
statements,  whether  due  to  error  or  fraud,  and  performing  procedures  that  respond  to  those  risks.  Such  procedures  included
examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included
evaluating  the  accounting  principles  used  and  significant  estimates  made  by  management,  as  well  as  evaluating  the  overall
presentation  of  the  financial  statements.  Our  audit  of  internal  control  over  financial  reporting  included  obtaining  an
understanding  of  internal  control  over  financial  reporting,  assessing  the  risk  that  a  material  weakness  exists,  and  testing  and
evaluating  the  design  and  operating  effectiveness  of  internal  control  based  on  the  assessed  risk.  Our  audits  also  included
performing  such  other  procedures  as  we  considered  necessary  in  the  circumstances.  We  believe  that  our  audits  provide  a
reasonable basis for our opinions.

We have served as the Company’s auditor since 2016.  

/s/ KPMG Auditores Independentes

São Paulo – Brazil

April 26, 2018 

F-2

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of

Companhia de Saneamento Básico do Estado de São Paulo - SABESP

São Paulo - SP

We  have  audited,  before  the  effects  of  the  retrospective  adjustments  to  the  disclosures  for  a  change  in  the  composition  of
reportable  segments  discussed  in  Note  24  to  the  financial  statements,  the  accompanying  statements  of  income,  comprehensive
income,  shareholders’  equity  and  cash  flows  of  Companhia  de  Saneamento  Básico  do  Estado  de  São  Paulo  -  SABESP  (the
“Company”)  for  the  year  ended  December  31,  2015.  These  financial  statements  are  the  responsibility  of  the  Company’s
management. Our responsibility is to express an opinion on these financial statements based on our audit.

We  conducted  our  audit  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United  States).
Those  standards  require  that  we  plan  and  perform  the  audit  to  obtain  reasonable  assurance  about  whether  the  financial
statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates
made  by  management,  as  well  as  evaluating  the  overall  financial  statement  presentation.  We  believe  that  our  audit  provide  a
reasonable basis for our opinion.

In our opinion, such financial statements, before the effects of the retrospective adjustments to the disclosures for a change in the
composition of reportable segments discussed in Note 24 to the financial statements, present fairly, in all material respects, the
results of operations and cash flows of Companhia de Saneamento Básico do Estado de São Paulo - SABESP for the year ended
December  31,  2015,  in  accordance  with  International  Financial  Reporting  Standards  (IFRS),  issued  by  the  International
Accounting Standards Board (IASB).

We were not engaged to audit, review, or apply any procedures to the retrospective adjustments to the disclosures for a change in
the composition of reportable segments discussed in Note 24 to the financial statements and, accordingly, we do not express an
opinion  or  any  other  form  of  assurance  about  whether  such  retrospective  adjustments  are  appropriate  and  have  been  properly
applied. Those retrospective adjustments were audited by other auditors.

São Paulo, Brazil

May 11, 2016 

/s/ DELOITTE TOUCHE TOHMATSU

Auditores Independentes

F-3

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statement of Financial Position as of December 31, 2017 and 2016
Amounts in thousands of reais

Assets

Current assets
   Cash and cash equivalents
   Trade receivables
   Accounts receivable from related parties

   Inventories
   Restricted cash
   Recoverable taxes

   Other receivables

Total current assets

Noncurrent assets
   Trade receivables
   Accounts receivable from related parties

   Escrow deposits
   Deferred income tax and social contribution
   Water National Agency – ANA

   Other receivables

   Investments
   Investment properties
   Intangible assets
   Property, plant and equipment

Note

7
9 (a)
10 (a)

8
17 (a)

9 (a)
10 (a)

18
11

12
13
14
15

Total noncurrent assets

Total assets
The accompanying notes are an integral part of these financial statements.

F-4

December 31, 2017

December 31, 2016

2,283,047
1,672,595
180,773

85,671
18,822
276,585
56,592
4,574,085

215,910
634,387

122,686
-
70,487

113,123

36,932
57,652
33,466,132
255,050

34,972,359
39,546,444

1,886,221
1,557,472
202,553

58,002
24,078
42,633
52,676

3,823,635

153,834
669,156

77,915
186,345
81,221

114,693

31,096
57,968
31,246,788
302,383

32,921,399
36,745,034

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statement of Financial Position as of December 31, 2017 and 2016
Amounts in thousands of reais

Liabilities and equity
Current assets

   Trade payables and contractors
   Current portion of long-term borrowings and financing

   Accrued payroll and related taxes
   Taxes and contributions
   Interest on capital
   Provisions
   Services payable
   Public-Private Partnership - PPP
   Program Contract Commitments

   Other liabilities

Total current liabilities

Noncurrent liabilities
   Borrowings and financing

Deferred income tax and social contribution

   Deferred Cofins and PASEP
   Provisions
   Pension obligations
   Public-Private Partnership - PPP
   Program Contract Commitments
   Other liabilities

Total noncurrent liabilities

Total liabilities

Equity

   Capital stock

   Earnings reserves

   Other comprehensive loss

Total equity

Total equity and liabilities
The accompanying notes are an integral part of these financial statements.

Note

December 31, 2017

December 31, 2016

16

17 (b)
22 (c)
19 (a)
21
14 (g)
14 (c) (iv)

16
18

19 (a)
20 (b)
14 (g)
14 (c) (iv)

22

F-5

344,947
1,746,755

588,073
183,965
598,612
607,959
408,275
60,007
128,802
104,485

4,771,880

10,354,211
36,754

130,182
470,245
2,932,338
3,011,409
110,698
215,778

17,261,555

311,960
1,246,567

458,299
168,757
700,034
730,334
460,054
31,898
109,042
85,563

4,302,508

10,717,576
-

138,071
442,741
3,265,250
2,217,520
69,051
173,106

17,023,315

22,033,435

21,325,823

10,000,000

8,051,110
(538,101)

17,513,009
39,546,444

10,000,000

6,244,859
(825,648)

15,419,211
36,745,034

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Income Statements for the
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Net operating income

      Cost of services

Gross profit

      Selling expenses
      Administrative income (expenses)

      Other operating income (expenses), net

Equity in results of investments in affiliaties

Profit from operations before finance income (expenses)
and income tax and social contribution

      Financial expenses
      Financial revenues

      Exchange result, net

Financial result, net

Note

2017

2016

2015

26 (b)

27

14,608,233
(8,778,963)

14,098,208
(9,013,120)

11,711,569
(8,260,763)

27
27
29

12

28
28

28

5,829,270

5,085,088

3,450,806

(768,693)
(1,098,990)
(5,679)
5,760

(730,047)
(934,896)
4,722
4,740

(598,125)
44,958
143,755
2,597

3,961,668

3,429,607

3,043,991

(688,280)
326,244
(96,018)

(839,891)
448,710
1,090,628

(859,732)
395,234
(1,991,964)

(458,054)

699,447

(2,456,462)

Profit before income tax and social contribution

3,503,614

4,129,054

587,529

Income tax and social contribution
      Current

      Deferred

18 (d)

18 (d)

(882,787)
(101,517)

(1,121,289)
(60,667)

(984,304)

(1,181,956)

Profit for the year

Earnings per share – basic and diluted (in reais)

23

2,519,310

2,947,098

3.69

4.31

(1,226)
(50,024)

(51,250)

536,279

0.78

The accompanying notes are an integral part of these financial statements.

F-6

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Comprehensive Income for the
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais

Profit for the year

2,519,310

2,947,098

536,279

 Other comprehensive income (loss)

287,547

(472,266)

36,366

Note

2017

2016

2015

      Items which will not be subsequently reclassified
      to the income statement:

      Actuarial gains and (losses) on defined benefit
      plans

20 (b)

287,547

(472,266)

36,366

Total comprehensive income for the year

2,806,857

2,474,832

572,645

The accompanying notes are an integral part of these financial statements.

F-7

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Changes in Equity for the
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Earnings reserves

Note

Capital
stock
  10,000,000

Legal
Reserve

Investment
reserve

Additional
dividend
proposed

Retained
earnings

Other
comprehensive
loss

Total

758,141

2,914,008

22,002

-

(389,748)

13,304,403

Balances as of December 31, 2014

   Net income for the year

   Actuarial gains (losses)

   Total comprehensive income for the year

   Legal reserve

   Interest on capital (R$0.1863 per share)
   2014 additional proposed dividends, approved
(R$0.0554 per share)

   Additional proposed dividends
      Withholding  income  tax  on  interest  on  capital
attributable as minimum mandatory dividends

20 (b)

22 (d)

22 (c)

22 (c)

-

-

-

-

-

-

-

-

   Transfer to investments reserve

Balances as of December 31, 2015

-
  10,000,000

   Net income for the year

   Actuarial gains (losses)

   Total comprehensive income for the year

   Legal reserve

   Interest on capital (R$1.0240 per share)
   2015 additional proposed dividends, approved
(R$0.0330 per share)

   Additional proposed dividends
   Withholding income tax on interest on capital
attributable as minimum mandatory dividends

20 (b)

22 (d)

22 (c)

22 (c)

-

-

-

-

-

-

-

-

   Transfer to investments reserve

Balances as of December 31, 2016

-
  10,000,000

-

-

-

147,355

-

-

-

-

-

-

-

-

26,814

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

536,279

-

536,279

(26,814)

(127,366)

(22,002)

-

22,527

(22,527)

(11,074)

-

359,572

-

(359,572)

-

536,279

36,366

36,366

-

-

-

-

-

-

36,366

572,645

-

(127,366)

(22,002)

-

(11,074)

-

784,955

3,273,580

11,453

-

(353,382)

13,716,606

2,947,098

-

2,947,098

-

(472,266)

(472,266)

2,947,098

(472,266)

2,474,832

-

-

-

-

-

-

-

-

-

-

-

-

-

(147,355)

(699,936)

(11,453)

-

123,557

(123,557)

(60,838)

-

1,976,250

-

(1,976,250)

932,310

5,249,830

62,719

-

(825,648)

15,419,211

2,519,310

-

2,519,310

-

287,547

287,547

   Net income for the year

   Actuarial gains (losses)

   Total comprehensive income for the year

   Legal Reserve

   Interest on capital (R$0.87539 per share)
   2016 additional proposed dividends, approved
(R$0.09176 per share)

   Additional proposed dividends
      Withholding  income  tax  on  interest  on  capital
attributable as minimum mandatory dividends

   Transfer to investments reserve

20 (b)

22 (d)

22 (c)

22 (c)

-

-

-

-

-

-

-

-

-

-

-

125,965

-

-

-

-

-

-

-

-

-

-

-

-

22 (f)

-
-
  10,000,000 1,058,275

-

-

-

-

-

(62,719)

105,543

2,519,310

(125,965)

(598,336)

-

(105,543)

(52,004)

-

1,689,466

-

(1,689,466)

-

-

-

-

-

-

-

(699,936)

(11,453)

-

(60,838)

-

287,547

2,806,857

-

-

-

-

-

-

-

(598,336)

(62,719)

-

(52,004)

-

6,939,296
Balances as of December 31, 2017
The accompanying notes are an integral part of these financial statements.

53,539

-

(538,101)

17,513,009

F-8

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Cash Flows for the
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais                                                                                                                                                                            

Cash flow from operating activities
    Profit before income tax and social contribution

 Adjustments for:
    Depreciation and amortization
    Residual value of property, plant and equipment and intangible assets written-off
    Bad debt expense
    Provisions and inflation adjustment
    Pension plan liabilities – early reduction (curtailment)
    Interest calculated on borrowings and financing payable
    Inflation adjustment and exchange gains (losses) on borrowings and financing
    Interest and inflation adjustment on liabilities
    Interest and inflation adjustment on assets
    Finance charges from customers
    Margin of fair value on intangible assets arising from concession
    Provision for Consent Decree (TAC)
    Share of profit of investees
    Provision from São Paulo agreement
    Provision for pension plan - Sabesprev Mais
    Pension obligations

  Other adjustments
    GESP Agreement

Changes in assets
   Trade receivables
   Accounts receivable from related parties
   Inventories
   Recoverable taxes
   Escrow deposits
   Other receivables

Changes in liabilities
   Trade payables and contractors

   Services payable
   Accrued payroll and related taxes
   Taxes and contributions payable
   Deferred Cofins/PASEP
   Provisions
   Pension obligations
   Other liabilities

Cash generated from operations

   Interest paid
   Income tax and social contribution paid
Net cash generated from operating activities

Cash flows from investing activities

   Acquisition of intangible
   Restricted cash
   Investment increase
   Purchase of property, plant and equipment
   Dividends received
Net cash used in investing activities

The accompanying notes are an integral part of these financial statements.
F-9

December 31,
2017

December 31,
2016

December 31,
2015

3,503,614

4,129,054

587,529

1,301,897
24,935
82,681
185,080
-
426,781
159,087
25,751
(31,619)
(193,683)
(70,335)
72,933
(5,760)
-
-
304,500

92,461

-

1,146,626
15,168
90,488
276,654
(334,152)
449,470
(969,430)
24,297
(80,675)
(207,789)
(81,513)
89,083
(4,740)
-
235
377,886

24,412
-

1,074,032
52,040
2,420
(4,706)
-
474,056
2,163,754
27,168
(130,762)
(125,966)
(72,908)
(15,601)
(2,597)
11,252
8,349
352,710

(6,103)
(696,283)

5,878,323

4,945,074

3,698,384

(42,194)
51,594
(27,633)
(233,952)
(32,200)
8,312

(180,353)

(51,779)

56,841
15,983
(7,889)
(279,951)
(228,282)
(16,741)

(34,665)
(3,163)
7,156
35,195
33,232
144,920

6,371

72,775
21,240
(90,325)
5,150
(185,793)
(201,736)
17,842

(111,738)
(2,818)
(550)
70,940
35,083
(9,785)

(18,314)

57,054
(24,394)
35,947
3,570
(133,427)
(182,514)
(47,607)

4,910,079

4,773,273

3,369,831

(676,087)
(932,110)

3,301,882

(1,957,780)
5.256
-
(18,920)
-

(739,944)
(1,029,737)

3,003,592

(2,108,167)
5,078
-
(27,631)
-

(710,688)
(17,743)

2,641,400

(2,397,352)
(9,406)
(2,540)
(54,794)
4,612

(1,971,444)

(2,130,720)

(2,459,480)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Cash Flows for the
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais                                                                                                                                                                            
                                               (continued)

Cash flows from financing activities

   Borrowings and financing
       Proceeds from loans
       Payment of loans
  Payment of interest on capital
  Public-Private Partnership - PPP
  Program Contract Commitments
Net cash generated by (used in) financing activities

December 31,
2017

December 31,
2016

December 31,
2015

1,007,572
(1,098,558)
(765,933)
(31,758)
(44,935)

(933,612)

1,250,524
(1,535,312)
(139,399)
(30,498)
(171,180)

(625,865)

1,303,296
(1,292,322)
(202,115)
(23,799)
(50,757)

(265,697)

Increase/(decrease) in cash and cash equivalents

396,826

247,007

(83,777)

Represented by :
Cash and cash equivalents at the beginning of the year
Cash and cash equivalents at the end of the year
Increase/(decrease) in cash and cash equivalents

1,886,221
2,283,047
396,826

1,639,214
1,886,221
247,007

1,722,991
1,639,214
(83,777)

The accompanying notes are an integral part of these financial statements.
F-10

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

1    Operations

Companhia  de  Saneamento  Básico  do  Estado  de  São  Paulo  ("SABESP"  or  the  "Company")  is  a  mixed-capital  company
headquartered in São Paulo, at Rua Costa Carvalho, 300, CEP 05429-900, controlled by the São Paulo State Government.
The Company is engaged in the provision of basic and environmental sanitation services in the State of São Paulo, as well as
it supplies treated water and sewage services on a wholesale basis. 

In addition to providing basic sanitation services in the State of São Paulo, SABESP may performs these activities in other
states and countries, and can operate in drainage, urban cleaning, solid waste handling and energy markets. SABESP aims to
be a world reference in the provision of sanitation services, in a sustainable, competitive and innovative manner, with a focus
on customers.

As of December 31, 2017, the Company operated water and sewage services in 368 municipalities of the State of São Paulo.
Most of these municipalities operations are based on 30-year concession, program and services contracts.  The Company has
two partial contracts with the municipality of Mogi das Cruzes, however, since most of municipality is serviced by wholesale,
it was not included in the 368 municipalities. As of December 31, 2017, the Company had 370 contracts.

SABESP is not temporarily operating in the municipalities of Macatuba and Cajobi due to judicial orders. The lawsuits are in
progress and the carrying amount of these municipalities’ intangible assets was R$4,345 as of December 31, 2017 (R$4,345
as of December 31, 2016).

As of December 31, 2017, 51 concession agreements (54 as of December 31, 2016) had expired and are being negotiated. From
2018 to 2030, 32 concession agreements will expire. Management believes that concession agreements expired and not yet
renewed will result in new contracts, disregarding the risk of discontinuity in the provision of municipal water supply and
sewage services. By December 31, 2017, 287 program and services contracts were signed (281 contracts as of December 31,
2016).

As of December 31, 2017, the carrying amount of the underlying assets used in the 51 concessions of the municipalities under
negotiation totaled R$6,205,337, accounting for 18.54% of the total of intangible assets, and the related gross revenue for the
year ended December 31, 2017 totaled R$1,577,787, accounting for 10,26% of the total of gross revenue.

The Company’s operations are concentrated in the municipality of São Paulo, which represents 55.38% of the gross revenues
as of December 31, 2017 (55.46% as of December 31, 2016 and 51.79% as of December 31, 2015) and 46.92% of intangible
assets (46.57% on December 31, 2016).

The accompanying notes are an integral part of these financial statements.
F-11

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

On June 23, 2010, the State of São Paulo, the Municipality of São Paulo, the Company and the regulatory agency “Sanitation
and  Energy  Regulatory  Agency  –  ARSESP”  signed  an  agreement  to  share  the  responsibility  for  water  supply  and  sewage
services to the Municipality of São Paulo based on a 30-year concession agreement. This agreement is extendable for another
30 years, pursuant to the law.  This agreement sets forth SABESP as the exclusive service provider and designates ARSESP as
regulator, establishing prices, controlling and monitoring services. On the same date, the State of São Paulo, the Municipality
of  São  Paulo  and  SABESP  signed  the  “Public  service  provision  agreement  of  water  supply  and  sewage  services”,  a  30-year
concession agreement which is extendable for another 30 years. This agreement involves the following activities:

i. protection of the sources of water in collaboration with other agencies of the State and the City;
ii. capture, transport and treatment of water;
iii. collect, transport, treatment and final dispose of  sanitary sewage; and
iv. adoption of other actions of basic and environmental sanitation.

The Company operates under an authorization by public deed in some municipalities in the Santos coast region and in the
Ribeira Valley, where the Company started to operate after the merger of the companies that formed it. In September 2015,
the Company entered into a water supply and sewage public utility services agreement with the municipality  of Santos; the
gross revenue calculated in the year ended December 31, 2017 totaled R$ 294.658 (R$280,689 as of December 31, 2016 and
R$269,530  as  of  December  31,  2015)  and  the  intangible  asset  was  R$310,577  in  the  year  ended  December  31,  2017
(R$303,540 as of December 31, 2016). 

Article  58  of  Law  11,445/07  determines  that  precarious  and  overdue  concessions,  as  well  as  those  effective  for  an
undetermined period of time, including those that do not have an instrument formalizing them, will be valid until December
31,  2010.  However,  Article  2  of  Law  12,693  of  July  24,  2012,  which  amended  Article  7°-A  of  Law  11,578,  of  November  26,
2007, allowed the provision of public basic sanitation services to be executed until December 31, 2016.

The Company’s Management understands that in the municipalities where the concession agreements were not yet renewed,
the operation is governed by Laws 8,987/95 and 11,445/07, including those municipalities served without an agreement.

Public deeds are valid and governed by the Brazilian Civil Code.

The accompanying notes are an integral part of these financial statements.
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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

The Company's shares have been listed in the Novo Mercado (New Market) segment of B3 under the ticker symbol SBSP3
since April 2002 and on the New York Stock Exchange (NYSE) as American Depositary Receipts (“ADRs”) Level III, under
the SBS code, since May 2002.

Since 2008, the Company has been setting up partnerships with other companies, which resulted in the following companies:
Sesamm, Águas de Andradina, Saneaqua Mairinque, Aquapolo Ambiental, Águas de Castilho, Attend Ambiental and Paulista
Geradora de Energia. Although SABESP has no majority interest in the capital stock of these companies, the shareholders’
agreements  provide  for  the  power  of  veto  and  casting  vote  in  certain  issues  jointly  with  associates,  indicating  the  shared
control in the management of investees.

As of March 3, 2018, the Jaguari-Atibainha interconnection was inaugurated; this interconnection will allow the transfer of
an average annual outflow of 5.13 cubic meters per second (m³/s) and a maximum outflow of 8.5 m³/s from the Paraíba do
Sul  Basin  to  the  Cantareira  System.  Expected  to  be  inaugurated  in  April  2018,  the  São  Lourenço  Production  System  will
expand  water  production  and  capacity  by  6.4  m³/s.  After  construction  is  completed,  the  Company  will  have  nine  large
production systems available to supply the São Paulo Metropolitan Region. These two important works aim at expand water
security in the São Paulo Metropolitan Region.

Management expects that with the normalization of rainfall, the generation of operating cash and the credit lines available
for  investment,  the  Company  will  have  sufficient  funds  to  meet  its  commitments  and  not  compromise  its  necessary
investments.

Corporate reorganization

As of May 12, 2017, the Board of the State Privatization Program approved:

(i)        the conducting of studies for SABESP’s Capitalization (as defined below);

(ii)      the hiring, by SABESP, of the International Finance Corporation, which is associated with the World Bank;

(iii)    the execution of an agreement between SABESP and the State Government through the Water Resources and Sanitation
Department  and  the  Treasury  Department,  in  order  to  define  the  scope  of  the  contract  and  control  the  relationship
between the parties, including a proportional expense reimbursement.

The proposed Capitalization provides for the creation of a corporation to directly control SABESP through the transfer of the
shares held by the State of São Paulo to the capital stock of the new corporation. The State of São Paulo will continue holding
a  sufficient  number  of  shares  to  ensure  SABESP’s  control,  as  provided  for  in  law.  The  objective  of  the  Capitalization  is  to
overcome a situation that restricts investments designed to preserve the expansion of activities to ensure the universalization
of basic sanitation services offered by the Company.

The  Capitalization  may  provide  for  the  admission  of  institutional  investors  to  contribute  financial  resources  to  the  capital
stock of the new company, strengthening SABESP’s corporate governance and business efficiency in order to promote and
accelerate the universalization of sanitation services in the State of São Paulo.

As of      September 15, 2017, Law 16,525 was sanctioned, enacted and published; it provides for the corporate reorganization
of Companhia de Saneamento Básico de São Paulo - SABESP and sets forth other provisions.

The main provisions of the Law are:

·  The Executive branch is authorized to establish a corporation, governed by Federal Law 6,404/76, to hold basic sanitation

and other assets, whose exploration relates to its main purpose ("Parent Company");

·  The objective of the Parent Company is, among others:

(i)   Control SABESP;

The accompanying notes are an integral part of these financial statements.
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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(ii)  Hold  the  ownership,  manage  and  explore  assets  of  any  nature,  aiming  the  universalization  and  efficiency  of  basic

sanitation services in the State of São Paulo;

(iii)   Structure and implement funding operations to strengthen its ability to execute strategies and initiatives in the basic

sanitation sector;

(iv)    Assist the State of São Paulo and other federal entities in the implementation of public policies in the basic sanitation

sector;

(v) Explore  other  business  opportunities  related  to  the  basic  sanitation  sector  inside  and  outside  the  State  of  São  Paulo,

supported by SABESP;

(vi)    Use legally appropriate contractual and corporate arrangements to fulfill its corporate purpose, including the creation
of  wholly-owned  subsidiaries,  formation  of  consortia  and  holding  interests  in  other  public  or  private  companies,
provided that approved by the Board of Directors.

·  The Government will hold ownership of most of the common shares of the Parent Company; other shareholders may also

hold minority interests in the Parent Company;

·   Private shareholders will be allowed in the Parent Company in order to contribute capital, add value to the business and
strengthen the Company’s and the Parent Company’s corporate governance, provided that they do not restrict the capacity
of the São Paulo State Government to guide them in the attainment of the public interest that justified their creation;

·  The São Paulo State Government is authorized to pay-in its interest in the Parent Company’s capital through the transfer of

the shares it holds in SABESP;

·   The  Parent  Company  and  SABESP  may  acquire  shares  from  other  state-owned  or  private  companies  that  have  potential

synergy with SABESP’s activities;

·  The Parent Company may increase SABESP’s capital to pay-in in cash or with assets, inclusive by holding a tender offer in

the capital market; and

·    The  São  Paulo  State  Government  is  authorized  to  sell  or  encumber  the  Parent  Company’s  shares  or  its  respective

subscription rights, provided that the ownership of most of the common shares is maintained;

·    The  State  Government  may  waive  its  preemptive  right  to  subscribe  to  shares  in  future  capital  increases  of  the  Parent

Company, in order to enable contributions from new shareholders without losing its the control;

·    The  São  Paulo  State  Government  will  mandatorily  allocate  at  least  30%  of  the  proceeds  from  the  sale  of  the  Parent

Company’s shares to investments in basic sanitation projects;

·   A management agreement will be entered into by the São Paulo State Government, the Parent Company and SABESP to

strengthen the companies’ administrative and financial efficiency;

The accompanying notes are an integral part of these financial statements.
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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i)       The execution of the management agreement will be preceded by the assumption of SABESP’s control by the Parent Company
and  will  establish  performance  targets  related  to  the  reduction  of  water  losses  and  the  universalization  of  basic  sanitation
services provided by SABESP;

(ii)     The management agreement will also provide for the increase in the companies’ managerial autonomy regarding:

-       the definition of a personnel policy;

-       procedures for bids and the contracting of suppliers and service providers;

-       cash management, treasury operations, bank payments of salaries and suppliers; and

-       autonomy for the general shareholders’ meeting to establish the salaries and other types of compensation to members of

management, based on the limits and parameters established in the management agreement;

(iii) The agreement will be valid for five years, but may be renegotiated and successively renewed.

The financial statements were approved by Management on April 26, 2018.

2             Basis of preparation and presentation of the financial statements

The financial statements of the Company have been prepared in accordance with the International Financial Reporting Standards
–  IFRS  as  issued  by  the  International  Accounting  Standards  Board  –  IASB.  All  material  information  related  to  the  financial
statements,  and  this  information  alone,  is  being  disclosed  and  corresponds  to  the  information  used  by  the  Company’s
Management in its administration.

The financial statements have been prepared under the historical cost except for certain financial instruments measured at fair
value when required by the standards.

The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates.  It also
requires Management to exercise its judgment in the process of applying the Company's accounting policies.  The areas involving
a higher degree to judgment or complexity, or areas where assumptions and estimates are significant to the financial statements
are described in Note 6.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

3    Summary of Significant Accounting Policies

The main accounting policies applied in the preparation of these financial statements are defined below.  These policies have been
applied consistently in all years presented.

3.1  Cash and cash equivalents

Cash and cash equivalents include cash in hand, bank deposits, overdraft accounts and other short-term highly liquid investments
with original maturities less than three months as of the investment date, with an insignificant risk of changing value.

       3.2  Financial assets and liabilities

Financial Asset - Classification

The  Company  classifies  its  financial  assets  according  to  the  following  categories:  measured  at  fair  value  through  profit  or  loss,
borrowings  and  receivables,  held-to-maturity  and  available  for  sale.    The  classification  depends  on  the  purpose  for  which  the
financial assets were acquired.  Management determines the classification of the financial assets at inception.   As of December 31,
2017 and 2016, the Company did not have financial assets classified under the fair value through profit or loss, held-to-maturity
and available- for-sale financial instruments  category.

·    Borrowings and receivables

These comprise receivables, which are non-derivative financial assets with fixed or determinable payments, not quoted in an
active market.  Borrowings and receivables are presented in current assets, except for those with maturity of more than 12
months  after  the  reporting  date  (these  are  classified  as  noncurrent  assets).    The  Company's  borrowings  and  receivables
include cash and cash equivalents, restrict cash, balances of trade receivables, accounts receivable from related parties, other
receivables, receivables from the Water National Agency – ANA.  Borrowings and receivables are recorded at fair value and
subsequently at amortized cost, under the effective interest rate method.

Financial Liabilities - Classification

The Company classifies its financial liabilities into the following categories: measured at fair value through profit or loss and other
liabilities.  Classification depends on the purpose to which the financial liabilities were assumed.  As of December 31, 2017 and
2016, the Company did not have liabilities classified into the “fair value through profit or loss” category.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

·    Other liabilities

This category comprises balances payable to contractors and suppliers, borrowings and financing, services payable, balances
payable from public-private partnership (PPP), and program contract commitments.

The effective interest rate method is adopted to calculate the amortized cost of a financial liability and allocate its interest
expense under the respective period.  The effective interest rate exactly deducts the estimated future cash flows (including
fees, transaction costs and other issue costs) throughout the financial liability’s estimated life or, when appropriate, during a
shorter period, for initial recognition of the net carrying amount.

3.3  Operating income

(a)         Revenue from sanitation services

Revenue  from  sanitation  services  are  recognized  as  the  water  is  consumed  and  services  are  provided.    Revenues,  including  the
revenues  unbilled,  are  recognized  at  the  fair  value  of  the  consideration  received  or  receivable  for  the  sale  of  those  services.
Revenue  is  shown  net  of  value-added  tax  and  fees,  rebates  and  discounts.    Unbilled  revenues  represent  incurred  revenues  in
which the services were provided, but not yet billed until the end of the each period and are recorded as trade receivables based on
monthly estimates of the completed services.  Concerning revenues of wholesale municipal governments, which do not pay the full
invoice, the Company establishes an allowance for doubtful accounts upon invoicing in revenue reduction account.

The  Company  recognizes  revenue  when:  i)  products  are  delivered  or  services  are  rendered;  ii)  the  amount  of  revenue  can  be
reliably measured, iii) it is probable that future economic benefits will flow to the Company and iv) it is probable that the amounts
will be collected.  The amount of revenue is not considered to be reliably measurable until all conditions relating to the sale have
been satisfied.  Amounts in dispute are recognized as revenue when collected.

(b)         Construction revenue

Revenue from concession construction contracts is recognized in accordance with IFRIC 12 (Service Concession Arrangements)
and  IAS  11  (Construction  Contracts),  using  the  percentage-of-completion  method,  provided  that  the  applicable  conditions  for
application  are  fulfilled.    The  percentage  of  completion  is  calculated  from  the  ratio  of  the  actual  costs  incurred  on  the  balance
sheet date to the planned total costs (cost-to-cost method).  Revenue from cost plus contracts is recognized by reference to the
construction  costs  incurred  during  the  period  plus  a  fee  earned.  The  fee  represents  the  additional  margin  related  to  the  work
performed  by  the  Company  in  relation  to  such  construction  contracts  and  it  is  added  construction  costs,  resulting  in  the
construction revenue.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

3.4  Trade receivables and allowance for doubtful accounts

Trade receivables are amounts due from customers for services performed in the ordinary course of business.  These are classified
as  current  assets,  except  when  maturity  exceeds  12  months  after  the  end  of  the  reporting  period.    In  these  cases,  they  are
presented as noncurrent assets.

The Company establishes an allowance for doubtful accounts for receivable balances at an amount that Management considers to
be  sufficient  to  cover  eventual  losses.  The  analysis  is  carried  out  based  on  objective  accounts  receivable  data,  past  receipts  and
existing guarantees and it does not expect to incur additional significant losses.

3.5  Inventories

Inventories of supplies for consumption and maintenance of the water and sewage systems are stated at the lower of average cost
of acquisition or net realizable value, and are classified in current assets.

3.6  Investment properties

The investment properties are recorded at the acquisition or construction cost, less accumulated depreciation, except for the land
group,  calculated  by  the  straight-line  method  at  rates  that  consider  the  estimated  useful  life  of  assets.    Expenditures  related  to
repairs and maintenance are recorded in the income statement when incurred.

The Company also maintains few assets for undetermined use in the future, i.e., it is not defined if the Company will use these
assets in the operation or sell them in the short term during the ordinary course of business.

3.7  Property, plant and equipment

Property,  plant  and  equipment  comprise  mainly  administrative  facilities  not  composing  the  assets,  subject-matter  of  the
concession agreements.  Those assets are stated at historical acquisition or construction cost less depreciation, net of impairment
charge,  when  necessary.    Interest,  other  finance  charges  and  inflationary  effects  deriving  from  financing  effectively  applied  to
construction in progress are recorded as cost of respective property, plant and equipment, in this case, for the qualifying assets.
Qualifying  assets  are  assets  that,  necessarily,  take  a  substantial  period  to  get  ready  for  its  intended  use  or  sale.  The  Company
considers  that  substantial  period  means  a  period  greater  than  12  months.    This  period  was  established  by  considering  the
completion period of the majority of its constructions, which is greater than 12 months, which corresponds to one fiscal year of
SABESP.

Subsequent costs included in the existing asset's carrying amount or recognized as a separate asset, as appropriate, only when it is
probable  that  the  future  economic  benefit  associated  with  the  item  will  flow  to  the  Company  and  the  cost  of  the  item  can  be
measured reliably.  Repairs and maintenance are charged to the income statement during the financial period in which they were
incurred.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Depreciation  is  calculated  using  the  straight-line  method  to  allocate  their  cost  and  is  described  in  Note  15(c).  Lands  are  not
depreciated.

Residual values and the useful life of assets are revised and adjusted, where applicable, at the end of each year.

Gain and losses on disposals are determined by the difference between the proceeds with the carrying amount and are recognized
within other operating income (expenses) in the income statement.

3.8  Intangible assets

Intangibles are stated at acquisition cost and/or construction of the underlying assets, including construction margin, interest and
other finance charges capitalized during the construction period, in this case, for the qualifying assets. Qualifying assets are assets
that, necessarily, take a substantial period to get ready for its intended use or sale. The Company considers that substantial period
means a period greater than 12 months.  This period was established by considering the completion period of the majority of its
constructions, which is greater than 12 months, which corresponds to one fiscal year of SABESP. 

The  intangible  has  its  amortization  initiated  when  the  intangible  assets  are  available  for  use  in  location  and  the  necessary
condition when this asset becomes operational.

 The amortization of intangible assets reflects the period over the expected future economic benefits generated by the intangible
asset are consumed by the Company and can be the period of the contract or the useful life of the asset.

The amortization of the intangible assets is discontinued when the asset is totally consumed or it is disposed of, whatever occurs
first.

Donations  in  assets,  received  from  third  parties  and  governmental  entities,  to  allow  the  Company  to  render  water  and  sewage
services are not recorded in the Company’s financial statements, since these assets are controlled by the concession grantor.

Financial resources received as donations for the construction of infrastructure are recorded under “Other operating income”.

(a)         Concession arrangements/program

The  Company  operates  concession  agreements  including  the  rendering  of  basic  sanitation,  environmental,  water  supply  and
sewage  services  signed  with  the  concession  grantor.    The  infrastructure  used  by  SABESP  subject  to  service  concession
arrangements is considered to be controlled by the concession grantor when:

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i)        The grantor controls or regulates what services the operator must provide with the infrastructure, to whom it must provide

them, and at what price;  and

(ii)       The grantor controls the infrastructure, i.e., retains the right to take back the infrastructure at the end of the concession.

SABESP's rights over infrastructure operated under concession arrangements is accounted for as an intangible asset as SABESP
has the right to charge for use of the infrastructure assets, and users (consumers) have the primary responsibility to pay SABESP
for the services.

The  fair  value  of  construction  and  other  work  on  the  infrastructure  is  recognized  as  revenue,  as  its  fair  value,  when  the
infrastructure  is  built,  provided  that  this  work  is  expected  to  generate  future  economic  benefits.    The  accounting  policy  to
recognize construction revenue is described in Note 3.3.

Intangible assets related to Concession agreements and Program contracts, when there is no right to receive the residual value of
the assets at the end of the contract, are amortized on a straight-line basis over the period of the contract, or the useful life of the
underlying asset, whichever occurs first.

Investments made and not recovered through rendering of services, when there is right to receive the residual value of the assets
at the end of the contract , must be indemnified by the concession grantor, (1) with cash or cash equivalents or also, in general (2)
with the contract extension.  These investments are amortized by the useful life of asset.

The details referring to amortization of intangible arising from concession arrangements/programa are described in Note 14 (d).

Law  11,445/07  indicates,  whenever  possible,  that  basic  sanitation  public  utilities  will  have  the  economic  and  financial
sustainability ensured through the remuneration due to service collection, preferably as tariffs and other public prices, which may
be established for each service or both jointly.  Therefore, investments made and not recovered through services rendered, within
original  term  of  the  contract,  are  recorded  as  intangible  assets  and  amortized  by  the  useful  life  of  the  asset,  taking  into
consideration a solid track record of concession renewal and, therefore, the continuity of services.

(b)         Software licenses

Software  licensing  is  capitalized  based  on  the  acquisition  costs  and  other  implementation  costs.    Amortizations  are  recorded
according to the useful lives and the expenses associated with maintaining these are recognized as expenses when incurred.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

3.9  Impairment of non-financial assets

Property,  plant  and  equipment,  intangibles  and  other  noncurrent  assets  with  definite  useful  lives,  are  yearly  reviewed  for
impairment  whenever  events  or  changes  in  circumstances  indicate  that  the  carrying  amount  may  not  be  recoverable.    The
Company does not record assets with indefinite useful life and assessed that there are no indications of impairment losses, mainly
supported  by  Law  11,445/07,  which  ensures  that  basic  sanitation  public  utilities  will  have  assured  its  economic  and  financial
sustainability through tariffs or via indemnity.

3.10  Trade accounts payable and contractors

Accounts  payable  to  contractors  and  suppliers  are  obligations  to  pay  for  goods  or  services  purchased  from  suppliers  in  the
ordinary course of business and are classified as current liabilities if the payment is due in the period up to one year. Otherwise,
the accounts payable are presented as noncurrent liabilities and are initially measured at fair value, which generally correspond to
the bill and subsequently at amortized cost.

3.11  Borrowings and financing

Borrowings  are  initially  recognized  at  fair  value,  upon  receipt  of  funds,  net  of  transaction  costs.    Subsequently,  borrowings  are
stated  at  amortized  cost,  as  presented  in  Note  16.    Borrowings  and  financing  are  classified  as  current  liabilities  unless  the
Company has an unconditional right to defer settlement of the liability for at least 12 months after the end of the reporting period.

Nonconvertible bonds issued by the Company are recognized in a similar manner to borrowings.

3.12  Borrowing costs

Borrowing costs attributable to acquisition, construction or production of an asset, which, necessarily, requires a substantial time
period  to  be  ready  for  use  or  sale  are  capitalized  as  part  of  the  cost  of  these  assets.    Other  borrowing  costs  are  recognized  as
expenses in the period they are incurred.  Borrowing costs are interest rates and other charges incurred by the Company related to
loans, including exchange variation, as described below.

The  capitalization  occurs  during  the  period  in  which  the  asset  has  been  built,  considering  the  weighted  average  rate  of  loans
effective on the capitalization date.

For  foreign  currency-denominated  loans  or  financing,  the  Company  analyzes  them  as  if  they  were  contracted  in  local  currency,
restricting  the  capitalization  of  interest  and/or  exchange  variation  by  the  amount  that  would  be  capitalized  if  these  were
contracted in the domestic market in similar lines of credit and loans.

3.13  Payroll, related charges and contributions

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Salaries, vacations and the 13th salary and additional payments negotiated in collective labor agreements plus related charges and
contributions are recorded on the accrual basis.

3.14  Profit sharing

The profit sharing plan for its employees is based on operational and financial targets of the Company as a whole.  The Company
recognizes  a  provision  when  it  is  contractually  required  or  when  there  is  a  practice  in  the  past  that  created  a  constructive
obligation.  The  accrual  for  profit  sharing  is  recorded  on  the  accrual  basis  period  as  operating  cost,  selling  and  administrative
expenses.

3.15  Provisions, legal liabilities, escrow deposits and contingent assets

Provisions related to claims are recognized when: i) the Company has a present (legal or constructive) obligation as a result of past
event; ii) it is probable that an outflow of resources that comprise economic benefits will be required to settle the obligation; and
iii) the amount can be reliably estimated.  Where there are a number of similar obligations, the likelihood that an outflow will be
required in settlement is determined by considering the class of obligations as a whole.

Provisions are measured at the present value of the disbursements expected to be required to settle the obligation using a pre-tax
rate that reflects current market assessments of the time value of money and the risks specific to the obligation.  The increase in
the provision due to passage of time is recognized as interest expense.

For financial statement presentation purposes, the provision is stated net of the related escrow deposits based on the legal right to
offset.  The bases and the nature of the provisions for civil, tax, labor and environmental risks are described in Note 19.

Escrow deposits not linked to related liabilities are recorded in noncurrent assets. Escrow deposits are adjusted for inflation.

Contingent assets are not recognized in the statements of financial position.

3.16  Environmental costs

Costs related to ongoing environmental programs are expensed in the income statement, when there is any indication of an event. 
Ongoing programs are designed to minimize the environmental impact of the operations and to manage the environmental risks
inherent to the Company's activities.

F-22

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

3.17  Income taxes – current and deferred

Income taxes expenses comprise current and deferred income tax and social contributions.

Current tax

The provision for income tax and social contribution is based on the taxable income for the year.  The income tax was accrued at
rate 15%, plus 10% surtax on taxable income exceeding R$ 240.  The social contribution was accrued at rate 9% over adjusted net
income.    Taxable  income  differs  from  net  income  (profit  presented  in  the  income  statement),  because  it  excludes  income  and
expenses  taxable  or  deductible  in  other  years,  and  excludes  items  not  permanently  taxable  or  not  deductible.    Income  tax  and
social  contribution  are  accrued  based  on  legislation  in  place  in  the  end  of  the  year.    Management  periodically  evaluates  and
measures the positions taken in the income tax return with respect to situations in which applicable tax regulations are subject to
interpretation.  It establishes provisions where appropriate on the basis of amounts expected to be paid to the tax authorities.

Deferred tax

Deferred income tax is recognized, using the liability method, on temporary differences arising between the tax basis of assets and
liabilities and their carrying amounts in the financial statements, according to IAS 12. However, the deferred income tax is not
accounted for if it arises from initial recognition of an asset or liability in a transaction that at the time of the transaction affects
neither  accounting  nor  taxable  profit  nor  loss,  except  for  business  combinations.    Deferred  income  tax  is  determined  using  tax
rates (and laws) effective at the end of the reporting period and expected to apply when the related deferred income tax asset is
realized or the deferred income tax liability is settled.

Deferred income tax and social contribution assets are recognized only to the extent that it is probable that future taxable profit
will be available for which temporary differences can be utilized and tax losses can be carryforward.

Deferred  taxes  assets  and  liabilities  are  offset  when  there  is  a  legally  enforceable  right  of  offsetting  current  tax  assets  against
current tax liabilities and when deferred income tax assets and liabilities are related to income taxes levied by same tax authority
over the tax entity.

F-23

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

3.18  Taxes on revenues

Revenues from water and sewage services are recognized on accrual basis for PASEP and Cofins, calculated at the rates of 1.65%
and 7.60%, respectively.  Taxes levied on billed amounts to public entities are due when bills are received.

In  addition,  revenues  from  sanitation  services  are  also  subject  to  the  Regulatory,  Control  and  Inspection  Fee  (TRCF  -  Taxa  de
Regulação,  Controle  e  Fiscalização), whose  taxable  event  is  the  performance  of  regulation,  control  and  monitoring  activities  by
ARSESP, calculated at 0.50% of the annual revenue directly generated by the service provided less taxes levied on the service.

The taxes related to PASEP and Cofins incident on amounts invoiced to public entities are due when invoices are received.

As  these  taxes  are  calculated  by  the  non-cumulativeness  regime  and  presented  net  of  tax  credits,  as  deductions  from  gross
revenues.    Debts  measured  on  “other  operating  income”  are  presented  as  deductions  from  the  respective  operating  income  or
expense.

3.19  Pension obligations

(a)      Defined benefit

The Company makes contributions to defined benefit plans on a contractual basis and sponsored thereby, managed by Fundação
Sabesp  de  Seguridade  Social  (“Sabesprev”),  a  supplementary  private  pension  closely-held  entity.    The  regular  contributions
comprise the net administrative expenses and are recognized in the income statement for the period.

Liabilities from defined benefit pension plan obligations correspond to the present value of the defined benefit obligation at the
end of the reporting period, less the fair value of the plan’s assets.  The defined benefit obligation (G1) and (G0) are calculated on
an  annual  basis  by  independent  actuaries,  using  the  projected  unit  credit  method.    The  estimated  future  cash  outflows  is
discounted to its present value, using the interest rates of Government bonds with maturities that approximate the maturity of the
related liability.

Referring to actuarial gains and losses deriving from adjustments based on the experience and changes in actuarial assumptions
are directly recorded under equity, as other comprehensive income (OCI), so that the plan's net assets or liabilities are recognized
in the statement of financial position in order to reflect the full amount of plan’s deficit or surplus.

The  expenses  related  to  pension  plan  are  recognized  in  profit  and  loss  of  the  year  as  operating  cost,  selling  expenses  or
administrative expenses, according to employee’s allocation.

F-24

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

In an event where a curtailment relates to only some of the employees covered by a plan, or where only part of an obligation is
settled, the gain or loss includes a proportionate share of the past service cost and actuarial gains and losses.  The proportionate
share is determined on the basis of the present value of the obligations before and after the curtailment or settlement.

(b)      Defined contribution

The Company makes contributions to defined contribution plans (Sabesprev Mais) on a contractual basis and sponsored thereby,
managed  by  Sabesprev,  a  supplementary  private  pension  closely-held  entity  that  provides  post-employment  benefits  to  its
employees.

A defined contribution plan is a pension plan according to which the Company makes fixed contributions to a separate entity.  The
Company has no obligation of making contributions if the fund has no sufficient funds to pay to all employees the benefits related
to employee’s services in current and previous period.

3.20  Financial revenues and expenses

Financial  revenue  is  primarily  comprised  of  interest,  inflation  adjustments  and  exchange  rate  changes  resulting  from  financial
investments, escrow deposits and negotiations with customer to pay by installments, using the effective interest rate method.

Financial  expenses  are  primarily  comprised  of  interest,  inflation  adjustments  and  exchange  rate  changes  on  borrowings  and
financing, provisions, public-private partnership and program contract commitmentsz’. These financial income and expenses are
calculated using the effective interest rate method.

Inflation  adjustments  and  exchange  gains  and  losses  derive  from  the  collection  or  payment  to  third  parties,  as  contractually
required  by  law  or  court  decision,  and  recognized  on  an  accrual  basis  pro  rata  temporis.  Inflation  adjustments  included  in  the
agreements  are  not  considered  embedded  derivatives,  since  they  are  deemed  as  inflation  adjustment  rates  for  the  Company’s
economic scenario.

3.21  Leases

Lease agreements are classified as finance lease when property, risks and rewards inherent to the ownership of asset to the lessee
are transferred.  Other leases are classified as operational lease, recognized as expenses in the income statement on a straight-line
basis during the lease term.

Finance lease agreements are measured based on the lower amount between the present value of minimum mandatory payments
of  the  agreement  or  the  fair  value  of  asset  on  the  start  date  the  lease  agreement.  The  amounts  payable  deriving  from
considerations of finance lease agreements are impacted by financial expenses and amortization of finance lease payables so that
to obtain a constant interest rate.  The corresponding lessor’s liability is recorded as current and noncurrent debt.

F-25

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

3.22  Other current and noncurrent assets and liabilities

Other  assets  are  stated  at  cost  of  acquisition,  net  of  any  impairment  loss,  where  applicable.  The  amounts  recognized  as  other
liabilities are stated at known or estimated amounts, including, where applicable, related charges and inflation adjustments.

3.23  Dividends and interest on capital

The  Company  uses  the  tax  benefits  of  distributing  dividends  as  interest  on  capital,  as  permitted  by  Brazilian  Law.    This
distribution of dividend is accounted for in accordance with Brazilian Law 9,249/95 for tax deductibility purposes, limited to the
daily pro rata fluctuation of the Long-term Interest Rate (TJLP).  The benefit attributed to the shareholders is recognized in the
current liability against Equity, based on its by-laws.  Dividends and interest on capital over the minimum established in the by-
laws are recognized when approved by the shareholders in the shareholders’ meeting, except for taxes incurring in the distribution
of interest on capital. The tax benefit of the interest on capital are accrued in the income statement of the year, under the same
recognition basis of expenses with interest on capital.

3.24  Present value adjustment

Current and noncurrent financial assets and liabilities are adjusted to present value based on discount rate at current market rate
as of the transaction date, when the effects are relevant.

3.25  Segment information

Operating segments are determined in a manner consistent with the internal reporting to the Company’s chief operating decision
maker (“CODM”), which, in the case of SABESP, is the Board of Executive Officers, to make strategic decisions, allocate resources
and evaluate performance.

Consequently, the Company determined that it has one operating segment (sanitation services).

The accounting policies used to determine segment information are the same as those used to prepare the Company’s financial
statements.

The measure of the segment’s profit or loss is operating income before other operating expenses, net and equity accounting, which
excludes construction revenue and related costs.

The  CODM  analyzes  asset  and  liabilitity  information  on  a  consolidated  basis.  Consequently,  the  Company  does  not  disclose
segment information on assets and liabilities.

F-26

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Substantially  all  of  the  Company’s  noncurrent  assets  and  revenue  generated  from  customers  are  located  in  São  Paulo  State.
Consequently, financial information is not disclosed by geographic area.

3.26  Translation into foreign currency

(a)      Functional and reporting currency

Items included in the financial statements are measured using the currency of the primary economic environment in which the
company  operates  ("the  functional  currency").  The  financial  statements  are  presented  in  Brazilian  reais  (R$),  which  is  also  the
Company's functional currency. All financial information has been stated in reais and rounded to the next thousand, except where
otherwise indicated.

(b)      Foreign currency translation

Foreign  currency-denominated  transactions  are  translated  into  Brazilian  reais  using  the  exchange  rates  prevailing  at  the
transaction dates.  Statement of financial position accounts are translated by the exchange rate prevailing at reporting date. 

Exchange  gains  and  losses  resulting  from  the  settlement  of  these  transactions  and  the  translation  of  foreign  currency-
denominated cash assets and liabilities are recognized in the income statement, except for borrowings and financing referring to
property, plant and equipment or intangible assets in progress, where exchange losses are recognized as corresponding entry to
the asset while construction is in progress, as described in Note 3.12.

F-27

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

4             Changes in accounting practices and disclosures

4.1  New standards, amendments and interpretations effective for periods beginning on or after January 1, 2017

New standards and revisions

Standard

Description

Impact

Amendments to IAS 12 –
Recognition of Deferred
Income Tax for Unrealized
Losses

Describes about the treatment of temporary differences.

Amendments to IAS 7 –
Disclosure Initiatives

Describes about disclosures that enable users to measure
the changes in liabilities related to financing activities.

Annual improvements to
IFRSs: 2015-2017 cycle

Amendments to IFRS 12 – Disclosure of interests in other
entities – clarification on the standard’s scope.

The application of this amendment
did not impact the disclosures or
amounts recognized in the annual
financial statements.

The application of these amendments
did not impact the disclosures or
amounts recognized in the annual
financial statements.

The application of this amendment
did not impact the disclosures or
amounts recognized in the annual
financial statements.

F-28

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

4.2 New standards, amendments and interpretations to existing standards that are not yet effective 

The  Company  did  not  early  adopt  these  standards  and  is  assessing  the  impacts  of  the  new  and  revised  IFRS  below  on  the
disclosures or amounts recognized in the financial statements:

Standard

Description

Impact

IFRS 9 - Financial
Instruments1

Changes in the classification and measurement
requirements, mainly for impairment and hedge
accounting.

Establishes a single comprehensive framework to
determine if and when a revenue is recognized and how
revenue is measured.

IFRS 15 will supersede the current revenue recognition
guidance including IAS 18 Revenue, IAS 11 Construction
Contracts and IFRIC 13 Interpretation A – Customer
Loyalty Programmes.

Establishes a single model for the accounting of leases in
the balance sheet for lesses. A lessee recognizes a right of
use asset that represents his right to use the leased asset
and a lease liability that represents his obligation to make
lease payments. The lessor's accounting remains similar to
the current standard, that is, the lessors continue to
classify the leases as financial or operating.

IFRS 16 will supersede the current leases guidance
including IAS 17 Leases and IFRIC 4, SIC 15 and SIC 27
Determining Whether an Arrangement Contains a Lease.

Describe about modifications of settled options of shares.

IFRS 15 - Revenue from
Contracts with
Customers1

IFRS 16 – Leases2

Amendments to IFRS 2 –
Classification and
measurement of share-
based payment
transactions2

F-29

The Company assessed the main
aspects of this and has concluded
that will not have an impact on
the classification and
measurement of losses on its
financial assets and financial
liabilities or hedge accounting,
given that it does not have any
operation of this nature.

The Company assessed the
impacts on its customer
contracts, including those with
consumers with special billing
characteristics, and concluded
that the adoption of this standard
will not have material impacts.

The Company is assessing the
effects of recording operating
leases in its financial statements
and expects impacts which are
currently under evaluation.

The Company is assessing the
impacts and effects of the
amendments, however it does not
expect material effects from
adopting this standard.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

1 Effective for annual periods beginning on or after January 1, 2018.
2 Effective for annual periods beginning on or after January 1, 2019.

There  are  no  other  standards  and  interpretations  not  yet  adopted  that  may,  in  the  opinion  of  Management,  have  a  significant
impact on the result for the year of equity disclosed by the Company in its financial statements.

5             Risk Management

5.1  Financial Risk Management

Financial risk factors

The  Company's  activities  are  affected  by  Brazilian  economic  scenario,  making  it  exposed  to  market  risk  (exchange  rate  and
interest  rate),  credit  risk  and  liquidity  risk.  The  Company’s  financial  risk  management  is  focused  on  the  unpredictability  of
financial markets and seeks to minimize potential adverse effects on the Company’s financial performance.

The Company has not utilized derivative instruments in any of the reported periods.

(a)       Market risk

Foreign currency risk

SABESP’s foreign exchange exposure implies market risks associated with currency fluctuations, since the Company has foreign
currency-denominated liabilities, mainly US dollar and yen-denominated short and long-term borrowings.

The  management  of  SABESP’s  foreign  currency  exposure  considers  several  current  and  projected  economic  factors,  besides
market conditions.

F-30

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

This  risk  arises  from  the  possibility  that  the  Company  may  incur  in  losses  due  to  exchange  rate  fluctuations  that  would  impact
liability balances of foreign currency-denominated borrowings and financing raised in the market and related financial expenses.
The Company does not maintain hedge or swap contracts or any derivative financial instrument to hedge against this risk.

A significant amount of the Company’s financial debt is indexed to the U.S. dollar and Yen, in the total amount of R$ 5,702,375 as
of December 31, 2017 (R$5,692,984 as of December 31, 2016). Below, the Company’s exposure to exchange risk:

December 31, 2017
Foreign
currency

R$

December 31, 2016

Foreign
currency

R$

Borrowings and financing – US$

Borrowings and financing – Yen

1,200,786

3,972,200

1,241,963

4,047,682

57,575,271

1,692,713

57,643,930

1,609,419

Interest and charges from borrowings and financing – US$

Interest and charges from borrowings and financing – Yen

Total exposure

Borrowing cost – US$

Borrowing cost – Yen

Total foreign currency-denominated borrowings (Note 16)

26,628

10,834

5,702,375

(26,454)

(3,100)

5,672,821

25,114

10,769

5,692,984

(29,650)

(2,971)

5,660,363

The 0.2% increase in foreign currency-denominated debt from December 31, 2016 to December 31, 2017 was mainly due to the
following:

1)         A 1.5% increase in the US dollar, from R$3.2591 as of December 31, 2016 to R$3.3080 as of December 31, 2017. The US

dollar-denominated debt accounts for 70.0% of foreign currency-denominated debts; and

2)         A 5.3% increase in the Yen-denominated, from R$0.02792 as of December 31, 2016 to R$0.02940 as of December 31,

2017.

As of December 31, 2017, if the Brazilian real had depreciated or appreciated by 10%, in addition to the impacts mentioned above,
against the US dollar and Yen with all other variables held constant, effects on results before taxes on the year would have been
R$570,238  (R$569,298  as  of  December  31,  2016),  lower  or  higher,  mainly  as  a  result  of  exchange  losses  or  gains  on  the
translation of foreign currency-denominated loans.

F-31

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Interest rate risk

This  risk  arises  from  the  possibility  that  the  Company  could  incur  losses  due  to  fluctuations  in  interest  rates,  increasing  the
financial expenses related to borrowings and financing.

The  Company  has  not  entered  into  any  derivative  contract  to  hedge  against  this  risk;  however  continually  monitors  market
interest rates, in order to evaluate the possible need to replace its debt.

The table below provides the Company's borrowings and financing subject to variable interest rate:

December 31, 2017

December 31, 2016

TR(i)
CDI(ii)
TJLP(iii)
IPCA(iv)
LIBOR(v)

Interest and charges

Total

1,574,564

1,144,391

1,354,987

1,699,747

2,814,399

125,172

8,713,260

1,535,030

1,082,228

1,326,631

1,697,452

2,906,999

142,644

8,690,984

(i) TR – Interest Benchmark Rate
(ii) CDI – (Certificado de Depósito Interbancário), an interbank deposit certificate
(iii) TJLP – (Taxa de Juros a Longo Prazo), a long-term interest rate index
(iv) IPCA – (Índice Nacional de Preços ao Consumidor Amplo), a consumer price index
(v) LIBOR – London Interbank Offered Rate

Another risk to which the Company is exposed, is the mismatch of the monetary restatement indices of its debts with those of its
service revenues. The tariff adjustments of the Company’s services provided do not necessarily follow the increases in the inflation
indexes to adjust loans, financing and interest rates affecting indebtedness

As of December 31, 2017, if interest rates on borrowings and financing had been 1 percentage point higher or lower with all other
variables held constant, the effects on profit for the year before taxes would have been R$ 87,133 
(R$  86,910  as  of  December  31,  2016)  lower  or  higher,  mainly  as  a  result  of  a  lower  or  higher  interest  expense  on  floating  rate
borrowings and financing.

(b)      Credit risk

Credit  risk  arises  from  cash  and  cash  equivalents,  deposits  in  banks  and  financial  institutions,  as  well  as  credit  exposures  to
wholesale  basis  and  retail  customers,  including  outstanding  accounts  receivable,  restricted  cash  and  accounts  receivable  from
related parties. Credit risk exposure to customers is mitigated by sales to a dispersed base.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

The  maximum  exposures  to  credit  risk  as  of  December  31,  2017  are  the  carrying  amounts  of  instruments  classified  as  cash
equivalents, deposits in banks and financial institutions, restricted cash, trade receivables and accounts receivable from related
parties in the balance sheet date.  See additional information in Notes 7, 8, 9 and 10.

Regarding the financial assets held with financial institutions, the credit quality that is not past due or subject to impairment can
be  assessed  by  reference  to  external  credit  ratings  (if  available)  or  to  historical  information  about  the  banks’  default  rates.  The
credit  quality  of  the  banks,  such  as  deposits  and  financial  investments,  the  Company  considers  the  lower  rating  of  the
counterparty  published  by  three  main  international  rating  agencies  (Fitch,  Moody's  and  S&P),  according  to  internal  policy  of
market risk management:

Cash at bank and short-term bank deposits

AA+(bra)

AAA(bra)

Other (*)

December 31, 2017

December 31, 2016

2,222,001

43,978

17,068

2,283,047

1,850,220

35,452

549

1,886,221

(*) This category includes current accounts and investment funds in banks whose balances were not significant.

The available credit rating information of the banks, as at December 31, 2017, in which the Company made deposit transactions
and financial investments in domestic currency (R$ - domestic rating) during the year is as follows:

Banks

Banco do Brasil S/A

Banco Santander Brasil S/A

Caixa Econômica Federal

Banco Bradesco S/A

Itaú Unibanco Holding S/A

(c)  Liquidity risk

Fitch

AA+(bra)

-

AA+(bra)

AAA(bra)

AAA(bra)

Moody's

Standard Poor's

Aa1.br

Aaa.br

Aa1.br

Aa1.br

Aa1.br

-

brAA-

brAA-

brAA-

brAA-

The  Company's  liquidity  is  primarily  reliant  upon  cash  provided  by  operating  activities,  loans  from  Brazilian  Federal  and  State
governmental  financial  institutions,  and  financing  in  the  domestic  and  international  capital  markets.    The  liquidity  risk
management  considers  the  assessment  of  its  liquidity  requirements  to  ensure  it  has  sufficient  cash  to  meet  its  operating  and
capital expenditures needs, as well as the payment of debts.

F-33

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

The  funds  held  by  the  Company  are  invested  in  interest-bearing  current  accounts,  time  deposits  and  securities,  selecting
instruments with appropriate maturity or liquidity sufficient to provide margin as determined by projections mentioned above.

The table below shows the financial liabilities of the Company, by relevant maturities, including the installment of principal and
future interest to be paid according to the agreement.

2018

2019

2020

2021

2022

2023
onwards

Total

As of December 31, 2017

Liabilities

Borrowings and financing

2,221,645

2,321,046

2,648,021

1,134,162

1,077,914

5,534,627

14,937,415

Accounts payables to suppliers and contractors

Services payable

344,947

408,275

-

-

-

-

-

-

-

-

-

-

344,947

408,275

Public-Private Partnership – PPP (*)

185,816

368,156

368,156

368,156

368,156

5,148,952

6,807,392

Program contract commitments

128,820

92,505

15,639

15,779

1,029

15,981

269,753

(*)  The  Company  also  considered  future  commitments  (construction  not  yet  performed)  still  not  recognized  in  the  financial
statements related to São Lourenço PPP, due to the relevance of future cash flows, the impacts on its operations and the fact the
Company already has formalized this commitment through an agreement signed by the parties.

Future interest

Future interest were calculated based on the contractual clauses for all agreements. For agreements with floating interest rate, the
interest rates used correspond to the base dates above.

Cross default

The Company has borrowings and financing agreements including cross default clauses, i.e., the early maturity of any debt, may
imply the early maturity of these agreements. The indicators are continuously monitored in order to avoid the execution of these
clauses.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

5.2 Capital management

The Company’s objectives when managing capital are ensure its ability to continue as a going concern in order to provide returns
for shareholders and benefits for other stakeholders, and to maintain an optimal capital structure to reduce the cost of capital.

The Company monitors capital based on the leverage ratio. This ratio corresponds to net debt divided by total capital. Net debt
corresponds to total borrowings and financing less cash and cash equivalents. Total capital is calculated as total equity as shown
in the statement of the financial position plus net debt.

Total borrowings and financing (Note 16)

(-) Cash and cash equivalents (Note 7)

Net debt

Total equity

Total capital

Leverage ratio

December 31, 2017

December 31, 2016

12,100,966

(2,283,047)

9,817,919

17,513,009

11,964,143

(1,886,221)

10,077,922

15,419,211

27,330,928

25,497,133

36%

40%

As of December 31, 2017, the leverage ratio decreased to 36% from the 40% as of December 31, 2016, mainly due to the increase in
equity generated by the 2017 earnings retention.

5.3 Fair value estimates

It  is  assumed  that  balances  from  trade  receivables  (current)  and  accounts  payable  to  suppliers  by  carrying  amount,  less
impairment approximate their fair values, considering the short maturity.  Long-term trade receivables also approximate their fair
values, as they will be adjusted by inflation and/or will bear contractual interest rates over time.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

5.4 Financial instruments

As of December 31, 2017 and December 31, 2016, the Company did not have financial assets classified as fair value through profit or loss,
held to maturity and available for sale neither financial liabilities classified as fair value through profit or loss. The Company’s financial
instruments included in the borrowings and receivables category comprise cash and cash equivalents, restricted cash, trade receivables,
balances  with  related  parties,  other  receivables,  and  balances  receivable  from  the  Water  National  Agency  –  ANA.  The  financial
instruments  under  the  “other  liabilities”  category  comprise  accounts  payable  to  contractors  and  suppliers,  borrowings  and  financing,
services  payable,  balances  payable  deriving  from  the  Public  Private  Partnership-PPP  and  program  contract  commitments,  which  are
nonderivative financial assets and liabilities with fixed or determinable payments, not quoted in an active market.

The estimated fair values of financial instruments are as follows:

Financial assets

   Cash and cash equivalents

   Restricted cash

   Trade receivables

   Water National Agency – ANA

   Other receivables

December 31, 2017

December 31, 2016

Carrying amount

Fair value

Carrying amount

Fair value

2,283,047

18,822

1,888,505

70,487

169,715

2,283,047

18,822

1,888,505

70,487

169,715

1,886,221

24,078

1,711,306

81,221

167,369

1,886,221

24,078

1,711,306

81,221

167,369

(*)Amount recorded under “other receivables” in current assets.

Additionally,  SABESP  has  financial  instrument  assets  receivables  from  related  parties,  in  the  amount  of  R$815,160  as  of
December  31,  2017  (R$871,709  as  of  December  31,  2016),  which  were  calculated  in  accordance  with  the  conditions  negotiated
between related parties.  The conditions and additional information referring to these financial instruments are disclosed in Note
10 to the financial statements. Part of this balance, in the amount of R$709,208 (R$788,180 as of December 31, 2016), refers to
reimbursement  of  additional  retirement  and  pension  plan  -  G0  and  is  indexed  by  IPCA  plus  simple  interest  of  0.5%  p.m.  This
interest rate approximates that one practiced by federal government bonds (NTN-b) with terms similar to those of related-party
transactions.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Financial liabilities

December 31, 2017

December 31, 2016

Carrying amount

Fair value

Carrying amount

Fair value

   Borrowings and financing

12,100,966

11,967,909

11,964,143

11,776,178

   Accounts payables to suppliers and contractors

   Services payable

   Program contract commitments

344,947

408,275

239,500

344,947

408,275

239,500

311,960

460,054

178,093

311,960

460,054

178,093

   Public-Private Partnership - PPP

3,071,416

3,071,416

2,249,418

2,249,418

To obtain fair value of borrowings and financing, the following criteria have been adopted:

(i)       Agreements with Banco do Brasil and CEF (Brazilian Federal Savings Bank) were projected until their final maturities, at
contractual rates (projected TR + spread) and discounted at present value by TR x DI, both rates were obtained  from B3
(previous denominated BM&FBovespa).

(ii)          Debentures  were  projected  up  to  the  final  maturity  date  according  to  contractual  rates  (IPCA,  DI,  TJLP  or  TR),  and
discounted  to  present  value  considering  the  future  interest  rate  published  by  ANBIMA  in  the  secondary  market,  or  by
market equivalent rates, or the Company’s share traded in the Brazilian market.

(iii)     BNDES loans are financial instruments valued at carrying amount plus contractual interest rate until the maturity date,

and are indexed by long term interest rate – TJLP.

These financing have specific characteristics and the conditions defined in the financing agreements with BNDES between
independent parties, and reflect the conditions for those types of loan. In Brazil, a consolidated market of long-term debts
does not exist with the same characteristics of BNDES financing, the offering of credit to the entities in general, with this
long-term characteristic, usually is restricted to BNDES.

(iv)      Other  financing  in  local  currency  are  considered  by  carrying  amount  plus  contractual  interest  rate  until  maturity  date,

discounted to present value considering a future interest rate published by B3.

(v)     Agreements with BID and IBRD, were projected until final maturity in  origin  currency,  applying interest rates contracted,
discounted at present value at Libor futures rate, obtained from Bloomberg.  Eurobonds was priced at market value through
quotes  published  by  Bloomberg.  All  the  amounts  obtained  were  translated  into  Brazilian  reais  at  the  exchange  rate  of
December 31, 2017.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(vi)      Agreements  with  JICA,  were  projected  until  final  maturity  in  origin  currency,  using  interest  rates  contracted  and
discounted  at  present  value,  at  Tibor  futures  rate  obtained  from  Bloomberg.  The  amounts  obtained  were  translated  into
Brazilian reais at the exchange rate of December 31,  2017.

(vii)  Leases  are  financial  instruments  considered  by  face  value  restated  until  maturity  date,  whose  characteristic  is  the
indexation by fixed contractual rate, which is a specific type, not compared to any other market rate.  Thus, the Company
discloses as market capitalization, the amount recorded as of December 31, 2017.

Financial instruments referring to investments and borrowings and financing are classified as Level 2 in the fair value hierarchy.

Considering  the  nature  of  other  financial  instruments,  assets  and  liabilities  of  the  Company,  the  balances  recognized  in  the
statement of financial position approximate the fair values, taking into account the maturities close to the end of the reporting
period, comparison of contractual interest rates with market rates in similar operations at the end of the reporting periods, their
nature and maturity terms.

6             Key accounting estimates and judgments

Estimates  and  judgments  are  continually  evaluated  and  are  based  on  historical  experience  and  on  other  factors,  including
expectations of future events that are believed to be reasonable under the circumstances.

The Company makes estimates and assumptions concerning the future.  The resulting accounting estimates, by definition, may
differ  from  actual  results.    The  estimates  and  assumptions  that  have  a  significant  risk  of  causing  material  adjustment  to  the
carrying amounts of assets and liabilities within the next financial year are addressed below:

(a)         Allowance for doubtful accounts

The  Company  establishes  an  allowance  for  doubtful  accounts  in  an  amount  that  Management  considers  sufficient  to  cover
expected losses (see Note 9 (c) ), based on an analysis of trade receivables, in accordance with the accounting policy stated in Note
3.4.

The  methodology  for  determining  the  allowance  for  doubtful  accounts  receivable  requires  significant  estimates,  considering  a
number of factors including historical receipt experience, current economic trends, estimates of forecast write-offs, the aging of
the accounts receivable portfolio. While the Company believes that the assumptions used are reasonable, actual results could be
different.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(b)         Intangible assets arising from concession and program contracts

The  Company  recognizes  as  intangible  assets  arising  from  concession  agreements.    The  Company  estimates  the  fair  value  of
construction  and  other  work  on  the  infrastructure  to  recognize  the  cost  of  the  intangible  asset,  which  is  recognized  when  the
infrastructure is built and provided that it will generate future economic benefits.  The great majority of the Company's contracts
for service concession arrangements entered with each grantor is under service concession agreements in which the Company has
the right to receive, at the end of the contract, a payment equivalent to the unamortized asset balance of the concession intangible
asset, which in this case, are amortized over the useful life of the underlying physical assets, thus at the end of the contract, the
remaining value of the intangible would be equal to the residual value of the related fixed asset.

Concession  intangible  assets  under  Concession  agreements  and  Program  contracts,  in  which,  at  the  end  of  the  contract,  the
Company  has  no  right  to  receive  a  payment  equivalent  to  the  unamortized  asset  balance  of  the  concession  intangible,  are
amortized on a straight-line basis over the useful life of asset or contract period, which occurs first.  Additional information on the
accounting for intangible assets arising from concession agreements are described in Notes 3.8 and 14.

The recognition of fair value for the intangible assets arising on concession agreements is subject to assumptions and estimates,
and the use of different assumptions could affect the balances recorded. Different assumptions and estimates and changes in the
useful lives of the intangible assets may have relevant impacts on the results of operations.

(c)          Pension benefits

The Company sponsors the defined benefit plan and the defined contribution plan, as described in Note 20.

The  liability  recognized  in  the  balance  sheet  in  relation  to  defined  benefit  pension  plans  is  the  present  value  of  defined  benefit
obligation on the balance sheet date, less the fair value of plan assets. The benefit obligation is calculated yearly by independent
actuaries, applying the projected credit unit method.  The present value of defined benefit obligation is determined by discounting
the estimated future cash outflows, using interest rates compatible with the market, which are denominated in currency in which
benefits  will  be  paid  and  with  maturity  terms  close  to  those  of  corresponding  pension  plan  obligation.  Additional  information
related to pension benefits are described in Note 20.

(d)         Deferred income tax and social contribution

The  Company  recognizes  and  settles  taxes  on  income  based  on  the  results  of  operations  verified  according  to  the  Brazilian
Corporation Law, taking into consideration the provisions of the tax laws. Pursuant to IAS 12, the Company recognizes deferred
tax assets and liabilities based on the differences between the accounting balances and the tax bases of assets and liabilities.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

The Company regularly reviews the recoverability of deferred tax assets and recognizes a provision for impairment if it is probable
that  these  assets  will  not  be  realized,  based  on  the  historic  taxable  income,  in  the  projection  of  future  taxable  income  and  the
estimated period of reversing temporary differences. These calculations require the use of estimates and assumptions. The use of
different estimates and assumptions could result in provision for impairment of all or a significant amount of deferred tax assets.
Additional information related to taxes are described in Note 18.

(e)          Provisions

The Company is party to a number of legal proceedings involving significant claims. These legal proceedings include, but are not
limited  to,  tax,  labor,  civil,  environmental,  disputes  with  customers  and  suppliers.  The  Company  recorgnizes  a  provision  for
lawsuits  when  it  has  a  present  obligation  (legal  or  constructive)  arising  from  a  past  event,  it  is  probable  that  an  outflow  of
resources embodying economic benefits will be necessary to settle the liability and the amount of such obligation can be reliable
estimated.    Judgments  regarding  future  events  may  differ  significantly  from  actual  estimates  and  could  exceed  the  amounts
provisioned.    Provisions  are  revised  and  adjusted  to  take  into  consideration  changes  in  circumstances  involved.  Additional
information of these legal proceedings are disclosed in Note 19.

7             Cash and cash equivalents

Cash and banks

Cash equivalents

December 31, 2017

December 31, 2016

171,951

2,111,096

2,283,047

137,395

1,748,826

1,886,221

Cash and cash equivalents include cash, bank deposits and high-liquidity short-term financial investments, mainly represented by
repurchase agreements (accruing CDI interest rates), deposited at Banco do Brasil, whose original maturities are lower than three
months, which are convertible into a cash amount and subject to an insignificant risk of change in value.

The average yield of financial investments corresponds to 98.88% of CDI in December 2017 (99.24% in December 2016).

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

8             Restricted cash

Current

Agreement with the São Paulo municipal government (i)

Brazilian Federal Savings Bank – escrow deposits (ii)

Other

December 31, 2017

December 31, 2016

12,055

1,209

5,558

18,822

15,858

2,989

5,231

24,078

(i)    Refers to the amount deducted from the 7.5% of Municipal revenue transferred to the Municipal Fund, corresponding to
eventual  amounts  unpaid  by  direct  management  bodies,  foundations  and  government  agencies,  as  established  in  the
agreement entered into with the municipal government of São Paulo; and

(ii)   Refers to savings account for receiving escrow deposits regarding lawsuits with final and unappealable decisions in favor

of the Company, which are blocked as per contractual clause.

9             Trade receivables

(a)      Financial position balances

Private sector:

General and special customers (i) (ii)

Agreements (iii)

Government entities:

Municipal

Federal

Agreements (iii)

Wholesale customers – Municipal governments: (iv)

Guarulhos

Mauá

Mogi das Cruzes

Santo André

São Caetano do Sul

Diadema

Total wholesale customers – Municipal governments

Unbilled supply

Subtotal

Allowance for doubtful accounts

Total

December 31, 2017

December 31, 2016

1,248,979
320,032

1,569,011

532,320

3,547
285,614

821,481

760,598

530,830

2,670

1,048,832

2,604
222,671

2,568,205

580,006

5,538,703
(3,650,198)

1,888,505

1,205,498
315,351

1,520,849

520,950

3,414
279,449

803,813

778,106

467,775

2,527

946,045

2,371
222,671

2,419,495

481,389

5,225,546
(3,514,240)

1,711,306

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Current
Noncurrent

1,672,595

215,910

1,888,505

1,557,472

153,834

1,711,306

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i)    General customers - residential and small and mid-sized companies

(ii)    Special  customers  -  large  consumers,  commercial,  industries,  condominiums  and  special  billing  consumers  (fixed

demand agreements, industrial waste, wells, etc.).

(iii) Agreements - installment payments of past-due receivables, plus monetary adjustment and interest, according to the

agreements.

(iv) Wholesale basis customers - municipal governments - This balance refers to the sale of treated water to municipalities,
which  are  responsible  for  distributing  to,  billing  and  charging  final  customers.  Some  of  these  municipalities  are
questioning in court the tariffs charged by SABESP, which have full allowance for doubtful accounts. Additionally, the
overdue amounts are included in the allowance for doubtful accounts.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(b)      The aging of trade receivables is as follows

December 31, 2017

December 31, 2016

Current

Past-due:

Up to 30 days

From 31 to 60 days

From 61 to 90 days

From 91 to 120 days

From 121 to 180 days

From 181 to 360 days

Over 360 days

Total past-due

Total

1,471,668

287,173

118,179

73,989

52,477

105,952

147,699
3,281,566

4,067,035

5,538,703

1,337,503

263,157

148,927

53,268

109,138

124,001

203,837
2,985,715

3,888,043

5,225,546

The increase in the overdue balance was mainly due to the default of the municipalities that purchased water on a wholesale basis,
given that they are challenging the tariffs charged by SABESP in court.

(c)      Allowance for doubtful accounts    

Balance at beginning of the year

Private sector /government entities

Recoveries

Wholesale customers

Net additions for the year

Write-offs of accounts receivable during the year

December 31, 2017

December 31, 2016

December 31, 2015

3,514,240

75,973

(133,730)
193,715

135,958

-

3,307,793

144,217

(241,109)
331,295

234,403

(27,956)

3,164,288

103,231

(177,993)
283,113

208,351

(64,846)

Balance at end of the year

3,650,198

3,514,240

3,307,793

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Reconciliation of estimated losses
 of income

Write-offs

(Losses)/reversal with state entities - related parties

Losses with private sector / government entities

(Losses)/reversal with wholesale customers

Recoveries

December 31, 2017

December 31, 2016

December 31, 2015

(171,729)

21,510

(75,973)

9,781
133,730

(177,492)

(7,292)

(144,217)

(2,596)
241,109

(63,076)

(3,999)

(103,231)

(10,107)
177,993

Amount recorded as selling expenses

(82,681)

(90,488)

(2,420)

Wholesale sales losses, amounting to R$ 203,496 were reported as a reduction of revenue and sales expenses in 2017. In 2016 and
2015, R$328,699 and R$273,006, respectively, were fully reported as a reduction of revenue.

The Company does not have customers representing 10% or more of its total revenues.

10           Related-Party Balances and Transactions

The Company is a party to transactions with its controlling shareholder, the State Government, and companies related to it.

(a)            Accounts  receivable,  interest  on  capital  payable,  revenue  and  expenses  with  the  São  Paulo  State
Government

December 31, 2017

December 31, 2016

Accounts receivable

Current:

   Sanitation services (i)

   Allowance for losses (i)

   Reimbursement for retirement and pension benefits paid (G0):

      - monthly flow (payments) (ii) and (vi)

      - GESP Agreement – 2008 (ii) and (vi)

      - GESP Agreement – 2015 (vii)

   “Se Liga na Rede” program (l)

Total current

Noncurrent:

    Agreement for the installment payment of sanitation services

   Reimbursement for retirement and pension benefits paid (G0):

      - GESP Agreement – 2008 (ii) and (vi)

      - GESP Agreement – 2015 (vii)

Total noncurrent

Total receivables from shareholders

Assets:

Sanitation services

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118,441

(35,114)

22,968

20,099

54,379
-

180,773

22,625

-

611,762

634,387

815.160

105,952

134,005

(56,624)

22,696

56,512

39,816
6,148

202,553

-

18,838

650,318

669,156

871,709

77,381

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Reimbursement of additional retirement and pension benefits (G0)
“Se Liga na Rede” program (l)

Total

Liabilities:

Interest on capital payable to related parties

Other (g)

709,208

-

815,160

300,717

1,367

788,180

6,148

871,709

351,788

1,853

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Revenue from sanitation services

Payments received from related parties

2017

2016

2015

462,989

445,726

357,512

(471,081)

(424,549)

(338,471)

Receipt of GESP reimbursement referring to Law 4,819/58

(192,889)

(139,472)

(121,709)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i)      Sanitation services

The Company provides water supply and sewage services to the São Paulo State Government and other companies related to it in
accordance with usual market terms and conditions, as considered by management, except for the settlement of credits which can
be made according to items (iii), (iv) and (v), below.

The  Company  recognized  R$35,114  as  of  December  31,  2017  (R$56,624  as  of  December  31,  2016)  as  allowance  for  losses  of
amounts past due for more than 360 days has been recorded due to the uncertainty involving these receipts.

(ii)    Reimbursement of additional retirement and pension benefits paid

Refers to amounts of supplementary retirement and pension benefits provided for in State Law 4,819/58 ("Benefits") paid by the
Company to former employees and pensioners, referred to as Go.

Under  the  Agreement  referred  on  item  (iii)  with  the  São  Paulo  State  Government  ("GESP"  or  the  "State"),  GESP  recognizes  its
liability from charges arising from the Benefits, provided that the payment criteria set forth by the State Department of Personnel
(DDPE), based on legal guidance of the Legal Consultancy of the Department of Finance and of the State Attorney General's Office
(PGE).

As discussed on item (vi), during the assessment of the debt due from GESP to the Company there were certain divergences in the
calculation and eligibility criteria of the benefits paid by the Company on behalf of GESP.

See additional information about the Go plan in Note 20 (b) (iii).

In  January  2004,  the  payments  of  supplement  retirement  and  pension  benefits  were  transferred  to  the  Department  of  Finance
and  would  be  made  in  accordance  with  the  calculation  criteria  determined  by  the  PGE.    As  a  result  of  a  court  decision,  the
responsibility for making the payments returned to SABESP, as originally established.

(iii)     GESP Agreement

On  December  11,  2001,  the  Company,  the  São  Paulo  State  Government  (through  the  State  Department  of  Finance  Affairs,
currently  Department  of  Finance)  and  the  Water  and  Electricity  Department  (DAEE),  with  the  intermediation  of  the  State
Department of Sanitation and Energy (former Department of Water Resources, Sanitation and Construction Works), entered into
the  Obligations,  Payment  Commitment  and  Other  Covenants  Acknowledgement  and  Consolidation  Agreement  ("GESP
Agreement")  for  the  settlement  of  outstanding  debts  between  GESP  and  the  Company  related  to  sanitation  services  and  to  the
retirement benefits.

In view of the strategic importance of the Taiaçupeba, Jundiaí, Biritiba, Paraitinga and Ponte Nova reservoirs for ensuring and
maintaining the Alto Tietê water volume, the Company agreed to receive them as partial repayment of the reimbursement related
to the Benefits.  The DAEE would transfer the reservoirs to the Company, replacing the amount owed by GESP.  However, the São
Paulo State Public Prosecution Office challenges the legal validity of this agreement, and its main argument is the lack of bidding
and the absence of a specific legislative authorization for disposal of DAEE's assets.  There is an unfavorable decision to SABESP
not yet unappealable.  See additional information in item (viii) below.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(iv)      First Amendment to the GESP Agreement

On March 22, 2004, the Company and the São Paulo State Government amended the terms of the original GESP Agreement, (1)
consolidating  and  recognizing  the  amounts  due  by  the  São  Paulo  State  Government  for  water  supply  and  sewage  services
provided, monetarily adjusted through February 2004; (2) formally authorizing the offset of amounts due by the São Paulo State
Government with interest on capital declared by the Company and any other debt owed to the São Paulo State Government as of
December  31,  2003,  monetarily  adjusted  through  February  2004;  and  (3)  defining  the  payment  conditions  of  the  remaining
liabilities of the São Paulo State Government for the receipt of the water supply and sewage services.

(v)           Second Amendment to the GESP Agreement

On December 28,  2007, the Company  and the  São  Paulo  State Government, represented by the Department of Finance, signed
the second amendment to the terms of the original GESP Agreement, agreeing upon the payment in installments of the remaining
balance  of  the  First  Amendment,  amounting  to  R$133,709  at  November  30,  2007,  to  be  paid  in  60  monthly  and  consecutive
installments of the same amount, beginning on January 2, 2008.  In December 2012 the last installment was paid.

(vi)      Third Amendment to the GESP Agreement

On November 17, 2008, GESP, SABESP and DAEE signed the third amendment to the GESP Agreement, through which GESP
recognized a debt balance payable to SABESP totaling R$915,251, monetarily adjusted up to September 2008 in accordance with
the fluctuation of the IPCA-IBGE, corresponding to the Undisputed Reimbursement, determined by FIPECAFI. SABESP accepted
on  a  provisional  basis  the  reservoirs  (see  information  on  item  (iii)  of  this  note)  as  part  of  the  payment  of  the  Undisputed
Reimbursement  and  offered  to  GESP  a  provisional  settlement,  recognizing  a  credit  totaling  R$696,283,  corresponding  to  the
value  of  the  reservoirs  in  the  Alto  Tietê  system.  The  Company  did  not  recognize  the  reimbursement  receivable  of  R$696,283
related  to  the  reservoirs,  as  it  is  not  virtually  certain  that  will  be  transferred  by  the  State.  In  March  2015,  Sabesp  and  GESP
entered into an agreement to pay the amounts receivable, totaling R$696,283 (more information in item (vii) of this note). The
remaining balance totaling R$218,967 has been paid in 114 monthly, consecutive installments, totaling R$1,920 each, including
the annual IPCA-IBGE fluctuation, plus interest of 0.5% p.m.. The amounts are paid on a monthly basis and the last installment
matures in April 2018.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

In addition, the third amendment provides for the regularization of the monthly flow of benefits.  While SABESP is liable for the
monthly payment of benefits, the State shall reimburse SABESP based on the criteria identical to those applied when determining
the Undisputed Reimbursement.  Should there be no preventive court decision, the State will assume the flow of monthly payment
of benefits portion deemed as undisputed.

(vii)    Agreement with the São Paulo State Government entered into in 2015

On March 18, 2015, the Company, the State of São Paulo and the Department of Water and Electricity (DAEE), and the Sanitation
and Water Resources Department as the intervening party, entered into a Term of Agreement in the amount of R$1,012,310, of
which R$696,283 refer to the principal of the Undisputed Amount mentioned in item (vi) and R$316,027 corresponding to the
inflation adjustment of the principal until February 2015.

The Principal Amount will be paid in 180 installments, as follows:

·        The  first  24  installments  were  settled  by  immediately  transferring  2,221,000  preferred  shares  issued  by  Companhia  de
Transmissão de Energia Elétrica Paulista - CTEEP, totaling R$87,174, based on the share closing on March 17, 2015; and

·         The amount of R$609,109, payable in 156 monthly installments, was adjusted by IPCA (Extended Consumer Price Index)
until the initial payment date, on April 5, 2017. As of this date, installments are being adjusted by IPCA plus simple interest
of 0.5% per month.

Considering  the  lawsuit  which  objects  the  possibility  of  transferring  the  reservoirs  is  pending  final  and  unappealable  court
decision, the agreement also provides for the following situations:

·                  If  transfer  is  possible  and  the  Reservoirs  are  effectively  transferred  to  SABESP  and  registered  at  the  notary’s  office,
SABESP  will  reimburse  to  the  State  the  amounts  paid  in  replacement  of  Reservoirs  (Principal  Amount)  in  60  monthly
installments adjusted by IPCA until the date of payment of each installment; and

·    If the transfer of Reservoirs is not possible, the State will pay to SABESP, in addition to the Principal Amount, the inflation
adjustment  credit  of  R$316,027  in  60  installments,  starting  these  payments  at  the  end  of  Principal  Amount  installment
payment. The amount will be adjusted by IPCA to the start date of payments and, as of this date, IPCA will be incurred plus
0.5% simple interest rates/month over the amount of each installment.

The accounting impacts of the agreement generated a debit of R$696,283 in accounts receivable from related parties and a credit
in the same amount in administrative expenses on the transaction date. As of December 31, 2017, the balance receivable totaled
R$54,379 in current assets (R$ 39,816 as of December 31, 2016) and R$611,762  in noncurrent assets (R$ 650,318 as of December
31, 2016) and CTEEP shares were disposed of on April 20, 2016 for R$111.1 million.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(viii)   Disputed Amount of Benefits

As mentioned before, on November 17, 2008 the Company and the State signed the third amendment to the GESP Agreement,
when the reimbursements called disputed and undisputed were quantified.  The amendment established the efforts to calculate
the so-called Disputed Reimbursement of the Benefits. Under the fourth clause of the amendment, the Disputed Reimbursement
represents  the  difference  between  the  Undisputable  Reimbursement  and  the  amount  actually  paid  by  the  Company  as  pension
benefits and pensioners set out in Law 4,819/58, for which, the Company understands, the State of São Paulo is originally liable,
but paid by SABESP under a court order.

By entering into the third amendment, the State's Legal Representative (PGE) agreed to reassess the differences that gave rise to
the Disputed Amount of benefits set out in Law 4,819/58. At the time, the expectation was based on the willingness of the PGE to
reanalyze the issue and the implied right of the Company to the reimbursement, including based on opinions from outside legal
advisors.

However,  the  recent  opinions  issued  by  the  PGE  and  received  on  September  4  and  22,  2009  and  January  4,  2010,  refute  the
reimbursement of previously defined as Disputed Amount.

Even  though  the  negotiations  with  the  State  are  still  in  progress,  it  is  not  possible  to  assure  that  the  Company  will  recover  the
disputed  receivables without dispute.

As part of the actions intended to recover the receivables that management considers due by the State, related to discrepancies in
the  reimbursement  of  the  pension  benefits  paid  by  the  Company,  SABESP:    (i)  on  March  24,  2010,  reported  to  the  controlling
shareholder the official letter approved by the executive committee, proposing that the matter be discussed at the São Paulo Stock
Exchange (B3) Arbitration Chamber; (ii) in June 2010, presented to Department of Finance a proposal to solve the outstanding
items, such proposal was not accepted; (iii) on November 9, 2010, filed a judicial action against the State of São Paulo pleading
the entire reimbursement related to employee benefits set out in Law 4,819/58 to finalize the discussion between the Company
and GESP. Despite the legal action, the expectation of which is a possible gain, the Company will persist to obtain an agreement
with GESP since the management believes that it is the best course of action to the Company and to its shareholders than waiting
until the end of the lawsuit.

The  Company's  Management  decided  to  record  allowance  for  losses  of  amounts  receivables  from  the  State;  as  of  December  31,
2017 and 2016, the amounts related to the pension plan benefits paid and recorded for allowance for doubtful accounts totaled
R$ 1,021,657 and R$ 937,035, respectively.

As  a  result,  the  Company  also  recognized  the  obligation  related  to  the  pension  benefit  obligations  maintained  with  the
beneficiaries, retirees and pensioners of Plan G0.  As of December 31, 2017 and 2016, the pension benefit obligations of Plan G0
totaled R$2,543,877 and R$2,512,080, respectively. For detailed information on the pension benefit obligations refer to Note 20
(b) (iii).

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(b)      Use of reservoirs – EMAE  

Empresa Metropolitana de Águas e Energia S.A. - EMAE planned to receive for the credit and obtain financial compensation for
alleged past and future losses in electricity generation, due to water collection, and compensation for costs already incurred and to
be incurred with the operation, maintenance and inspection of the Guarapiranga and Billings reservoirs used by SABESP in its
operations.

Several  lawsuits  were  filed  by  EMAE.  An  arbitration  proceeding  was  in  progress  related  to  the  Guarapiranga  reservoir  and  a
lawsuit related to the Billings reservoir, both pleading for financial compensation due to SABESP’s water collect for public supply,
alleging that this conduct has been causing permanent and growing loss in the capacity of generating electricity of Henry Borden
hydroelectric power plant with financial losses.

As of April 10, 2014, the Company issued a Notice to the Market including the information about an eventual future agreement.

As  of  October  28,  2016,  the  Company  entered  into  an  agreement  based  on  a  Private  Transaction  Agreement  and  Other
Adjustments  aimed  to  fully  and  completely  settle  the  disputes  involving  the  two  companies.    The  transaction  is  subject  to  the
condition  precedent  of  approval  by  the  competent  bodies  of  the  Company  and  EMAE,  as  well  as  the  Brazilian  Electricity
Regulatory Agency – ANEEL, and involves the payment by SABESP to EMAE of the following amounts:

- R$ 6,610 annually, adjusted for inflation, as of the execution date of this instrument, by the IPCA or any other index that may
replace it, by the last business day of October of each fiscal year, with (i) the first of  such annual payments due up to the last
business day of October 2017 and (ii) the last payment due up to the last business day of October 2042; and

- R$46,270, in five annual and successive installments, adjusted for inflation by the IPCA or any other index that may replace
it,  with  the  first  installment  of  R$9,254  due  on  April  30,  2017  and  the  subsequent  ones  in    4  (four)  installments  of  same
amount, due on every April 30 of the subsequent years, or on the first subsequent business day.

The  agreement  was  based  on  the  following  assumptions:  (i)  SABESP  payments  should  not  exceed  the  amount  necessary  to
indemnify EMAE for the maintenance and operating costs of the Guarapiranga and Billings reservoirs, based on the percentage of
the  collection  considering  the  natural  outflow  of  each  reservoir;  (ii)  payments  will  be  made  while  SABESP’s  and  EMAE’s
concessions are valid, and as long as SABESP withdraws water from these reservoirs, in compliance with the statute of limitations
of the objects of the proceedings; (iii) SABESP must request ARSESP to incorporate these expenses into the tariff revision process
in progress.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

In  order  to  estimate  the  maintenance  and  preservation  expenses  of  the  hydraulic  and  property  structures  of  the  Billings  and
Guarapiranga reservoirs, the technical area involved in water production adopted the following assumptions:  (i) expenses related
to the Guarapiranga Reservoir, whose water is used exclusively to supply the population of the São Paulo Metropolitan Region,
will  be  fully  paid  by  SABESP;  (ii)  the  Billings  reservoir  has  multiple  uses  –  flood  control,  generation  of  electricity  and  public
supply  –  and  its  maintenance  and  operating  expenses  should  be  shared  based  on  the  proportion  of  water  used  by  each  of  the
functions mentioned; (iii) SABESP has grants to use water in several points of the Billings reservoir that total an available outflow
of 10.0 m³/s, representing 61.7% of the reservoir’s long-term average outflow (16.2 m³/s); and (iv) considering the water volume
usage percentages - 100% Guarapiranga and 61.70% Billings – an annual amount of R$6,610 will be charged as shared expenses,
based on the terms of the agreement.

The Company determined the annual amount of R$6,610 from 2010 to 2042, including the statute of limitations and the year of
expiration of the EMAE concession.

For these reasons, the Company has concluded that it was in its interest to enter into the agreement since: (i) it eliminates the
incidence of future risks with the dismissal of all proceedings; (ii) its amount is limited to a reasonable amount to be paid for the
sharing  of  the  operating  and  maintenance  costs  of  the  Guarapiranga  and  Billings  reservoirs;  and  (iii)  the  form  of  payment  is
appropriate to its financial situation.

By entering into the Agreement, all litigation between the parties will cease permanently and the Company will continue using the
reservoirs.

In  addition  to  the  lawsuits  that  were  part  of  the  Agreement,  on  April  11,  2016,  SABESP  was  named  in  the  Indemnification
proceeding commenced by EMAE’s minority shareholders, who claimed compensation for damages suffered by EMAE, based on
the amounts that the latter did not earn due to the decrease in the outflow of these reservoirs and in the generation of electricity as
a result of the use of water of the Billings and Guarapiranga reservoirs by SABESP, and also requested that SABESP be sentenced
to reimburse the loss of profits related to EMAE’s unearned amounts resulting from the fact that water was not pumped from the
Pinheiros and Tietê Rivers to the Henry Borden hydroelectric power plant.  In summary, the company claims  that the São Paulo
State,  in  its  capacity  as  controlling  shareholder  of  EMAE,  has  acted  unduly  to  EMAE’s  detriment  and  in  favor  of  SABESP’s
interests  by  allowing  and  consenting  water  intake  from  the  Billings  and  Guarapiranga  reservoirs,  in  detriment  to  the  output  of
these reservoirs and generation of electricity by EMAE, without the necessary financial compensation, making impracticable the
satisfactory use of the Henry Borden hydroelectric power plant. 

As  of  December  31,  2016,  the  Company  recorded  R$9,018  and  R$29,749  in  Other  Liabilities,  under  current    and  noncurrent
liabilities, respectively, which represent the present value of the balance of R$46,270 that will be paid in five annual installments.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

As of November 9, 2016, EMAE’s Board of Directors approved the transaction with SABESP, pursuant to the Private Transaction
Agreement, in accordance with the Notice to the Market disclosed by EMAE on the same date.

As of November 10, 2016, the transaction was approved by SABESP’s Board of Directors.

As of December 30, 2016, the Brazilian Electricity Regulatory Agency - ANEEL, by means of Order 3,431, decided to approve the
Private  Transaction  Agreement  and  other  Covenants  entered  into  between  Empresa  Metropolitana  de  Águas  e  Energia  S.A.  -
EMAE, and the Company, thus meeting the “second condition precedent” required for the effectiveness of the agreement.

As  of  October  19,  2017,  SABESP  and  EMAE  executed  the  first  amendment  to  the  Private  Transaction  Agreement  and  Other
Covenants  for  removal  of  the  condition  precedent  related  to  the  approval  of  said  agreement  at  EMAE’s  Extraordinary
Shareholders’  Meeting,  which  was  approved  by  the  Boards  of  Directors  of  SABESP  and  EMAE.  The  conditions  precedent  were
complied with and the agreement came into effect.

In 2017, the Company recorded R$6,110 and R$64,180 in other liabilities, under current and noncurrent liabilities, respectively,
which  represent  the  present  value  of  the  balance  of  R$171,860  that  will  be  paid  in  annual  installments  with  expected  maturity
from October 2017 until October 2042.

In October 2017, the Company paid the installments maturing in April 2017 and October 2017, of R$ 9,316 and 
R$ 6,760 respectively. As of December 31, 2017, the balance of the agreement totaled R$ 15,668 and R$ 92,894, recorded under
other liabilities, in current and noncurrent liabilities, respectively.

(c)      Agreements with reduced tariffs with State and Municipal Government Entities that joined the Rational
Water Use Program (PURA)

The  Company  has  signed  agreements  with  government  entities  related  to  the  State  Government  and  municipalities  where  it
operates that benefit from a reduction of 25% in the tariff of water supply and sewage services when they are not in default. These
agreements  provide  for  the  implementation  of  the  rational  water  use  program,  which  takes  into  consideration  the  reduction  in
water consumption.

(d)      Guarantees

The State Government provides guarantees for some borrowings and financing of the Company and does not charge any fee with
respect to such guarantees.

(e)     Personnel assignment agreement among entities related to the State Government

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

The  Company  has  personnel  assignment  agreements  with  entities  related  to  the  State  Government,  whose  expenses  are  fully
passed on and monetarily reimbursed.  In 2017, the expenses related to personnel assigned by SABESP to other state government
entities amounted to R$9,853 (R$10,393 in 2016 and R$10,481 in 2015).

In 2017, there were no expenses related to personnel assigned by other entities to SABESP (R$10 in 2016 and R$342 in 2015).

(f) Services obtained from state government entities

As  of  December  31,  2017  and  2016,  SABESP  had  an  outstanding  amounts  payable  of  R$1,367  and  R$1,853,  respectively,  for
services rendered by São Paulo State Government entities.

(g)      Non-operating assets

As  of  December  31,  2017  and  December  31,  2016,  the  Company  had  an  amount  of  R$969  related  to  a  free  land  lent  to  DAEE
(Department of Water and Electricity).

(h)            Sabesprev   

The  Company  sponsors  a  private  defined  benefit  pension  plan,  which  is  operated  and  administered  by  Sabesprev.  The  net
actuarial liability recognized as of December 31, 2017 amounted to R$388,461 (R$753,170 as of December 31, 2016), according to
Note 20 (b) (i).

(i)       Compensation of Management Key Personnel

- Compensation:

SABESP's  compensation  policy  for  the  Management  and  officers  is  set  out  according  to  guidelines  of  the  São  Paulo  State
Government, issued by the CODEC (State Capital protection Board), and are based on performance, market competitiveness, or
other  indicators  related  to  the  Company's  business,  and  is  subject  to  approval  by  shareholders  at  an  Annual  Shareholders'
Meeting.

The  Executive  Officers’  fees  are  also  defined  by  government  authorities.  Management  and  Fiscal  Council’s  compensation  is
equivalent  to  30  percent  and  20  percent,  respectively,  of  the  Executive  Officers’  fee,  contingent  on  attendance  of  at  least  one
monthly meeting.

The objective of the compensation policy is to set a private sector management paradigm to retain its staff and recruit competent,
experienced and motivated professionals, considering the level of management efficiency currently required by the Company.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

In  addition  to  monthly  fee,  the  members  of  the  Board  of  Directors,  Fiscal  Council  and  the  Board  of  Executive  Officers  receive
annual reward equivalent to a monthly fee, calculated on a prorated basis in December of each year.  The purpose of this reward is
to correspond to the thirteenth salary paid to the Company’s employees, as officers and directors' relationship with the Company
is governed by its bylaws and not the labor code.

Benefits paid only to statutory officers - meal ticket, basket of food staples, medical care, annual paid rest typified as a paid leave
of 30 calendar days, and payment of a premium equivalent to one third of the monthly fee and bonuses.

SABESP  pays  bonuses  for  the  purposes  of  compensating  directors,  in  accordance  with  the  guidelines  of  the  São  Paulo  State
government,  as  an  incentive  policy,  as  long  as  the  Company  records  quarterly,  semiannual,  and  yearly  profits,  and  distributes
mandatory  dividends  to  shareholders,  even  if  in  the  form  of  interest  on  capital.    Annual  bonuses  cannot  exceed  six  times  the
monthly  compensation  of  the  officers/directors  or  10  percent  of  the  interest  on  capital  paid  by  the  Company,  prevailing  the
shortest amount.

Expenses related to the compensation to the members of its Board of Directors, Fiscal Council and Board of Executive Officers
amounted to R$3,813, R$3,912 and R$4,078 for 2017, 2016 and 2015, respectively.  An additional amount of R$556, related to
the bonus program, was recorded in 2017 (R$494 in 2016 and R$521 in 2015).

(j) Loan agreement through credit facility

The Company holds interest in certain Special Purpose Entities (SPEs), not holding the majority interest but with cast vote and
power of veto in some issues, with no ability to use such power of veto in a way to affect returns over
investments. Therefore, these SPEs are considered for accounting purposes as jointly-owned subsidiaries.

The Company entered into a loan agreement through credit facility with the SPEs Aquapolo Ambiental S.A. as of March 30, 2012,
and  with  Attend  Ambiental  S.A.  as  of  May  9,  2014,  to  finance  the  operations  of  these  companies,  until  the  borrowings  and
financing requested with financial institutions is granted.

These agreements remain with the same characteristics, according to the table below:

SPE

Principal disbursed
amount

Interest balance

Total

Interest rate

Maturity

Attend Ambiental

Aquapolo Ambiental

Aquapolo Ambiental

Total

5,400

5,629

19,000

30,029

9,277

SELIC + 3.5 % a.a.

CDI + 1.2% a.a.

CDI + 1.2% a.a.

10,838

30,502

50,617

(i)

(ii)

(iii)

3,877

5,209

11,502

20,588

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i)   The loan agreement with SPE Attend  Ambiental  S/A  matures  within  180  days,  from  the  date when  the respective
amount is available in the borrower’s account, renewable for the same period.  The credit has been overdue since May 11,
2015  and  is  subject  to  contractual  default  charges  (inflation  adjustment  considering  the  IGP-M  variation,  2%  fine  and
default interest of 1% p.m.).  The agreement has been renegotiated between the parties.

(ii)          The  R$5,629  loan  agreement  originally  expired  on  April  30,  2016.    As  of  February  10,  2016,  an  amendment  to  the
agreement  changed  the  payment  schedule  for  four  annual  installments,  the  first  of  which  maturing  on  December  30,
2018 and the last on December 30, 2021; and

(iii)   The loan agreement totaling R$19,000 originally expired on April 30, 2015, was extended to October 30, 2015 and on
November 25, 2015 a new amendment changed the payment schedule for three annual installments, the first of which
maturing on December 30, 2021 and the last on December 30, 2023.

The amount disbursed is recognized under “Other Receivables”, of which R$ 1,780 was classified in Current Assets and R$ 48,837
in  Noncurrent  Assets.  As  of  December  31,  2017,  the  balance  of  principal  and  interest  rates  of  these  agreements  was  R$  50,617
(R$52,407 as of December 31, 2016).  In 2017, the financial income recognized was R$5,017 (R$7,118 in 2016 and R$10,123 in
2015).

(l)       “Se Liga na Rede” (Connect to the Network Program)

The  State  Government  enacted  the  State  Law  no.  14,687/12,  creating  the  pro-connection  program,  destined  to  financially
subsidize the execution of household branches necessary to connect to the sewage collecting networks, in low income households
which agreed to adhere to the program.  The program expenditures, except for indirect costs, construction margin and borrowing
costs are financed with 80% of funds deriving from the State Government and the remaining 20% invested by SABESP, which is
also  liable  for  the  execution  of  works.    As  of  December  31,  2017,  the  program  total  amount  was  R$82,697  (R$79,274  as  of
December  31,  2016),  there  was  no  balance  receivable  from  related  parties  (R$6,148  as  of  December  31,  2016),  the  amount  of
R$35,068 (R$34,915 as of December 31, 2016) recorded in the group of intangible assets and R$47,629 was reimbursed by GESP
(R$38,211 as of December 31, 2016) from the beginning of the program until December 31, 2017.

11            Water National Agency - ANA

The Company has agreements executed within the scope of the Hydrographic Basin Depollution Program (PRODES), also known
as "Treated Sewage Purchase Program".

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

This  program  does  not  finance  works  or  equipment,  remunerates  by  results  achieved,  i.e.,  by  effectively  treated  sewage.  In  this
program, the Water National Agency (ANA) makes available funds, which are restricted to a specific current account and applied
in  investment  funds  at  the  Caixa  Econômica  Federal  –  Brazilian  Federal  Savings  Banks  (CEF),  until  the  fulfillment  of  treated
sewage volume is evidenced, as well as, the reduction of polluting cargoes of each agreement.

When  resources  are  made  available,  liabilities  are  recorded  until  funds  are  released  by  ANA.  After  the  evidence  of  targets
stipulated in each contract, the revenue deriving from these funds is recognized, but if these targets are not met, funds will return
to the National Treasury with the appropriate funds earnings. As of December 31, 2017, the balances of assets and liabilities were
R$70,487 (R$81,221 as of December 31, 2016), and the liabilities are recorded under "other liabilities" of noncurrent liabilities.

12           Investments

The Company holds interest in certain Special Purpose Entities (SPE). Although SABESP has no majority shares of its investees,
the shareholders’ agreement provides for the power of veto in certain management issues, however, with no ability to use such
power of veto in a way to affect returns over investments, indicating participating shared control (joint venture – IFRS 11).

The Company holds interest valued by the equity accounting in the following investees:

Sesamm

As  of  August  15,  2008,  the  Company,  together  with  GS  Inima  Brasil  Ltda  (“GS  Inima”),  successor  of  Técnicas  y  Gestion
Medioambiental  S.A.U.  (“TGM”)  and  GS  Inima  Environment  S/A  (currently  OHL  Medio  Ambiente);  and  Estudos  Técnicos  e
Projetos  ETEP  Ltda.  (“ETEP”),  succeeded  by  ECS  Operações  e  Participações  Ltda  (“ECS”),  incorporated  Sesamm  –  Serviços  de
Saneamento de Mogi Mirim S/A for a period of 30 years from the date the concession agreement with the municipality for the
purpose of providing complementary services to the sewage diversion system and implementing and operating sewage treatment
system in the municipality of Mogi Mirim, including the disposal of solid waste.

Sesamm's  capital  as  of  December  31,  2017,  totaled  R$  19,532,  and  was  represented  by  19,532,409  registered  common  shares
without a par value. SABESP holds a 36% interest, GS Inima 57% and ECS 7%.

The operations initiated in June 2012.

Águas de Andradina

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

As  of  September  15,  2010,  the  Company,  together  with  Companhia  de  Águas  do  Brasil  –  Cab  Ambiental,  currently  Iguá
Saneamento S/A (“Iguá”), incorporated Águas de Andradina S.A., with indefinite term, for the purpose of providing water supply
and sewage services to the municipality of Andradina.

As of December 31, 2017, the capital of Águas de Andradina totaled R$ 13,841, divided into 13,840,885 registered common shares
without a par value. SABESP holds 30% of its equity interest and Iguá 70%.  The amount of R$ 12 is recorded under investee’s
equity, as advance for future capital increase.

As of April 26, 2016, the Annual and Extraordinary Shareholders’ Meeting approved a capital increase in the amount of R$ 2,290
upon the issue of 2,289,796 new registered common shares with no par value, fully subscribed and paid-in, R$ 573 of which using
the minimum mandatory dividends and R$ 1,717 corresponding to additional dividends, both arising from the profit recorded in
2015.

In  March  2017,  the  Company  contributed  R$  303  in  the  investee.  The  amount  is  recorded  in  current  assets,  under  “Other
receivables” and will be reclassified into investments after the resolution and approval of the investee’s shareholders at an Annual
and Extraordinary Shareholders’ Meeting.

The Company pledges as guarantee 100% of its shares in Águas de Andradina.

The operations initiated in October 2010.

Águas de Castilho

As of October 29, 2010, the Company, together with Águas do Brasil – Cab Ambiental, currently Iguá Saneamento S/A (“Iguá”),
incorporated Águas de Castilho, for the purpose of providing water supply and sewage services to the municipality of Castilho.

As of December 31, 2017, the company’s capital was R$ 2,360, and was represented by 2,360,330 registered shares without a par
value. SABESP holds a 30% interest and Iguá 70%.

As of April 26, 2016, the Annual and Extraordinary Shareholders’ Meeting approved a capital increase in the amount of R$ 740
upon the issue of 740 new registered common shares with no par value, fully subscribed and paid-in, R$ 184 of which using the
minimum mandatory dividends and R$ 556 corresponding to additional dividends, both arising from the profit recorded in 2015.

The Company pledges as guarantee 100% of its shares in Águas de Castilho.

The operations initiated in January 2011.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Saneaqua Mairinque

As  of  June  14,  2010,  the  Company,  together  with  BRK  Ambiental  Participações  S/A  (“BRK”)  currently  Odebrecht  Utilities  S/A,
former Foz do Brasil S.A., incorporated Saneaqua Mairinque S/A, with indefinite term, for the purpose of exploring water supply
and sewage services of the municipality of Mairinque.

As  of  December  31,  2017,  the  capital  of  Saneaqua  Mairinque  totaled  R$  2,000,  and  was  represented  by  2,000,000  registered
common shares without a par value. SABESP holds a 30% interest and BRK 70%. The amount of R$ 2,183 is recorded under the
investee’s noncurrent liabilities, as advance for future capital increase.

In  January  2017,  the  Company  contributed  R$  505  in  the  investee.  The  amount  is  recorded  in  current  assets,  under  “Other
receivables” and will be reclassified into investments after the resolution and approval of the investee’s shareholders at an Annual
and Extraordinary Shareholders’ Meeting.

The Company pledges as guarantee 100% of its shares in Saneaqua Mairinque.

The operations initiated in October 2010.

Attend Ambiental

As of August 23, 2010, SABESP, jointly with Companhia Estre Ambiental S.A. (“Estre”), incorporated Attend Ambiental S.A., for
constructing and operating a pretreatment of non-domestic effluent station, sludge transportation and related services in the city
of São Paulo as well as implement similar structures in other areas in Brazil and abroad.

As of December 31, 2017, the capital totaled R$ 13,400, and was represented by 13,400,000 registered common shares without a
par value. SABESP holds a 45% interest and Estre 55%.

The operations initiated in December 2014.

Aquapolo Ambiental S/A.

As of October 8, 2009, the Company, together with Odebrecht Utilities S/A, formerly Foz do Brasil S.A., incorporated Aquapolo
Ambiental S.A., for the purpose of producing, providing and trading reused water for Quattor Química S.A., Quattor Petroquímica
S.A., Quattor Participações S.A. and other companies comprising the Petrochemical Complex.

As  of  December  31,  2017,  the  capital  of  Aquapolo  totaled  R$  36,412,  and  was  represented  by  42,419,045  registered  common
shares without a par value. SABESP holds 49% of its equity interest. As of December 29, 2016, Odebrecht Utilities S/A transferred
to Odebrecht Ambiental Participações em Negócios Industriais S/A (“OAPNI”) all its shares and control and the latter now holds
51% of the shares.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

The Company pledges as collateral 100% of its shares in Aquapolo Ambiental S/A.

The operations initiated in October 2012.

Paulista Geradora de Energia

As of April 13, 2015, the Company acquired shares from Empresa Paulista Geradora de Energia S/A - PGE, jointly        with Servtec
Investimentos  e  Participações  Ltda  ("Servtec)  and  Tecniplan  Engenharia  e  Comércio  Ltda  ("Tecniplan"),  which  operational
purpose is the implementation and commercial exploration of water potential in small hydroelectric power plants (PCHs), located
at the Guaraú and Vertedouro Cascata Water Treatment Stations.

As of December 31, 2017, the capital of Paulista Geradora de Energia was R$ 8,679, represented by 8,679,040 registered common
shares without a par value, in which SABESP holds a 25% interest, Servtec holds 37.5% and Tecniplan 37.5%.

As of December 31, 2017, operations had not initiated yet.

Below is a summary of the investees’ financial information and SABESP’s equity interest:

Company

Equity

Provisioned dividends

Profit (loss) for the year

2017

2016

2015

2017

(*)

2017

(*)

2016

2015

Sesamm

39,262

37,198

32,313

(643)

Águas de Andradina (i)

21,432

Águas de Castilho

Saneaqua Mairinque

Attend Ambiental

Aquapolo Ambiental
Paulista Geradora de
Energia

16,161

3,706

4,090

3,925

4,858

4,480

5,249

18,810

12,340

8,447

8,469

15,191

3,449

3,560

3,084

11,651

8,509

-

-

-

-

-

-

F-59

-

800

219

-

-

-

-

2,707

4,471

933

390

1,324

6,470

(22)

-

(2,040)

22

(153)

(80)

(53)

-

8,601

1,772

631

723

841

689

(40)

6,082

2,371

773

1,145

3,195

(4,569)

(114)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Company

Investments

Dividends
distributed

Equity in the earnings of subsidiaries

Interest percentage

2017

2016

2017

(*)

2017

(*)

2016

2015

2017

2016

2015

Sesamm

14,135

13,391

(231)

Águas de Andradina

Águas de Castilho

Saneaqua Mairinque

Attend Ambiental

Aquapolo Ambiental
Paulista Geradora de
Energia

5,818

1,465

1,298

2,326

9,191

2,111

4,849

1,112

1,227

1,766

6,047

2,117

-

-

-

-

-

-

-

240

66

-

-

-

-

975

1,341

280

117

596

3,170

(6)

-

3,096

2,190

(612)

7

(46)

(36)

(26)

-

532

189

217

378

338

(10)

711

232

344

1,388

(2,239)

(29)

36%

30%

30%

30%

45%

49%

25%

36%

30%

30%

30%

45%

49%

25%

36%

30%

30%

30%

45%

49%

25%

Total

36,344

30,509

(231)

306

6,473

(713)

4,740

2,597

Other investments

588

587

Overall total

36,932

31,096

(*) Refer to changes in the equity of investees, as their financial statements for the year ended December 31, 2016 were disclosed
after disclosure of the Company’s financial statements.

13           Investment properties

As of December 31, 2017, the balance of “Investment properties” is R$57,652 (December 31, 2016 – R$57,968).  As of December
31, 2017 and 2016, the market value of these properties is approximately R$402,000 and R$404,000, respectively.

December 31,

Write-offs and

 2016

disposals

Depreciation

December 31,

 2017

Investment properties

Total

57,968

57,968

(244)

(244)

(72)

(72)

57,652

57,652

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

December 31,

Write-offs

Reversal of

 2015

Transfers

and disposals

estimated losses

Depreciation

December 31,

 2016

Investment properties

Total

56,957

56,957

1,231

1,231

(124)

(124)

10

10

(106)

(106)

57,968

57,968

December 31,

 2014

Transfers

Write-offs and

disposals

Depreciation

December 31,

 2015

Investment properties

Total

54,039

54,039

9,182

9,182

(5,859)

(5,859)

(405)

(405)

56,957

56,957

14           Intangible assets

(a)      Statement of financial position details 

December 31, 2017
Accumulated
amortization

Cost

Net

Cost

December 31, 2016
Accumulated
amortization

Net

Intangible right arising from:

Agreements – equity value

8,893,296

(1,751,682)

7,141,614

9,222,543

(1,739,588)

7,482,955

Agreements – economic value

2,068,402

(634,465)

1,433,937

1,925,361

(543,709)

1,381,652

Program contracts

10,653,292

(3,058,226)

7,595,066

9,209,367

(2,633,346)

6,576,021

Program contracts – commitments

1,113,160

(202,785)

910,375

991,848

(168,632)

823,216

Services contracts – São Paulo

19,388,751

(3,471,736)

15,917,015

17,457,658

(2,904,951)

14,552,707

Software license

Total

688,712

(220,587)

468,125

575,494

(145,257)

430,237

42,805,613

(9,339,481)

33,466,132

39,382,271

(8,135,483)

31,246,788

F-61

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(b)      Changes

  December 31,
2016

Additions

Contract
renewal

Reversal of
estimated
losses

Transfers (i)

Write-offs
and disposals

Amortization

December 31,
2017

Intangible right arising from:

Agreements – equity value 

7,482,955

374,775

(531,818)

Agreements  – 
value 

economic

1,381,652

142,429

-

Program contracts

6,576,021

772,278

531,818

Program 
commitments 

contracts 

–

Services  contracts  –  São
Paulo

Software license

Total

823,216

121,313

14,552,707

1,976,079

430,237

103,424

31,246,788

3,490,298

-

-

-

-

2,078

8

4,834

-

1,663

(2,795)

(185,244)

7,141,614

2,604

(1,163)

(91,593)

1,433,937

(1,784)

(6,606)

(281,495)

7,595,066

-

-

(34,154)

910,375

6,460

(18,346)

(13,848)

(586,037)

15,917,015

-

6,489

-

(72,025)

468,125

13,380

(9,374)

(24,412)

(1,250,548)

33,466,132

  December 31,

2015

Additions

Contract
renewal

Estimated
losses

Transfers

Write-offs
and disposals

Amortization

December 31,
2016

Intangible right arising from:

Agreements – equity value 

7,287,630

391,545

(9,587)

(1,335)

1,014

(6,233)

(180,079)

7,482,955

Agreements  – 
value 

economic

1,353,020

106,307

-

(8)

6

(110)

(77,563)

1,381,652

Program contracts

6,288,575

553,126

9,587

(4,360)

2,023

(5,571)

(267,359)

6,576,021

Program 
commitments 

contracts 

–

Services  contracts  –  São
Paulo

Software license

Total

850,530

5,762

12,367,017

2,697,724

366,854

101,367

28,513,626

3,855,831

-

-

-

-

-

(4,495)

-

-

9,696

(167)

-

(33,076)

823,216

(2,894)

(514,341)

14,552,707

-

(37,817)

430,237

(10,198)

12,572

(14,808)

(1,110,235)

31,246,788

  December 31,
2014

Additions

Contract
renewal

Reversal of
estimated
losses

Transfers

Write-offs
and disposals

Amortization

December 31,
2015

Intangible right arising from:

Agreements – equity value 

7,369,271

574,421

(463,362)

Agreements  – 
value 

economic

1,281,260

140,732

-

747

-

Program contracts

5,379,153

663,399

463,362

4,459

Program 
commitments 

contracts 

–

Services  contracts  –  São
Paulo

Software license

Total

702,909

177,424

10,986,386

1,900,218

260,547

148,248

25,979,526

3,604,442

-

-

-

-

F-62

-

(324)

(4,303)

(188,820)

7,287,630

(17)

(752)

-

(139)

(68,816)

1,353,020

(11,045)

(210,001)

6,288,575

-

(29,803)

850,530

18,879

(4,997)

(30,321)

(503,148)

12,367,017

-

-

-

(41,941)

366,854

24,085

(6,090)

(45,808)

(1,042,529)

28,513,626

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i) As of December 31, 2017, the Company reclassified R$ 24,071 corresponding to the intangible assets of Álvares Florence,
Embaúba, Araçoiaba da Serra, Itapira and Tuiuti to indemnities receivable, in noncurrent assets, which have full allowance for
losses.

The Company started operations in the municipalities of Santa Branca in February 2017 and Pereiras in October. In the second
quarter of 2017, it entered into a contract program with the municipalities of Santa Cruz do Rio Pardo and Cândido Rodrigues. In
the third quarter of 2017, the Company renewed a program contract with the municipality of Itaquaquecetuba and in the fourth
quarter with the municipalities of Taubaté and Taciba; all these contracts are valid for 30 years.

(c)      Intangible arising from concession agreements

The Company operates public service concession agreements for water supply and sewage services mostly based on agreements
that set out rights and obligations relative to the exploration of assets related to the public service (See Note 3.8 (a)).  A general
obligation also exists to return the concession infrastructure to the concession grantor in good working condition at the end of the
concession.

As of December 31, 2017, the Company operated in 368 municipalities in the State of São Paulo (366 as of December 31, 2016). 
Most of these contracts have a 30-year concession period.

The  services  provided  by  the  Company  are  billed  at  a  price  regulated  and  controlled  by  São  Paulo  State  Sanitation  and  Energy
Regulatory Agency (ARSESP).

Intangible rights arising on concession agreements include:

(i)     Concession agreements – equity value

These  refer  to  municipalities  assumed  until  2006,  except  for  the  municipalities  assumed  by  economic  value  through  assets
valuation report prepared by independent experts.  The amortization of assets is calculated according to the straight-line method,
which considers the assets useful life.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(ii)           Concession agreements – economic value

From 1999 through 2006, the negotiations for new concessions were conducted on the basis of the economic and financial result
of the transaction, determined in a valuation report issued by independent appraisers.

The amount determined in the related contract, after the transaction is closed with the municipal authorities, realized through the
subscription  of  the  Company's  shares  or  in  cash,  is  recorded  as  "concession  agreements"  and  amortized  over  the  period  of  the
related  concession  (usually  30  years).  As  of  December  31,  2017  and  2016  there  were  no  amounts  pending  related  to  these
payments to the municipalities.

Intangible assets are amortized on a straight line basis over the period of the concession agreements or for the useful lives of the
underlying assets, whichever is shorter.

(iii)     Program contracts

These  refer  to  the  renewal  of  contracts  previously  referred  to  as  concession  agreements  whose  purpose  is  to  provide  sanitation
services.  The amortization of the assets acquired until the dates of signatures of the program contracts is calculated according to
the straight-line method, which considers the assets’ useful lives.  Assets acquired or built after the signature dates of program
contracts  are  amortized  during  the  contracted  period  (30  years)  or  during  the  useful  lives  of  underlying  assets,  whichever  is
shorter.

(iv)     Program contracts - Commitments

After  the  enactment  of  the  regulatory  framework  in  2007,  renewals  of  concessions  started  to  be  made  through  of  program
contracts.  In some of these program contracts, the Company undertook the commitment to financially participate in social and
environmental  actions.    The  assets  built  and  financial  commitments  assumed  within  the  program  contracts  are  recorded  as
intangible assets and are amortized by the straight-line method in accordance with the duration of the program contract (mostly,
30 years).

As  of  December  31,  2017  and  2016,  the  amounts  not  yet  disbursed  were  recorded  under  “program  contract  commitments”,  in
current  liabilities,  totaling  R$  128,802  and  R$  109,042,  respectively,  and  in  noncurrent  liabilities,  totaling  R$  110,698  and
R$ 69,051, respectively. In 2017, the annual rate of 8.06% (WACC) was applied to calculate the present value adjustment of these
contracts.

(v)     Services agreement with the Municipality of São Paulo

On  June  23,  2010,  the  Company  entered  into  an  agreement  with  the  State  of  São  Paulo  and  the  Municipality  of  São  Paulo  to
regulate  the  provision  of  water  and  sewage  services  in  the  city  of  São  Paulo  for  a  30-year  period,  which  is  extendable  for  an
another 30-year period.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Also on June 23, 2010, an agreement was signed between the state and municipal government, and SABESP and the Sanitation
and  Energy  Regulatory  Agency  of  the  State  of  São  Paulo  (“ARSESP”)  are  the  consenting  and  intervening  parties,  whose  main
aspects are the following:

1.  The  State  and  the  Municipality  of  São  Paulo  grant  to  SABESP  the  right  to  explore  the  sanitation  service  in  the  capital  of  the
State of São Paulo, which consists of the obligation to provide such service and charge the respective tariff for this service;

2. The State and the Municipality sets forth ARSESP as the agency responsible for regulating the tariff, controlling and monitoring
the services.

3. The evaluation model of the contract was the discounted cash flow, which considered the financial and economic sustainability
of SABESP’s operations in the metropolitan region of São Paulo;

4. All operating costs, taxes, investments and the opportunity cost of investors and the creditors of SABESP’s were considered in
the cash flow analysis;

5. The agreement provides for investments established in the agreement comply with the minimum of 13% of the gross revenue
from  the  municipality  of  São  Paulo,  net  of  the  taxes  on  revenues.  Investment  plans  referring  to  SABESP’s  execution  shall  be
compatible  with  the  activities  and  programs  foreseen  in  the  state,  municipal  sanitation  plans,  and  where  applicable,  the
metropolitan plan. The investment plan is not definite and will be revised by Managing Committee every four years, especially as
to investments to be made in the following period;

6.  The  payment  related  to  the  Municipal  Fund  of  Environmental  Sanitation  and  Infrastructure  to  be  applied  in  the  sanitation
service within the municipality must be recovered through the tariffs charges.  Such payment represents 7.5% of the total revenue
from  the  municipality  of  São  Paulo,  net  of  the  taxes  on  revenue  and  delinquency  in    the  period,  recognized  in  profit  or  loss,  as
operating  cost;

7.  The  opportunity  cost  of  the  investors  and  the  creditors  was  established  by  the  Weighted  Average  Cost  of  Capital  (WACC)
methodology.  The WACC was the interest rate used to discount the cash flow of the operation; and

8.  The  agreement  considers  the  recovery  of  net  assets  in  operation,  preferably  evaluated  through  equity  valuation  or  carrying
amount monetarily restated, as defined by ARSESP.  In addition, the agreement provides for the remuneration of investments to
be made by SABESP, so that there is no residual value at the end of the agreement.

Referring  to  the  recovery  through  tariff,  mentioned  in  item  6  above,  of  transfer  to  the  Municipal  Fund  of  Environmental
Sanitation and Infrastructure, ARSESP issued in April 2013, the Resolution no. 413, postponing the application of Resolution no.
407  until  the  conclusion  of  the  tariff  revision  process,  the  transfer  to  the  bill  of  services  of  amounts  referring  to  the  municipal
charges which were stipulated in Resolution no. 407. The postponement to apply Resolution no. 407 was due to a request by the
São Paulo State Government to analyze, among other things, methods to reduce the impact on consumers.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

As of April 18, 2014, ARSESP Resolution no. 484 was published with the final results of SABESP’s Tariff Revision, however, both
the  São  Paulo  Municipal  Government,  through  Official  Letter  no.  1,309/14-SGM/GAB  and  the  São  Paulo  State  Government
through a petition filed by the São Paulo State Office, through the Official Letter ATG/Official Letter no. 092/14-CC, requested a
postponement of the effects of ARSESP Resolution no. 413, published in the São Paulo State Official Gazette on March 20, 2013,
until the conclusion of the revision of the Agreement entered into between the São Paulo Municipal Government, the São Paulo
Statement Government and SABESP.

By means of Resolution no. 488 of May 7, 2014, ARSESP maintained the suspension of the effectiveness of ARSESP Resolution
no. 407, published on March 22, 2013, until the results obtained in the revision of the Agreement entered into by the São Paulo
Municipal Government, the São Paulo State Government and SABESP postponing authorization for the transfer to the bill of the
services related to the legally established municipal fees that, by force of the Program Agreements and Water Supply and Sewage
Services Agreements, should be included in the Tariff Revision.

The  agreement  represents  55.38%  of  the  total  revenue  of  the  Company  as  of  December  31,  2017,  and  ensures  the  judicial  and
assets security, adequate return to shareholders and quality services to its customers.

The municipality of São Paulo and the Company did not conclude an agreement to equalize financial pending issues existing until
the  signature  date  of  the  Agreement  related  to  the  rendering  of  water  supply  and  sewage  services  to  the  real  properties  of  the
municipality, and for that reason, the Company filed a suit to collect these accounts, which are accrued for losses.

(d)      Capitalization of interest and other finance charges

In  2017,  the  Company  capitalized  interest  and  inflation  adjustment,  including  related  foreign  currency  exchange  effects  in
concession intangible assets, totaling R$649,048, including the São Lourenço Production System and Leases (R$700,743 in 2016
and R$466,544 in 2015) during the construction period.

(e)            Construction margin

The Company acts as a principal responsible to construct and install the infrastructure related to the concession, using own efforts
or hiring outsourcing services, receiving the risks and benefits.

As a consequence, the Company recognizes revenue from construction service corresponding to the cost of construction increased
by gross margin. Generally, the constructions related to the concessions are performed by third parties, in such case, the margin of
the Company is lower, normally, to cover eventual administration costs, and the responsibility of the primary risk.  In 2017 and
2016 the margin was 2.3%.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Construction margin for 2017, 2016 and 2015 were R$70,335, R$81,513 and R$72,908, respectively.

(f) Expropriations

As a result of the construction of priority projects related to water and sewage systems, the Company was required to expropriate
third-parties' properties, and the owners of these properties will be compensated either amicably or through courts.

The costs of these expropriations are recorded as concession intangible assets after the transaction is concluded. In 2017, the total
amount related to expropriations was R$19,576 (R$40,452 in 2016 and R$66,801 in 2015).

(g)      Public-Private Partnership - PPP

SABESP  carries  out  operations  related  to  the  PPPs  mentioned  below.  These  operations  and  their  respective  obligations  and
guarantees are supported by agreements executed according to Law 11,079/04.

Alto Tietê Production System

The  Company  and  the  special  purpose  entity  CAB-Sistema  Produtor  Alto  Tietê  S/A,  formed  by  Galvão  Engenharia  S.A.  and
Companhia  Águas  do  Brasil  –  Cab  Ambiental,  signed  in  June  2008  the  contract  of  public-private-  partnership  of  Alto  Tietê
production system.

The contract last 15 years which purpose is to expand the capacity of treated water of Taiaçupeba from 10 thousand to 15 thousand
of liters per second, whose operation began in October 2011.

As of December 31, 2017 and 2016, the amounts recognized as intangible asset related to PPP were R$371,862 and R$382,103,
respectively.  In 2017, a discount rate of 8.20% p.a. was used to calculate the adjustment to present value of the agreement.

On  a  monthly  basis,  SABESP  assigns  funds  from  tariffs  to  the  SPE  CAB  Sistema  Produtor  Alto  Tietê  S/A,  in  the  amount  of
R$10,012, corresponding to the monthly remuneration.  This amount is annually adjusted by the IPC – FIPE and is recorded in a
restricted account, pursuant to the contractual operating proceeding.  Should SABESP comply with its monthly obligations with
the SPE, the funds from the restricted account will be released.

The guarantee is effective since the beginning of the operation and will be valid until the conclusion, termination, intervention,
annulment or caducity of the Administrative Concession, or other extinction events provided for in the Concession Agreement or
in the law applicable to administrative concessions, including in the event of bankruptcy or extinction of the SPE.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

São Lourenço Production System

SABESP  and  the  special  purpose  entity  Sistema  Produtor  São  Lourenço  S/A,  composed  of  Construções  e  Comércio  Camargo
Corrêa S/A and Construtora Andrade Gutierrez S/A, in August 2013 signed the public-private partnership agreements of the São
Lourenço Production System.

The objective of the contract is: a) the construction of a water producing system, mainly consisting of a water pipeline connecting
Ibiúna to Barueri, a water collection station in Ibiúna, a water treatment station in Vargem Grande Paulista and water reservoirs;
and b) the provision of services for a 25-year term, aiming at rendering services to operate the dehydration system, drying and
final disposal of sludge, maintenance and works of the São Lourenço Production System.  Works started in April 2014.

The work was inaugurated on April 3, 2018.

The  estimated  amount  monetarily  restated  through  December  31,  2017  is  approximately  R$7.9  billion.    This  amount  was
calculated considering the early startup mentioned above.

After the beginning of the operations, every month SABESP will transfer to the SPE Sistema Produtor São Lourenço S/A funds
from  tariffs  arising  from  the  services  provided,  in  the  amount  of  R$24.4  million,  equivalent  to  the  monthly  remuneration  plus
interest  and  charges.    The  amount  above  will  be  annually  restated  by  the  IPC  -  FIPE  and  should  be  monthly  recorded  in  a
restricted  account,  in  accordance  with  the  operating  procedures  of  the  agreements.    Should  SABESP  perform  its  monthly
obligations with the SPE, the funds from the restricted account will be released.

The  guarantee  will  become  effective  as  of  the  beginning  of  the  system’s  appropriate  operation,  duly  accepted  by  SABESP,  valid
until the occurrence of any of the following events, whichever occurs first:  (i) the original payment date of the last installment of
interest  /  amortization  of  the  principal  taken  out  by  the  SPE  to  execute  the  works;  (ii)  the  end,  termination,  intervention,
annulment, caducity of the Administrative Concession, or other extinction events provided for in the Concession Agreement or in
the law applicable to administrative concessions, including bankruptcy or extinction of the SPE.

As  of  December  31,  2017  and  2016,  the  carrying  amount  recorded  in  the  Company’s  intangible  assets,  related  to  this  PPP,
amounted to R$2,818,805 and R$1,951,538, respectively.  Intangible assets are accounted for based on the physical evolution of
the construction which, as of December 31, 2017, was approximately 89%, with a counter-entry in the Private Public Partnership
(PPP)  liabilities  account.    In  2017,  a  discount  rate  of  7.80%  p.a.  was  used  to  calculate  the  adjustment  to  present  value  of  the
agreement.

The obligations assumed by the Company as of December 31, 2017 and 2016 are shown in the table below, and the increase in
intangible assets and liabilities was mainly due to the progress of PPP São Lourenço works in 2017.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

December 31, 2017

December 31, 2016

Current
liabilities

Noncurrent
liabilities

Total liabilities

Noncurrent
liabilities

Current
liabilities

Total
liabilities

Alto Tietê

São Lourenço

35,083
24,924

282,501
2,728,908

317,584
2,753,832

31,898
-

309,858
1,907,662

341,756
1,907,662

Total

60,007

3,011,409

3,071,416

31,898

2,217,520

2,249,418

(h)            Works in progress

The  amount  of  R$10,387  million  is  recorded  under  intangible  assets  as  works  in  progress  as  of  December  31,  2017  (R$9,156
million  as  of  December  31,  2016),  and,  in  2017,  the  major  projects  are  located  in  the  municipalities  of  São  Paulo,  Franca  and
Itanhaém,  totaling  R$6,497  million  (including  R$2,819  million  from  PPP  São  Lourenço),  R$253  million  and  R$208  million,
respectively.

(i)       Amortization of intangible assets

The amortization average rate totaled 3.9% as of December 31, 2017, 2016 and 2015.

(j) Software license of use   

The software license of use is capitalized based on the costs incurred to acquire software and make them ready for use. As of April
10, 2017, the Company implemented the Integrated Business Management System (Enterprise Resource Planning – SAP ERP),
which includes the administrative/financial module. The implementation of the comercial module is in progress.

15           Property, plant and equipment

(a)      Statement of financial position details

Land

Buildings

Equipment

Transportation equipment

Furniture and fixtures

Other

Total

December 31, 2017
Accumulated
depreciation

-

(36,653)

Cost

92,507

79,013

December 31, 2016

Cost

92,507

42,360

Accumulated
depreciation

92,494

77,548

Cost

-

(34,286)

330,753

(226,950)

103,803

338,696

(189,556)

10,862

24,430

1,122

(7,182)

(12,614)

(238)

3,680

11,816

884

11,141

23,633

1,181

(6,610)

(11,647)

(211)

Accumulated
depreciation

92,494

43,262

149,140

4,531

11,986

970

538,687

(283,637)

255,050

544,693

(242,310)

302,383

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(b)  Changes

Land

Buildings

Equipment

Transportation equipment

Furniture and fixtures

Other

Total

Land

Buildings

Equipment

Transportation equipment

Furniture and fixtures

Other

Total

December 31, 2016

Additions

Transfers

Write-offs and
disposals

Depreciation December 31, 2017

92,494

43,262

149,140

4,531

11,986

970

302,383

-

86

17,627

-

1,207

-

18,920

13

1,358

(15,945)

(33)

(75)

(15)

(14,697)

-

-

(178)

(27)

(54)

  (20)

(279)

-

(2,346)

(46,841)

(791)

(1,248)

(51)

92,507

42,360

103,803

3,680

11,816

884

(51,277)

255,050

December 31, 2015

Additions

Transfers

Write-offs and
disposals

Depreciation

December 31,
 2016

102,708

45,891

162,218

5,692

8,418

149

-

-

26,061

214

511

845

(10,214)

(911)

(6,380)

(556)

4,258

-

325,076

27,631

(13,803)

-

(45)

(181)

-

(10)

-

(236)

-

(1,673)

(32,578)

(819)

(1,191)

(24)

92,494

43,262

149,140

4,531

11,986

970

(36,285)

302,383

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

December 31, 2014

Additions

Transfers

Write-offs and
disposals

Depreciation

December 31,
 2015

100,533

42,515

146,922

7,613

7,124

138

1,032

1,383

51,610

135

634

-

304,845

54,794

1,143

3,347

(8,123)

(1,109)

1,629

21

(3,092)

-

-

(340)

(10)

(23)

-

(373)

-

(1,354)

(27,851)

(937)

(946)

(10)

102,708

45,891

162,218

5,692

8,418

149

(31,098)

325,076

Land

Buildings

Equipment

Transportation equipment

Furniture and fixtures

Other

Total

(c)      Depreciation

The Company annually revises the depreciation rates of: buildings – 3.0%; equipment- 18.0%; transportation equipment - 10%
and furniture, fixture and equipment – 7.5%.  Lands are not depreciated.

The depreciation average rate was 13.6%, 10.9% and 11.5%, as of December 31, 2017, 2016 and 2015, respectively.

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

16           Borrowings and financing

 Borrowings and financing outstanding
balance
Financial institution

Local currency

 10th issue debentures

 12th issue debentures

 14th issue debentures

 15th issue debentures

 17th issue debentures

 18th issue debentures

 19th issue debentures

 20th issue debentures

 21th issue debentures

 Brazilian Federal Savings Bank

 Brazilian Development Bank - BNDES
BAIXADA SANTISTA

 Brazilian Development Bank - BNDES PAC

 Brazilian Development Bank - BNDES PAC II
9751

 Brazilian Development Bank - BNDES PAC II
9752

 Brazilian Development Bank - BNDES ONDA
LIMPA

 Brazilian Development Bank - BNDES TIETÊ
III

 Brazilian Development Bank - BNDES 2015

 Leases

 Other

 Interest and charges

Total in local currency

 Borrowings and financing outstanding
balance
Financial institution

Foreign currency

 Inter-American Development Bank - BID 713 
(US$25,097 thousand in December 2016)

Inter-American Development Bank - BID 1212  –
US$82,225 thousand (US$92,503 thousand in
December 2016)

 Inter-American Development Bank - BID 2202
– US$444,871 thousand (US$438,071 thousand
in December 2016)

 International Bank of Reconstruction and
Development -BIRD – US$91,286 thousand
(US$79,946 thousand in December 2016)

 Deutsche Bank – US$150,000 (US$150,000
thousand in December 2016)

 Eurobonds – US$350,000 thousand
(US$350,000 thousand in December 2016)

 JICA 15 – ¥13,829,160 thousand (¥14,981,590
thousand in December 2016)

 JICA 18 – ¥12,433,920 thousand (¥13,470,080
thousand in December 2016)

 JICA 17 – ¥1,534,959 thousand (¥1,596,251
thousand in December 2016)

 JICA 19 – ¥29,777,232 thousand (¥27,596,009
thousand in December 2016)

December 31, 2017

December 31, 2016

Current

Noncurrent

Total

Current

Noncurrent

Total

41,702

45,450

40,503

346,414

144,391

33,020

-

250,000

-

78,487

16,782

11,143

4,334

2,367

80,953

294,702

141,351

345,788

781,922

194,872

-

246,890

499,628

122,655

340,152

181,854

692,202

926,313

227,892

-

496,890

499,628

1,154,599

1,233,086

16,782

33,564

50,028

22,991

61,171

27,325

40,967

45,450

39,802

97,692

140,144

32,436

199,461

-

-

59,199

16,603

10,987

4,288

120,343

340,165

178,571

672,657

904,094

223,840

-

495,533

-

161,310

385,615

218,373

770,349

1,044,238

256,276

199,461

495,533

-

1,088,160

1,147,359

33,207

49,810

60,293

27,007

71,280

31,295

19,526

21,893

2,341

21,659

24,000

23,469

146,461

169,930

23,219

168,083

191,302

30,378

280,825

311,203

30,054

307,862

337,916

10,050

17,573

1,466

101,855

397,922

544,044

9,477

-

407,972

561,617

10,943

101,855

1,199,384

5,228,761

6,428,145

-

14,914

746

121,605

879,908

233,967

537,602

10,829

-

233,967

552,516

11,575

121,605

5,423,872

6,303,780

December 31, 2017

December 31, 2016

Current

Noncurrent

Total

Current

Noncurrent

Total

-

-

-

81,794

-

81,794

34,000

238,000

272,000

33,499

267,979

301,478

81,757

1,375,358

1,457,115

75,143

1,339,803

1,414,946

-

301,665

301,665

248,100

242,343

490,443

-

1,155,331

1,155,331

-

-

-

260,224

260,224

480,244

480,244

1,137,395

1,137,395

33,881

372,696

406,577

32,175

386,111

418,286

30,463

334,849

365,312

28,930

346,889

375,819

2,507

41,835

44,342

1,205

42,675

43,880

-

873,383

873,383

-

768,463

768,463

 BID 1983AB – US$82,404 thousand

79,201

189,990

269,191

78,030

263,921

341,951

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(US$106,346 thousand in December 2016)

 Interest and charges

Total in foreign currency

37,462 

547,371
-

 -  

5,125,450
-

37,462 

5,672,821
-

35,883 

366,659
81,794

-

5,293,704
-

35,883 

5,660,363
81,794

Total borrowings and financing

1,746,755

10,354,211

12,100,966

1,246,567

10,717,576

11,964,143

Exchange rate as of December 31, 2017: US$3.3080; ¥0.02940 (as of December 31, 2016: US$3.2591; ¥0.02792).
As of December 31, 2017, the Company did not have balances of borrowings and financing, raised during the year, to mature within 12 months.

F-72

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Local currency

Guarantees

Maturity

Annual interest rates

Inflation adjustment

10th issue debentures

12th issue debentures

14th issue debentures

15th issue debentures

Own funds

2020

TJLP +1.92% (Series 1 and 3) and 9.53% (Series 2)

IPCA (Series 2)

Own funds

2025

 TR + 9.5%

Own funds

Own funds

2022

2019

TJLP +1.92% (Series 1 and 3) and 9.19% (Series 2)

IPCA (Series 2)

CDI + 0.99% (Series 1) and 6.2% (Series 2)

IPCA (Series 2)

17th issue debentures

Own funds

2023

CDI +0.75 (Series 1) and 4.5% (Series 2) and4.75%
(Series 3)

IPCA (Series 2 and 3)

18th issue debentures

19th issue debentures

Own funds

2024

TJLP 1.92 % (Series 1 and 3) and 8.25% (Series 2)

IPCA (Series 2)

Own funds

2017

CDI + 0.80% to 1.08%

20th issue debentures

Own funds

2019

CDI + 3.80%

21th issue debentures

Own funds

2022

CDI + 0.60% e CDI+ 0.90%

Brazilian Federal Savings Bank

Own funds

2018/2038

5% to 9.5%

TR

Brazilian Development Bank - BNDES BAIXADA

SANTISTA

Own funds

2019

Brazilian Development Bank - BNDES PAC

Own funds

2023

Brazilian Development Bank - BNDES PAC II 9751

Own funds

2027

Brazilian Development Bank - BNDES PAC II 9752

Own funds

2027

Brazilian Development Bank - BNDES ONDA LIMPA

Own funds

2025

Brazilian Development Bank - BNDES TIETÊ III

Own funds

2028

Brazilian Development Bank - BNDES 2015

Own funds

2035

2.5%+TJLP

2.15%+TJLP

1.72%+TJLP

1.72%+TJLP

1.92%+TJLP

1.66%+TJLP

2.5%+TJLP

Leases

Other

2035

7.73% to 10.12%

Own funds

2018/2025

12% (Presidente Prudente) and TJLP + 1.66% (FINEP)

IPC

TR

F-74

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

Foreign currency

Guarantees

Maturity

Annual interest rates

Exchange
rate
changes

Inter-American Development Bank - BID 1212  - US$82,225
thousand

Inter-American Development Bank - BID 2202  - US$444,871
thousand

Government

2025

2.74% (*)

US$

Government

2035

2.33% (*) 

US$

International Bank for Reconstruction and Development - BIRD
US$91,286 thousand

Government

Deutsche Bank US$150,000 thousand

Eurobonds – US$350,000 thousand

JICA 15 – ¥13,829,160 thousand

JICA 18 – ¥12,433,920 thousand

JICA 17– ¥1,534,959 thousand

JICA 19– ¥29,777,232 thousand

BID 1983AB – US$82,404 thousand

es comprising LIBOR + contractually defined spread.

- 

- 

Government

Government

Government

Government

- 

F-75

2034

2019

2020

2029

2029

2035

2037

2023

1.71% (*)

US$

Libor+4.50%(*)

6.25%

1.8% and 2.5%

1.8% and 2.5%

1.2% and 0.01%

1.7% and 0.01%

US$

US$

Yen

Yen

Yen

Yen

Libor + 1.88% to 2.38% (*)

US$

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(i) Payment schedule – accounting balances as of December 31, 2017

2018

2019

2020

2021

2022

2023

2024 to 2038

TOTAL

LOCAL CURRENCY

Debentures

901,480

1,022,262

576,364

375,660

354,807

159,790

97,223

3,487,586

Brazilian  Federal 
Bank

Savings

BNDES

Leasing

Other

Interest and charges

TOTAL 
CURRENCY

IN 

LOCAL

FOREIGN CURRENCY

78,487

98,523

17,573

1,466

101,855

69,516

112,594

32,766

1,370

-

71,998

94,467

34,384

1,370

-

75,721

94,019

36,143

1,370

-

79,743

94,019

38,056

1,370

-

71,768

785,853

1,233,086

88,335

451,101

1,033,058

40,775

361,920

561,617

1,370

-

2,627

-

10,943

101,855

1,199,384

1,238,508

778,583

582,913

567,995

362,038

1,698,724

6,428,145

BID

BIRD

115,757

-

115,757

10,056

115,757

115,757

115,757

115,758

1,034,572

1,729,115

20,112

20,112

20,112

20,113

211,160

301,665

Deutsche Bank

248,100

242,343

-

Eurobonds

JICA

BID 1983AB

Interest and charges

FOREIGN

TOTAL 
CURRENCY

IN 

Overall Total

-

66,851

79,201

37,462

-

1,155,331

114,173

58,526

-

114,173

58,526

-

-

-

114,173

25,446

-

-

-

114,173

25,446

-

-

-

-

-

490,443

1,155,331

114,173

1,051,898

1,689,614

22,046

-

-

-

269,191

37,462

547,371

540,855

1,463,899

275,488

275,488

272,090

2,297,630

5,672,821

1,746,755

1,779,363

2,242,482

858,401

843,483

634,128

3,996,354

12,100,966

F-76

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

(ii)   Changes

December

31, 2016 Funding

Borrowings
costs

Lease

Monetary
variation
and
exchange
rate
changes

Inflation
adjustment /
update
incorporated
interest -
Capitalized

Interest
and fees
paid

Amortization

Accrued
interest

Provision
for interest
and fees -
Capitalized

Borrowings
costs -
expenses

December
31, 2017

LOCAL
CURRENCY

Debentures
Brazilian
Federal
Savings Bank

BNDES

Leasing

Other
TOTAL IN
LOCAL
CURRENCY

FOREIGN
CURRENCY

BID

BIRD
Deutsche
Bank

JICA

BID 1983AB
TOTAL IN
FOREIGN
CURRENCY

Overall Total

3,641,912

500,000

(1,157)

1,150,691

144,654

946,984

171,153

552,516

11,677

-

-

-

-

-

-

-

- 24,693

-

-

51,768

-

(301,493)

(597,794)

176,780

103,215

3,611

3,576,842

5,495

5,405

-

116

1,415

(95,854)

(65,836)

78,283

2,512

(78,466)

(87,993)

33,938

-

-

-

(876)

(15,593)

(750)

-

779

17,826

48,294

-

31

-

1,236,674

209

1,042,036

-

-

561,616

10,977

6,303,780

815,807

(1,157) 24,693

62,784

3,927

(476,689)

(797,966)

289,780

169,366

3,820

6,428,145

1,811,664

96,889

(2,497)

261,337

35,710

485,090

Eurobonds

1,141,469

-

-

1,617,215

343,588

63,909

-

-

(720)

-

(287)

(82)

-

-

-

-

-

-

-

(15,193)

2,874

7,335

17,115

82,563

1,609

40,228

(38,654)

(189,280)

22,547

2,837

(4,049)

-

-

(31,774)

(85,338)

-

-

-

2,525

(28,652)

-

(10,931)

(65,702)

(75,610)

3,662

21,286

55,046

27,602

6,858

16,803

888

11,925

29,529

1,115

3,715

750

19

1,743,257

303,278

3,584

496,726

821

160

1,158,642

1,700,448

1,323

270,470

96,303

45,590 (199,398)

(330,592)

137,001

63,975

6,657

5,672,821

5,660,363

196,508

(3,586)

11,964,143

1,012,315

(4,743) 24,693

159,087

49,517

(676,087)

(1,098,558)

426,781

233,341

10,477

12,100,966

F-77

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated

LOCAL
CURRENCY

Debentures
Brazilian
Federal
Savings Bank

BNDES

Leasing

Other
TOTAL IN
LOCAL
CURRENCY

FOREIGN
CURRENCY

BID

BIRD
Deutsche
Bank

JICA

BID 1983AB
TOTAL IN
FOREIGN
CURRENCY

Overall Total

December

31, 2015 Funding

Borrowings
costs

Lease

Monetary
variation
and
exchange
rate
changes

Inflation
adjustment /
update
incorporated
interest -
Capitalized

Interest
and fees
paid

Amortization

Accrued
interest

Provision
for interest
and fees -
Capitalized

Borrowings
costs -
expenses

December
31, 2016

4,203,127

- 

(1,241)

1,067,464

113,310

-

696,329

313,072

(2,242)

-

-

-

534,894

-

1,962

10,014

32,111

-

-

105,385

-

(375,027)

(663,468)

214,245

154,814

4,077

3,641,912

15,619

6,405

(89,896)

(52,315)

63,813

-

-

31

-

-

-

(55,806)

(76,469)

38,172

-

(905)

(14,489)

-

(655)

1,149

26,291

33,768

-

81

-

1,150,691

160

946,984

-

-

552,516

11,677

6,503,776

436,396

 (3,483)

32,111

121,035

6,405

(521,634)

(807,396)

317,379

214,954

4,237

6,303,780

2,194,353

113,543

(3,819)

238,940

59,983

-

-

469,020

 (9,167)

Eurobonds

1,922,256

-

1,756,969

188,755

505,306

-

-

(468)

(236)

(396,817)

(40,213)

19,845

(334,915)

(259,455)

(78,910)

-

-

-

-

-

-

-

37,412

(42,429)

(133,063)

21,792

20,100

-

-

1,916

2,042

1,971

(1,876)

-

-

-

(128,283)

(437,752)

69,002

5,771

(33,799)

- 

(11,923)

(73,854)

(83,247)

30,791

6,548

597

2,804

50,239

2,362

4,772

592

19

546

922

143

1,278

1,811,664

261,337

485,090

1,141,469

1,617,215

343,588

6,617,824

831,301

(13,690)

(1,090,465)

45,154

(218,310)

(727,916)

132,091

80,874

3,500

5,660,363

13,121,600

1,267,697

(17,173)

32,111

(969,430)

51,559 (739,944)

(1,535,312)

449,470

295,828

7,737

11,964,143

F-78

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(a)         Debentures

Balance as of December 31, 2017 is stated net of borrowings costs in the amount of R$6,223 (R$8,163 as of December 31, 2015),
which will be amortized during the same maturity period of each contract.

(i)        Main events

As of January 16, 2017, the Company amortized the second installment of the 17th issue of series 1, totaling R$140,144.

 As of February 15, 2017, the Company fully amortized the 15th issue of series 1, totaling R$104,809, referring to principal and
interest.

 As of June 20, 2017, the Company fully amortized the 19th debenture issue, totaling R$ 212,648, referring to principal and
interest.

  As  of  July  13,  2017,  the  Company  held  the  21st  issue  of  unsecured  debentures,  not  convertible  into  shares,  totaling  R$
500,000,  in  two  series,  the  first  of  which  totaling  R$  150,000,  in  a  single  installment  maturing  on  June  15,  2020  and
remuneration by the CDI + 0.60% p.a., and the second series, totaling R$ 350,000, in two installments maturing on June 15,
2021 and June 15, 2022, respectively and remuneration by the CDI + 0.90% p.a. The proceeds of the debenture issue will be
allocated to refinance financial commitments maturing in 2017 and to recompose the Company’s cash.

 The covenants agreed for the 21st issue debentures are:

 Calculated every quarter upon the disclosure of interim or annual financial statements:

-  Net debt/EBITDA: lower than or equal to 3.65;

-  Adjusted EBITDA/paid financial expenses: equal to or higher than 1.5;

-  Disposal of operating assets, extinguishment of license, loss of concession or loss of Issuer’s capacity to execute and
operate the basic sanitation public utilities in areas of the State of São Paulo territory, which considered individually
or  jointly  during  the  deed’s  effectiveness,  result  in  a  reduction  of  net  sales  revenue  and/or  services  revenue  of  the
Issuer  exceeding  twenty-five  percent  (25%).  The  limit  established  above  will  be  calculated  quarterly,  taking  into
account the Issuer’s operating income for the twelve (12) months preceding the end of each quarter and applying the
financial information disclosed by the Issuer.

 Non-compliance with the covenant clauses, during, at least, two consecutive quarters, or also two nonconsecutive quarters
within a twelve-month period shall result in the early maturity of the agreement.

 The indenture has a cross acceleration clause, i.e., the early maturity of any of the Company’s debts, in and individual or
aggregate  amount  equal  to  or  higher  than  R$  145  million,  adjusted  by  the  IPCA  inflation  index  as  of  the  issue  date,
constitutes a default event and may result in the early maturity of the obligations arising from the Debentures.

F-79

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(ii)      Covenants

For the outstanding contracts, the Company has the following restrictive clauses “covenants”:

Applicable to the 10th issue, 14th issue and 18th issue:

Financial covenants applicable to the financing agreements entered into with the BNDES, except for agreement no 08.2.0169.1
(PAC):

The financing agreements entered into with the BNDES specify two ranges in which the Company needs to maintain its Adjusted
EBITDA  /  Adjusted  Financial  Expenses,  Adjusted  Net  Debt  /  Adjusted  EBITDA,  and  Other  Onerous  Debt  /  Adjusted  EBITDA
ratios. 

These  agreements  also  specify  a  guarantee  mechanism  in  which  the  Company  needs  to  ensure  that  a  portion  of  the  monthly
receivables  amount  is  daily  recorded  in  a  fiduciary  account  linked  to  the  BNDES.  In  this  process,  every  day,  after  the  BNDES
notifies the depositary bank that the Company is not in default, this portion of the monthly receivables amount is transferred to a
Company current account.

The renegotiated/amended covenants are:

A.   Maintenance of the following ratios, quarterly calculated and related to accrued amounts over the last 12 months, upon the
disclosure  of  reviewed  interim  financial  statements  or  audited  annual  financial  statements  entails  the  need  to  record
R$225.9 million per month in a fiduciary account linked to the BNDES:

·       Adjusted EBITDA / Adjusted financial expenses equal to or higher than 3.50;
·       Adjusted net debt / Adjusted EBITDA equal to or lower than 3.00;
·       Other onerous debt (*) / Adjusted EBITDA equal to or lower than 1.00.

(*)“Other Onerous Debts” correspond to the sum of social security liabilities, health care plan, installment payment of tax
debts and installment payment of debts with the Electricity supplier.

B.   In case of failure to comply with one or more ratios specified in item A, in two or more quarters, consecutive or not, within
twelve  months,  the  Company  will  be  failing  to  comply  with  the  first  range  of  ratios  and  the  portion  of  the  monthly
receivables to be recorded in a fiduciary account linked to the BNDES will be automatically increased by 20%, if the ratios
are maintained in the following range:

F-80

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

·       Adjusted EBITDA / Adjusted financial expenses lower than 3.50 and equal to or higher than 2.80;
·       Adjusted net debt / adjusted EBITDA equal to or lower than 3.80 and higher than 3.00;
·       Other onerous debt / Adjusted EBITDA equal to or lower than 1.30 and higher than 1.00.

C.        The  failure  to  achieve  one  or  more  than  one  ratio  stipulated  in  item  B,  and/or  the  Company  does  not  comply  with  the
automatic reinforcement of guarantee under the terms of item B, the Company will be failing to comply with the covenant
terms and the BNDES may, at its sole discretion:

·       require the creation of additional guarantees, not below 30 days, within term to be defined by it through notice;
·       suspend the release of funds; and/or
·       declare the early maturity of the financing agreements.

As of December 31, 2017, the amount of R$225.9 million was guaranteed for the agreements above (excluding the guarantee of
agreement no 08.2.0169.1).

Financial covenants applicable to financing agreement no. 08.2.0169.1 entered into with the BNDES:

·       Adjusted EBITDA / adjusted net operating revenue: equal to or higher than 38%;
·       Adjusted EBITDA /adjusted financial expenses: equal to or higher than 2.35;
·       Adjusted net debt / adjusted EBITDA: equal to or lower than 3.20.

The BNDES will annually verify if the ratios have been complied with by analyzing the annual audited financial statements, which
must  be  presented  to  the  BNDES  or  published  by  April  30  of  the  subsequent  year  referring  to  the  financial  statements.    If  the
Company  complies,  cumulatively,  with  the  ratios  above,  the  BNDES  will  reduce  the  interest  stipulated  in  the  agreement  from
2.15% p.a. to 1.82% p.a., from June 16 of the year when the analysis is carried out to June 15 of the subsequent year.

The agreements also have a cross default clause, i.e., the early maturity of any of the Company’s debts, the amount of which may
anyhow compromise the settlement of its obligations provided for in the Indenture deed shall imply the early maturity of such
agreement.

Applicable to the 12th issue:

Calculated every quarter upon the disclosure of interim or annual financial statements:

-  Adjusted  current  ratio  (current  assets  divided  by  current  liabilities,  excluding  from  current  liabilities  the  current  portion  of

noncurrent debts incurred by the Company that are recorded in current liabilities) higher than 1.0;

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

- EBITDA to paid financial expenses ratio equal to or higher than 1.5;

- Disposal of operating assets, extinguishment of license, loss of concession or loss of Issuer’s capacity to execute and operate the
basic sanitation public utilities in areas of the State of São Paulo territory, which considered individually or jointly during the
contract’s  effectiveness,  result  in  a  reduction  of  net  sales  revenue  and/or  services  revenue  of  the  Issuer  exceeding  twenty-five
percent (25%).  The limit established above will be calculated quarterly, taking into account the Issuer’s operating income for the
twelve (12) months preceding the end of each quarter and applying the financial information disclosed by the Issuer; and

Noncompliance with these obligations only will be characterized when verified in its interim financial statements, during at least,
two consecutive quarters, or also two nonconsecutive quarters within a twelve-month period.

In case of noncompliance with the covenants, the trustee should call an extraordinary debenture holders' meeting within 48 hours
from the acknowledgement of the noncompliance to resolve on the declaration of early maturity of the debentures.

This  issue  has  an  early  maturity  clause,  in  case  there  is  a  downgrade,  by  more  than  two  levels,  of  the  “brAA-”  risk  rating  in
national scale originally attributed to this issue’s Debentures by the Rating Agency, always taking into consideration the Standard
& Poor’s rating table. As of December 31, 2017, SABESP’s rate was “brAA-”.

The agreement also has a cross default clause, i.e. the early maturity of any of the Company’s debts, equal to or exceeding R$50
million, adjusted by IPCA variation as of the issue date, due to contractual default, the amount of which may anyhow compromise
the settlement of the Company’s monetary obligations arising from the Issue, shall imply the early maturity of this agreement.

Applicable to the 15th issue, 17th issue and 20th issues:

Calculated every quarter upon the disclosure of interim or annual financial statements:

- Adjusted total Debt/EBITDA: lower than or equal to 3.65;

- EBITDA/ paid financial expenses: equal to or higher than 1.5;

- Disposal of operating assets, extinguishment of license, loss of concession or loss of Issuer’s capacity to execute and operate the
basic sanitation public utilities in areas of the State of São Paulo territory, which considered individually or jointly during the
contract’s  effectiveness,  result  in  a  reduction  of  net  sales  revenue  and/or  services  revenue  of  the  Issuer  exceeding  twenty-five
percent (25%).  The limit established above will be calculated quarterly, taking into account the Issuer’s operating income for the
twelve (12) months preceding the end of each quarter and applying the financial information disclosed by the Issuer; and

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Non-compliance with the covenant clauses, during, at least, two consecutive quarters, or also two nonconsecutive quarters within
a twelve-month period shall result in the early maturity of the agreement.

The  agreements  have  a  cross  acceleration  clause,  i.e.,  the  early  maturity  of  any  of  the  Company’s  debts,  equal  to  or  exceeding
R$90 million (for the 19th and 20th issues, amount equal to or exceeding R$120 million), adjusted by IPCA variation as of the
issue  date,  due  to  contractual  default,  the  amount  of  which  may  compromise  the  settlement  of  the  Company’s  monetary
obligations arising from the Issue, will result in the early maturity of these agreements.

Applicable to 21st issue:

Calculated every quarter upon the disclosure of interim or annual financial statements:

- Net debt/ EBITDA:  lower than or equal to 3.65;

- EBITDA/ paid financial expenses: equal to or higher than 1.5;

- Disposal of operating assets, extinguishment of license, loss of concession or loss of Issuer’s capacity to execute and operate the
basic sanitation public utilities in areas of the State of São Paulo territory, which considered individually or jointly during the
deed’s  effectiveness,  result  in  a  reduction  of  net  sales  revenue  and/or  services  revenue  of  the  Issuer  exceeding  twenty-five
percent (25%).  The limit established above will be calculated quarterly, taking into account the Issuer’s operating income for the
twelve (12) months preceding the end of each quarter and applying the financial information disclosed by the Issuer.

Non-compliance with the covenant clauses, during, at least, two consecutive quarters, or also two nonconsecutive quarters within
a twelve-month period shall result in the early maturity of the agreement.

The agreement have a cross acceleration clause, i.e., the early maturity of any of the Company’s debts, equal to or exceeding R$145
million,  adjusted  by  IPCA  variation  as  of  the  issue  date,  result  in  an  event  of  default  that  result  in  the  early  maturity  of  these
agreements.

(b)      Brazilian Federal Savings Bank - CEF 

(i)        Main events

Funding totaled R$144,654 in 2017, mainly related to the agreements in progress of the Growth Acceleration Program (PAC).

In 2017, amortization totaled R$65,836.

The  guarantee  for  financing  agreements  entered  into  with  the  Brazilian  Federal  Savings  Bank  is  the  recognition  of  a  portion  of
tariffs in an account for this purpose with the Brazilian Federal Savings Bank, which should maintain a flow equal to or at least
three times the amount of the monthly charges, during the grace period, based on interest, the management fee and the credit risk
rate  and,  during  the  amortization  phase,  based  on  the  principal,  interest,  the  management  fee  and  the  credit  risk  rate.
Additionally, the Company maintains a reserve account, linked to financing agreements, in the Brazilian Federal Savings Bank,
which  is  maintained  during  the  entire  term  the  agreements,  where  an  amount  is  accrued  equivalent  to  a  monthly  charge,
composed of, during the grace period, interest, the management fee and the credit risk rate and, during the amortization phase, of
the principal, interest, the management fee and the credit risk rate.

F-83

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(ii)    Covenants

The agreements have a cross default clause, i.e., the early maturity of any of the Company’s debts, due to contractual default, the
occurrence of which may anyhow compromise the settlement of its monetary obligations deriving from these contracts shall imply
the early maturity.

(c) BNDES

Balance  as  of  December  31,  2017  is  stated  net  of  borrowings  costs  in  the  amount  of  R$2,793  (R$3,517  on  December  31,  2016),
which will be amortized during the same maturity period of each contract.

(i)        Main events

In  2017,  funding  from  current  contracts  totaled  R$171,153,  mainly  referring  to  the  BNDES  2015  agreement,  in  the  amount  of
R$170,000.

In 2017, amortization totaled R$87,993.

Loans  are  collateralized  by  part  of  revenues  from  the  provision  of  water  and  sewage  services,  up  to  the  total  amount  of  the
outstanding balance.

(ii)      Covenants

The  agreements  entered  into  with  the  BNDES  have  standardized  financial  covenants,  as  described  in  item  (a),  (ii),  covenants
applicable to the 10th issue, 14th  issue and 18th  issue, of this Note.

(d)      Leasing

The Company has lease agreements signed as Assets Lease.  During the construction period, works are capitalized to intangible
assets in progress and the lease amount is recorded at the same proportion.  Works are estimated to be concluded in 2019.

After startup, the lease payment period starts (240 monthly installments), whose amount is periodically  restated  by  contracted
price index.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(e)      Eurobonds

Balance as of December 31, 2017 is net of borrowing costs in the amount of R$2,470 (R$3,290 as of December 31, 2016), which
will be amortized during the same maturity period of the contract.

(i)    Covenants

The contract has the following restrictive clauses “covenants”:

Calculated every quarter upon the disclosure of interim or annual financial statements:

Restrict the funding of new debts so that:

-   Adjusted total debt to EBITDA does not exceed 3.65;
-   The Company's debt service coverage ratio, determined at the end of each quarter, shall not be  lower than 2.35.

Noncompliance with covenants will accelerate the maturity of the agreement.

The agreement has a cross default clause, i.e., the early maturity of any indebtedness in view of the Company’s loans or any of its
Subsidiaries (*) with a total principal amount of US$ 25,000,000.00 or more (or its corresponding amount in other currencies)
shall imply this agreement’s early maturity.

(*)  As  per  agreement,  subsidiary  is:  “the  company,  partnership  or  another  entity  from  which  over  50%  of  its  voting  shares  are
directly or indirectly owned or controlled by any Person or one or other Person’s Subsidiaries, or their combination”.

(f)      Deutsche Bank US$150 million

 Balance as of December 31, 2017 is net of borrowing costs in the amount of R$5,757 (R$8,621 as of December 31, 2016), which
will be amortized during the maturity period of the contract.

(i)    Covenants

The agreement has the following restrictive clauses “covenants”:

Calculated every quarter upon the disclosure of interim or annual financial statements:

-   Total debt/adjusted EBITDA: lower than 3.65;
-   Company's debt service coverage ratio, determined at the end of each quarter, shall not be lower than 2.35.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Noncompliance with covenants for two quarters, consecutive or not, will accelerate the maturity of the agreement.

The agreement has a “cross acceleration” clause, i.e., in the early maturity of any debt of the Company or any of its subsidiaries,
with  a  total  principal  or  aggregate  amount  equal  to  or  higher  than  R$120  million  (or  its  equivalent  in  another  currency),
contracted pursuant to the Brazilian law, or with a total principal or aggregate amount equal to or higher than US$50 million (or
its equivalent in another currency), in the case of debts governed by the laws of any other jurisdiction other than Brazil, will result
in the early maturity of the agreement.

(*)  Pursuant  to  the  agreement,  a  subsidiary  means  any  partnership,  corporation,  company,  association  or  commercial  entity  in
which  SABESP  or  one  or  more  of  its  subsidiaries  directly  or  indirectly  hold  more  than  50%  of  the  outstanding  common  shares
with voting rights of its respective capital stock.

(g)      Inter-American Development Bank (BID)

Balance as of December 31, 2017 is net of borrowing costs amounting to R$14,517 (R$12,770 as of December 31, 2016), which will
be amortized during the same maturity period of the agreement.

(i)        Main events

In  2017,  funding  referring  to  BID  2202  agreement  totaled  R$  96,889  and  amortizations  in  the  amount  of  R$  189,280,  among
which, the settlement of the BID 713 agreement.

(ii)      Guarantees

Loans obtained from multilateral agencies and from Government Agencies, such as the BID, BIRD and JICA, are guaranteed by
the Federal Government, with a counter-guarantee of the São Paulo State government.

(iii)   Covenants

For the outstanding contracts, the Company has the following restrictive clauses “covenants”:

Calculated every quarter upon the disclosure of interim or annual financial statements:

-      Loan  agreement  1,212  -  Tariffs  must:  (a)  produce  revenues  sufficient  to  cover  the  system's  operating  expenses,  including
administrative, operating, maintenance, and depreciation expenses; (b) provide a return on property, plant, and equipment no
less than 7%; and (c) during project execution, the balances of current loans must not exceed 8.5% of total equity.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

This  agreement  have  an  early  maturity  clause,  i.e.,  in  the  early  maturity  will  occur  in  the  event  the  Company’s  fail  failure  to
comply with any obligation therewith or any agreements signed with the Bank related to Project finance.

(h)      Japan International Cooperation Agency - JICA

(i)        Relevant funding

Balance as of December 31, 2017 is stated net of borrowing costs amounting to R$3,100 (R$2,971 as of December 31, 2016), which
will be amortized during the same maturity period of the contract.

(ii)      Main events

In 2017, the Company raised R$63,909, referring to BZ-P19 (JICA 19) e BZ-P17 (JICA 17) agreements.

In 2017, amortizations totaled R$65,702 referring to JICA BZ-15 and JICA BZ-18 agreements.

For the guarantees assigned, see item g (ii) of this note.

(i)       AB Loan (IADB 1983AB)

The balance stated as of December 31, 2017 is net of borrowing costs amounting to R$3,400 (R$4,641 as of December 31, 2016),
which will be amortized during the same maturity period of the contract.

(i)        Main events

In 2017, amortization totaled R$75,610.

(ii)      Covenants

The Company has the following restrictive clauses “covenants”:

Calculated every quarter upon the disclosure of interim or annual financial statements:

- The Company’s ratio of debt service coverage, determined on a consolidated basis, must be higher than or equal to 2.35; and

- Total adjusted debt over adjusted EBITDA, determined on a consolidated basis, must be lower than 3.65.

The agreement has an early maturity clause, i.e., in the event of default, the BID may order the early maturity of the loan or part of
it.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

The agreement also has a “cross default” clause, i.e., in the event of default of any other Company debt with the BID or with third
parties (in this case, higher than US$25 million), the BID may order the early maturity of the loan.

(j)       International Bank for Reconstruction and Development - IBRD

Balance as of December 31, 2017 is stated net of borrowing costs amounting to R$310 (R$328 as of December 31, 2016), which
will be amortized during the same maturity period of the contract.

(i)        Main events

In 2017, funding totaled R$35,710.

For the guarantees assigned, see item g (ii) of this note.

(k)      Covenants

As of December 31, 2017 and 2016, the Company had met the requirements set forth by its borrowings and financing agreements.

(l) Exchange rate changes

In  2017,  the  US  dollar  appreciated  1.5%,  from  R$  3.2591  on  December  31,  2016  to  R$  3.3080  on  December  31,  2017,  reducing
debt  in  US  dollars  by  R$  58,718,  and  the  yen  appreciated  5.3%,  from  R$  0.02792  on  December  31,  2016  to  R$  0.02940  on
December 31, 2017, reducing debt in yen by R$ 85,211.

F-88

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(m)    Borrowings and financing – Credit Limited

Agent

Brazilian Federal Savings Bank

Brazilian Development Bank – BNDES

Inter-American Development Bank – BID

Japan International Cooperation Agency – JICA

Other

TOTAL

December 31, 2017

(in millions of reais (*))

1,487

1,576

436

244

38

3,781

(*) Brazilian Central Bank’s exchange rate as of December 30, 2017 (US$1.00 = R$3.3080;  ¥1.00 = R$0.02940).

SABESP in order to comply with its Capex plan relies on a fund-raising plan.

Financing resources contracted have specific purposes, which have been released for the execution of their respective investments,
according to the progress of the works.

17           Taxes recoverable/payable

(a)         Current assets

Recoverable taxes

Income tax and social contribution

Withholding income tax (IRRF) on financial investments

Other federal taxes

Other municipal taxes

Total

December 31, 2017

December 31, 2016

270,614

2,606

3,365

-

276,585

32,365

7,057

2,961

250

42,633

The increase in recoverable taxes is mainly due to the increase in the “income tax and social contribution” item, referring to the
estimates paid are higher that the amounts due in the year.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(b)         Current liabilities

Taxes and contributions payable

Cofins and Pasep

INSS (Social Security contribution)

IRRF (withholding income tax)

Other

Total

18           Deferred taxes and contributions

(a)         Statement of financial position details

Deferred income tax assets

Provisions

Actuarial gain/loss – G1 Plan

Pension obligations - G1

Donations of underlying asset on concession agreements

Credit losses

Other

Total deferred tax assets

Deferred income tax liabilities

Temporary difference on concession of intangible asset

Capitalization of borrowing costs

Profit on supply to governmental entities

Actuarial gain/loss – G1 Plan

Construction margin

Borrowing costs

Total deferred tax liabilities

December 31, 2017

December 31, 2016

74,034

35,365

58,204

16,362

183,965

49,132

35,376

62,771

21,478

168,757

December 31, 2017

December 31, 2016

482,863

-

165,503

55,112

199,063

151,562

1,054,103

(460,177)

(415,379)

(76,705)

(36,538)

(88,947)
(13,111)

524,129

85,044

167,922

57,317

266,757

151,247

1,252,416

(492,341)

(374,512)

(92,365)

-

(91,790)
(15,063)

(1,090,857)

(1,066,071)

Deferred tax assets (liabilities), net

(36,754)

186,345

F-90

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(b)      Realization

Deferred income tax assets

to be realized within 12 months

to be realized after one year

Total deferred tax assets

Deferred income tax liabilities

to be realized within 12 months

to be realized after one year

Total deferred tax liabilities

Deferred tax asset (liabilities)

(c)      Changes

Deferred income tax assets

Provisions

Actuarial gain/loss – G1

Pension obligations - G1
Donations of underlying asset on concession
agreements

Credit losses

Other

Total

Deferred income tax liabilities
Temporary difference on concession of intangible
asset

Capitalization of borrowing costs

Profit on supply to governmental entities

Actuarial gain/loss – G1

Construction margin

Borrowing costs

Total

December 31, 2017

December 31, 2016

221,999
832,104

1,054,103

(51,520)
(1,039,337)

(1,090,857)

(36,754)

December 31,
2016

524,129

85,044

167,922

57,317

266,757
151,247

1,252,416

(492,341)

(374,512)

(92,365)

-

(91,790)
(15,063)

(1,066,071)

Net
change

(41,266)

(85,044)

(2,419)

(2,205)

(67,694)
315

(198,313)

32,164

(40,867)

15,660

(36,538)

2,843
1,952

(24,786)

314,725
937,691

1,252,416

(143,428)
(922,643)

(1,066,071)

186,345

December 31,
2017

482,863

-

165,503

55,112

199,063
151,562

1,054,103

(460,177)

(415,379)

(76,705)

(36,538)

(88,947)
(13,111)

(1,090,857)

Deferred tax assets (liabilities), net

186,345

(223,099)

(36,754)

F-91

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Deferred income tax assets

Provisions

Pension obligations - G0

Pension obligations - G1

Donations of underlying asset on concession
agreements

Credit losses

Tax losses

Other

Total

Deferred income tax liabilities

Temporary difference on concession of intangible
asset

Capitalization of borrowing costs

Profit on supply to governmental entities

Actuarial gain/loss – G1

Construction margin

Borrowing costs

Total

Deferred tax asset, net

Opening balance

Net change in the year:

 - corresponding entry to the income statement
 - corresponding entry to valuation adjustments to equity (Note
20 (b))

Total net change

Closing balance

F-92

December 31,
2015

480,378

-

256,808

53,206

213,171

58,829

121,550

1,183,942

(524,495)

(309,648)

(81,055)

(33,726)

(94,921)

(11,855)

(1,055,700)

Net
change

43,751

85,044

(88,886)

4,111

53,586

(58,829)

29,697

68,474

32,154

(64,864)

(11,310)

33,726

3,131

(3,208)

(10,371)

December 31,
2016

524,129

85,044

167,922

57,317

266,757

-

151,247

1,252,416

(492,341)

(374,512)

(92,365)

-

(91,790)

(15,063)

(1,066,071)

128,242

58,103

186,345

December 31,
2017

December 31,
2016

December 31,
2015

186,345

128,242

209,478

(101,517)

(121,582)

(223,099)

(36,754)

(60,667)

118,770

58,103

186,345

(50,024)

(31,212)

(81,236)

128,242

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(d)      Reconciliation of the effective tax rate

The amounts recorded as income tax and social contribution expenses in the financial statements are reconciled to the statutory
rates, as shown below:

Profit before income taxes

Statutory rate

Estimated expense at statutory rate

Tax benefit of interest on equity

Permanent differences

     Provision – Law 4,819/58 (i)

     Donations

GESP Agreement (note 10 (vii))

     Other differences

December 31, 2017

December 31, 2016

December 31, 2015

3,503,614

34%

(1,191,229)

245,444

(57,104)

(12,413)

-

30,998

4,129,054

34%

(1,403,878)

245,637

(63,039)

(10,987)

-

50,311

587,529

34%

(199,760)

56,172

(54,679)

(3,153)

151,465

(1,295)

Income tax and social contribution

(984,304)

(1,181,956)

(51,250)

Current income tax and social contribution

Deferred income tax and social contribution

Effective rate

(882,787)

(101,517)

28%

(1,121,289)

(60,667)

29%

(1,226)

(50,024)

9%

(i)     Permanent difference related to the provision for actuarial liability (Note 20 (b) (iii)).

F-93

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

19           Provisions

    (a)   Lawsuits and proceedings that resulted in provisions

(I) Statement of financial position details

The Company is party to a number of claims and legal proceedings arising in the normal course of business, including civil, tax,
labor and environmental matters. Management recognizes provisions in the financial statements consistently with the recognition
and measurement criteria established in Note 3.15. The ultimate timing and amounts of the payments depends on the outcome of
the court cases. The provisions, net of escrow deposits are as follows:

Customer claims (i)

Supplier claims  (ii)

Other civil claims (iii)

Tax claims (iv)

Labor claims (v)

Environmental claims (vi)

Total

Current

Noncurrent

Provisions

Escrow
deposits

438,619

(56,301)

332,037

(259,608)

114,544

77,100

299,842

160,446

(16,227)

(5,507)

(6,741)

-

1,422,588

(344,384)

607,959

-

814,629

(344,384)

December 31,

2017  
382,318  
72,429  
98,317  
71,593  

293,101
160,446  
1,078,204  

607,959  
470,245  

Provisions

572,210

332,667

131,286

69,898

285,413

150,084

Escrow
deposits

December
31,
2016

(97,171)

475,039

(251,510)

(12,652)

(2,986)

(3,202)

(962)

81,157

118,634

66,912

282,211

149,122

1,541,558

(368,483)

1,173,075

730,334

-

811,224

(368,483)

730,334

442,741

F-94

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(II) Changes

Customer claims (i)

Supplier claims  (ii)

Other civil claims (iii)

Tax claims (iv)

Labor claims (v)

Environmental claims (vi)

Subtotal

Escrow deposits

Total

Customer claims (i)

Supplier claims  (ii)

Other civil claims (iii)

Tax claims (iv)

Labor claims (v)

Environmental claims (vi)

Subtotal

Escrow deposits

Total

December 31,
2016

Additional
provisions

Interest and
inflation
adjustment

572,210

332,667

131,286

69,898

285,413

150,084

1,541,558

(368,483)

1,173,075

December 31,
2015

561,061

296,660

124,833

62,812

283,991

83,520

1,412,877

(330,663)

1,082,214

26,642

23,017

13,517

6,877

55,106

32,377

157,536

(29,089)

128,447

Additional
provisions

109,540

12,885

20,638

20,716

51,408

68,485

283,672

(38,269)

245,403

Use of the
accrual

(138,466)

(39,433)

(19,975)

(259)

(43,498)

(24,585)

Amounts not
used
(reversal)

December 31,
2017

(66,572)

(21,102)

(22,341)

(6,808)

(36,040)

(13,586)

438,619

332,037

114,544

77,100

299,842

160,446

(266,216)

(166,449)

15,354

45,657

1,422,588

(344,384)

44,805

36,888

12,057

7,392

38,861

16,156

156,159

(7,823)

148,336

(250,862)

(120,792)

1,078,204

Interest and
inflation
adjustment

Use of the
accrual

Amounts not
used
(reversal)

December 31,
2016

95,459

43,679

19,940

14,265

29,419

23,508

226,270

(27,153)

(87,334)

(20,018)

(8,080)

(4,621)

(37,072)

-

(106,516)

(539)

(26,045)

(23,274)

(42,333)

(25,429)

572,210

332,667

131,286

69,898

285,413

150,084

(157,125)

(224,136)

9,601

18,001

1,541,558

(368,483)

199,117

(147,524)

(206,135)

1,173,075

F-95

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Customer claims (i)

Supplier claims  (ii)

Other civil claims (iii)

Tax claims (iv)

Labor claims (v)

Environmental claims (vi)

Subtotal

Escrow deposits

Total

December 31,
2014

Additional
provisions

Interest and
inflation
adjustment

Use of the
accrual

Amounts not
used
(reversal)

December 31,
2015

638,637

260,854

126,403

55,554

235,466

226,404

1,543,318

(322,971)

1,220,347

34,868

7,062

13,022

1,501

114,499

17,072

188,024

(16,892)

171,132

96,735

39,143

20,643

8,557

27,231

16,247

208,556

(21,791)

(92,203)

(116,976)

(5,837)

(12,778)

(266)

(23,431)

(8,081)

(4,562)

(22,457)

(2,534)

(69,774)

(168,122)

561,061

296,660

124,833

62,812

283,991

83,520

(142,596)

(384,425)

26,061

4,930

1,412,877

(330,663)

186,765

(116,535)

(379,495)

1,082,214

(b)      Lawsuits deemed as contingent liabilities

The Company is party to lawsuits and administrative proceedings relating to environmental, tax, civil and labor claims, which are
assessed as contingent liabilities in the financial statements, since it either does not expect outflows to be required or the amount
of the obligation cannot be reliably measured. Contingent liabilities are represented as follows:

Customer claims (i)

Supplier claims  (ii)

Other civil claims (iii)

Tax claims (iv)

Labor claims (v)

Environmental claims (vi)

Total

December 31, 2017

December 31, 2016

219,900

1,430,600

733,100

1,291,000

677,400

3,879,000

8,231,000

306,500

1,422,000

709,400

1,143,000

533,600

3,317,600

7,432,100

(c)      Explanation on the nature of main classes of lawsuits

(i)      Customer claims

Approximately 1,070 lawsuits (1,140 as of December 31, 2016) were filed by commercial customers, who claim that their tariffs
should  correspond  to  other  consumer  categories,  and  680  lawsuits  (710  as  of  December  31,  2016)  in  which  customers  claim  a
reduction in the sewage tariff due to losses in the system, consequently requesting the refund of amounts charged by the Company
and  50  lawsuits  (50  as  of  December  31,  2016)  in  which  customers  plead  the  reduction  in  tariff  under  the  category  as  “Social
Welfare Entity”. The Company was granted both favorable and unfavorable final decisions at several court levels. The R$ 92,721
decrease  in  accrued  lawsuits  was  mainly  due  to  payments  in  the  period,  while  the  R$  86,600  decrease  in  lawsuits  deemed  as
contingent liabilities is mainly related to revision of expectations arising from court decisions in the period.

F-96

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(ii)        Supplier claims

These lawsuits include lawsuits filed by some suppliers alleging underpayment of monetary restatements, withholding of amounts
related  to  the  understated  inflation  rates  deriving  from  Real  economic  plan,  and  the  economic  and  financial  imbalance  of  the
agreements, and are in progress at different courts.

(iii)      Other civil claims

These mainly refer to indemnities for property damage, pain and suffering, and loss of profits allegedly caused to third parties,
filed at different court levels.

(iv)       Tax claims

Tax  claims  refer  mainly  to  issues  related  to  tax  collections  and  fines  in  general  challenged  due  to  disagreements  regarding
notification or differences in the interpretation of legislation by the Company's management. The R$ 148,000 increase in lawsuits
deemed as contingent liabilities is mainly related to the new claims filed and update of lawsuits in progress.

(a) In 2006, the Brazilian Federal Revenue Service, by means of a tax execution, verified the Company’s compliance with the tax
obligations related to income tax and social contribution for calendar year 2001, and issued a tax assessment adjusted through
December 31, 2017 in the amount of R$ 52,192 (R$ 50,203 as of December 31, 2016).  The Company appealed this recognition
and was granted a partial relief in the first administrative instance. In December 2015, it filed a Voluntary Appeal against the part
of the decision that was unfavorable to it. Management considers that this administrative proceeding is deemed as a contingent
liability.

(b) The municipality of São Paulo, through law, revoked the services tax exemption which until them the company withheld and
thereafter issued tax deficiency notices related to the sewage service and ancillary activities, in the updated amount of R$ 547,510
(R$ 501,060 as of December 31, 2016), which currently are subject-matter of Tax Foreclosures, deemed by the Management as
contingent  liabilities.  SABESP  filed  a  writ  of  mandamus  against  this  revocation,  which  was  rejected.  Writs  of  prevention  and
actions  for  annulment  were  also  filed,  aiming  the  suspension  of  enforceability  of  credits  and  the  annulment  of  tax  deficiency
notices,  as  it  understands  that  notwithstanding  the  exemption  revocation,  the  sewage  activities  and  ancillary  activities  are  not
included  in  the  list  of  activities  subject  to  taxation  by  municipality.  The  appellate  decision  was  favorable  to  the  Company.  The
Municipality’s  special  and  extraordinary  appeal  is  still  pending.  The  Company’s  Management  deemed  the  proceeding  as
contingent liability.

F-97

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(c)  The  Federal  Revenue  Service  rejected  some  offset  requests  made  by  the  Company  for  the  extinction  of  IRPJ/CSLL  payable,
using favorable amounts, arising from undue payments of IRPJ/CSLL, which were paid based on monthly estimates. The amount
involved  was  adjusted  through  December  31,  2017  and  is  R$  42,173  (R$  62,039  as  of  December  31,  2016).    Management
considered this administrative proceeding as a contingent liability.

(d) The Company’s request for an authorization to offset taxes was rejected, overdue in the periods of July, August and September
2002 against the amount of IRPJ paid in excess in 1997 and 1998, due to inflation adjustment over the financial statements (Law
8,200/91), which was anticipated in 1996 due to an injunction, after excluded due discontinuance of proceeding and application
of Provisional Measure 38/02. The Administrative Council of Tax Appeals rejected the credit from 1997. The amount involved was
adjusted through December 31, 2017 and is estimated at R$ 51,374 (R$ 49,682 as of December 31, 2016). Management considered
this administrative proceeding as a contingent liability.

(e) Some municipalities have filed several lawsuits against SABESP related to taxes and fines in general, which were accrued and
deemed as contingent liabilities. As of December 31, 2017, the restated amounts of such lawsuits were R$ 40,123 (R$ 39,495 as of
December 31, 2016) and R$ 582,168 (R$ 466,407 as of December 31, 2016), respectively.

(f) In 2005, the Brazilian Federal Revenue Service partially rejected the Company´s request of offsetting tax credits related to the
Corporate Income Tax (IRPJ) and the Social Contribution on Net Income (CSLL) in the amount of approximately R$ 56,118, and
R$ 8,659, respectively, which relate to the period from January to April 2003, for which the Company offset prior year IRPJ and
CSLL  negative  balances.  The  amounts  not  ratified  by  the  authority  of  IRPJ  and  CSLL  are  R$  11,164  and  R$  698,  totaling  R$
11,862  million.  As  the  company  was  granted  a  partial  relief  in  this  matter,  it  considered  the  restated  amount  of  R$  8,296  as  of
December 31, 2017 (R$ 8,010 as of December 31, 2017) as a contingent liability and accrued R$ 1,415 (R$ 1,366 as of December
31, 2016) pursuant to item 3.15.

(g) SABESP filed two writs of mandamus pleading the declaration of unconstitutional municipal laws that levy the collection of
taxes deriving from the use of public areas in the water and  sewage  network  installation for  the rendering of basic sanitation
public utilities.  The first writ of mandamus was judged groundless at the lower court and the Court of Justice of São Paulo, in the
appeal's  records,  partially  granted  relief  to  recognize  the  impossibility  of  charging  the  monthly  contribution,  due  to
unconstitutionality,  deeming  as  valid  the  need  of  security  and  other  requirements  to  issue  the  Statement  of  Use  Permit–  TPU,
however, this decision had no effect since the rules, subject-matter of the first writ of mandamus were revoked.  The second writ
of mandamus was granted partial relief to prohibit the enforceability of public price and the security for the use of public areas
deriving from the municipal laws.  The municipality’s appeal, which was filed as special and extraordinary appeals, was rejected
and  is  pending  judgment.  At  the  same  time,  the  São  Paulo  State  Appellate  Court  suspended  the  lawsuit  until  a  final
pronouncement regarding Federal Supreme Court’s general repercussion matter no. 261 on the Fee – Occupation – Light Pole –
Electricity.  Management  considered  it  as  a  contingent  liability,  but  was  not  able  to  estimate  the  amount  involved,  given  the
specificities of the lawsuit.  

F-98

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(v)          Labor claims

The Company is a party to labor lawsuits, involving issues such as overtime, shift schedule, health hazard premium and hazardous
duty premium, prior notice, change of function, salary equalization, service outsourcing and other. Part of the amount involved is
in provisional or final execution at various court levels. The R$ 143,800 increase in lawsuits deemed as contingent liabilities is
mainly due to the new lawsuits filed and updates on lawsuits in progress.

(vi)       Environmental claims

These refer to several administrative proceedings and lawsuits filed by government entities, including Companhia de Tecnologia
de Saneamento Ambiental – Cetesb and the Public Prosecution Office of the State of São Paulo, that aim affirmative and negative
covenants  and  penalty  is  estimated  due  to  failure  to  comply  in  addition  to  the  imposition  of  indemnity  due  to  environmental
damages  allegedly  caused  by  the  Company.  The  amounts  accrued  represent  the  best  estimate  of  the  Company  at  this  moment,
however, may differ from the amount to be disbursed as indemnity to alleged damages, in view of the current stage of referred
proceedings.  The  R$  561,400  increase  in  lawsuits  deemed  as  contingent  liabilities  is  mainly  due  to  the  new  lawsuits  filed  and
updates on lawsuits in progress.

Among  the  main  lawsuits  the  Company  is  involved,  there  are  public  civil  actions  the  subject-matters  of  which  are:  a)  sentence
SABESP  to  restrain  itself  from  discharging  or  releasing  sewage  without  due  treatment;  b)  invest  in  the  water  and  sewage
treatment system of the municipality, under the penalty of paying a fine; c) payment of indemnity due to environmental damages,
amongst others.

(d)      Other concession-related legal proceedings      

The  Company  is  party  in  concessions-related  proceedings,  where  it  challenges  damage-related  issues  to  recover  the  right  of
operating water supply and sewage collection services in few municipalities or the right to continue operating said services.

The  amount  of  intangible  assets  related  to  the  municipalities  mentioned  in  the  lawsuits  mentioned  below  (except  for  item  “h”)
totaled R$ 28,417 as of December 31, 2017 (R$ 28,273 as of December 31, 2016), of which R$ 24,071 (items “c” to “g”) reclassified
to indemnities receivable in noncurrent assets, and estimated losses in the full amount of the claim were recorded (see Note 14
(b)).  All  municipalities  mentioned  below  are  not  operated  by  the  Company.  When  a  municipality  is  awarded  a  final  an
unappealable  favorable  sentence,  allowing  it  to  repossess  sanitation  service  assets  and  operations,  the  Brazilian  legislation
provides for the indemnity of the Company’s investments.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(a) Cajobi filed an action to recover possession against SABESP, which was granted relief to maintain the municipality in the
possession  of  water  and  sewage  assets;  the  likelihood  of  the  Company  resuming  operations  is  remote.  As  of  February  18,
2018, the appeal filed in the Appellate Court was denied. Meanwhile, SABESP has filed a motion against the municipality of
Cajobi aiming at the enumeration and appraisal of the concession assets, which is in the forensic accounting stage and will
support the subsequent filing of an action for damages;

(b) Macatuba filed an action to recover possession against SABESP, which was granted relief; the likelihood of the Company
resuming  operations  is  remote.  Meanwhile,  SABESP  has  filed  an  appeal  requesting  the  payment  by  the  municipality  of
indemnity related to non-amortized reversible assets.  The action is in the forensic accounting stage.  In this same action, the
municipality  of  Macatuba  counterclaimed  because  it  believes  that  SABESP  earned,  through  the  collection  of  tariffs,  more
than the amount invested in the water and sewage system, requesting that the Company be sentenced to pay an indemnity to
be calculated by forensic experts, which is deemed as a contingent liability;

(c) The Company filed a repossession action against the municipality of Álvares Florence, which was deemed groundless in
an  unappealable  judgment.  SABESP  also  filed  an  action  for  damages,  requiring  the  payment  related  to  non-amortized
reversible  assets.  The  Court  sentenced  the  municipality  to  comply  with  the  terms  of  the  agreement.  The  municipality  then
filed motion and the appeal is pending judgment;

(d)  Embaúba  was  granted  relief  after  filling  a  repossession  action  against  SABESP  to  maintain  the  municipality  in  the
possession of water and sewage assets and was issued a final and unappealable judgment.  The indemnity action was judged
groundless in first instance and upheld by the Court of Justice. SABESP filed a motion that is still pending judgment;

(e) Araçoiaba da Serra filed a repossession action against SABESP, which was granted relief to maintain the municipality in
the possession of water and sewage assets and was issued a final and unappealable judgment.  SABESP filed an indemnity
action, which is in progress, in the forensic expert stage;

F-100

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Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(f)  Itapira  filed  a  repossession  action  against  SABESP,  which  was  granted  relief  to  maintain  the  municipality  in  the
possession of water and sewage assets, which was issued final and unappealable decision.  SABESP filed an indemnity action,
which is pending judgment;

(g)  Tuiuti,  through  an  action,  obtained  the  right  to  continue  operating  water  and  sewage  services.  However,  in  a  counter-
claim, the municipality was sentenced to pay an indemnity, as a final decision that became an execution object by SABESP.
As of December 7, 2016, an official communication was issued requesting the payment of the award;

(h) Mauá is a defendant in a lawsuit filed by SABESP in 1996, in order to receive indemnification for its investments during
the  period  of  the  concession  agreement.  The  court  found  for  the  plaintiff  and  the  decision  was  executed.  The  lawsuit  is
currently  pending  payment  through  registered  warranties.  The  assets  object  of  indemnification  total  R$  85,918;  estimated
losses in the full amount were recorded.

(e)      Environmental lawsuits with settlements made in 2017

In 2017, the Company entered into several legal and administrative agreements totaling R$ 41,133. Of this amount, R$ 19,077 is
related to the construction and R$ 22,056 to environmental indemnifications, recorded under “other liabilities”. The accumulated
balance  as  of  December  31,  2017,  corresponding  to  environmental  indemnifications,  totaled  R$  43,014  (R$  20,626  as  of
December 31, 2016).

F-101

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(f) Guarantee insurance for escrow deposit

The Company contracts guarantee insurance for escrow deposit, which was renewed as of May 25, 2017, in the amount of R$ 500
million.  Such  insurance  will  be  used  to  settle  legal  claims  instead  of  have  immediate  cash  disbursement  by  the  Company,  such
insurance is used until the conclusion of these proceedings limited to up to five years.

In 2017, the Company used R$ 101,192 of the total contracted amount (R$ 134,377 in 2016).

20          Employees benefits

(a)      Health benefit plan

The health benefit plan is managed by Sabesprev and consists of optional, free choice, health plans sponsored by contributions of
SABESP and the active participants, as follows:

.     Company: 7.7% (December 31, 2016 – 7.3%) on average, of gross payroll;

.     Participating employees: 3.21% of base salary and premiums, equivalent to 2.8% of payroll, on average.

(b)      Pension plan benefits

Funded plan – G1 (i)

Present value of defined benefit obligations

Fair value of the plan assets

December 31,
2017

December 31,
2016

2,319,841

(1,931,380)

2,465,721

(1,712,551)

Net liabilities recognized for defined benefit obligations

388,461

753,170

Unfunded plan – G0 (iii)

Present value of defined benefit obligations

2,543,877

2,512,080

Net liabilities recognized for defined benefit obligations

2,543,877

2,512,080

Liability as per statement of financial position – pension obligations (*)

2,932,338

3,265,250

F-102

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

In  spite  of  the  decrease  in  interest  rate  in  the  year,  the  decrease  of  actuarial  liability  was  mainly  due  to  the  commencement  of
payments by the Company and Participants as well as reduction of benefits to Retired Beneficiaries in 2017 to reduce the deficit.

Pursuant to IAS19, the Company recognizes (gains)/losses, due to changes in assumptions under equity, as valuation adjustments
to equity, as shown below:

As of December 31, 2017

Actuarial gains/(losses) on obligations

Gains/(losses) on financial assets

Total gains/(losses)

Deferred income tax and social contribution - G1 Plan

Valuation adjustments to equity

As of December 31, 2016

Actuarial gains/(losses) on obligations

Gains/(losses) on financial assets

Total gains/(losses)

Deferred income tax and social contribution - G1 Plan

Valuation adjustments to equity

As of December 31, 2015

Actuarial gains/(losses) on obligations

Gains/(losses) on financial assets

Total gains/(losses)

Deferred income tax and social contribution - G1 Plan

Valuation adjustments to equity

G1 Plan

G0 Plan

Total

305,511

52,083

357,594

(121,582)

236,012

51,535

-

51,535

-

51,535

357,046

52,083

409,129

(121,582)

287,547

G1 Plan

G0 Plan

Total

(541,783)

192,458

(349,325)

118,770

(230,555)

(241,711)

-

(241,711)

-

(241,711)

(783,494)

192,458

(591,036)

118,770

(472,266)

G1 Plan

G0 Plan

Total

228,191

(136,389)

91,802

(31,212)

60,590

(24,224)

-

(24,224)

-

(24,224)

203,967

(136,389)

67,578

(31,212)

36,366

F-103

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(i)          G1 Plan

The  Company  sponsors  a  defined  benefit  pension  plan  for  its  employees  ("G1  Plan"),  which  is  managed  by  Sabesprev,  receives
similar contributions established in a plan of subsidy of actuarial study of Sabesprev, as follows:

·    0.99% of the portion of the salary of participation up to 20 salaries; and
·    8.39% of the surplus, if any, of the portion of the salary of participation over 20 salaries.

As of December 31, 2017, SABESP had a net actuarial liability of R$388,461 (R$753,170 as of December 31, 2016) representing the
difference  between  the  present  value  of  the  Company's  defined  benefit  obligations  to  the  participating  employees,  retired
employees, and pensioners; the fair value of the plan’s assets.

Defined benefit obligation, beginning of the year

Current service cost

Interest cost

Actuarial (gains)/losses recorded as other comprehensive income

Effect of the plan migration – early reduction/curtailment

Benefits paid

2017

2,465,721

17,582

260,409

(305,511)

-

(118,360)

2016

2,252,204

35,845

285,227

541,783

(525,992)

(123,346)

Defined benefit obligation, end of the year

2,319,841

2,465,721

Below, the change of fair value of the plan during the year:

Fair value of the plan’s assets, beginning of the year

Expected return on the plan assets

Expected Company’s contributions

Expected participants’ contributions

Benefits paid

Actuarial gains/(losses) recorded as other comprehensive income

Effect of the plan migration – early reduction/curtailment

Fair value of the plan’s assets, end of the year

2017

1,712,551

183,689

48,742

52,675

(118,360)

52,083

-

1,931,380

2016

1,586,930

201,779

23,046

23,525

(123,347)

192,458

(191,840)

1,712,551

(Deficit)/Surplus

(388,461)

(753,170)

F-104

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

The amounts recognized in the year are as follows:

Current service expenses

Interest cost rate

Expected return on the plan assets

Total expenses

2017

(35,093)

260,409

2016

13,562

285,227

2015

23,303

287,334

(183,689)

(201,778)

(205,981)

41,627

97,011

104,656

In  2017,  the  expenses  related  to  defined  pension  plan  amounting  to  R$35,156,  R$1,864  and  R$619  (R$60,263,  R$7,982  and
R$24,557 in 2016 and R$68,412, R$8,838 and R$22,902 in 2015), were recorded in operating costs, selling and administrative
expenses, respectively.  The amount of R$3,988 was capitalized in assets (R$4,209 in 2016 and R$4,504 in 2015).

Estimated expenses

Service cost

Interest cost rates

Participants contribution

Net profitability on financial assets

Expense to be recognized by the employer

Actuarial assumptions:

Discount rate – actual rate (NTN-B)

Inflation rate

Expected rate of return on assets

Future salary increase

Mortality table

2018

15,228

213,201

(37,659)

(179,449)

11,321

2017

2016

2015

5.35% p.a.

3.96% p.a.

5.74% p.a.

4.87% p.a.

7.23% p.a.

6.49% p.a.

9.52% p.a.

10.89% p.a.

14.19% p.a.

6.04% p.a.

6.97% p.a.

8.62% p.a.

AT-2000

AT-2000

AT-2000

The number of active participants as of December 31, 2017 was 4,317 (4,547 as of December 31, 2016), and of inactive participants
was 6,978 (6,896 as of December 31, 2016).

F-105

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

The benefit to be paid of G1 pension plan, expected for 2018 is R$165,307.

The  contributions  of  the  Company  and  participants  of  Plan  G1  in  2017  were  R$  48,742  (R$  24,288  in  2016)  and  R$  52,047
(R$  21,895  in  2016),  respectively.  Of  this  amount,  the  Company  and  the  participants’  payments  corresponding  to  the  actuarial
deficit of the G1 funded plan in 2017, totaled R$ 35,931 and R$ 38,668, respectively.

    Sensitivity analysis of the defined benefit pension plan as of December 31, 2017 regarding the changes in the

main assumptions are:

Plan – G1

Discount rate

Wage increase rate

Life expectation

Plan’s assets

Change in assumption

Impact on present value of the defined
benefit obligations

Increase of 1.0%

Decrease of 1.0%

Increase of 1.0%

Decrease of 1.0%

Increase of 1 year

Decrease of 1 year

Decrease of R$257,172

Increase of R$309,440

Increase of R$33,484

Decrease of R$29,143

Increase of R$40,729

Decrease of R$41,838

The plan investment policies and strategies are aim at getting consistent returns and reduce the risks associated to the utilization
of financial assets available on the Capital Markets through diversification, considering factors, such as the liquidity needs and the
long-term nature of the plan liability, types and availability of financial instruments in the local and international markets, general
economic conditions and forecasts as well as requirements under the law.  The plan's asset allocation management strategies are
determined with the support of reports and analysis prepared by Sabesprev and independent financial advisors:

December 31, 2017

December 31, 2016

Fixed income

     -  NTNBs

     -  NTNCs

     -  NTNFs

Government bonds in own portfolio

Fixed income fund quotas

Private credit investment fund quotas

Debentures

Total fixed income

Equities

Stocks investment fund quotas

Shares

Total equities

Structured investments

Equity investment fund quotas

Real estate investment fund quotas

Multimarket investment fund quotas

Total structured investments

(a)

(b)

(c)

(d)

(e)

(f)

(g)

1,064,935

146,495

-

1,211,430

260,352

135,454

3,902

1,611,138

195,459

3,903

199,362

86,193

27,170

-

113,363

997,027

141,405

5,803

1,144,235

95,854

139,665

3,940

1,383,694

180,721

15,467

196,188

76,680

18,428

31,195

126,303

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(h)

7,517

6,366

Fair value of the plan assets

1,931,380

1,712,551

F-106

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(a)  Fixed  income:  it  is  composed  of  government  bonds  issued  by  the  National  Treasury,  between  2024  and  2055.  These
instruments  are  indexed  by  NTN-b  indexed  by  IPCA  (Extended  Consumer  Price  Index)  and  NTN-c  indexed  by  IGPM  (General
Market Price Index).

(b) Fixed Income Fund Quotas: investment funds that seek return on fixed income assets and shall have   at least, 80% of

the portfolio in directly related assets, summed up via derivatives to the risk factor.

(c) Private Credit Investment Fund Quotas: funds that seek return by means of the acquisition of operations representing
corporate debts or disseminated receivables portfolios (rights or   bonds), originated and sold by several assignors who anticipate
funds and have receivables from several business activities as guarantee.

(d)       Equities: equity fund composed of Brazilian companies’ stocks listed at B3.

(e) Equity Investment Fund Quotas: it is composed of a closed-ended investment fund.  The assets under its management
are destined to the acquisition of stocks, debentures, warrants or other securities convertible or swappable into shares issued by
companies trading in stock exchanges or not.

F-107

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(f)  Real Estate Investment Fund Quotas: Funds investing in real estate projects (commercial buildings, shopping centers,

hospitals, etc.).  The return on capital invested occurs by sharing the Fund’s proceeds or sale of its quotas in the Fund.

(g) Multimarket  Investment  Fund  Quotas:  Investment funds that use several investment strategies available in the capital

markets in order to obtain return higher than the CDI.

(h) Other: Investment fund quotas in global companies’ stocks, mostly US companies, borrowings, real estate, etc., reducing

operational and contingent liabilities.

Restrictions with respect to asset portfolio investments, in the case of federal government securities:

i) papers securitized by the National Treasury will not be permitted;
ii) derivative instruments must be used for hedge.

Restrictions with respect to asset portfolio investments, in the case of variable-income securities for internal management, are as
follows:

i) day-trade operations will not be permitted;
ii) sale of uncovered share is prohibited;
iii) swap operations without guarantee are  prohibited
iv) leverage will not be permitted, i.e., operations with derivatives representing leverage of  asset or selling  short, such operations
cannot result in losses higher than   invested amounts.

As of December 31, 2017, Sabesprev had in its investment portfolio debentures issued by the Company in the amount of R$ 3,899
(R$ 3,937 as of December 31, 2016). The real estate held in the portfolio is not used by the Company.

The assets’ consolidated profitability came to 12.02% in 2017, exceeding its actuarial target of 7.68%. in 2016, profitability came to
15.99%, exceeding the actuarial target of 12.44%.

Concerning  Fixed  Income,  the  strategies  focused  on  government  bonds  prevailed.  Said  bonds  appreciated  given  the  above-
mentioned expectation of approval of structural reforms.

Concerning  Equities,  following  the  same  dynamics,  shares  of  Brazilian  companies  traded  on  the  B3  appreciated,  anticipating
expected profit growth arising from a possible economic recovery. In 2017, the return of main Brazilian stock index, the Ibovespa,
recorded 26.86%, against 38.94% in 2016.

Structured Investments depreciated slightly due to investments in Private Equity Funds, which require initial investments before
generating the expected returns from the sale of the investees after development and appreciation.

F-108

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(ii)        Private pension plan benefits – Defined contribution

As of December 31, 2017, Sabesprev Mais plan, based on defined contribution, had 9,328 active and assisted participants (9,453
as of December 31, 2016).

With  respect  to  the  Sabesprev  Mais  plan,  the  contributions  from  the  sponsor  represent  100%  over  the  total  basic  contribution
from  the  participants.    In  2017,  expenses  related  to  the  obligation  of  defined  contribution,  totaling  R$12,034,  R$1,744  and
R$3,245, were allocated to operating costs, selling expenses and administrative expenses.  The amount of R$2,197 was capitalized
in assets. In August 2016, the Company concluded the migration process initiated in 2010 and paid R$30,891, corresponding to a
non-recurring  contribution  and  incentive  to  participants  who  migrated,  and  R$7,214,  corresponding  to  the  previous  balance,
related to the migration that began in 2010.

The Company has made contributions in the amount of R$19,220 in 2017 (R$10,750 as of December 31, 2016).

(iii)    G0 Plan

Pursuant to Law 4,819/58, employees who started providing services prior to May 1974 and were retired as an employee of the
Company acquired a legal right to receive supplemental pension payments, which rights are referred as "Plan G0". The Company
pays  these  supplemental  benefits  on  behalf  of  the  State  Government  and  makes  claims  for  reimbursements  from  the  State
Government, which are recorded as accounts receivable from related parties, limited to the amounts that will be reimbursed by
the State Government. As of December 31, 2017, the Company recorded a defined benefit obligation for Plan G0 of R$2,543,877
(R$2,512,080 as of December 31, 2016).

Defined benefit obligation, beginning of the year

Current interest expense and service costs

Actuarial (gains)/losses recorded as other comprehensive income

Benefits paid

2017

2,512,080

262,873

(51,535)

(179,541)

2016

2,166,942

282,117

241,711

(178,690)

Defined benefit obligation, end of the year

2,543,877

2,512,080

The amounts recognized in the income statement are as follows:

F-109

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Current interest expense and service costs

Amount received from GESP (undisputed amount)

Total expenses

2017

2016

2015

262,873

(95,191)

282,117

248,054

(96,709)

(87,232)

167,682

185,408

160,822

In 2017 and 2016, the expenses related to the defined benefit obligation under Plan G0 were recorded in administrative expenses.

Estimated expenses

Interest cost rate

Expense to be recognized

The main actuarial assumptions used:

Discount rate – actual rate (NTN-B)

Inflation rate

Future salary increase

Mortality table

2018

232,248

232,248

2017

2016

2015

5.30% p.a.

5.71% p.a.

7.25% p.a.

3.96% p.a.

4.87% p.a.

6.49% p.a.

6.04% p.a.

6.97% p.a.

8.62% p.a.

AT-2000

AT-2000

AT-2000

The  number  of  active  participants  of  Plan  -  Go  as  of  December  31,  2017  was  10  (13  as  of  December  31,  2016).  The  number  of
beneficiaries, retirees and survivors as of December 31, 2017 was 2,294 (2,200 as of December 31, 2016).

The benefit payable from the Go pension plan expected for 2018 is R$186,991

The  sensitivity  analysis  of  defined  benefit  pension  plan  as  of  December  31,  2017  to  the  changes  in  the  main
assumptions is:

Plan – G0

Discount rate

Wages growth rate

Life expectation

Changes in assumption

Impact on present value of the defined
benefit obligations

Increase of 1.0%

Decrease of 1.0%

Increase of 1.0%

Decrease of 1.0%

Increase of 1 year

Decrease of 1 year

F-110

Decrease of R$227,083

Increase of R$267,435

Increase of R$273,937

Decrease of R$235,976

Increase of R$73,736

Decrease of R$74,033

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(c)      Profit sharing

The Company has a profit sharing program in accordance with an agreement with labor union and SABESP. The period covered
represents the Company fiscal year, commence in January to December. The limit of the profit sharing is one month salary for
each employee, depending on performance goals reached.  As of December 31, 2017, the Program’s balance payable was recorded
under “salaries, payroll charges and social contributions” in the amount of R$94,352 (R$83,687 as at December 31, 2016).

21           Services payable

The  services  account  records  the  balances  payable,  mainly  from  services  received  from  third  parties,  such  as  supply  of  electric
power, reading of hydrometers and delivery of water and sewage bills, cleaning, surveillance and security services, collection, legal
counsel services, audit, marketing and advertising and consulting services, among others.  This account also includes the amounts
payable to the Municipal Fund of Environmental Sanitation and Infrastructure based on a percentage of the revenues from São
Paulo  local  government  (Note  14  (c)  (v)).    The  balances  as  of  December  31,  2017  and  2016  were  R$  408,275  and  R$  460,054,
respectively.

22           Equity

(a)         Authorized capital

The Company is authorized to increase capital by up to R$15,000,000 (R$15,000,000 as of December 31, 2016), based on a Board
of Directors' resolution, after submission to the Fiscal Council.

In the event of capital increase, issue of convertible debentures and/or warrants by means of private subscription, shareholders
will have preemptive right in the proportion of number of shares held, pursuant to Article 171 of Law 6,404/76.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(b)         Subscribed and paid-in capital

Subscribed  and  paid-in  capital  is  represented  by  683,509,869  registered,  book-entry  common  shares  without  par  value  as  of
December 31, 2016 and 2015, held as follows:

December 31, 2017

December 31, 2016

State Department of Finance

Companhia Brasileira de Liquidação e Custódia (**)

The Bank of New York ADR Department   (equivalent in shares)
(*) (**)

Other

(*)       each ADR corresponds to 1 share.
(**)     custodians

(c)          Distribution of earnings

Number of
shares

343,524,285

201,026,895

%  Number of shares

% 

50,26%

29,41%

343,524,285

206,955,305

136,790,413

20,01%

132,401,813

2,168,276

0,32%

628,466

50,26%

30,28%

19,37%

0,09%

683,509,869

100,00%

683,509,869

100,00%

Shareholders are entitled to a minimum mandatory dividend of 25% of the adjusted net income under Brazilian GAAP, calculated
according to the Brazilian corporate law.  The dividends do not bear interest and the amounts not claimed within three years from
the date of the Shareholders' Meeting that approved them mature in favor of the Company.

Profit for the year

(-) Legal reserve - 5%

2017

2016

2,519,310

2,947,098

125,965

147,355

2015

536,279

26,814

2,393,345

2,799,743

509,465

Minimum  mandatory  dividend  –  25%  (R$0.87539,  R$1.0240  and  R$0.1863  as  of  December  31,
2017, 2016 and 2015 per share and per ADS)

598,336

699,936

127,366

On April 28, 2017, the Shareholders’ General Meeting approved the distribution of dividends as interest on capital amounting to
R$ 123,557, for the 2016 fiscal year. Therefore, the amount of R$ 62,719 related to the surplus minimum mandatory dividends of
25%,  set  forth  in  the  Bylaws,  recorded  in  the  2016  equity  under  “Additional  proposed  dividends”  was  transferred  to  current
liabilities.  These amounts started being paid in June 2017.

F-112

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

The  Company  proposed  dividends  as  interest  on  capital  in  the  amount  of  R$  598,336  (R$  699,936  in  2016)  and  additional
proposed dividends in the amount of R$ 105,543 (R$ 123,557 in 2016), totaling R$ 703,879 (R$ 823,493 in 2016), corresponding
to R$ 1.0298 per common share (R$ 1.2048 in 2016), to be resolved on the Shareholders’ Meeting to be held on April 27, 2018.

The  Company  declared  dividends  payable  as  interest  on  capital  in  the  amount  of  R$  598,336  (R$  699,936  in  2016),  which
considers the minimum dividend amount set forth in the Bylaws.  The amount exceeding the minimum mandatory dividend due
in the year of R$ 105,543 (R$ 123,557 in 2016) was reclassified into equity to the “Additional proposed dividends” account, this
amount includes the withholding income tax of R$52,004 (R$60,838 in 2016).

Pursuant  to  CVM  Resolution  207/1996,  the  Company  imputed  interest  on  capital  to  the  minimum  dividend  by  its  net  value  of
withholding income tax. The amount of R$ 52,004 (R$ 60,838 in 2016) referring to the withholding income tax was recognized in
current liabilities, in order to comply with tax liabilities related to the credit of interest on capital.

The interest on capital balance payable as of December 31, 2017, totaling R$ 598,612 (R$ 700,034 in 2016), refers to the amount
of  R$  598,336  (R$  699,936  in  2016)  declared  in  2017,  net  of  withholding  income  tax  and  R$  276  declared  in  previous  years
(R$ 98 in 2016).

(d)         Legal reserve

Earnings reserve - legal reserve is a requirement for all Brazilian corporations and represents an allocation of retained earnings of
5% of annual net income determined based on Brazilian law, up to 20% of capital.  However, we are not required to make any
allocations  to  our  legal  reserve  in  a  year  in  which  the  legal  reserve,  when  added  to  our  other  established  capital  and  earnings
reserves, exceeds 30% of our capital stock.  The amounts allocated to such reserve may only be used to increase our capital stock
or to offset losses and are not available for the payment of dividends.

(e)          Investments reserve

Earnings reserve - investments reserve is specifically formed by the portion corresponding to own funds assigned to the expansion
of the water supply and sewage treatment systems, based on capital budget approved by the Management.

As of December 31, 2017 and 2016, the balance of investment reserve totaled R$6,939,296 and R$5,249,830, respectively.

Pursuant to paragraph four of article 28 of the by-laws, the Board of Directors may propose to the Shareholders’ Meeting that the
remaining balance of profit for the year, after deducting the legal reserve and minimum mandatory dividends, be allocated to an
investment reserve that will comply with the following criteria:

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

I-   its balance, jointly with the balance of the other earnings reserves, except for reserves for contingencies and realizable

profits, may not exceed the   capital stock;

II- the reserve is intended to guarantee the investment plan and its balance may be used:

a) to absorb losses, whenever necessary;
b)  to distribute dividends, at any moment;
c)   in share redemption, reimbursement or purchase transactions authorized by    law;
d)  in incorporation to the capital stock.

(f) Allocation of profit for the year

Profit

(+)

(-)

(-)

(-)

Profit for the year

Legal reserve – 5%

Minimum mandatory dividends

Additional proposed dividends

Investment reserve recorded

2017

2016

2015

2,519,310

125,965

598,336

105,543

1.689.466

2,947,098

147,355

699,936

123,557

1.976.250

536,279

26,814

127,366

22,527

359.572

The Management will send for approval at the Shareholders’ Meeting, a proposal to reallocate retained earnings the amount of
R$1,689,466 to the Investment Reserve account, in order to meet the investment needs foreseen in the Capital Budget.

(g)      Retained earnings

Retained earnings (accumulated losses): the statutory balance of this account is zero as all retained earnings must be distributed
or allocated to an earnings reserve.

(h)      Other comprehensive loss

Gains  and  losses  arising  from  changes  in  the  actuarial  assumptions  are  accounted  for  as  equity  valuation  adjustments,  net  of
income tax and social contribution effects.  See Note 20 (b), the breakdown of amounts recorded in 2017 and 2016.

G1

G0

Total

Balance as of December 31, 2016

Actuarial gains/(losses) for the year (Note 20 (b))

Balance as of December 31, 2017

(165,085)

236,012

70,927

(660,563)

51,535

(609,028)

(825,648)

287,547

(538,101)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

23           Earnings per share

Basic and diluted

Basic earnings per share is calculated by dividing the equity attributable to Company’s owners by the weighted average number of
outstanding  common  shares  during  the  year.    The  Company  does  not  have  potentially  dilutive  common  shares  outstanding  or
debts convertible into common shares.  Accordingly, basic and diluted earnings per share are equal.

2017

2016

2015

Earnings attributable to Company’s owners

Weighted average number of common shares issued

2,519,310

2,947,098

536,279

683,509,869

683,509,869

683,509,869

Basic and diluted earnings per share (reais per share)

3.69

4.31

0.78

24          Operating segment information     

In 2016, the Company started to provide water connections only to customers (residential, commercial and industrial) who also
requested a connection to the sewage system. Prior to that, the Company offered water connections even if the customer did not
request a sewage connection.

The objective of this measure, which has been applied to all municipalities operated by SABESP, is to reduce the pollution caused
by the disposal of sewage in streams, rivers, beaches and phreatic zones, and to expand the benefits to the environment and the
health of the population.

The decision to offer water connections only to customers who also connect to the sewage system was taken by the main operating
decision maker, which in the case of SABESP is the Board of Executive Officers, since it believes that the Company must provide
sanitation services rather than individual water and sewage services only.

This structural change in the business has also changed the focus on decision making. In this way, the analysis of the activities was
carried out on a consolidated basis, i.e., the Company has only one operating segment – sanitation – rather than the previously
presented segments, water and sewage, as shown below:

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Result

Gross operating revenue

Gross sales deductions

Net operating revenue

2017

Sanitation (i)

Reconciliation to the
financial statements (ii)

Balance as per financial
statements

12,223,746

3,150,877

15,374,623

(766,390)

-

(766,390)

11,457,356

3,150,877

14,608,233

Costs, selling and administrative expenses

(7,566,104)

(3,080,542)

(10,646,646)

Income from operations before other operating expenses, net
and equity accounting

3,891,252

70,335

3,961,587

Other operating income / (expenses), net

Equity accounting

Financial result, net

Income from operations before taxes

(5,679)

5,760

(458,054)

3,503,614

Depreciation and amortization

1,301,897

-

1,301,897

(i) See note 31 for further information about non-cash items, other than depreciation and amortization that impact segmet results,
and for additionals to long-lived asset information;

(ii) Construction revenue and related costs not reported to the CODM.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Gross operating revenue

Gross sales deductions

Net operating revenue

2016

Sanitation (i)

Reconciliation to the
financial statements (ii)

Balance as per financial
statements

11,122,232

3,732,877

14,855,109

(756,901)

-

(756,901)

10,365,331

3,732,877

14,098,208

Costs, selling and administrative expenses

(7,026,699)

(3,651,364)

(10,678,063)

Income from operations before other operating expenses, net
and equity accounting

3,338,632

81,513

3,420,145

Other operating income / (expenses), net

Equity accounting

Financial result, net

Income from operations before taxes

4,722

4,740

699,447

4,129,054

Depreciation and amortization

1,146,626

-

1,146,626

(i) See note 31 for further information about non-cash items, other than depreciation and amortization that impact segmet results,
and for additionals to long-lived asset information;

(ii) Construction revenue and related costs not reported to the CODM.

Gross operating revenue

Gross sales deductions

Net operating revenue

2015
(Restated)

Sanitation (i)

Reconciliation to the
financial statements (ii)

Balance as per financial
statements

8,946,825

3,336,716

12,283,541

(571,972)

-

(571,972)

8,374,853

3,336,716

11,711,569

Costs, selling and administrative expenses

(5,550,122)

(3,263,808)

(8,813,930)

Income from operations before other operating expenses, net
and equity accounting

2,824,731

72,908

2,897,639

Other operating income / (expenses), net

Equity accounting

Financial result, net

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143,755

2,597

(2,456,462)

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Income from operations before taxes

587,529

Depreciation and amortization

1,074,032

-

1,074,032

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(i) See note 31 for further information about non-cash items, other than depreciation and amortization that impact segmet results,
and for additionals to long-lived asset information;

(ii) Construction revenue and related costs not reported to the CODM.

The impacts on gross operating income and costs are as follows:

2017

2016

2015

Gross revenue from construction recognized under IFRIC 12  (a)

3,150,877

3,732,877

3,336,716

Construction costs recognized under IFRIC 12 (a)

(3,080,542)

(3,651,364)

(3,263,808)

Construction margin

70,335

81,513

72,908

(a)    Revenue from concession construction contracts is recognized in accordance with IAS 11 - Construction Contracts, using

the percentage-of-completion method. See Note 13 (f).

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

25          Insurance

The  Company  has  insurance  that  covers  fire  and  other  damage  to  its  assets  and  office  buildings,  and  liabilities  to  third  parties,
among others. It also has civil liability insurance for the members of the Board of Directors and Board of Executive Officers (“D&O
insurance”)  and  guarantee  insurance  for  escrow  deposit  (as  described  in  Note  19  (e))  and  traditional  guarantee  insurance.  The
Company contracts insurance through bidding processes with the participation of the main Brazilian and international insurance
companies that operate in Brazil.

As of December 31, 2017, the Company’s insurance coverage is as follows:

Specified risks – fire

Engineering risk

Guarantee insurance for escrow deposit

Traditional guarantee insurance

Civil liability– D&O (Directors and Officers)

Civil liability – works

Domestic and international transportation

Civil liability – operations

Other

Total

26          Operating revenue

(a)   Revenue from sanitation services:

Metropolitan region of São Paulo

Regional Systems

Total

Coverage

2,007,219

1,043,368

500

100

100

85,530

448

3,000

14

3,140,279

2017

2016

2015

8,636,926

3,586,820

7,749,694

3,372,538

12,223,746

11,122,232

6,021,949

2,924,876

8,946,825

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(b)    Reconciliation between gross operating income and net operating income:

2017

2016

2015

Revenue from sanitation services (i)

12,223,746

11,122,232

8,946,825

Construction revenue

Sales tax

Regulation, Control and Oversight Fee (TRCF)

Net revenue

3,150,877

(757,619)

(8,771)

3,732,877

(756,901)

-

3,336,716

(571,972)

-

14,608,233

14,098,208

11,711,569

(i) Includes the amount of R$8,771 corresponding to the TRCF charged from customers from the municipalities regulated by
ARSESP.

27           Operating costs and expenses

Operating costs

     Salaries, payroll charges and benefits

     Pension obligations

     Construction costs (Note 24)

     General supplies

     Treatment supplies

     Outsourced services

     Electricity

     General expenses

     Depreciation and amortization

Selling expenses

2017

2016

2015

(1,841,571)

(48,381)

(1,718,199)

(1,503,383)

131,469

(75,247)

(3,080,542)

(3,651,364)

(3,263,808)

(163,712)

(287,592)

(857,063)

(794,352)

(531,985)

(173,224)

(279,150)

(845,334)

(932,435)

(471,965)

(172,561)

(269,294)

(791,156)

(815,164)

(369,213)

(1,173,765)

(1,072,918)

(1,000,937)

(8,778,963)

(9,013,120)

(8,260,763)

     Salaries, payroll charges and benefits

(305,440)

(271,690)

(237,848)

     Pension obligations

     General supplies

     Outsourced services

     Electricity

     General expenses

     Depreciation and amortization

        Bad debt expense, net of recoveries (Note 9 (c))

Administrative revenue (expenses)

     Salaries, payroll charges and benefits

     Pension obligations

     GESP Reimbursement – benefits paid (Note 10 (a) (vii))

     General supplies

     Outsourced services
     Electricity

https://www.sec.gov/Archives/edgar/data/1170858/000129281418001977/sbsform20f_2017a.htm

(7,296)

(4,451)

17,941

(3,585)

(258,287)

(278,565)

(762)

(94,112)

(15,664)

(82,681)

(751)

(93,180)

(9,729)

(90,488)

(9,761)

(3,692)

(247,687)

(770)

(86,064)

(9,883)

(2,420)

(768,693)

(730,047)

(598,125)

(229,752)

(171,830)

-

(5,675)

(183,746)
(965)

(194,357)

(136,358)

-

(2,585)

(154,926)
(1,848)

(182,215)

(185,206)

696,283

(2,340)

(123,802)
(1,596)

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     General expenses

     Depreciation and amortization

     Tax expenses

Operating costs and expenses

     Salaries, payroll charges and benefits

     Pension obligations

     GESP Reimbursement – benefits paid (Note 10 (a) (vii))

     Construction costs (Note 24)

     General supplies

     Treatment supplies

     Outsourced services

     Electricity

     General expenses

     Depreciation and amortization

     Tax expenses

        Bad debt expense, net of recoveries (Note 9 (c))

(302,113)

(112,468)

(92,441)

(289,862)

(63,979)

(90,981)

(1,098,990)

(934,896)

(11,467)

(63,212)

(81,487)

44,958

(2,376,763)

(2,184,246)

(1,923,446)

(227,507)

-

13,052

-

(270,214)

696,283

(3,080,542)

(3,651,364)

(3,263,808)

(173,838)

(287,592)

(179,394)

(279,150)

(178,593)

(269,294)

(1,299,096)

(1,278,825)

(1,162,645)

(796,079)

(928,210)

(935,034)

(855,007)

(817,530)

(466,744)

(1,301,897)

(1,146,626)

(1,074,032)

(92,441)

(82,681)

(90,981)

(90,488)

(10,646,646)

(10,678,063)

(81,487)

(2,420)
(8,813,930)

F-120

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

28          Financial Income (Expenses)

Financial expenses

Interest and charges on borrowings and financing – local currency (i)

Interest and charges on borrowings and financing – foreign currency

Other financial expenses (ii)

Income tax over international remittance

Inflation adjustment on borrowings and financing (iii)

Inflation adjustment on Sabesprev Mais deficit

Other inflation adjustments (iv)

Interest and inflation adjustments on provisions (v)

Total financial expenses

Financial income

Inflation adjustment gains (vi)

Income on short-term investments (vii)

Interest income (viii)

Cofins and Pasep

Other

Total financial income

2017

2016

2015

(289,780)

(119,100)

(97,533)

(17,901)

(62,787)

-

(50,941)

(50,238)

(688,280)

89,010

195,992

57,166

(16,366)

442

326,244

(317,379)

(113,268)

(86,372)

(18,823)

(121,036)

(891)

(48,634)

(133,488)

(839,891)

152,154

209,376

99,068

(23,535)

11,647

448,710

(326,315)

(127,352)

(149,902)

(20,389)

(171,735)

(1,529)

(20,594)

(41,916)

(859,732)

166,887

170,551

44,358

(7,947)

21,385

395,234

Financial income (expenses), net before exchange rate changes

(362,036)

(391,181)

(464,498)

Net exchange gains (losses)

Exchange rate changes on borrowings and financing (ix)

Other exchange rate changes

Exchange gains

Exchange rate changes, net

(96,300)

(54)

336

1,090,466

(1,992,019)

(209)

371

(720)

775

(96,018)

1,090,628

(1,991,964)

Financial income (expenses), net

(458,054)

699,447

(2,456,462)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

(i)      Interest expenses on loans and financing in local currency decreased mainly as a result of the variation of floating
interest rates that remunerate these agreements. The main variations were in the average CDI and TJLP, of 9.9% and
7.0%, respectively, in 2017 (14.0% and 7.5%, respectively, in 2016).

(ii)        The  variation  in  other  financial  expenses  is  mainly  a  result  of  the  increase  in  expenses  with  the  present  value
adjustment of long-term liabilities and funding costs related to loans and financing. In 2016, other financial expenses
decreased, especially due to the lower accounting of interest of the PPP agreement of Sistema Produtor Alto Tietê –
CAB – SPAT.

(iii)   The monetary variation derives mainly from the lower variation of the IPCA in 2017, versus 2016 (2.95% and 6.29%,
respectively). The exposures to this rate are shown in Note  5.1 (d). In 2016, the inflation adjustment derives mainly
from the lower variation of the IPCA in 2016, versus 2015 (6.29% and 10.67%, respectively).

(iv)    Expenses  mainly  related  to  inflation  adjustments  related  to  the  commitments  required  by  public-private
partnerships,  program  contracts  commitments  and  agreements.  In  2016,  the  increase  was  essentially  due  to  the
restatement of liabilities related to the commitments required by public-private partnerships and leases.

(v)     The decrease arises from the decline in the rate practiced by the Court, from 7.39% in 2016 to 1.94% in 2017. In
2016,  the  variation  was  mainly  due  to  the  recognition  of  higher  interest  and  inflation  adjustment  on  the  2016
lawsuits, due to the revision of the estimated probability of loss, arising from decisions that were unfavorable to the
Company.

(vi)      The  monetary  variation  gains  decrease  due  to  the  lower  restatement  of  the  agreement  entered  into  with  the  São
Paulo State Government (GESP) in 2017 and the reduction in the National Consumer Price Index (INPC), used to
restate escrow deposits.

(vii)  The decrease is a result of the decrease in the CDI rate, of 13.75% p.a. in 2016 and 6.89% p.a. in 2017. In 2016, the

increase is due to the higher average balance of investments compared to 2015.

(viii) The R$ 39,567 decrease in interest income arises mainly from the recognition of present value adjustment on new
installment  payment  agreements  entered  into  with  customers  in  2017.  In  2016,  the  R$54,710  increase  in  interest
income is essentially due to lower interest on installment agreements in 2015.

 (ix)  The change in expenses mainly reflects the appreciation of the U.S. dollar and the Yen against the Real in 2017 (1.5%
and 5.3%, respectively), compared to the depreciation presented in 2016 (16.5% and 13.9%, respectively). In 2016,
the change in expenses mainly reflects the depreciation of the U.S. dollar against the real in 2016 (16.5% and 13.9%,
respectively), compared to the appreciation presented in 2015 (47.0% and 45.9%, respectively).

F-123

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

29          Other operating income (expenses), net

Other operating income, net

Other operating expenses

2017

2016

2015

75,410

(81,089)

62,570

(57,848)

190,840

(47,085)

Other operating income (expenses), net

(5,679)

4,722

143,755

Other operating income is comprised by sale of property, plant and equipment, sale of contracts awarded in public bids, right to
sell electricity, indemnities and reimbursement of expenses, fines and collaterals, property leases, reuse water, PURA projects and
services.

Other  operating  expenses  consist  mainly  of  derecognition  of  concessions  assets  due  to  obsolescence,  discontinued  construction
works, unproductive wells, projects considered economically unfeasible, losses on property, plant and equipment and exceeding
cost of electricity sold.

30          Commitments

The  Company  has  agreements  to  manage  and  maintain  its  activities,  as  well  as  agreements  to  build  new  projects  aiming  at
achieving the objectives proposed in its target plan. Below, the main committed amounts as of December 31, 2017:

Contractual obligations –
Expenses
Contractual obligations –
Investments

Total

1 year

1-3 years

3-5 years

More than
5 years

Total

1,459,864

1,779,320

3,239,184

1,151,641

2,121,493

3,273,134

381,119

1,216,835

4,209,459

1,031,762

1,412,881

5,970,069

10,902,644

7,186,904

15,112,103

The main commitment refers to São Lourenço PPP. See Note 14 (g).

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

31           Supplemental cash flow information

2017

2016

2015

Total additions to intangible assets (Note 14 (b))

3,490,298

3,855,831

3,604,442

Items not affecting cash (see breakdown below)

(1,532,518)

(1,747,664)

(1,207,090)

Total additions to intangible assets as per statement of cash flows

1,957,780

2,108,167

2,397,352

Investments and financing operations affecting intangible assets but not cash:

Interest capitalized in the year (Note 14 (d))

Contractors payable

Program contract commitments

Public Private Partnership - São Lourenço PPP (Note 14 (g))

Leases

Construction margin (Note 24)

Other

Total

   Events after the reporting period

Tariff revision

649,048

213,340

95,126

501,591

3,078

70,335

-

700,743

57,431

4,262

893,181

10,534

81,513

-

466,544

(57,041)

136,543

548,978

36,877

72,908

2,281

1,532,518

1,747,664

1,207,090

-  On  January  16,  2018,  the  São  Paulo  State  Sanitation  and  Energy  Regulatory  Agency  (ARSESP)  published  Public  Consultation
Notice 01/2018 ("Notice"), asking the public for opinions and inputs on the calculation methodology to be adopted in the final
stage of SABESP’s Second Ordinary Tariff Revision.

- On January 19, 2018, ARSESP published Resolution 780, which includes the events calendar of the final stage of SABESP’s 2nd

Ordinary Tariff Revision.

The  Final  Maximum  Average  Tariff  (Final  P0)  will  be  disclosed  by  May  10,  2018,  and  applied  pursuant  to  article  39  of  Law
11,445/2007. 

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

Differences in revenue arising from differences in the amounts authorized on October 10, 2017 (Preliminary P0) and the tariffs
to be calculated at the final stage of the Second Ordinary Tariff Revision (Final P0) will be duly offset and applied to the water
supply and sewage public utility service tariffs. 

Additionally, ARSESP published Public Hearing Notice 01/2018, referring to Stage 2 of the schedule, which was held on January
29, 2018.

- On February 21, 2018, ARSESP released the Business Plan, which is the object of SABESP’s Second Ordinary Tariff Revision.

    As part of the Business Plan, on page 85, the Company highlights “Table: CAPEX - Program disbursements”, which totals R$
13.9  billion  (unaudited)  for  the  2017-2021  period,  which  is  available  to  the  market,  and  “Table:  CAPEX  -  Program
constructions”, which totals R$ 15.5 billion (unaudited) for the 2017-2021 period.

- On March 26, 2018, ARSESP disclosed Preliminary Technical Note NT.F-0004-2018 that included the Proposal for Calculation

of the Maximum Average Tarif (P0) of SABESP’s Second Ordinary Tariff Revision and Factor X: Final Stage.

The Period for Consultation and Public Hearing 03/2018 is from March 27, 2018 to April 17, 2018.

Final Regulatory Remuneration Base

WACC

Factor X

P0

Tariff Repositioning Index (IRT)

R$ 38.4 billion

8.11%

0.9287%

R$ 3.8207/m3
4.7744%

The proposed Tariff Repositioning Index of 4.7744% should be applied on a straight line basis to the current tariff tables.

22nd Issue Debentures

On February 19, 2018, the Company conducted the 22th  Issue  of  unsecured  non-convertible  debentures,  in  the  total  amount  of
R$750,000, in three series, for tender offer, pursuant to CVM Rule 476. The first series, in the amount of R$100 million, maturing
in  3  years  and  remuneration  of  CDI  +  0.58%  p.a.,  the  second  series,  in  the  amount  of  R$400  million,  maturing  in  5  years  and
remuneration of CDI + 0.90% p.a., and the third series, in the amount of R$250 million, maturing in 7 years and remuneration of
IPCA  +  6.00%  p.a..  Funds  deriving  from  funding  by  means  of  the  22th  Issue  of  Debentures  will  be  allocated  to  refinance  the
financial commitments and to recover the level of cash balances.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2017, 2016 and 2015
Amounts in thousands of reais, unless otherwise indicated 

SABESP’s Corporate Reorganization

On  March  11,  2018,  the  São  Paulo  State  Government  ("Government")  received  a  letter  from  a  group  of  investors  about  the
potential acquisition of part of the shares, which will be owned by the Government, to be issued by the Parent Company referred
to  in  State  Law  16,525/2017.  The  letter  will  be  analyzed  by  the  Board  of  the  State  Privatization  Program  (CDPED),  which  is  in
charge  of  deciding  about  the  continuity  and  the  conditions  for  the  creation  of  the  Parent  Company  and  SABESP’s  corporate
reorganization.  The  operation  addressed  at  the  letter  will  be  structured  to  occur  exclusively  within  the  scope  of  the  Parent
Company, not affecting SABESP’s control, which will remain with the Government in a manner consistent with the provisions of
said state law. The investors’ identity and the content of the aforementioned letter will remain confidential, pursuant to the rules
applicable to the administrative procedure established by CDPED for the purposes of the operation.

São Lourenço Production System

On April 3, 2018, Sabesp inaugurated the São Lourenço Production System that will increase treated water production capacity by
approximately 6.4 m³/s.

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