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Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp

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FY2018 Annual Report · Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 20‑F

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, 2018

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 (SBS)

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.

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

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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TABLE OF CONTENTS

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 I
IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS
ITEM 1.
OFFER STATISTICS AND EXPECTED TIMETABLE
ITEM 2.
KEY INFORMATION
ITEM 3.
ITEM 4.
INFORMATION ON THE COMPANY
ITEM 4A. UNRESOLVED STAFF COMMENTS
ITEM 5.
ITEM 6.
ITEM 7.
ITEM 8.
ITEM 9.
ITEM 10.
ITEM 11.
ITEM 12.
PART II
ITEM 13.
ITEM 14. MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS
ITEM 15.
ITEM 16.
ITEM 16A. AUDIT COMMITTEE FINANCIAL EXPERT
ITEM 16B. CODE OF ETHICS
ITEM 16C. PRINCIPAL ACCOUNTANT FEES AND SERVICES
ITEM 16D. EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES
ITEM 16E. PURCHASES OF EQUITY SECURITIES BY ISSUER AND AFFILIATED PURCHASERS
ITEM 16F. CHANGE IN REGISTRANT'S CERTIFYING ACCOUNTANT
ITEM 16G. CORPORATE GOVERNANCE
ITEM 16H. MINE SAFETY DISCLOSURE
PART III
ITEM 17.
ITEM 18.
ITEM 19.

FINANCIAL STATEMENTS
FINANCIAL STATEMENTS
EXHIBITS

CONTROLS AND PROCEDURES
[Reserved]

DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES

Page
5
5
5
5
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105
108
110
122
123
126
126
126
126
127
127
127
127
128
128
128
128
132
133
133
133
133

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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, 2018 and 2017 and for each of the years in the three-year period ended December 31, 2018 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, 2018 were partially affected by the new consumption habits
of our consumers that have impacted the volume of water billed.  In the years 2014 and 2015, the drought was more intense in the northwest
region of the State of São Paulo, resulting in the lowest stream flow measurements in over 80 years. With the return of the rainfall to historical
levels 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.  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, 2018, the reservoirs in the
São Paulo metropolitan region, where our largest market is located, contained 943.3 million m3 of water storage for treatment (including the São
Lourenço  System,  a  new  supply  system  which  expands  our  production  capacity  by  6  m³/s  and  which  commenced  operation  in  July  2018),
compared to 916.8 million m3 available for treatment as of December 31, 2017. 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 2014-2015 Water Crisis”.  Average monthly water production
in 2018 for the São Paulo metropolitan region was 60.9 m³/s, compared to 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  2014-2015  water  crisis  impacted  the  water  supply  in  the
metropolitan region of São Paulo and affected the water consumption practices that have been influencing the volume of water billed” and “Item
4.B. Business Overview—The 2014-2015 Water Crisis”.

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:

·        “ANA” are to Water National Agency (Agência Nacional de Águas);

·        “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 securities and exchange commission;

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·                “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;

·        “¥” or “Japanese yen” are the official currency of Japan;

·        “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 332 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; and

·        “water crisis” are to the drought we 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).

Our Contracts and the Municipalities We Serve

Throughout this document, we refer to the 369 municipalities we serve and to our 373 contracts. This difference results from the fact that we
have two partial water contracts with the municipality of Mogi das Cruzes, where the majority of population is serviced on a wholesale basis,
though it has not been included in the total number of municipalities we serve. Additionally, we have a further two contracts, which we entered
with the municipalities of Aguaí and Guarulhos, where the operations did not commence by the end of 2018. Most of our contracts with the
municipalities we serve are program contracts which have a term of 30 years.

Throughout the report we mentioned that we serve five municipalities in our wholesale segment (Guarulhos, Mauá, Mogi das Cruzes, Santo
André  and  São  Caetano  do  Sul)  since  our  revenue  for  the  fiscal  year  2018  is  derived  from  369  municipalities  we  serve  as  part  of  our  retail
operations  and  five  municipalities  we  serve  on  a  wholesale  basis.  However,  in  December  2018,  we  entered  into  an  agreement  with  the
municipality  of  Guarulhos  and,  as  of  January  2019,  we  started  operations  in  the  municipality  as  part  of  our  retail  operations.    For  further
information on this agreement, see “Item 4.B. Business Overview—Wholesale Operations—Wholesale Water Services” and Note 9 to our 2018
financial statements included in this annual report.

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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 we do not
know if they will return to their prior standards 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,  or  any  other  type  of

reorganization that might be approved by the government that may include change in control;

·        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 potential impacts of Provisional Measure No. 868/2018 on our business if it is converted into law;

·        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.

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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,  2018  and  2017  and  for  the  years  ended  December  31,  2018,  2017  and  2016  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, 2016, 2015 and 2014 and for the years ended December 31, 2015 and 2014 have been derived from our audited financial
statements, presented in accordance with IFRS, which are 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, 2014 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,

2018

R$

2017

R$

2016

R$

2015

R$
(1) 

(in millions, except per share and per ADS 

data

Selected Income Statement Data:

Net operating revenue
Cost of services
Gross profit
Selling expenses
Allowance for doubtful accounts(*)
Administrative income (expenses)
Operating profit
Financial income (expenses), net
Profit for the year
Earnings per share – basic and diluted
Earnings per ADS – basic and diluted
Dividends and interest on shareholders’ equity per share
Dividends and interest on shareholders’ equity per ADS
Weighted average number of common shares outstanding

16,085.1
(9,086.5)
6,998.6
693.5
(166.7)
(996.9)
5,176.6
(1,264.3)
2,835.1
4.15
4.15
0.99
0.99
683,509,869

14,608.2
(8,779.0)
5,829.2
(686.0)
(82.7)
(1,099.0)
3,961.7
(458.1)
2,519.3
3.69
3.69
0.19
0.19
683,509,869

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
683,509,869

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
683,509,869

2014

R$

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
683,509,869

(*)       Starting January 1, 2018, we adopted IFRS 9. As a result, in 2018 and 2017 we now recorded our allowance for doubtful accounts in the income statements as a separate item. In 2016,
2015 and 2014, the amounts of allowance for doubtful accounts in the income statements were R$90.5 million, R$2.4 million and R$139.6 million and were presented as part of our
selling expenses.

(1)       ADS-American Depositary Share.

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  Selected Statement of Financial Position Data

Property, plant and equipment
Contract asset (*)
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

2018

R$

2017

R$

2016

R$

2015

R$

2014

R$

267.6
7,407.9
29,012.5
43,565.1
2,103.6

11,049.2

673.8
24,013.4
19,551.7
15,000.0

3,842.9
(2,189.3)
(907.5)

(2,183.2)

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)

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)

(*)     As of December 31, 2018, with the adoption of IFRS 15 - Revenue from contract with customer, since 1 January 2018, assets related to concessions under construction, registered under the scope of
IFRIC 12 - Concession Contracts, have been classified as Contract Assets during the construction period and transferred to Intangible Assets only after completion of the works. For more information
on this adoption, see Note 4.1 to our 2018 financial statements included in this annual report.

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

2018
9,053
7,495

95

83
98

90

76
2,107.9
19.5

30.1
293
14,449

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
1,990.3
20.8
31.8
308
14,137

(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).

(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).

B.      Capitalization and Indebtedness

Not applicable.

C.      Reasons for the Offer and Use of Proceeds

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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 and monetary policies;

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

·        currency fluctuations;

·         changes in labor regulations;

·         political elections;

·        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.

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.

New and amended Brazilian policies and regulations could have a material adverse effect on our business, financial condition and results of
operations.  In  addition,  uncertainty  over  whether  the  acting  Brazilian  government  will  have  the  political  power  or  will  to  implement  other
needed  policies  or  regulations  affecting  the above or other factors in the future may also contribute to economic uncertainty in  Brazil  and  to
heightened volatility in the securities issued abroad by Brazilian companies.

Following the impeachment of former President Dilma Rousseff, the Vice-President Michel Temer formally took office on August 31, 2016.
Following  a  divisive  presidential  race,  Congressman  Jair  Bolsonaro  defeated  Mr.  Fernando  Haddad  in  the  second  round  of  elections  held  on
October 28, 2018, and became Brazil’s president on January 1, 2019.

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.

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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
executive 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 ended in December 2018. The Temer government was marked by significant political and economic
turmoil, allegations of corruption, political deadlock, slow economic recovery, national transport strikes, low approval rates and foreign trade
disputes, among other factors. Mr. Temer himself has recently been accused by the Federal Public Prosecutor of allegations of corruption. The
potential  result  of  the  ongoing  corruption  scandals  and  their  related  investigations  is  uncertain.  Following  a  divisive  presidential  race,
Congressman Jair Bolsonaro defeated Mr. Fernando Haddad in the second round of elections held on October 28, 2018, and became Brazil’s
President on January 1, 2019. See “Item 3.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”.

We  cannot  assure  you  that  the  newly  elected  federal  government  will  continue  with  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.  It is also unclear what changes the newly elected government will make to our sector.

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 6.40%, 6.90% and 13.65% at the end of 2018, 2017
and 2016, 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 3.75%, 2.95% and 6.29% during 2018, 2017 and 2016, 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.

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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  has  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. During 2018,
the real was  very  volatile  and  depreciated  by  17.1%  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 April 17, 2019, the commercial selling rate as reported by the Central Bank was R$3.9225 per
US$1.00.

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.

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.

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$6,669.4  million  as  of
December 31, 2018 and we anticipate that we may incur additional amounts of foreign currency denominated debt in the future.  In 2018, our
results  of  operations  were  negatively  affected  by  the  17.1%  depreciation  of  the  real against  the  U.S.  dollar,  and  the  depreciation  of  the  real
against the yen by 20.0%, which together led to a R$915.9 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 2018 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.

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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 December 31, 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  2019,  following  the  elections  for  State  governor  in  2018,  Mr.  João  Doria,  elected  governor,  appointed  Mr.  Benedito  Pinto
Ferreira  Braga  Junior  as  our  Chief  Executive  Officer  with  a  term  expiring  in  June  2019.  Additionally,  pursuant  to  our  bylaws,  Mr.  Benedito
Pinto  Ferreira  Braga  Junior  is  also  a  member  of  our  board  of  directors  while  holding  the  position  of  Chief  Executive  Officer.  The  Board  of
Directors  also  elected  as  part  of  our  executive  officers,  Mr.  Adriano  Candido  Stringhini  as  Corporate  Management  Officer,  and  Mr.  Ricardo
Daruiz Borsari as Regional Systems Officer for a term expiring in June 2019. In March 2019, Monica Ferreira do Amaral Porto joined our board
of directors. We cannot guarantee that there will not be further changes to our Board of Directors or Executive Officers and whether such further
changes 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. Due to elections for state government in the
second  half  of  2018,  this  operation  was  suspended,  and  we  are  currently  awaiting  guidance  from  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, or any other type of corporate reorganization, including a change of control. We cannot assure that any
potential corporate reorganization, including a change of control, will not have a material adverse effect on our business.

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, 2018, the State owed us R$105.7 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. At the end of 2018 several lawsuits were filed against the Government of the State of
São Paulo for the collection of such debts.

With  respect  to  payment  of  pensions  on  behalf  of  the  State,  we  had  a  contested  credit  amount  of  R$1,107.1  million  as  of  December  31,
2018.  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,  2018,  we  had  a  provision  for  an  actuarial  liability  in  the  amount  of  R$2,606.1  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 Note10 of our 2018 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  2018  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”.

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Our right to withdraw water from the Guarapiranga and Billings reservoirs is being challenged judicially by minority shareholders of
EMAE.

We withdraw 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
withdraw 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 withdrawing 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 case is in its initial phase.

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  our  condemnation  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 is currently being appealed.

The settlement agreement between EMAE and us does not necessarily put an end to the separate lawsuits.

If one of the ongoing lawsuits by minority shareholders of EMAE requires the State to make a different decision regarding water use from
what was agreed between EMAE and the State of São Paulo, our ability to withdraw water from the Guarapiranga and Billings reservoirs may
be compromised.  If we were no longer able to withdraw 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  2014-2015  water  crisis  impacted  the  water  supply  in  the  metropolitan  region  of  São  Paulo  and  affected  the  water  consumption

practices that have been influencing the volume of water billed.

When considering all the water sources that supplied the metropolitan region of São Paulo in the last five hydrological years (which runs
from October to September), the level of rainfall has fallen below the expected historical average. In the hydrological year 2012/2013, rainfall
was 101% of the average expected for the period. In the following years, rainfall has been below the historical average: for the hydrological
years  2013/2014,  2014/2015,  2015/2016,  2016/2017,  2017/2018,  the  rainfall  for  thoses  periods  was  80%,  96%,  97%,  91%  and  71%  of  the
historical average, respectively.

For  the  years  2014  and  2015,  we  experienced  a  severe  drought  in  the  metropolitan  region  of  São  Paulo,  which  was  more  intense  in  the
northwest region of the State of São Paulo, resulting in the lowest level of rainfall ever recorded in the Cantareira System, the largest production
system in the metropolitan region of São Paulo, over the last 80 years of record. This drought severely affected the level of water sources that
supply the metropolitan region of São Paulo, forcing us to adopt a series of measures to mitigate its impact and maintain the water supply for the
20.9 million inhabitants served in the metropolitan region of São Paulo.

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  2014-2015  Water
Crisis”.

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 2018 for the São Paulo metropolitan region was 60.9 cubic meters per second, or m³/s, compared to 60.6 m³/s in 2017, 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.

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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. In 2018, the volume of water billed increased 1.5% and the gross operational revenue
increased by 16.6% compared to 2017.

Although the investments we made since 2014 have brought improvements to the water security in the metropolitan region of São Paulo,
there  is  still  a  risk  that  there  might  be  further  droughts  similar  or  more  severe  to  that  of  2014-2015  in  the  future  forcing  us  to  adopt  similar
measures as those adopted in 2014-2015.

At the end of March 2019, the total volume of water stored in the reservoirs that supply the metropolitan region of São Paulo was 1,441.3
million m³ (including the volume from São Lourenço System, the ninth system that commenced operations in March 2018) compared to 1,162.8
million m³ at the end of March 2018, 1,223.9 million m³ at the end of March 2017 and 1,178.8 million m³ at the end of March 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 Water National Agency (Agência Nacional de Águas, or 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 withdraw 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 withdraw up to 33m3/s; (ii) if the volume of water is between 40%
and 60% of the reservoirs’ capacity, we can withdraw up to 31m3/s; (iii) if the volume of water is between 30% and 40% of the reservoirs’
capacity, we can withdraw up to 27m3/s; (iv) if the volume of water is between 20% and 30% of the reservoirs’ capacity, we can withdraw
up to 23m3/s; and (v) if the volume of water available is lower than 20% of the reservoirs’ capacity, we can withdraw 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 2019. See “Item 4.B. Business Overview—Energy Consumption”.

· 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)” - Tariff Structure - Water and sewage services tariffs and “Item 5.A. Operating and Financial
Review and Prospects—Factors Affecting Our Results of Operations—Effects of Tariff Increases”.

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· 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 No. 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. However, article 54-C, which set out the rules for the off-setting of tax credits, was
vetoed  by  the  President  of  Brazil  and,  accordingly,  we  cannot  predict  what  benefits  the  Special  Incentives  for  the  Development  of  Basic
Sanitation Regime will bring to us. In 2016, Law No.  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  in  condominiums.
 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
No. 11,445/2007 and the Federal Decree No. 7,217/2010 will have on our business and operations, if any.

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 operational 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 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.

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.

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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 Supplementary  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 Ribeirão Preto (LCE No. 1,290/2016), as well as the
urban clusters of Jundiaí (LCE No. 1,146/2011), Piracicaba (LCE No. 1,178/2012) and Franca (LCE No. 1,323/2018).  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.

In July 2018, Provisional Measure No. 844/2018 was issued in order to update Basic Sanitation Law No. 11.445/2007 and amend Law No.
9,984, of July 17, 2000, to assign to the National Water Agency competence to establish reference standards for sanitation services, among other
aspects. This Provisional Measure expired in November 2018 without being converted into law.

On December 28, 2018, Provisional Measure No. 868/2018 was issued with the same purpose of Provisional Measure No. 844/2018, which
aims to amend the Basic Sanitation Law No. 11,445/2017; Law No. 9,984/2000, to attribute to the National Water Agency the power to enact
national reference rules about the sanitation service; Law No. 10,768/2003 to change the role of the Water Resources Specialist; and Law No.
13,529/2017  to  authorize  the  Federal  Government  to  participate  in  the  fund  with  the  exclusive  purpose  to  provide  financial  support  for
specialized  technical  services.  This  Provisional  Measure  is  valid  until  June  3,  2019  and  its  conversion  into  law  is  pending  approval  by  the
National Congress. Although this Provisional Measure has been in force since the date of its publication, it is not yet possible to predict how it
will impact contracts that we may enter into while the measure is in force.

If the Provisional Measure No. 868/2018 is converted into law, it could have a material adverse effect on our business, results of operations

and financial condition.

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”.

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 72.2% of our gross operating revenue from services in 2018.

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,  which  was  subsequently  converted  into  Federal  Law  No.  13,683/2018  and  by  Provisional  Measure  No.  862  of
December  4,  2018,  establishing:  (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.

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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  47.0%  of  our  gross  operating  revenues  (excluding

revenues relating to the construction of concession infrastructure) in the year ended December 31, 2018.

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.

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

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.

On May 9, 2018, ARSESP announced the final result of the Second Ordinary Tariff Revision. Following this revision cycle, ARSESP will
pass-through to the tariffs up to 4% of the municipal revenue that is transferred by us to a legally established municipal infrastructure fund. Our
only contract that provides for this and complies with ARSESP´s requirements is with the municipality of São Paulo and, accordingly, today 4%
of the funds transferred to the São Paulo Municipal Fund for Environmental Sanitation and Infrastructure are being passed through to our tariffs.

Although ARSESP is required to ensure that the tariffs will adequately compensate us for the services we provide, which includes the above
mentioned pass-through to tariffs, until May 2018 our existing tariff had never included any pass-through to tariffs 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.

Considering that ARSESP has limited to 4% the pass-through to tariff of values transferred to municipal infrastructure funds, the mandatory
transfer  of  7.5%  of  the  gross  revenues  to  the  Municipal  Fund  for  Environmental  Sanitation  and  Infrastructure,  will  not  be  passed  through  to
customers in full and we cannot assure you when this will happen.

As of December 31, 2018, since 2010 we have transferred approximately R$3.1 billion to the São Paulo Municipal Fund for Environmental
Sanitation and Infrastructure. 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”.

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. On February 28, 2019, ARSESP rejected our reconsideration request
and maintained their original calculation of the financial component related to municipal funds. See Item “Item 4.B. Business Overview—Tariffs
—Second Ordinary Tariff Revision (2017-2020).”

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We  currently  lack  formal  agreements  or  concessions  with  35  of  the  municipalities  to  which  we  provide  service,  and  31  of  our  existing
concession agreements will expire between 2019 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,  2018,  we  held  formal  30-year  agreements  with  307  municipalities  (including  the  city  of  São  Paulo)  of  the
369  municipalities  we  serve.    We  entered  into  twenty  of  these  agreements  during  2018.    The  307  municipalities  with  which  we  had  formal
agreements at year-end accounted for 81.1% of our total revenues for the year ended December 31, 2018, and 80.2% of our intangible assets and
contract asset as of December 31, 2018.  Of the 35 served municipalities for which we lacked formal agreements at year-end, we were in the
process of actively renegotiating with all municipalities. Together, these 35 municipalities accounted for 6.1% of our total revenues for the year
ended December 31, 2018 and 12.3% of our intangible assets and contract asset as of that same date.  Between 2019 and 2030, 31 of our existing
concession agreements will expire. These 31 concession agreements accounted for 6.3% of our total revenues for the year ended December 31,
2018 and 5.3% of our intangible assets and contract asset 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 35 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.

Changes in the Basic Sanitation Law and in other laws related to it could have adverse effects on our negotiation with the municipalities and
we  cannot  evaluate  these  impacts  since  Provisionary  Measure  No.  868  is  still  under  discussion.  For  further  information,  see  Item  “3.D.  Risk
Facors—Current regulatory uncertainty, especially with regard to implementation and interpretation of the Brazilian Basic Sanitation Law, may
have an adverse effect on our business”.

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.”

In  the  municipalities  with  which  we  did  not  have  formal  agreements  by  December  31,  2018,  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.    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  No.  11,445/2007
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.

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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 20 to our 2018 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, 2018, our total accounts receivable was R$5,157.0 million. Of this amount, certain municipalities to which we provide
water on a wholesale basis owed us R$1,994.9 million, and certain municipal government entities owed us R$850.6 million.  Of the total amount
owed by municipalities, R$171.1 million was overdue by between 30 and 360 days and R$1,802.3 million was overdue by over 360 days.

The Brazilian courts could oblige 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.

Since  2012,  we  have  intensified  negotiations  with  municipalities  in  order  to  find  alternative  ways  of  receiving  these  sums  and  restoring
normal commercial relations with them. In 2014 we entered into an agreement with the municipality of Diadema. More recently, in December
2018, we entered into an agreement with the municipality of Guarulhos for the direct supply of water and sewage services for 40 years, subject
to regulation and oversight of ARSESP.

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, to date, no
agreement to supply water to these neighborhoods was concluded.

With respect to the municipality of Santo André, we signed a protocol of intention on May 11, 2017 but efforts did not culminate in any

agreement. In March 2019, we signed a new Protocol of Intentions with this 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$18.7 billion in the period from 2019 through 2023. In 2018 we

recorded R$4.2 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 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, among others, 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.  We are also
involved in proceedings challenging the water withdrawing in the face of the 2014-2015 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

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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 2014-2015 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 any 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”.

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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, 2018, the estimated total claims asserted amounted to R$57,498.4 million
(net of R$258.6 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$892.9 million (net of
escrow deposits) as of December 31, 2018. For more information, see Note 20 to our 2018 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”.

We are subject to anti-corruption, anti-bribery, anti-money laundering, sanctions and antitrust laws and regulations.  Our violation of any
such laws or regulations could have a material adverse effect on our reputation, our results of operations and our financial condition.

We are subject to anti-corruption, anti-bribery, anti-money laundering, sanctions, antitrust and other similar laws and regulations. We are
required  to  comply  with  the  applicable  laws  and  regulations  of  Brazil,  and  we  may  become  subject  to  such  laws  and  regulations  in  other
jurisdictions.  There  can  be  no  assurance  that  our  internal  policies  and  procedures  will  be  sufficient  to  prevent  or  detect  any  inappropriate
practices, fraud or violations of these laws or regulations by our employees, officers, executives, partners, agents and service providers, nor that
any such persons will not take actions in violation of our policies and procedures. Any violations, whether actual or perceived, by us or any of
our employees, directors, officers, partners, agents and service providers of these laws or regulations or our internal policies or procedures could
have a material adverse effect on our business, reputation, our ability to obtain financing, results of operations and financial condition.

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.

In this regard, the Internet Act (Law No. 12,965 of 2014) applies only to personal data collected through the Internet, and establishes other
principles and rules with respect to the privacy and protection of the personal and behavioral data of internet users. The Internet Act guarantees,
among  others,  the  privacy  of  internet  and  privately  stored  communications.  Any  data  processing  activity  is  subject  to  the  data  subject’s
informed, free and express consent. If we fail to comply with the provisions of the Internet Act, we may be subject to sanctions and penalties,
including damages, which will be assessed based on the nature and degree of our non-compliance, among other factors.

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On  August  15,  2018,  the  Brazilian  General  Law  for  Data  Protection  ("LGPD")  was  published  with  a  term  of  18  months  to  take  effect.
Subsequently,  on  December  28,  2018,  Provisional  Measure  No.  869/2018  was  published,  which,  in  summary,  created  the  National  Data
Protection  Authority  (ANPD),  linked  to  the  Brazilian  Presidency,  effective  since  the  date  of  publication  of  this  Provisional  Measure,  and
extending the initial term of validity regarding the obligations set out in the other articles to 24 months. The LGPD regulates the use of personal
data  in  Brazil.  The  LGPD  significantly  transformed  the  data  protection  system  in  Brazil  and  is  in  line  with  recent  European  legislation  (the
General Data Protection Regulation – “GDPR”). The LGPD establishes detailed rules for the collection, use, processing and storage of personal
data.  It  will  affect  all  economic  sectors,  including  the  relationship  between  customers  and  suppliers  of  goods  and  services,  employees  and
employers and other relationships in which personal data is collected, both in the digital and physical environment.

Failure by us to adhere to the LGPD and any additional privacy laws or regulations enacted or approved in Brazil or in other jurisdictions in

which we operate could adversely affect our reputation, business, financial condition or results of operations.

Industrial accidents, equipment failure, environmental hazards or other natural phenomena may adversely affect our operations, assets and
reputation and might not be covered by our insurance policies.

As of December 31, 2018, we provided water and sewage services to 369 municipalities in the state of São Paulo. We currently substantially
withdraw all of our water supply from surface sources from rivers and reservoirs, with a small portion being withdrawn 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. We have 229 dams for water supply purpose. Although we comply with all legal requirements and best practices for the management
of dams, invest in security inspections, monitoring and maintenance of all structures under our responsibility, our operations may be hampered
by  numerous  factors,  including  unexpected  or  unusual  geological  and/or  geotechnical  operating  conditions,  industrial  accidents,  floods  or 
droughts  or  other  environmental  occurrences  that  could  result  in    structural  damages  and  eventually  rupture  our  reservoirs,  dams  and  other
facilities or equipment. The occurrence of any of these events could lead to personal injury or death, adverse social impacts on the communities
located near our facilities, monetary losses and possible legal liability, other environmental damages, the loss of prime materials and damage to
our reputation. See "Item 4.B. Business Overview—Water Operations—Water Resources".

It is not always possible to obtain insurance against all such risks due to the high premiums associated with insuring against them or for
other reasons. Moreover, insurance against risks such as water contamination or other problems involving our water supply to customers and for
environmental related liabilities and damages as a result of our activities is not generally available to us or to other companies in our industry on
acceptable terms. Our insurance will not cover all potential risks associated with our operations and insurance coverage may not continue to be
available or may not be adequate to cover any resulting liability. Losses from these events may cause us to incur significant costs that could have
a material adverse effect on our financial performance and results of operations. To the extent that we incur losses not covered by our insurance
policies, the funds available for sustaining our current operations and for our expansion activities will be reduced.  See also “—Risks Relating to
Our  Business—Compliance  with  environmental  laws  and  environmental  liability  payments  could  have  a  material  adverse  effect  on  us”  and
“Item 4.B. Business Overview—Insurance”.

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 the unadjusted 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 52.9% of the aggregate
market capitalization of the B3 as of December 31, 2018.

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.

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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. 

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.

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If we issue new shares or our shareholders sell shares in the future, the market price of your ADS may be reduced.

Sales of a substantial number of shares, or the belief that this may occur, could decrease the prevailing market price of our common and
preferred shares and ADS by diluting the shares’ value. If we issue new shares or our existing shareholders sell shares they hold, the market
price  of  our  common  and  preferred  shares,  and  of  the  ADS,  may  decrease  significantly.  Such  issuances  and  sales  also  might  make  it  more
difficult for us to issue shares or ADS in the future at a time and a price that we deem appropriate and for you to sell your securities at or above
the price you paid for them. Our controlling shareholder, the Brazilian Government, may decide to capitalize us for a variety of reasons therefore
diluting existing shareholders and ADS holders.

 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, 2018, we generated net revenue of R$16,085.1 million and net income of
R$2,835.1 million.  Our total assets amounted to R$43,565.1 million and our total shareholders’ equity amounted to R$19,551.7 million as of
December 31, 2018.

As of December 31, 2018, we provided water and sewage services to a broad range of residential, commercial, industrial and governmental
customers in 369 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, 2018, we lacked formal agreements for 35 of the municipalities we serve, each of
which we are currently in the process of renegotiating.  From January 1, 2019 through 2030, 31 further concessions will expire, and we will seek
to replace them with program agreements.  In addition to the 369 municipalities we served, we also provided water services to the municipality
of  Mogi  das  Cruzes,  pursuant  to  two  partial  water  contracts  under  which  we  service  only  certain  neighborhoods  in  that  municipality.  See
“Presentation of Financial and Other Information—Other Information—Our Contracts and the Municipalities We Serve”.

We also supplied water on a wholesale basis to five municipalities in the São Paulo metropolitan region, including Guarulhos, in which we
did not operate water distribution systems (together covering a total estimated urban population of approximately 3.1 million residents). Four of
these  municipalities  also  utilized  our  sewage  treatment  services.    For  the  year  ended  December  31,  2018,  the  São  Paulo  metropolitan  region
(including the municipalities to which we provide water on a wholesale basis) accounted for 72.2% of our gross operating revenue (excluding
revenues  relating  to  the  construction  of  concession  infrastructure),  while  the  Regional  Systems  accounted  for  27.8%.  In  December  2018,  we
entered into an agreement with the municipality of Guarulhos for the direct supply of water and sewage services to the municipality. Operations
commenced in January 2019.

As  of  December  31,  2018,  we  provided  water  services  through  9.1  million  water  connections  to  approximately  25.1  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 7.5 million sewage connections to approximately 21.7 million people and had an
effective sewage service ratio of 83%.  As of December 31, 2018, we operated using 75,519 kilometers of water pipes and water transmission
lines and 51,788 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  only  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. Until the date of this annual report, we had not yet started construction. 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.

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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 December 31, 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
Infrastructure and Environment 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 Infrastructure and Environment 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 nine 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 a series of initiatives throughout 2014 and 2015, including the
Water Consumption Reduction Incentive Program. 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 disapplied 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  2014-2015
water  crisis  impacted  the  water  supply  in  the  metropolitan  region  of  São  Paulo  and  affected  the  water  consumption  practices  that  have  been
influencing the volume of water billed” and “Item 4.B Business Overview—The 2014-2015 Water Crisis”.

Our Strengths

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

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 25.1 million people and supply
water on a wholesale basis to an additional urban population of approximately 3.1 million people, including the population of Guarulhos. As of
December 31, 2018, 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 21.7 million people, achieving an effective sewage service ratio of 83% in respect of all regions in which we
operate as of December 31, 2018.  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 44.2 million as of December 31, 2018.  The
city of São Paulo had an estimated total population of 11.8 million  as  of  the  same  date,  while  the  São  Paulo  metropolitan  region  had  a  total
population of 20.9 million.  Based on its GDP, the state of São Paulo is the wealthiest state and has the largest economy of any state in Brazil. 
The GDP of the state of São Paulo was approximately R$2.0 trillion representing approximately 32.5% of Brazil’s total GDP, according to the
most recent data collected by the IBGE in 2016. 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, 2008 and December 31, 2018, we executed 30-year agreements with 307 of the
369 municipalities we serve, including an agreement with the city of São Paulo, in June 2010, and Santos in September 2015.  In December
2018,  we  entered  into  an  agreement  with  the  municipality  of  Guarulhos,  the  second  largest  municipality  in  the  State  of  São  Paulo  where  we
started  the  operation  in  January  2019,  with  a  population  of  1.3  million.  For  the  year  ended  December  31,  2018,  income  from  these  30-year
agreements accounted for 81.1% 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.

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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,  specifically  during  2015  to  2018,  we  implemented  a  series  of  short-term  and  medium-term
initiatives that improved the water security for the Metropolitan region of São Paulo.  For more information, see “Item 4.B. Business Overview
—The 2014-2015 Water Crisis” and “—Capital Expenditure Program”.

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  operations.    We  also  intend  to  increase  our  sewage  coverage  by  adding  1.2  million  sewage
connections by 2023. 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 the alignment of
management  processes  and  the  dissemination  of  best  practices  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. The first stage of Net@suite was implemented in August 2018 and we
expect to complete the implementation of the Net@ suite by 2020.

Through these projects we 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
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 for 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.

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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,  allowing  us  to  renew  all  or  substantially  all  of  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  on
aggregate represent a total population of approximately 16.7 million, including the population of Guarulhos and Aguaí.  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, 2018 accounted for 47.0% of our gross operating revenues (excluding
revenues  relating  to  the  construction  of  concession  infrastructure).  Between  January  1,  2007  and  December  31,  2018,  we  entered  into
agreements with 307 municipalities (including our services agreement with the city of São Paulo), of which twenty were entered into in 2018. 
These 307 municipalities accounted for 81.1% of our total revenues for the year ended December 31, 2018 and 80.2% of our intangible assets as
of the same date.  As of December 31, 2018, 35 of our concessions had expired and are currently being renegotiated.  These 35 municipalities
accounted for 6.1% of our total revenues for the year ended December 31, 2018 and 12.3% of our intangible assets as of the same date.  From
January 1, 2019 through 2030, 31 concession agreements, accounting for 6.3% of our revenues for the year ended December 31, 2018 and 5.3%
of our intangible assets as of the same date, will expire.

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, 2018 and plan to increase
this ratio to 93% by 2023 by adding over 1.2 million sewage connections and the indicator of consumer units connected to the sewage treatment
system from 76% to 84% by 2023.  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  16.7  million
(including the municipality of Guarulhos and Aguaí) 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 2018 we invested R$4.2 billion and between 2019 and 2023 we plan to invest an additional R$18.7 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 44.2 million as of December 31,
2018.  The city of São Paulo, capital of the state of São Paulo, had an estimated total population of 11.8 million, with a total population of 20.9
million  inhabitants  in  the  São  Paulo  metropolitan  region,  as  of  December  31,  2018.    The  São  Paulo  metropolitan  region  encompasses  39
municipalities and is the largest metropolitan region in the Americas and the fourth largest metropolitan region in the world, according to the
United  Nations’  Data  Booklet  “The  World’s  Cities  in  2018”,  with  approximately  47%  of  the  total  population  of  the  state  of  São  Paulo  as  of
December 31, 2018. According to the 2016, the most recent data collected by the IBGE, the GDP of the state of São Paulo was approximately
R$2.0 trillion, representing approximately 32.5% 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),  currently  Ministry  of
Economy (Ministério da Economia).

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  São  Paulo  Secretariat  for  Infrastructure  and  Environment
(Secretaria de Infraestrutura e Meio Ambiente do Estado de São Paulo). Additionally, a majority of the members of our board of directors and
our management are appointed by the State Government.

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 Infrastructure and Environment.  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.

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As  of  December  31,  2018,  we  provided  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 369 of the 645 municipalities in the State, including in the city of São Paulo. We
also supplied water on a wholesale basis to five municipalities in the São Paulo metropolitan region, including Guarulhos, in which we did not
operate water distribution systems, and four of these municipalities also utilize our sewage treatment services. In December 2018, we entered
into an agreement with the municipality of Guarulhos for the direct supply of water and sewage services. This operation began in January 2019.
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, State Supplementary 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 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. Due to elections for state government in the
second  half  of  2018,  this  operation  was  suspended,  and  we  are  currently  awaiting  guidance  from  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, or any other type of corporate reorganization, including a change of control. We cannot assure that any
potential corporate reorganization, including a change of control, will not have a material adverse effect on our business.

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, ombudsman, regulatory affairs, audit, compliance, risk management 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:

· 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, collection of revenues, allocating financial
resources to divisions of our company, conducting capital markets and other debt incurrence transactions and managing debt levels, controller,
accounting, costs and tariffs, corporate governance and investor relations;

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· 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 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 increased demand 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$18.7 billion from 2019 through 2023. We invested R$4.2 billion, R$3.4 billion and

R$3.9 billion in 2018, 2017 and 2016, 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 

2019

2020

Planned Capital Expenditures

2021
(in millions of reais)

2022

1,669
1,366

470

3,505

1,492
1,524

607

3,623

1,636
1,777

471

3,884

1,507
1,766

576

3,849

2023

Total

1,453
1,878

539

3,870

7,757  
8,311  
2,663  
18,731  

Our capital expenditure program from 2019 through 2023 will continue to focus on achieving our targets by making regular investments to
maintain and expand our infrastructure  and  to  reduce  water  losses  in  the  369  municipalities  we  served  as  of  December  31,  2018.  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 2019 due
to the priority given since 2014 to emergency investments in water.

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 2019 through 2023, we plan to spend R$7.7 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 we have nevertheless maintained our investment plans for the region. In
2018, we invested approximately R$165 million in the Metropolitan Water Program.

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Since 2000, the Metropolitan Water Program has increased the production capacity by 13.1 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,  2.1  m³/s  of  which  can  be  attributed  to  increased
production in the Guarapiranga System, concluded in 2015, and 6 m³/s due to the implementation of the new São Lourenço water supply system.

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 1.5 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  was  completed  in  April  2018  and
operations  began  in  July  2018.  In  May  2018,  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.

As  of  December  31,  2018,  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.

Interconnection of Jaguari and Atibainha Reservoirs

In  February  2016,  we  began  the  construction  work  on  the  interconnection  of  Jaguari  (part  of  the  Paraíba  do  Sul  Basin)  and  Atibainha
reservoirs (part of the PCJ River Basin, Cantareira System), which is a strategic and priority project to guarantee secure access to water for the
metropolitan region of São Paulo. This project was completed during March 2018, when we also began transferring 5.13 m³/s of water from the
first to the other.

Since May 2018, the transfer of water also works in the opposite direction, from the Atibainha reservoir to the Jaguari reservoir, enabling to

reverse up to 12.2 m3/s and optimize the reservation capacity of both reservoirs, while benefiting the population of the Paraíba Valley.

Reversal of the Itapanhaú River

The Itapanhaú River 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 reservoir, 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 20.9 million
people in the greater São Paulo region. In 2017, we finalized the bidding process that selected the consortium which will execute the project.
The investment will be of R$91.7 million and the start of works is conditional on obtaining the installation license expected for the second half
of 2019.

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$6.2  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 267 liters per connection per
day by 2021, which is equivalent to reducing the Water Metered Loss Index (based on measured consumption) from 34.1% in December 2008 to
28.5% in 2021.  In 2018, we invested approximately R$645.6 million in this program and our water loss measured 293 liters per connection per
day and our Water Metered Loss Index averaged 30.1%.

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.

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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, and in 2018, we started to enlarge the treatment capacity of the water treatment station Mambu Branco,
from 1.6m3/s to 3.2m3/s, which we estimate to conclude by 2021.

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).  The program is supported by funds from the Caixa Econômica Federal as well as
our own funds.  In 2018, we invested R$33.6 million in the Coastal Water Program.

Investments in Sewage—We have a series of ongoing and scheduled projects involving the collection, removal and treatment of sewage.  For
the period from 2019 through 2023, we plan to invest R$11.0 billion in sewage collection and treatment.  The main programs are:

Tietê Project

We have been working in the metropolitan region of São Paulo in sanitation programs that aim to contribute to the revitalization of rivers

and streams, and its main program is the Tietê Project.

Established in 1992, the project aims to contribute to the progressive revitalization of the Tietê river and its tributaries, in the Alto Tietê
basin, where the metropolitan region of São Paulo is located, through the expansion and optimization of the sewage collection, transportation
and treatment system.

Considering the complexity and challenges faced to implement infrastructure projects in crowded and disorderly urbanized areas such as

São Paulo, it was necessary to structure the project in stages. 

From  1992  to  the  end  of  2018,  the  investments  totaled  US$2.9  billion,  of  which  R$441.9  million  were  disbursed  in  2018.  Part  of  the
resources  allocated  to  the  program  are  our  own  capital  and  the  remainder  comes  from  financins  granted  by  the  Inter-American  Development
Bank - IDB, BNDES and Caixa Econômica Federal - CEF.

During  this  period,  1.77  million  domestic  sewage  connections  were  built  and  4.45  thousand  km  of  interceptors,  trunk  collectors  and
collection  networks  were  built  to  collect  and  transport  the  sewage  to  treatment  in  our  plants,  whose  installed  capacity  for  treatment  almost
tripled.

As a result, the treated sewage outflow at the metropolitan region of São Paulo increased from four thousand liters per second in 1992 to the
current 18.7 thousand liters per second. This increase, of 14.7 thousand liters per second, is equivalent to the sewage generated by approximately
ten  million  people.  As  a  result,  sewage  collection  that  served  70%  of  the  urbanized  area  of  the  metropolitan  region  of  São  Paulo  in  1992
increased to 87% by the end of 2018. Sewage treatment increased from 24% to 70% of the volume collected.

The program aims to increase by 2024 the coverage rate with the sewage network in the metropolitan region of São Paulo to 92% and the
treatment index to 90% of the total collected, with the conclusion of the third stage, now under way with a 70% progress, and the works already
planned for the fourth stage, with priority interventions currently in concurrent execution.

In  2018,  the  completion  of  the  second  phase  of  the  expansion  of  Sewage  Tratment  Plant  Barueri,  the  largest  treatment  plant  in  South

America, allowed us to increase from 12 thousand liters per second (reached in 2017) to 16 thousand liters per second currently.

It is also worth mentioning the implementation of the ITi-7 sewage interceptor under the Marginal Tietê, a highway that runs through the
city of São Paulo along with the Tietê River, expected to be completed by the beginning of 2020, benefiting approximately 2 million people
living in the central and southern regions of the city of São Paulo, highly verticalized, with collector piping operating close to its limit.

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.

Since 2007, 151 urban streams have been decontaminated, benefiting approximately 2.5 million people.  In 2018, we invested R$9 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.

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In  2018,  through  certain  actions  for  the  regularization  of  the  sewage  systems  through  the  Clean  Stream  Program,  complementary  to  the
Tietê Project, we were able to clean up an extensive stream in the city of São Paulo, named Traição, benefiting more than 210 thousand people,
in  addition  to  the  advances  in  sanitation  works  in  sub-basins  of  the  streams  in  conclusive  phases.  Throughout  the  year,  we  also  continue  to
inspect and monitor the water quality of previously decontaminated streams.

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 the
objectives for 2019 are under discussion.

Clean Wave Program

The Clean Wave Program (Programa Onda Limpa) is the largest environmental sanitation program on the Brazilian coast. Its main goal is
to  improve  and  expand  the  sewage  systems  in  the  municipalities  that  cover  the  metropolitan  region  of  Baixada  Santista,  seeking  the
universalization  of  sewage  services  in  the  region.  The  program  will  improve  the  condition  of  82  beaches  and  will  benefit  approximately  4
million people, including locals and tourists who visit the coast, especially in the summer months.

Due  to  the  complexity  and  challenges  involved  in  the  implementation  of  infrastructure  projects  in  coastal  regions,  the  Program  was
structured in stages. In the first phase, started in 2007, 1,263 km of sewage collection networks, 4.5 km of submarine emissaries, two sewage
pre-conditioning stations, seven sewage treatment stations and approximately 110 thousand sewage connections were implemented, resulting in
the  increase  of  the  collected  sewage  index  from  53%  to  81%  in  2018,  reaching  100%  treatment  of  the  sewage  collected.  We  invested  R$1.9
billion in this phase, with our own resources and financing from JICA and BNDES.

The second phase of the Program began in 2018 and aims to implement two sewage preconditioning stations, each with a treatment capacity
of 1.4 m3/s of sewage and replacing the diffuser sections of two submarine emissaries in the city of Praia Grande. This stage also includes the
implementation of approximately 450 km of collecting networks, 48 thousand new connections, three new sewage treatment plants and eleven
additions  and  improvements  to  existing  sewage  treatment  plants.  We  expect  to  complete  this  step  in  2025,  with  92%  sewage  collection  and
maintenance of sewage treatment index collected.

The  third  stage  of  the  Program  is  under  planning,  with  execution  estimated  between  2025  and  2030,  and  a  forecast  of  95%  sewage

collection and treatment of all sewage collected.

Other Policies and Programs

Nossa Guarapiranga

The  Nossa  Guarapiranga  Project  launched  in  December  2011  is  still  running.  Its  main  objective  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 reservoir and indirectly serves a further three million people who consume the water from this water 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 2018, we removed an average of 200 m³/month of solid residue and approximately 1,370 m3/month of water plants 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  2018,  we  completed  approximately  25.5  thousand sewage  connections  under  the  Pró-
Conexão program. 

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.

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B.      Business Overview

Our Operations

As  of  December  31,  2018,  we  provided  water  and  sewage  services  to  369  municipalities  in  the  state  of  São  Paulo  under  concession
agreements,  program  agreements,  other  forms  of  legal  arrangements  or  without  formal  agreements.  We  also  supplied  treated  water  on  a
wholesale basis to five municipalities located in the São Paulo metropolitan region and urban conurbations, including Guarulhos.  The majority
of these concessions have 30‑year terms. Due to court orders, we temporarily suspended our services in two other municipalities (Cajobi and
Macatuba).  For  more  information,  see  “Item  8.A.  Financial  Statements  and  Other  Financial  Information—Legal  Proceedings”.  Between
January 1, 2007 and December 31, 2018, we entered into agreements with 307 municipalities (including our services agreement with the city of
São  Paulo)  in  accordance  with  the  Basic  Sanitation  Law,  of  which  twenty  were  entered  into  in  2018.    As  of  December  31,  2018,  these  307
municipalities  accounted  for  81.1%  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, 2018, 35 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, 2019 through 2030, 31 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 26 to our financial statements as of and for the year
ended December 31, 2018.

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, as 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,  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. 

Wholesale Operations

Wholesale Water Services

Until the end of 2018, we provided 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). However, in December 2018 we entered into an agreement with the
municipality of Guarulhos to provide water and sewage services on a retail basis as from January 2019, replacing water services on a wholesale
basis.  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 No. 11.445/2007. In 2018, the revenues from wholesales water services were R$1,117.4 million (including the amount of
R$928.0  million  related  to  agreement  with  the  municipality  of  Guarulhos.  For  more  information  on  this  agreement,  see  Note  9  to  our  2018
financial statements).

The Brazilian courts could oblige 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 and Mauá still 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 and Mauá, in
2015 and 2016, respectively, seeking to resolve the outstanding amounts and restore normal commercial relations with them but the negotiations
were not successful. Accordingly, we signed a new Protocol of Intentions with the municipality of Santo André in March 2019.

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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  2018  we  invoiced  approximately  31.1  million  cubic  meters  of  sewage  collected  from  these
municipalities.  We  believe  this  illustrates  our  commitment  to  social  and  environmental  responsibility.  In  2018,  our  revenues  from  wholesale
sewage services were R$46.9 million.

In  December  2018,  we  entered  into  an  agreement  with  the  municipality  of  Guarulhos  to  direct  supply  water  and  sewage  services  to  the
municipality  for  40  years.    The  municipality  of  Guarulhos  holds  a  PPP  contract  entitled  part  of  the  sewage  services  and  we  hold  an
interdependent contract with the SPE that holds the PPP contract. We are responsible for all commercial and billing services.

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  2018,  we  produced  approximately  2,799.7 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 69.1% of water invoiced by volume in 2018.

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 

2018

Year ended December 31,

2017
(in millions of cubic meters)

2016

1,959.6
840.1
2,799.7

1,194.5
262.7
650.7
2.107,9

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

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.

Water Resources

We can withdraw water only to the extent permitted by DAEE pursuant to water rights 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 withdraw substantially all of our water supply from surface sources from rivers and reservoirs, with a
small portion being withdrawn 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”.

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In order to supply water to the São Paulo metropolitan region, we rely on 20 reservoirs of non‑treated water and 231 reservoirs of treated
water, which are located in the areas under the influence of the nine water producing systems (including the São Lourenço water supply system)
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 82.1 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 80.9 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 60.9 m³/s during 2018.  The Cantareira, Guarapiranga and Alto
Tietê systems produce 82% of the water we distributed in the São Paulo metropolitan region in 2018.

In March 2018, we began operations of one of the important projects 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 has 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 and operations began in July 2018. 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  2018,  the  Cantareira  system  accounted  for  39%  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 72.2% 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 (2)
Ribeirão da Estiva
São Lourenço
Total

Production Rate(1)

2018

2017

2016

(in cubic meters per second)

23.9
13.4
12.9
3.4
4.3
1.1
0.2
0.1
1.6
60.9

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

(1)     Average of the twelve months ended December 31, 2018, 2017 and 2016.
(2)   At the beginning of 2018, the region served by the Baixo Cotia system began to be supplied by the São Lourenço system.

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  199.1,  207.3  and  200.2  thousand  new  water  connections  in  2018,  2017  and  2016,
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,  including  Guarulhos,  whereas
distribution is the responsibility of other companies or departments related to each municipality.

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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$18.7 billion from
2019 to 2023 to increase our water production and distribution capacities as well as to improve the water supply systems.  In 2018, our total
investment in water supply systems amounted to R$2.3 billion, of which R$2.0 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  247  treatment
facilities,  of  which  nine  are  a  part  of  the  Metropolitan  Production  System—located  in  the  São  Paulo  metropolitan  region  and  account  for
approximately  70.0%  of  all  water  we  produced  in  2018.    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 withdrawn from groundwater sources.  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)

2018
75,519
9,053

As of December 31,
2017
74,396
8,863

2016
73,015
8,654

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,  2018,  our  water  distribution  pipes  and  water  transmission  lines  included:  (i)  38,858  kilometers  in  the  São  Paulo

metropolitan region; and (ii) 36,661 kilometers in the Regional Systems.

As of that date, we had 375 storage tanks in the São Paulo metropolitan region with a total capacity of 2.3 million cubic meters, and 2,056
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.

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 

in thousands

2019
124
62
186

2020
127
65
192

2021
127
65
192

2022
127
65
192

2023
127
65
192

2019 – 2023
632
322
954

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Water Loss

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 =

WMLI =

TLDC  = 

Vproduced (Vinvoiced + Vused)
Vproduced

Vproduced – (Vmeasured + Vused)
Vproduced

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

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,  2018,  we  experienced  337  liter/connection  per  day  of  water  loss  in  the  São  Paulo
metropolitan  region  and  226  liter/connection  per  day  of  water  loss  in  the  Regional  Systems,  averaging  293  liter/connection  of  water  loss  per
day. We have a Corporate Program for Reduction of Water Loss in place that aims to reduce total water loss to around 267 liters/connection per
day, and the Water Metered Loss Index to 28.5% by 2021.

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) fell from
22.2% in December 2008 to 19.9% in December 2018.

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For more information on the measure we have adopted to confront the water crisis, see “—The 2014-2015 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, increase anti-fraud actions 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;

· 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  Inductively  Coupled  Plasma
(ICP).  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. We also participate in the Clean Stream Program to clean important streams in the city

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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—Clean  Stream  Program”,  and  “—
Other Policies and Programs—Nossa Guarapiranga”.

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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. 

Sewage Operations

We  are  responsible  for  the  collection,  removal,  treatment  and  final  disposal  of  sewage.    As  of  December  31,  2018,  we  collected
approximately 82% 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 2018, we collected approximately 83% of all the sewage produced in the municipalities in which we
operated in the state of São Paulo. We installed 215.3 thousand, 221.8 thousand and 236.6 thousand new sewage connections in 2018, 2017 and
2016, 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, 2018,
we  were  responsible  for  the  operation  and  maintenance  of  51,788  kilometers  of  sewage  lines,  of  which  approximately  27,036  kilometers  are
located in the São Paulo metropolitan region and 24,752 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)

2018
51,788
7,495

As of December 31,
2017
50,991
7,302

2016
50,097
7,091

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 it 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 São Paulo Environmental Company (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 Law No. 997/1976 regulated 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 80% as of December 31, 2018.

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

2019

2020

2021

2022
in thousands

2023

2019‑2023

147
80
227

154
86
240

154
92
246

155
92
247

155
85
240

765
435
1,200

In  2018,  approximately  64%  and  99%  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 76% 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 where we
operate, we are making efforts to reach this goal.

We currently operate nine ocean outfalls and 556 sewage treatment facilities, of which the five largest, located in the São Paulo metropolitan

region, have a treatment capacity of approximately 24.5 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 489 secondary treatment facilities in the interior region of São Paulo State that have
treatment capacity of approximately 16.9 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 43 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, regulated by 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 authorized to receive it.  In turn, we treat the leachate generated

in these landfills. 

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. 

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Additionally, using financing from Funding Authority for 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, 2018, we operated water and sewage systems in 369 of the 645 municipalities in the state of São Paulo.  In addition, we
supplied  water  on  a  wholesale  basis  to  five  municipalities  located  in  the  São  Paulo  metropolitan  region,  including  Guarulhos,  with  a  total
population of approximately 3.1 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

2018

Year ended December 31,
2017
(in millions of R$)

2016

10,295.5
3,958.1
14,253.6

8,636.9
3,586.8
12,223.7

7,749.7
3,372.5
11,122.2

In 2018, there were 276 municipalities operating their own water and sewage systems with a total population of approximately 16.7 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 2018 with 482 formal contracts and ended the year with
531  contracts.  For  more  information  about  the  water  crisis,  see  “—The  2014-2015  Water  Crisis”.    For  more  information  on  Take-or-pay
Contracts see “—Tariff Structure—Fixed Demand Agreements (Take-or Pay)”.

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$1.34  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 2018, 2017 and 2016, we received payment of 93.8%, 94.1% and 93.0%, respectively, of the amount billed to
our retail customers, and 93.8%, 94.1% and 93.0%, respectively, of the amount billed to those customers other than State entities, within 30 days
after the due date.  In 2018, 2017 and 2016, we received 99.4%, 99.2% and 97.2%, respectively, of the amount billed to the State entities. With
respect  to  wholesale  supply,  in  2018,  2017  and  2016,  we  received  payment  of  38.5%,  60.1%  and  74.1%,  respectively,  of  the  amount  billed
within 30 days.

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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 take
place in April.

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 Supplementary Law No. 1,025/2007, that 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 were ratified by Federal Law No. 11,445/2007 and regulated by resolutions issued by ARSESP.

In regard 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, however, reserved 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  four
municipalities (Piracaia, Mombuca, Santa Maria da Serra and Aguas de São Pedro). In 2016 we obtained a definitive favorable decision in the
Piracaia proceeding and in 2018, we obtained a definitive favorable decision in the Mombuca and Santa Maria da Serra proceedings. However,
as the debate continues in the Aguas de São Pedro proceeding, we cannot predict the outcome of this case or how it may affect 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”.

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 linear tariff adjustment increase of

3.1451% for tariffs beginning December 11, 2013. 

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In April 2014, ARSESP issued Resolution No. 484/2014 (further ratified by ARSESP Resolution No. 520/2014). Considering the provisions
of  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.

Taking into account the unusual situation in our industry as a result of the lack of rainfall and our measures to encourage water savings in

order to ensure supply, we had to implement a series of measures, including the following:

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.

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

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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 

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) for us, 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 to 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 company 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  was  not
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%, effective on November 10,2017.

On  November  10,  2017,  ARSESP  authorized  us  to  charge  our  customers  for  the  Regulatory,  Control  and  Inspection  Fee  (Taxa  de
Regulação, Controle e Fiscalização, or TRCF) by 0.5% including it 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  Supplementary  Law  No.
1.025/2007.

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, ARSESP released, on May 9, 2018, Final Technical Note
NT/F/0006/2018 and Resolution No. 794/2018, establishing a final regulatory asset base of R$39 billion, a WACC of 8.11%, an X Factor of
0.8885%, a P0 of R$3.7702/m³ and a tariff repositioning index of 3.5070% effective on June 9, 2018.

On May 24, 2018, as a result of the final result of the Second Ordinary Tariff Revision, we filed: (i) an administrative appeal questioning the
methodology utilized for applying the compensatory adjustment to revenue, electricity costs and investments made during the first tariff cycle;
(ii) a request for clarification of the reasons leading to a significant reduction in OPEX projections for the period 2017-2020; (iii) a request to
review estimates for the X Factor calculations of the compensatory adjustment for the delay in the application of the Second Ordinary Tariff
Review; and (iv) a request to review the calculation of the financial component related to municipal funds, this one related to the contract with
the municipality of São Paulo.

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On  February  28,  2019,  ARSESP  published  the  result  of  the  applications  filed  on  May  24,  2018  (described  above).    With  regard  to  the
administrative appeal, ARSESP decided not to accept its merits. Regarding the request for clarification and estimate review; ARSESP partially
accepted  our  arguments  and  determined:  (i)  the  correction  of  the  X  factor,  reducing  it  from  0.8885%  to  0.6920%;  and  (ii)  to  apply  a
compensatory adjustment of 0.8408% to the upcoming tariff adjustment to cover: a) the delay in the application of the Tariff Revision in the
second cycle, specifically related to the capitalization of revenue differences after June 2018; and b) an adjustment in the reference price dates
adopted in the OPEX calculation, from December 2017 to April 2017. The final results of an index of 0,8408%, to be applied at the same time as
the annual tariff adjustment in May 2019.

On  April  10,  2019,  ARSESP  issued  Resolution  No.  859/2019  which  authorizes  us  to  implement  a  tariff  readjustment  of  4.7242%  to  the
current  tariffs,  comprised  of:  (i)  IPCA  variation  in  the  period  of  4.5754%  effective  (ii)  efficiency  factor  (X  Factor)  of  0.6920%;  and  (iii)
Compensatory adjustment of 0.8408%.  This tariff readjustment will be effective on May 11, 2019.

Regulatory Agenda

On November 1, 2018, ARSESP opened public consultation No. 09/2018 with the objective of collecting contributions and opinions related
to  the  proposal  of  the  Regulatory  Agenda  ARSESP  2019-2020.  The  purpose  of  this  Regulatory  Agenda  is  to  ensure  transparency  and
participation by the society in the regulatory process and to give users of regulated public services, economic agents and other interested parties
the opportunity to express their opinion, as well as to obtain subsidies that may provide a greater degree of reliability, clarity and security to the
agency’s decision-making process. On January 31, 2019, ARSESP announced the result of this public consultation (No. 09/2018) and among the
subjects that were discussed are the regulatory criteria for the recognition as part of the tariffs of the transfers made to all municipal funds for
environmental sanitation and infrastructure, expected to be concluded in the first half of 2019.

On  February  8,  2019,  ARSESP  published  the  Public  Consultation  No.  02/2019,  which  aims  to  obtain  contributions  on  the  Regulatory
Criteria for the recognition of the tariffs for the transfers to municipal funds for environmental sanitation and infrastructure. Our contributions to
this Public Consultation were forwarded on March 11, 2019.

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. Following this revision cycle, ARSESP
will  pass-through  to  the  tariffs  up  to  4%  of  the  municipal  revenue  that  is  transferred  by  us  to  a  legally  established  municipal
infrastructure fund. Our only contract that provides for this and complies with ARSESP´s requirements is with the municipality of São
Paulo  and,  accordingly,  today  4%  of  the  funds  transferred  to  the  São  Paulo  Municipal  Fund  for  Environmental  Sanitation  and
Infrastructure are being passed through to our tariffs.

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·      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.  On  February  28,  2019,  ARSESP  rejected  our
reconsideration  request  and  maintained  their  original  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).”

·      Considering the final results of the Second Ordinary Tariff Revision released on May 9, 2018, in the current tariff cycle (2017-2020)

this 7.5% charge will not be passed in full through to customers.

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

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  the  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.

However, in the Public Consultation No. 09/2018, one of the topics included in the Regulatory Agenda 2019-2020 proposed by ARSESP is
the preparation of studies and proposals for a review of our tariff structure and respective implementation plan. This subject is expected to be
concluded in the first half of 2020.

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 thousand 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 thousand cubic meters per month to 3 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  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 2018 with 482 formal contracts and ended the year with 531 contracts.  For more information about the water
crisis, see “—The 2014-2015 Water Crisis”.

On  November  2,  2018,  ARSESP  published  Resolution  No.  818/2018  which  provides  the  criteria  for  the  execution  and  inspection  of
contracts for the supply of water and sewage services for large users of non-residential use categories, governing the conclusion of new contracts
and adjusting existing contracts to the new rules.

The ARSESP Resolution No. 818/2018 consolidates all the regulatory guidelines for the execution of contracts with large users, as well as
establishing a system for the homologation of standard contracts setting out the transition rules for contracts already in force and determines the
minimum and maximum limits for the fees that may be charged.  Additionally, this resolution allows ARSESP to amend such contracts, in case
of a restriction of the water supply, and require mandatory disclosure of the contracts, as well as the results of their inspections, on the website of
the provider.

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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,  depending  upon  whether  a  customer  is  located  in  the  São  Paulo
metropolitan region or the 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. In 2018, 2017 and 2016, the average tariff
calculated  for  the  Regional  Systems  was  approximately  25%  below  the  average  tariff  of  the  São  Paulo  metropolitan  region.  Considering  the
current tariff  structure this is also expected for 2019.

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:

Customer Category Consumption

As of May 11,

As of June 9,

As of Nov 10,

As of May 12,

Residential

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

2019

2018

2017

(reais per m3)

2.62

4.10

10.23

11.27

0.89

1.53

5.43

7.74

8.55

0.68

0.77

2.56

7.74

8.55

5.26

10.23

19.60

20.42

2.63

5.11

9.84

10.22

3.94

7.66

14.74

15.32

2.50

3.91

9.77

10.76

0.85

1.46

5.19

7.39

8.17

0.65

0.73

2.44

7.39

8.17

50.20

9.77

18.71

19.50

2.51

4.88

9.40

9.76

3.76

7.32

14.08

14.63

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

2016

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

(1)        

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

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.

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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.

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On  November  10,  2017,  ARSESP  authorized  us  to  charge  our  customers  for  the  Regulatory,  Control  and  Inspection  Fee  (Taxa  de
Regulação, Controle e Fiscalização, or TRCF) by 0.5% including it 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  Supplementary  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 on June 9, 2018.

On  April  10,  2019,  ARSESP  issued  Resolution  No.  859/2019  which  authorizes  us  to  implement  a  tariff  readjustment  of  4.7242%  to  the
current  tariffs,  comprised  of:  (i)  IPCA  variation  in  the  period  of  4.5754%  effective  (ii)  efficiency  factor  (X  Factor)  of  0.6920%;  and  (iii)
Compensatory adjustment of 0.8408%.  This tariff readjustment will be effective on May 11, 2019.

Government Regulations Applicable to our Contracts

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

The National Plan of Basic Sanitation (Plano Nacional de Saneamento Básico), or “PLANASA” was created in 1971, aiming to provide
universal access to sanitation services in urban areas and to establish an adequate tariff policy, among other things. Afterwards, 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 program contract 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 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. 

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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:

·        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.

On December 28, 2018, Provisional Measure No. 868/2018 was issued with the same purpose of Provisional Measure No. 844/2018, which
aims to amend the Basic Sanitation Law No. 11,445/2017; Law No. 9,984/2000, to attribute to the National Water Agency the power to enact
national reference rules about the sanitation service; Law No. 10,768/2003 to change the role of the Water Resources Specialist; and Law No.
13,529/2017  to  authorize  the  Federal  Government  to  participate  in  the  fund  with  the  exclusive  purpose  to  provide  financial  support  for
specialized  technical  services.  This  Provisional  Measure  is  valid  until  June  3,  2019  and  its  conversion  into  law  is  pending  approval  by  the
National Congress. Although this Provisional Measure has been in force since the date of its publication, it is not yet possible to predict how it
will impact contracts that we may enter into while the measure is in force.

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  State  Supplementary  Law,  or
“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),  Sorocaba  No.  (LCE  No.  1,241/2014)  and  Ribeirão  Preto  (LCE
1,290/2016), and the urban clusters of Jundiaí (LCE No. 1,146/2011), Piracicaba (LCE No. 1,178/2012) and and Franca (LCE No. 1,323/2018).

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 (State Supplementary Law 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.

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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, whose effects may impact other ongoing legal proceedings. 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, 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,  which  was  subsequently  converted  into  Federal  Law  No.  13,683/2018  and  by  Provisional  Measure  No.  862  of
December 4, 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  Infrastructure  and  Environment.    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 State 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 Infrastructure and Environment 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. 

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.

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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

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

The  implementation  of  these  and  other  more  recent  rules  will  particularly  impact  our  commercial  and  operational  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.

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
operational processes, and may adversely affect us in ways we cannot currently predict.

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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.

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. In the municipalities included in metropolitan regions, urban agglomerations and
microregions, the State of São Paulo is also included as a party. 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”.

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  agreements  in  cases  involving  the  early
resumption of services by the concession authority.

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As of December 31, 2018, we provided water and sewage services to 369 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, 2018,
we entered into agreements with 307 municipalities (including our services agreement with the city of São Paulo) in accordance with the Basic
Sanitation Law, of which twenty were entered into in 2018.  As of December 31, 2018, these 307 municipalities accounted for 81.1% 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,  2018,  35  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 December 30, 2019 through 2030, 31 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. 

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, 2018. 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  to  date  no
agreement was entered into to supply water to those neighborhoods.

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  State  Supplementary  Law,  or
“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),  Sorocaba  No.  (LCE  No.  1,241/2014)  and  Ribeirão  Preto  (LCE
1,290/2016), and the urban clusters of Jundiaí (LCE No. 1,146/2011), Piracicaba (LCE No. 1,178/2012) and Franca (LCE No. 1,323/2018).

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,  which  was  subsequently  converted  into  Federal  Law  No.  13,683/2018  and  by  Provisional  Measure  No.  862  of
December  4,  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.  However, this provision was repealed by Federal Law
No. 1,368/2000.

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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 72.2% of our gross operating revenue from services in 2018.

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 the decree No. 41,446/1996, which updated the existing tariff system
and  allowed  us  to  continue  to  set  our  own  tariffs.    Our  tariffs  are  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.  Except
for the responsibility for planning, the remaining activities may 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  four  municipalities  (Piracaia,  Mombuca,  Santa  Maria  da  Serra  and  Aguas  de  São  Pedro).    In  2016  we
obtained a definitive favorable decision in the Piracaia proceeding and in 2018, we obtained a definitive favorable decision in the Mombuca and
Santa Maria da Serra proceedings.  However, as the debate continues in the Aguas de São Pedro proceeding, we cannot predict the outcome of
this  case  or  how  it  may  affect  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 2014-2015 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 levels and water levels in
the reservoirs that provide water to the São Paulo metropolitan region, our largest market, increased. With the return of rainfall to 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.  As  of  December  31,  2018,  the  reservoirs  in  the  São  Paulo
metropolitan  region  contained  943.3  million  m3  of  water  storage  for  treatment  (including  the  São  Lourenço  System  –  a  new  supply  system
which expands our production capacity by 6 m3/s, and which commenced operations in July 2018), compared to 916.8 million m3 available for
treatment as of December 31, 2017 not including the technical reserve of 287.5 million m³. The average monthly water production in 2018 for
the São Paulo metropolitan region was 60.9 cubic meters per second, or m³/s, compared to 60.6 m³/s in 2017 and 58.5 m³/s in 2016.

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 6.8 million people, with an annual average water production of up to 23.9 m³/s in 2018 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 Nos. 926/2017 and 925/2017, both dated May 29, 2017. See “Item 3.D.
Risk Factors—Risks Relating to Our Business”.

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 rainfall to its historical average, the measures taken during the
water crisis to continue services to consumers were gradually discontinued. 

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, 2015-
2016, 2016-2017 and 2017-2018 hydrological year; and (iv) inflow during the 2018-2019 hydrological year (through March 2019):

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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

2018/19

30.0
14.0
17.5
25.1
5.2
14.8
24.2
13.7
30.9

34.4
14.0
26.0
22.1
8.8
27.1
29.5
23.0
33.0

52.1
21.8
31.5
22.5
16.0
52.3
30.2
18.8
40.8

69.4
26.9
26.9
15.4
11.5
73.8
76.0
57.4
41.5

72.3
27.6
34.5
10.5
40.7
49.6
36.4
35.8
43.5

(in m³/s)

65.9
28.1
29.8
18.9
42.6
69.8
36.9
33.2
56.2  

47.3
24.7
34.6
17.2
18.1
24.1
24.3
17.5

37.7
19.9
23.8
10.1
14.0
25.0
33.8
13.7

35.0
16.5
20.7
10.0
16.2
62.9
22.6
20.1

28.2
13.9
17.6
6.4
11.3
19.4
13.9
15.6

24.0
12.0
16.3
8.2
5.8
19.3
14.9
20.1

25.0
11.8
16.2
9.0
18.3
14.9
9.0
17.9

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  withdraw  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 withdraw up to 33 m3/s; (ii)
if  the  volume  of  water  is  between  40%  and  60%  of  the  reservoirs’  capacity,  we  can  withdraw  up  to  31  m3/s;  (iii)  if  the  volume  of  water  is
between 30% and 40% of the reservoirs’ capacity, we can withdraw up to 27 m3/s; (iv) if the volume of water is between 20% and 30% of the
reservoirs’ capacity, we can withdraw up to 23 m3/s; and (v) if the volume of water available is lower than 20% of the reservoirs’ capacity, we
can withdraw up to 15.5 m3/s.

As of December 31, 2018, the reservoirs in the São Paulo metropolitan region, where our largest market is located, contained 943.3 million
m3 of water storage for treatment, compared to 916.8 million m3 (including the São Lourenço System – a new supply system with 59.0 million
m3) available for treatment as of December 31, 2017. 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  March  2016,

December 2016, March 2017, December 2017, March 2018, December 2018 and March 2019 at the end of the rainy season:

March 2019

December
2018

March 2018

December
2017

March 2017

December
2016

March 2016 Total Storage Capacity

For the month

Cantareira
Guarapiranga
Rio Grande
Rio Claro
Alto Tietê
Cotia
 São Lourenço

542.4
155.8
113.1
13.9
511.9
16.8
87.3

387.8
103.3
92.4
10.9
282.6
7.1
59.1

532.3
141.4
97.2
13.9
362.8
15.2
 -

405.2
101.6
92.2
10.1
294.8
12.9
- 

931.9
135.4
98.9
13.9
314.6
16.4
- 

740.1
123.6
99.3
11.3
248.1
16.2
- 

641.9
150.0
108.4
14.0
247.9
16.5
- 

1,269.5(1)(2)
171.2
112.2
13.7
573.8
16.5
-

(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:

·         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.

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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 2018-March 2019
rainy season were at the historical average, when taking into account the accumulated volume, the completion of the São Lourenço Project and
the Jaguarí-Atibainha interconnection, a greater capacity of water transfer between the water producing systems, and the lower level of water
production  due  a  lower  average  water  consumption  by  the  population,  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 in the future.

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, 2018, the
Guarapiranga System served a population of 4.6 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,  2018,  the  Cantareira  System  served  6.8  million  people,  compared  to  8.9
million people before the drought in February 2014. 

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. 

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.

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On March 24, 2016, with the return of rainfall to historical levels 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.

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.

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 2014-2015 Water Crisis, 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  parts  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, starting in December 2015 we returned to the normal pre-crisis

policy of reducing pressure only at night. 

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.

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:

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·  

·  

·  

·  

·  

·  

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.  In 2017, we finalized the bidding process that selected the consortium that will execute
the project. The investment will be of R$91.7 million and the start of works is conditional on obtaining the installation license expected for
the second half of 2019.

Implementation of the São Lourenço Production System – this project was commenced in April 2014 and was completed in April 2018
and operations began in July 2018.  This system has an average water treatment capacity of 6.0 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’s  main  purposes  were  exchanging  information  and  planning  joint  actions  between  its  members  in  relation  to

anydrought affecting regions in the state.  However, due to the end of the water crisis, this committee is not operating anymore.

Marketing Channels

As of December 31, 2018, we were the concessionaire for the provision of water supply and collection, treatment and disposal of sewage
services  directly  to  end  consumers  for  369  municipalities  in  the  state  of  São  Paulo.    We  also  supplied  water  on  a  wholesale  basis  to  five
municipalities  located  in  the  São  Paulo  metropolitan  region,  including  Guarulhos.    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, 2018, we used approximately 1.9% 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  2018,  we
purchased  approximately  55%  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$183 million
in 2018, 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, 2018, we had paid a
total aggregate amount of R$5.0 million in premiums.  In addition, we paid R$1.6 million for a D&O insurance policy, covering R$3.1 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”,  “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”,  “Programa  Água  Legal  Sabesp”,
“Signos Sistema de Informação Geográfica no Saneamento Sabesp”, “Sistema de Suporte a Decisões Sabesp” 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:  “Acertando  suas  contas  com  a  Sabesp”,
“Fertilizante  Sabesfértil  Sabesp”,  “Pitch  Sabesp”,  “Novos  Negócios  Sabesp”,  “Centrais  de  Geração,  Hidrelétrica  Sabesp”,  “Biogás  Sabesp”,
“Energia  Fotovoltaica  Sabesp”,  “Energia  Eólica  Sabesp”,  “Resíduos  Sólidos  Urbanos  Sabesp”,  “Fertilizantes  Sabesp”,  “Tocha  de  Plasma
Sabesp”,  “Serviços  Técnicos  Sabesp”,  “Afinidades  Sabesp”,  “Fibra  Ótica  nas  Redes  Sabesp”,  “Geosabesp  Sabesp”,  “Serviços  Imobiliários
Sabesp”, “Waste To Energy Sabesp”, “Esgoto não Doméstico Sabesp” and “Redução de Perdas 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;

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

·        a box for installation of water meters.

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  engineering  journal”,    “Dashboard  panel”,  “COP”  (Online  Control  of  Water
Losses),  “GEL”  (Power  Management  System),  “CADGEO”,  “LIGGEO”,  “Intellectual  Property  Management  System”,  “SOE”  (Business
Organization  System),  “Application  for  Predicting  the  Concentration  of  Cyanobacteria  through  Artificial  Intelligence”  and  “Sabesp  Decision
Support System - SSD.”

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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 Research Foundation (Fundação de Amparo à Pesquisa do Estado de São Paulo
– FAPESP) and the Federal University of São Paulo – UNIFESP.

·        “Sabesp Decision Support System - SSD” is a software that contains graphic interfaces for updating data, queries of information in the
form of graphs and tables, regarding the operation of water-producing systems and dissemination of data to society through newsletters
generated by the system.

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  have  an  Environmental  Corporate
Management Department and Environmental Management Teams allocated in our business units. Our environment management is based in two
pillars of action: (i) environmental compliance and (ii) change of 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.

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We have the following ongoing environmental management programs:

·  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 11 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  strengthening  the  effectiveness  of  our  sanitation  activities,
which  propitiates  connections  with  the  communities  we  service  through  over  several  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) preparation and review 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.
  Since  2015,  we  have  been  working  on  the  EMS  with  a  mixed  model,  whereby  the  ISO  14001  standard  is  applied  to  a  limited  number  of
certified  plants,  while  the  other  stations  adopt  their  own  environmental  management  model  (named  SGA-SABESP),  without  aiming
certification. The EMS is currently in place in 271 treatment plants, 35 of which are ISO 14001 certified.  We expect to implement the EMS in
all stations by 2024, which may expand the scope of ISO 14001 certifications according to the strategy of the Business Units; and

implementation of the Regularization of the Terms of Commitment for Environmental Recovery Corporate Program, based on obligations of
forest  restoration  with  environmental  compensation  purposes,  when  necessary,  for  the  environmental  licensing  of  new  enterprises.  This
program includes the planting and maintenance of 1 million seedlings of native species in the period of ten years, in order to deal with current
obligations, as well as to new environmental compensations for the implementation of new projects. The action is part of the Springs Program
(Programa Nascentes) created by the Government of the State of São Paulo. Currently 416 thousand seedlings have been planted and are
being  maintained  in  the  Cantareira  System,  in  the  surroundings  of  the  Cachoeira  Reservoir,  additionaly  to  other  58  thousand  in  the
municipality of Igaratá, located in Paraíba Valley. The planting and maintenance of other 150 thousand more seedlings around Cachoeira
Reservoir and 110 thousand more in the municipality of Mirante do Paranapanema have all been contracted.

In addition to corporate environmental management initiatives, we have several projects and initiatives underway to benefit the environment

by engaging the population at large.

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.

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 have a Corporate Greenhouse Gas Management Program, aimed at reducing the
amount of greenhouse gases released into the atmosphere, including the awareness of climate change and the preparation of annual inventories.

In  2018,  we  concluded  the  corporate  inventory  of  greenhouse  gases  for  2017,  thus  totaling  11  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 89.3% of total greenhouse gas release.  Electric energy represents approximately
9.1% and other activities represent approximately 1.6%.

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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, among other technological resources to reduce the amount of
sludge disposed in landfills.  We also have initiatives to reduce our emission of greenhouse gases, such as the coverage of stabilization ponds
and drying of sludge by solar irradiation and the processing of biogas for vehicular use.

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. 

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:

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·         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. These requirements were implemented 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

·         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 to comply with current regulations. There are requests to obtain grants under
analysis by DAEE and ANA.

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 2018, we paid approximately R$78.7 million for the use of water resources.

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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 and Médio Tietê, Baixo 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.  In  2018,  the  charge  of  the  Turvo  Grande/Médio  Paranapanema/Pontal  do  Paranapanema  committees  was  implemented,  and  the
implementation of the charge in the Litoral Norte, São José dos Dourados e Alto Paranapanema river basins is expected for 2019.

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

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, as amended
by State Decree No. 62,973/2017 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;  Supplementary  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.

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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”.

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”.

Lending Limits of Brazilian Financial Institutions

CMN Resolution No. 4,589/17 dated as of June 29, 2017, which replaced 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 the state of 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, 2018, we operated through 75,519 kilometers of water pipes and water transmission
lines and 51,788 kilometers of sewer lines.  As of the same date, we operated 247 water treatment facilities and 565 sewage treatment facilities
(including nine ocean outfalls), as well as 16 water quality control laboratories.

As of December 31, 2018, the total net book value of our property, plant and equipment, intangible assets (including concession assets) and

contract assets was R$36,688.0 million.

All of our material properties are located in the state of São Paulo.

ITEM 4A.     UNRESOLVED STAFF COMMENTS

Not applicable.

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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, 2018, 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  369 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.  In December 2018, we entered into an agreement with the municipality of Guarulhos, previously served on a wholesale basis, for the
direct supply of water and sewage services to the municipality of Guarulhos. The operation began in January 2019.

The São Paulo metropolitan region, which includes the city of São Paulo, is our most important service region.  With a total population of
approximately 20.9 million, the São Paulo metropolitan region accounted for 72.2%, 70.7% and 69.7% of our gross operating revenue in 2018,
2017 and 2016 (excluding revenues relating to the construction of concession infrastructure), respectively.  As of December 31, 2018, 64.2% 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.  In 2017 and 2018, 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.

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:

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Increase in average tariff(1)
Inflation – IPC – FIPE
Inflation – IPCA
Inflation – IGP‑M

Year ended December 31,

2018
3.51%
3.02%
3.75%
7.54%

2017
7.89%
2.27%
2.95%
(0.52)%

2016
8.45%
6.54%
6.29%
7.17%

(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 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.

In  2018,  Brazilian  GDP  increased  1.1%  in  comparison  with  2017.  Brazil’s  trade  surplus  in  2018  was  US$58  billion  and  at  year-end  the

country had US$374.7 billion in currency reserves. The average unemployment rate in Brazil in 2018 was 12.3%.

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.  In  2018  the  SELIC  rate  decreased  to
6.40%. 

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 30 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$6,669.4 million as of December 31, 2018, of which R$738.5 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 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. In 2018, the 17.1%
depreciation  of  the real against  the  dollar  and  the  20.0%  depreciation  of  the  real against  the  yen  led  to  a  foreign  exchange  loss  of  R$915.9
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.

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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:

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.

Year ended December 31,
2017

2018
(in reais, except percentages)

17.13%
3,8748

3.6558

1.50%
3.3080

3.1925

2016

(16.54)%
3.2591

3.3523

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:

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.

2018

19.97%
0.0353

0.0331

Year ended December 31,
2017
(in reais, except percentages)
5.38%
0.0294

0.0291

2016

(13.89)%
0.0279

0.0289

During the years ended December 31, 2018, 2017 and 2016 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, rainfall 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, 2018, the reservoirs in the São Paulo metropolitan region, where our largest market is located, contained 943.3 million
m3 of water storage for treatment, compared to 916.8 million m3 available for treatment as of December 31, 2017.  The measurements for these
years do not include the technical reserve of 287.5 million m³.  In December 2018, this system served 6.8 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 a series of measures from February 2014 until April
2016. 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  2014-2015
Water Crisis”.

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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, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016.  Bad debt expense, net of recoveries, is included in
selling  expenses,  and  was  R$166.7  million,  R$82.7  million  and  R$90.5  million  for  the  years  ended  December  31,  2018,  2017  and  2016,
respectively.    In  2018,  the  transactions  with  wholesale  customers  generated  a  reversal  of  wholesale  sales  losses,  amounting  to  a  revenue  of
R$529.1 million, mainly due to the agreement with the municipality of Guarulhos (for more information on this agreement, see Note 9 to our
2018 financial statements included in this annual report). In 2017 and 2016, we recorded wholesale losses amounting to R$203.5 million  and
R$328.7 million respectively, were 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,  expected  future  losses,  the  aging  of  the  accounts  receivable  portfolio,
recoveries of previously written off receivables and other factors.  Actual results could differ from those estimates.

Intangible Assets Arising from Concession and Program Contracts

As of December 31, 2018, we had intangible assets of R$29,012.5 million and contract asset of R$7,407.9 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 into 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 20 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.

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As  of  December  31,  2018,  we  were  party  to  judicial  and  administrative  proceedings,  relating  to  civil,  environmental  and  tax  matters,
amounting to R$892.9 million (after deducting court escrow deposits in the amount of R$100.8 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$56,605.5
million, of which we believe R$47,812.4 million of those have a remote probability of an outflow of resources embodying economic benefits
exists.

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 5.30% in
2017 to 4.84% in 2018 under Plan G0 and from 5.35% in 2017 to 4.91% in 2018 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 21 (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 21 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, 2018 and 2017, we have recognized R$261.2 million and R$36.8 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 19] 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)(iv) to our financial statements included in this annual report.

As  of  December  31,  2018  and  2017,  the  amounts  not  recognized  related  to  pension  benefits  paid  by  us  on  behalf  of  the  State  totaled
R$1,107.1 million and R$1,021.7 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,  2018  and  2017,  the  pension  benefit  obligations  of  Plan  G0  totaled
R$2,606.1 million  and  R$2,543.9  million,  respectively.    For  detailed  information  on  the  pension  benefit  obligations  refer  to  Note  21  to  our
financial statements included in this annual report.

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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 withdraw 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 withdraw 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(b) to our financial statements included in this annual report.

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,

2018

2017

2016

(in millions of reais, except percentages)

Net operating revenue

Cost of services
Gross profit
Selling expenses
Allowance for doubtful accounts (*)
Administrative income (expenses)
Other operating income (expenses), net and equity 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

16,085.1

(9,086.5)
6,998.6
(693.5)
(166.7)
(996.9)

35.1

5,176.6
(1,264.3)
3,912.3
(1,077.2)

2,835.1

100.0%

(56.5)%
43.5%
(4.3)%
(1.0)%
(6.2)%

0.2%

32.2%
(7.9)%
24.3%
(6.7)%

17.6%

14,608.2

(8,778.9)
5,829.3
(768.7)
(82.7)
(1,099.0)

100.0%

(60.1)%
39.9%
(5.3)%
(0.6)%
(7.5)%

14,098.2

(9,013.1)
5,085.1
(730.0)
-
(934.9)

100.0%

(63.9)%
36.1%
(5.2)%
-
(6.6)%

0.1

0.0%

9.5

0.1%

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%

(*) Starting January 1, 2018, we adopted IFRS 9. As a result, in 2018 and 2017 we recorded our allowance for doubtful accounts in the income statements as a separate item. In

2016, the amount of allowance for doubtful accounts in the income statements was R$90.5 million and was presented as part of our selling expenses.

Year Ended December 31, 2018 Compared to Year Ended December 31, 2017

Net operating revenue 

Net operating revenue increased by R$1,476.9 million, or 10.1%, to R$16,085.1 million in 2018 from R$14,608.2 million in 2017. These

main factors that led to the increase were:

·         tariff repositioning index of 7.9% since November 2017;

·         tariff repositioning index of 3.5% since June 2018;

·         increase of 1.5% in our total billed volume (1.5% in water and 1.5% in sewage); and

·         formalization of the agreement with the municipality of Guarulhos in 2018, in the amount of R$928.0 million, representing an

increase of R$800.0 million in operating revenue.

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Construction revenue decreased by R$348.2 million, or 11.1%, to R$2,802.7 million in 2018 from R$3,150.9 million in 2017. This variation
was mainly due to the increase in asset investments carried out in 2017 in the municipalities served by the Company, particularly in the São
Lourenço Production System (Sistema Produtor São Lourenço). 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$307.6 million, or 3.5%, to R$9,086.5 million in 2018 from R$8,778.9 million in 2017. As a percentage

of net operating revenue, cost of services decreased to 56.5% in 2018 from 60.1% in 2017.

The increase in cost of services was principally due to the following factors:

·         an increase of R$162.5 million in the cost of electricity, mainly due to: (i) an average increase of 7.3% in free market tariffs, with
a 3.6% increase in consumption; (ii) an average increase of 4.9% in the Tariff for the Use of Distribution System (TUSD), with a
13.5%  increase  in  consumption;  and  (iii)  an  average  increase  of  10.4%  in  regulated  market  tariffs,  without  any  relevant
consumption variations;

·                  an  increase  of  R$139.4  million  in  the  cost  of  services,  due  to  several  factors,  mainly:  (i)  an  increase  of  R$34.9  million  in
maintenance  of  water  and  sewage  systems  costs;  and  (ii)  a  higher  cost  associated  with  the  hiring  of  technical  services,  in  the
amount of R$25.3 million;

·                 an  increase  of  R$94.7  million  in  salaries  and  payroll  charges  and  Pension  plan  obligations  mainly  due  to:  (i)  an  increase  of
R$156.2  million  due  to  the  provision  for  those  who  joined  the  Knowledge  Retention  Program  (Programa  de  Retenção  do
Conhecimento – PRC), launched in 2018, aiming to mitigate the impact of the exit of employees who possess strategic knowledge
acquired throughout their career; and (ii) an increase of R$71.9 million in expenses related to health insurance. These increases
were  partially  offset  by  the  reversal  of  R$136.5  million  in  the  Provision  for  the  Consent  Decree  (Termo  de  Ajustamento  de
Conduta – TAC), related to the employees who joined the PRC;

·                  an  increase  of  R$102.7  million  in  depreciation  and  amortization,  arising  from  the  conclusion  of  construction  of  concession

intangible assets; and

·         an increase of R$97.3 million in general expenses, mainly due to the following factors: (i) higher provision for the Municipal
Fund  for  Environmental  Sanitation  and  Infrastructure,  in  the  amount  of  R$53.0  million,  as  a  result  of  the  increase  in  revenues
generated  from  the  municipality  of  São  Paulo;  and  (ii)  higher  charges  for  the  use  of  water,  in  the  amount  of  R$39.0  million,
related to complementary payments made between 2014 and 2016, due to the signing of an agreement between us and the Alto
Tietê Hydrographic Basin Agency Foundation (Fundação Agência Bacia Hidrográfica Alto Tietê – FABHAT) in 2018.

The increase was partially offset by the decrease of R$340.9 million in construction costs, due to higher construction costs in 2017, mainly

with regards to the São Lourenço Production System.

Gross Profit

As a result of the factors discussed above, gross profit for the year ended December 31, 2018 increased by R$1,169.3 million, or 20.1 %, to
R$6,998.6 million  in  2018  from  R$5,829.3 million  in  2017.    As  a  percentage  of  net  operating  revenue,  our  gross  profit  margin  increased  to
43.5% in 2018 from 39.9% in 2017.

Selling Expenses

Selling expenses increased by R$7.5 million, or 1.1%, to R$693.5 million in 2018 from R$686.0 million in 2017.  As a percentage of net

operating revenue, selling expenses decreased to 4.3% in 2018 from 4.7% in 2017.  The increase in selling expenses was primarily due to:

·                 an increase of R$15.2 million in expenses with services, mainly due to an increase in expenses related to the hiring of credit

recovery services and technical services, in the amounts of R$6.5 million and R$5.8 million, respectively;

·         an increase of R$8.1 million in general expenses, due to the increase in the collection of bills from certain banks; and

·         an increase of R$1.9 million in material expenses, mainly due to the consumption of fuels and lubricants.

The increase in selling expenses was partially offset by the decrease of R$19.8 million in salaries and expenses, mainly due to the migration
of employees whose termination amounts were provisioned in the Provision for Consent Decree (Termo de Ajustamento  de  Conduta  -  TAC),
who joined the Knowledge Retention Program - PRC, generating a reduction of R$17.0 million in total expenses with these provisions.

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Allowance for Doubtful Accounts

Our allowance for doubtful accounts increased by R$84.0 million, or 101.6%, to R$166.7 million from R$82.7 million, mainly due to the

higher recovery of amounts in 2017, in the amount of R$77.8 million.

Administrative Income (Expenses)

Administrative  expenses  decreased  by  R$102.1  million,  to  R$996.9  million  in  2018  from  R$1,099.0  million  in  2017,  mainly  due  to  the

EMAE agreement occurred in 2017 .

Other Operating Income (Expenses), Net and Equity in Results of Investments in Affiliates

Other operating income, net was R$35.1 million in 2018 compared with R$0.1 million operating income, net in 2017.

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  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.

Other  operating  income  (expenses)  increased  by  R$35.0  million,  mainly  influenced  by  the  provision  of  obsolete  goods  in  2017,  in  the
amount of R$15.1 million, and an increase in amounts received from the Hydrographic Basin Depollution Program, in the amount of R$11.2
million, due to the accomplishment of the goals of the program.

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$806.2 million to a financial expense, net of R$1,264.3 million  in  2018  from  a  financial
expense, net of R$458.1 million in 2017. As a percentage of net operating revenues, financial expense amounted to 7.9% in 2018 compared with
a financial expense of 3.1% in 2017. The variation was due to an increase of R$819.5 million in exchange rate variation on loans and financing,
due to the appreciation of the U.S. dollar and the Japanese Yen against the Real in 2018 (17.1% and 20.0%, respectively), compared to a more
moderate appreciation in 2017 (1.5% and 5.3%, respectively).

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$408.7 million,  to  R$3,912.3
million in 2018 from R$3,503.6 million in 2017.  As a percentage of net operating revenue, our profit before income tax and social contribution
increased to 24.3% in 2018 compared to 24.0% in 2017.

Income Tax and Social Contribution

Income tax and social contribution expense increased by R$92.9 million to R$1,077.2 million in 2018 from R$984.3 million in 2017.  This
increase was mainly due to the increase in operating revenues, mitigated by the higher electricity and services costs, as well as the increase in
exchange rate variation expenses, due to the higher appreciation of the U.S. dollar and the Japanese Yen against the Real in 2018.

Profit for the year

As a result of the factors discussed above, our profit for the year increased to R$2,835.1 million in 2018 from R$2,519.3 million in 2017. As

a percentage of net operating revenue, our profit for the year increased to 17.6% in 2018 from 17.2% in 2017.

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.

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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:

·         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.

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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.

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.

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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, 2018, we had R$3,029.2 million in cash and
cash  equivalents.    The  outstanding  current  portion  of  our  long-term  indebtedness  was  R$2,103.6  million  as  of  December  31,  2018,  of  which
R$738.5 million was denominated in foreign currency.  Long‑term indebtedness was R$11,049.2 million as of December 31, 2018, of which
R$5,930.9 million consisted of foreign currency-denominated obligations. 

Our management expects that the cash and cash equivalents available on December 31, 2018, the operating cash generation estimated for
2019 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 R$3,842.9 million, R$3,301.9 million and R$3,003.6 million in 2018,
2017 and 2016, 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  2018  is
principally due to the increase of 1.5% in our total billed volume (1.5% in water and 1.5% in sewage). This increase was partially offset by the
income tax and social contribution paid in 2018.

Net Cash Used in Investing Activities

Net  cash  used  in  investing  activities  was  R$  2,189.3  million,  R$1,971.4  million  and  R$2,130.7  million  in  2018,  2017  and  2016,
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$389.7 million (including capitalized interest) in the São Lourenço PPP, a construction project planned and initiated before the
water crisis, and the amount of R$928.0 million related to agreement with the municipality of Guarulhos, that did not impact our cash flow in
2018.

Net Cash Used in Financing Activities

Our net cash used in financing activities was R$907.5 million, R$933.6 million and R$625.9 million in 2018, 2017 and 2016, 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  8.7%,  from  R$12,101.0  million  as  of  December  31,  2017  to  R$13,152.8  million  as  of
December  31,  2018.  In  addition,  during  the  same  period,  our  total  indebtedness  denominated  in  foreign  currency  increased  by  17.6%,  from
R$5,672.8 million as of December 31, 2017 to R$6,669.4 million as of December 31, 2018.

As of December 31, 2018, we had R$11,049.2 million in long-term indebtedness outstanding (excluding the current portion of long-term
indebtedness), of which R$5,930.9 million consisted of foreign currency-denominated long-term debt. We had an outstanding current portion of
long-term indebtedness of R$2,103.6 million as of December 31, 2018.  As of December 31, 2018, R$738.5 million of this current portion of
long-term indebtedness was denominated in foreign currency. As of December 31, 2018, our S&P domestic rating was brAAA 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, 2018, 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, 2018, 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$4,792.5  million  (R$4,749.5  million  of  principal  and  R$43.0  million  related  to  interest  and  charges).    See  “—Indebtedness  Financing—
Financial Covenants—Local currency denominated indebtedness” and Note 17 to our financial statements included in this annual report. The
following table sets forth information on our indebtedness outstanding as of December 31, 2018:

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Denominated in local currency:

10th issue of debentures
12th issue of debentures

14th issue of debentures

15th issue of debentures

17th issue of debentures

18th issue of debentures

20th issue of debentures

21st issue of debentures

22nd issue of 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

Current

Noncurrent

Total

Final Maturity

Interest Rates*

  December 31, 2018 

42,493

45,450

41,270

359,394

279,100

33,469

248,334

-

-

75,223

16,899

11,227

4,364

3,186

23,632

30,589

31,615

19,077

1,380

98,410

40,194

249,249

103,005

82,687

294,699

2020

2025

144,275

2022

-

359,394

2019

532,691

165,267

811,791

2023

198,736

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)

-

248,334

2019

CDI + 3.80%

499,604

756,040

499,604

2022

756,040

2025

CDI + 0.60% & CDI + 0.90%
CDI + 0.58% (1st series) & CDI + 0.90%
(2nd series) & IPCA + 6.00% (3rd series)

1,266,592

1,341,815

2019/2039

TR + 5% to 9.5%

-

39,169

18,811

23,100

123,875

252,197

490,729

549,589

8,163

-

16,899

2019

2.5% + TJLP

50,396

2023

2.15% + TJLP

23,175

2027

1.72% + TJLP

26,286

2027

1.72% + TJLP

147,507

2025

1.92% + TJLP

282,786

2028

1.66% + TJLP

522,344

568,666

2035

2035

9,543

2025

98,410

2.5% + TJLP

7.73% to 10.12% + IPC
TJLP + 1.5% (FINEP) & TR + 12.00%
(Presidente Prudente)

Total denominated in local currency

1,365,112

5,118,275

6,483,387

Denominated in foreign currency:
Inter-American Development Bank (IADB)

US$616,404,000 
(2017 - US$527,096,000)

International Bank for Reconstruction and
Development (IBRD) US$91,286,000
(2017 – US$79,946,000)

Deutsche Bank – US$75,000,000 (2017 -

US$150,000,000)

Eurobonds - US$350,000,000 (2017 – US$

350,000,000)

JICA 15 - ¥ 12,676,730,000
(2017 - ¥ 13,829,160,000)
JICA 18 - ¥ 11,397,760,000 
(2017- ¥ 12,433,920,000)
JICA 17 - ¥ 1,826,957,000 
(2017- ¥ 1,534,959,000)
JICA 19 - ¥ 31,561,726,000 
(2017 - ¥ 29,777,232,000)

IADB 1983AB – US$ 58,462,000 (2017 –

US$ 82,404,000)

Interest and others charges

163,924

2,208,519

2,372,443

2025 to 2035

3.31% to 3.42%

11,779

288,479

341,646

353,425

2034

2.85%

-

288,479

2019

LIBOR + 4.50%

-

1,354,532

1,354,532

2020

6.25%

40,646

36,545

11,835

64,028

68,554

52,710

406,462

365,230

51,786

1,047,081

155,653

-

447,108

2029

1.8% & 2.5%

401,775

2029

1.8% & 2.5%

63,621

2035

1.2% & 0.01%

1,111,109

2037

1.7% & 0.01%

224,207

2023

LIBOR + 2.08% to 2.38%

52,710

Total denominated in foreign currency

              738,500

              5,930,909

             6,669,409

Total loans and financing

          2,103,612

           11,049,184

          13,152,796

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*

            TR was 0.00% per month as of December 31, 2018; CDI stands for Interbank Deposit Rate (Certificado de Depósitos Interbancários), which was 6.40% per annum as of December 31, 2018; IGP‑M
was 7.54% per annum as of December 31, 2018; TJLP stands for Long‑term Interest Rate (Taxa de Juros a Longo Prazo), published quarterly by the Central Bank, which was 6.98% per annum as of
December 31, 2018; and USD LIBOR was 1.69 as of December 31, 2018.

The following table shows the maturity profile of our debt, as of December 31, 2018, for the period indicated:

Loans and financing

2,103.6

2,559.0

1,062.8

1,148.3

939.6

5,339.5

13,152.8

2019

2020

2021

2022

2023

(in millions of reais)

After
2024

Total

Referring  to  all  of  our  foreign  currency-denominated  indebtedness,  the  amount  of  R$4,593.1  million,  net  of  transaction  costs,  as  of
December  31,  2018  was  denominated  in  U.S.  dollars  and  R$2,023.6  million  was  denominated  in  Japanese  Yen.  This  indebtedness  consisted
principally of:

·

R$2,372.5 million (US$616.4 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$353.4  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),  a
program ended in 2017, which consisted of various projects that focused on the preservation and improvement of water sources in
the  metropolitan  region  of  São  Paulo.    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$224.2  million  (US$58.5  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 2.08% 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$1,354.5  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; 

R$2,023.5  million  (¥57,463.2  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 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

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·         R$288.5 (US$75.0 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$6,483,4 million as of December 31, 2018 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 2018, 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 2042. The
principal amount accrues interest from 5.0% to 8.0%.  The financing agreements are collateralized (i) by the pledge of collections of
monthly billings of water supply and sewage services up to three monthly installments until reaching 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, 2018, the outstanding debt was R$1,341.8 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,
2018, the outstanding debt was R$16.9 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,
2018, the outstanding debt was R$50.4 million;

·         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, 2018, the outstanding debt was R$147.5 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  recognized  a  contract  asset  (as  of  December  31,  2018,  with  the
adoption of IFRS 15 - Revenue from contract with customer, since 1 January 2018, assets related to concessions under construction,
registered under the scope of IFRIC 12 - Concession Contracts, are classified as Contract Assets during the construction period and are
transferred to Intangible Assets only after completion of the works. For more information of this adoption, see Note 4.1 to our 2018
financial  statements  included  in  this  annual  report)  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, 2018, the outstanding debt was R$568.7 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, 2018, the outstanding debt was R$49.5 million;

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·         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, 2018, the outstanding debt was R$282.8 million;

·                 in June 2014, we entered into a R$61.1 million financing agreement with BNDES.  Amortization of the principal amount is being
made 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 is being
made 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, 2018, the outstanding debt was R$522.3 million; and

·         in October 2015, we entered into a R$48.3 million financing agreement with Funding Authority for 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,  2018,  the
outstanding debt was R$9.6 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,  2018,  the  outstanding  debt  of  the  tenth  issuance  of  debentures  is  R$82.7  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, 2018, the outstanding debt of the
fourteenth issuance of debentures is R$$144.3 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,
2018, the outstanding debt of the eighteenth issuance of debentures is R$198.8 million.

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, 2018, the outstanding debt of the twelfth issuance of debentures is R$294.7 million.

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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, 2018, the outstanding debt of the fifteenth issuance of debentures is
R$359.4 million.

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, 2018, the outstanding debt of the seventeenth issuance of debentures is R$811.8 million.

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, 2018, the
outstanding debt of twentieth issuance of debentures is R$248.3 million.

In June 2017, we carried out 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,  2018,  the  outstanding  debt  of  the  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.  As  of
December 31, 2018, the outstanding debt of the twenty-second issuance of debentures is R$756.0 million.

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 contains 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.

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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.

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 17 to our financial statements
included in this annual report.

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, 2018 and 2017, we had met all the requirements of 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  our  indebtedness  with  BNDES,  including  the  10th,  14th,  and  18th  issuances  of  debentures  held  by
BNDES,  which  totaled  R$1,444.8  million  as  of  December  31,  2018.    The  only  financing  agreement  which  is  exempt  from  the  renegotiated
financing is contract No. 08.2.0169.1.  See Note 17 (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 our 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 ratios mentioned above 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). 

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;

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·         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, 2018, the amount that must pass through the blocked collateral account is R$242.9 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  ratios  mentioned  above  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 will reduce the interest charged on this loan 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.

Additionally,  since  2018,  we  are  subject  to  financial  covenants  under  the  new  financing  agreements  executed  with  Caixa  Econômica
Federal. These financial covenants require us to maintain the following financial indexes, calculated for the past twelve months on a quarterly
basis:

- Adjusted EBITDA / Adjusted Financial Expenses, equal to or greater than 2.80;

- Adjusted Net Debt / Adjusted EBITDA, equal to or lower than 3.80;

- Other Onerous Debt / Adjusted EBITDA equal to or lower than 1.30.

These agreements provide that disbursements may be suspended if any of these covenants are not being complied with. In the event of non-

compliance with the terms of these agreements, Caixa Econômica Federal may request the anticipated payment of the entire loan.

The  agreements  with  Caixa  Econômica  Federal  also  contain  a  cross-default  clause  and  an  early  maturity  clause,  in  the  event  of  non-
compliance with the terms of the contract, the Caixa Econômica Federal can request the anticipated payment of part or all of the loan. See Note
17 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 July 11, 2018, our credit rating and the one assigned to the
twelfth  debenture  issuance  by  S&P  were  both  “brAAA”.  This  issuance  has  a  cross-default  clause.  See  Note  17  to  our  financial  statements
included in this annual report.

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The tenth, fourteenth and eighteenth issuances follow the covenants included in the BNDES loans, as described above, and contain a cross-

default clauses.  See Note 17 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 17 to our financial statements.

The table below shows the more restrictive covenants ratios and our financial covenants ratios as of December 31, 2018.

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 17 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, 2018
8.05
1.56
1.99
0.46
1.63
8.93
1.52

(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, 2018 and 2017, we complied with all the covenants of our 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 2018, we recorded R$4.2 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$18.7  billion  from  2019  through  2023.    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$792.2  million,  R$703.9  million  and
R$823.5 million in 2018, 2017 and 2016 and, respectively.  See “Item 7.B. Related Party Transactions—Dividends”.

C.      Research and Development, Patents and Licenses, Etc.

Research and innovation

Our strategic innovation process goes beyond the development of new technologies, products and services.  It involves the creation of new
business models, new ways of meeting the needs of consumers, new organizational processes, new ways of competing and cooperating in the
business environment and improvements to service delivery, while at the same time promoting protection of the environment and public health.

In 2018, we allocated R$10.6 million to Research, Development and Innovation, or RD&I, projects. These resources are a differential in our
results  and  indicate  our  capacity  for  innovation  and  pioneering,  which  can  bring  fiscal,  tariff  and  financial  advantages.  We  also  set  up  a
Corporate  “Research,  Technological  Development  and  Innovation”  Program,  which  allows  us  to  differentiate  the  financial  resources  spent
specifically for this purpose within our budget structure.

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In  line  with  business  planning,  the  structuring  of  RD&I  actions  is  based  on  the  concept  of  a  circular  economy,  that  is,  based  on  the
intelligence of nature, the circular process opposes the traditional linear production process. As part of this concept, residues are inputs for the
production of new products and new cycles.  We have highlighted below certain RD&I projects that use the concept of a circular economy as
part of the processes for the treatment of sewage.

The technical cooperation agreement with the German Fraunhofer Institute resulted in the inauguration of the Biogas Benefit System for
Vehicular Use at the sewage treatment plant in Franca in April 2018. This project is the only one in Latin America that produces biomethane
from sewage treatment. The plant treats an average of 500 liters per second of sewage and produces around 2,500 m³ of biogas per day, enough
to replace 1,500 liters of common gas daily. It currently supplies part of the unit’s fleet of vehicles. Biomethane was also tested in passenger
buses at the “Sweden-Brazil Innovation Week” promoted by the Swedish Embassy and Business Sweden, as well as the promotion of autonomy
and performance evaluation in a luxury vehicle, originally manufactured to use natural gas and gasoline.

At the same plant, we developed and are operating a sludge dryer based on solar radiation, financed by the Funding Authority for Studies

and Projects (Financiadora de Estudos e Projetos, or FINEP).

At the Barueri sewage treatment plant, we implemented a plasma gasification system for the processing of sludge generated.  It is current in
the adjustment phase to ensure it fully operates in a continuous and safe way. At the end of the process, the system generates inert residue with
drastic reduction in its volume. The project was funded by FINEP.

To  improve  the  quality  of  the  water  produced  for  industrial  reuse,  we  installed  an  innovative  ultraviolet  disinfection  system  at  the  Jesus

Netto wastewater reuse station, in the city of São Paulo.

Shortage of water is an increasingly imminent problem in large urban centers. Accordingly, an increasingly conscious use of water and the
search for alternative ways of reusing water are essential. With regard to projects that use the concept of the circular economy in the processes of
water  treatment,  we  have  undertaken  tests  under  a  technical  cooperation  agreement  with  Magni,  the  representative  of  the  Danish  company
Liqtech, for the use of ceramic membranes for the ultrafiltration of silicon carbide for the recovery of waste water from water treatment plants.

In partnership with the São Paulo State University Júlio de Mesquita Filho - UNESP, we are evaluating the technical and environmental
feasibility of the use of sludge from water treatment plants as raw material for the base and sub-base of pavements, adding value to a by-product.

The investment in optimization solutions and the implementation of innovative processes in water treatment and distribution and sewage
collection and treatment seek to stimulate the development of fast and efficient solutions, consolidating competitive advantages in the market
and improving its economic-financial sustainability.

We also developed biofiltration units for odor control to be installed in the sewage and pumping stations in Pinheiros and Pomar, in the city

of São Paulo. This is an example of a project fostered by studies developed internally by us. This project is also funded by FINEP.

We are also developing an engineering project for a vacuum collection and evacuation system for the depletion of a small area located in the
municipality  of  Itanhaém.  With  the  future  implementation  of  this  pilot  system,  it  is  expected  that  we  will  obtain  parameters  for  the  design,
operation  and  maintenance  of  this  type  of  technology  and  that  it  will  be  a  technical  alternative  for  exhaustion  in  areas  lacking  the  necessary
infrastructure.

From  our  partnership  with  the  São  Paulo  Research  Foundation  (Fundação  de  Amparo  à  Pesquisa  do  Estado  de  São  Paulo  –FAPESP)
financial resources are invested equally to subsidize and support the development of basic and applied research projects under the Program for
Support  of  Research  in  Partnership  for  Technological  Innovation  for  research  projects  in  academic  or  research  institutions,  whose  themes
originated from the demands pointed out by the operational areas. As an example, we highlight: the use of autonomous microlaboratories for
real-time phosphorus monitoring, development of an expert system for detection and diagnosis of leaks in urban water distribution networks, the
development of an electronic tongue for taste and odor of water, alternatives for application of water treatment plant sludge in soils and landfills,
granular aerobic sludge, among others. These projects are in progress, with preliminary results published.

In  partnership  with  FINEP,  the  “Technological  Innovations  Plan  of  Sabesp  for  Sanitation”  was  financed  under  the  FINEP  Inova  Brasil
program. The plan consists of four projects, totaling approximately R$60 million. These projects include: a system for the production of reuse
water for urban and industrial uses; biofiltration units for odor control to be installed in sewage elevated stations; sludge dryer based on solar
radiation  for  the  Franca  sewage  treatment  plant;  and  a  plasma  gasification  system  to  process  the  sludge  generated  at  the  Barueri  sewage
treatment system.

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Open Innovation

We are investing in the development and implementation of actions as part of Open Innovation, integrating ideas, thoughts, processes and
research from players from various internal and external segments of our company, aiming to improve its processes, products and services. This
project includes: Pitch Sabesp; partnerships among sanitation companies, participation in collaborative networks, design of the Innovation Lab
and Coworking, among others.

Pitch  Sabesp  was  a  public  competition  in  which  27  challenges  were  proposed  in  five  different  areas.  The  process  was  open  to  the
participation  of  individuals  and  companies,  including  startups  resident  in  Brazil  and  abroad.  The  selected  projects  will  soon  be  in  the  testing
phase for technical, economic-financial and business evaluation.

Collaborative  Networks  for  Innovation,  in  which  we  participate,  provide  integration  with  the  different  spheres  of  government,  startups,
companies,  universities,  development  institutions,  etc.  All  players  seek  to  add  knowledge  and  experience,  to  build  joint  solutions  for  the
challenge of implementing open innovation in the public sector. The participation of the Urban Living Labs working group (urban sustainability
laboratory - ULL) associated with an international consortium, the Belmont Forum, supported by the nexus among water use, food and power
generation,  or  FEW,  and  the  partnership  with  Ino3W  Ltd.  (Ino3W  community  water  system)  with  the  purpose  of  sharing  the  information  on
innovative technologies among large sanitation companies around the world.

In 2018, we entered into the second agreement with the São Paulo Research Foundation (Fundação de Amparo à Pesquisa do Estado de São
Paulo – FAPESP) to focus on supporting the execution of scientific and/or technological research in micro, small and medium enterprises in the
State of São Paulo.

We publish the DAE Magazine, a quarterly engineering journal that in 2018 totaled more than 200 issues since its first edition. This journal
includes a specialized team of opinion makers and is currently classified in the Qualis/CAPES system under the category “B2”. Through the
publication  of  technical  and  scientific  articles  on  basic  and  environmental  sanitation,  we  aim  to  encourage  and  disseminate  improvements  in
processes, innovations and technological advances.

D.      Trend Information 

Several factors may affect our future results of operations, liquidity and capital resources, including:

·

the interests of our controlling shareholder;

· our potential corporate reorganization, as approved by State Law No. 16,525 on September 15, 2017 or any other type of reorganization that

might be approved by the government that may include change in control;

·

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 we do not know if
they will return to their prior standards 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 withdraw up to 33m3/s; (ii) if the volume of water
is between 40% and 60% of the reservoirs’ capacity, we can withdraw up to 31m3/s; (iii) if the volume of water is between 30% and 40%

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of the reservoirs’ capacity, we can withdraw up to 27m3/s; (iv) if the volume of water is between 20% and 30% of the reservoirs’ capacity,
we can withdraw up to 23m3/s; and (v) if the volume of water available is lower than 20% of the reservoirs’ capacity, we can withdraw up
to 15.5m3/s;

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·

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

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

· 

·

·

the potential impacts of the Provisional Measure No. 868/2018 on our business if it is converted into law;

the outcome of any pending or future legal proceedings; 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, 2018.

F.       Tabular Disclosure of Contractual Obligations

Our debt obligations and other contractual obligations as of December 31, 2018 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

2,103.6

477.7

466.0

454.0

244.5

4,197.3

7,943.1

3,621.8

878.8

-

-

91.3

3,014.8

7,606.7

2,088.0

570.2

-

-

62.0

1,291.3

4,011.5

5,339.4

1,024.8

-

-

14.4

6,844.6

13,223.2

13,152.8

2,951.5

466.0

454.0

412.2

15,348.0

32,784.5

(1)         Estimated interest payments on loans and financing were determined considering the interest rates as of December 31, 2018.  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,
2018, see Note 17 to our financial statements as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016,
included elsewhere in this annual report.

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 nine 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”.

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Board of Directors

Our bylaws provide for a minimum of seven and a maximum of eleven 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, or the “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% (whichever is greater), 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
Benedito Pinto Ferreira Braga Junior who joined our board of directors on January 10, 2019 when he was appointed our Chief Executive Officer,
and Monica Ferreira do Amaral Porto who joined our board of directors on March 12, 2019. 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 six 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:

Director

Mario Engler Pinto Junior
Benedito Pinto Ferreira Braga Junior
Monica Ferreira do Amaral Porto
Reinaldo Guerreiro
Francisco Vidal Luna
Luís Eduardo Alves de Assis(2)
Francisco Luiz Sibut Gomide
Lucas Navarro Prado
Ernesto Rubens Gelbcke

Age
62
71
62
66
72
62
73
38
75

Position

Chairman
Member
Member
Independent Member(1)
Independent Member(1)
Independent Member(1)
Independent Member(1)
Independent Member(1)
Independent Member(1)

Date Elected
April 27, 2018
January 10, 2019
March 12, 2019
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018

(1)      These members comply with the independence requirements established by Federal Law No. 13,303/16 and the Novo Mercado rules.
(2)      Member indicated by the minority shareholders.

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.

Benedito Pinto Ferreira Braga Junior. Mr. Braga has been our Chief Executive Officer and a member of our board of directors since May
2018. He has a degree in civil engineering from the School of Engineering of São Carlos University of São Paulo (Escola de Engenharia de São
Carlos da Universidade de São Paulo – USP), a master's degree in Hydrology from Stanford University and a master's degree in Hydraulics
from USP, and a PhD in Water Resources from Stanford University. He was Secretary of Sanitation and Water Resources of the State of São
Paulo (Secretário  de  Saneamento  e  Recursos  Hídricos  do  Estado  de  São  Paulo)  from  January  2015  to  May  2018  and  was  the  Chairman  of
Sabesp's  Board  of  Directors  from  January  2015  to  April  2018.  He  was  a  professor  at  the  Polytechnic  School  of  USP  (Escola  Politécnica  da
USP), from 1980 until December 2018, and has been in a position of Sitting Professor since 1998. He was Co-Chairman of the International
Organizing Committee of the World Water Forum in Brasilia (2018), in Korea (2015) and Chairman of the Committee in France (2012). He is an
Honorary Chairman of the World Water Council – WWC, of which he was the Chairman from 2012 to 2018. Mr. Braga was also the Chairman
of the Intergovernmental Council of UNESCO’s International Hydrological Program from 2008 to 2009, Chairman of the International Water
Resources Association – IWRA, from 1998 to 2000, as well as, Executive Officer of National Water Agency (Agência Nacional de Águas, or
ANA) from 2001 to 2009.

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Monica Ferreira do Amaral Porto. Mrs. Porto has been a member of our board of directors since March 2019. She has a degree in Civil
Engineering from the Polytechnic School of the University of São Paulo (Escola Politécnica da Universidade de São Paulo – USP) and master’s
and PhD degrees in Hydraulic Engineering from the same institution. She has had a faculty position at the Department of Environmental and
Hydraulic Engineering of the Polytechnic School of USP (Departamento de Engenharia Hidráulica e Ambiental) since 1984 and has been a Full
Professor since 2005. She has also been a Head of Department at this institution since June 2018. She was Deputy Secretary of the Department
of Sanitation and Water Resources of the State of São Paulo (Secretaria de Saneamento e Recursos Hídricos do Estado de São Paulo – SSRH)
between January 2015 and May 2018. She is the Chairperson of the Committee for the Integration of the Paraíba do Sul River Basin (Comitê de
Integração da Bacia do Rio Paraíba do Sul), representing the SSRH. She was the Chief Executive Officer of the Hydraulic Technology Center
Foundation (Fundação Centro Tecnológico da Hidráulica) between 2008 and 2014. She has been a member of the Management Board of the
Department  of  Infrastructure  and  Construction  Works  of  the  São  Paulo  Municipal  Government  (Conselho  de  Gestão  da  Secretaria  de
Infraestrutura e Obras da Prefeitura de Municipal de São Paulo) since January 2017. She was an alternate member of the Board of Governors
of  the  World  Water  Council,  representing  USP.  From  1998  to  2012,  she  participated  in  several  international  water  resource  entities:  she  is  a
member  of  the  Advisory  Committee  for  the  World  Water  Quality  Assessment,  the  United  Nations  Environment  Program  and  the  Stockholm
Water  Prize  Committee,  among  others.  She  was  the  Chairperson  of  the  Brazilian  Association  of  Water  Resources  (Associação  Brasileira  de
Recursos Hídricos) from 1996 to 1997.

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.  In the private sector, he was the Executive Chairman of Banco Inter American Express S.A. He
is currently a member of the Board of Directors and Chairman of the Audit Committee of Desenvolve SP, member of the Board of Directors and
Audit Committee of Gafisa S.A and member of the Board of Curators of FIPE – Fundação Instituto de Pesquisas Econômicas, a member of the
Board of Trustees of the Fundação  Faculdade  de  Medicina  -  FFM  and  a  member  of  the  Board  of  Trustees  of  FIPE  -  Fundação  Instituto  de
Pesquisas Econômicas.

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. He was a member
of our Audit Committee from May 2017 to August 2017. He holds Bachelor’s degrees in Civil Engineering and in Economic Sciences from the
Federal  University  of  Paraná  (Universidade  Federal  do  Paraná)  and  a  PhD  in  Hydrology  and  Water  Resources  from  the  Colorado  State
University. He was the Minister of Mines and Energy in 2002, CEO of ESCELSA – Espírito Santo Centrais Elétricas S.A. between 1995 and
2001,  the  CEO  of  the  Energy  Company  of  Mato  Grosso  do  Sul  between  1997  and  2001,  the  General  Brazilian  Diretor  of  Itaipu  Binacional
between 1993 and 1995, the CEO of the Energy Company of Paraná (Companhia Paranaense de Energia – Copel) between 1986 and 1993 and
the  Chief  Financial  Officer  of  the  same  company  from  1983  to  1985.  Mr.  Gomide  was  also  a  professor  at  the  Federal  University  of  Paraná
(Universidade  Federal  do  Paraná)  from  1970  to  1995.  Between  1969  and  1982,  he  was  a  hydraulic  engineer  and  hydrologist  at  the  Energy
Company of Paraná.

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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.

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

Benedito Pinto Ferreira Braga Junior
Adriano Candido Stringhini
Rui de Britto Álvares Affonso
Paulo Massato Yoshimoto
Ricardo Daruiz Borsari
Edison Airoldi

Age
71
43
61
66
63
62

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
January 10, 2019
January 10, 2019
June 22, 2017
June 22, 2017
January 10, 2019
June 22, 2017

Benedito Pinto Ferreira Braga Junior.  See above, “—Board of Directors”.

Adriano  Candido  Stringhin.  Mr.  Stringhini  was  Sabesp's  Head  of  Communication  from  April  2009  to  January  2019  and  Head  of  Legal
Affairs  from  2007  to  2009.  He  has  a  master's  degree  in  Law  from  the  Law  School  of  University  of  São  Paulo  (Faculdade  de  Direito  da
Universidade  de  São  Paulo  –  USP).  He  has  a  degree  in  Law  from  USP  and  he  is  specialist  in  Organizational  Strategic  Communication  and
Public Relations from School of Communications and Arts of USP (Escola de Comunicações e Artes – ECA/USP). He was the Head Lawyer of
Funding  Authority  for  Studies  and  Projects  (Financiadora  de  Estudos  e  Projetos  -Finep-SP)  of  the  Ministry  of  Science  and  Technology
(Ministério  da  Ciência  e  Tecnologia)  from  2002  to  2007.  He  was  advisor  of  the  Chief  Executive  Officer  of  the  Administrative  Council  for
Economic Defense (Conselho Administrativo de Defesa Econômica – CADE), between 1999 and 2001. He was a professor in undergraduate and
graduate courses of several institutions, among them: Fundação Getúlio Vargas - FGV, Mackenzie University and School of Law of the Lawyers
of São Paulo Institute (Escola Paulista de Advocacia do Instituto dos Advogados de São Paulo – IASP).

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. In 2017 Mr. Affonso won the Professional Award of the Year of 2016 in Finance
by ANEFAC/SERASA EXPERIAN

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- National Association of Executives of Finance, Administration and Accounting.

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.

Ricardo Daruiz Borsari.  Mr.  Borsari  has  a  degree  in  Civil  Engineering  and  a  master's  degree  in  Civil  Engineering  from  the  Polytechnic
School  of  University  of  São  Paulo  (Escola  Politécnica  da  Universidade  de  São  Paulo  –  USP).  He  was  Secretary  of  Sanitation  and  Water
Resources  of  the  State  of  São  Paulo  from  May  to  December  2018.  He  worked  in  several  positions  at  the  Department  of  Water  and  Electric
Energy (Departamento de Águas e Energia Elétrica – DAEE), among them: Engineer since 1978, Executive Officer from January 2015 to May
2018  and  from  June  2001  to  February  2007,  Executive  Officer  of  Engineering  and  Construction  Works  from  August  2010  to  October  2011,
Executive Officer of the Technology Center of Hydraulic and Water Resources from July 2008 to October 2011. He was Executive Secretary of
the  Alto  Tietê  River  Basin  Committee  from  2001  to  2005  and  from  2017  to  2018  and  Chief  Executive  Officer  and  member  of  the  Board  of
Directors of Metropolitan Water and Energy Company (Empresa Metropolitana de Águas e Energia – EMAE), from 2011 to 2015. He was a
member  of  the  Board  of  Directors  of  Companhia  Energética  de  São  Paulo  -  CESP  between  April  2015  and  May  2018.  Mr.  Borsari  was  a
professor  at  several  institutions,  including:  School  of  Engineering  of  Mackenzie  University  from  1979  to  1980,  School  of  Engineering  of
Fundação Armando Álvares Penteado – FAAP, from 1982 to 1986, Polytechnic School of USP, from 1989 to 2004, and Pontificial University
Catholic of São Paulo – PUCSP, from 1997 to 2001.

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 2018, 2017 and 2016, 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 was R$4.6 million, R$4.4 million and R$4.4 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  table  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:

2018

Year ended December 31,
2017
(in thousands of R$, except where indicated otherwise)

2016

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
Board of executive officers
Fiscal committee

Average amount of compensation
Board of directors

1,106
3,228
280
4,614

10
6
5

851
1,849
215

255
841
65

-
538
-

162
677
66

99
498
60

115

848
3,208
313
4,369

7
6
5

659
1,856
247

189
796
66

-
556
-

156
691
62

96
439
62

121

923
3,184
299
4,406

8
6
5

710
1,877
243

213
812
56

-
494
-

157
618
61

96
420
51

114

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Fiscal committee

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516
61

535
62

531
61

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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$36.2  million,  R$48.7  million  and  R$24.3  million  in  2018,  2017and  2016,  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, 2018, our obligation under
these  both  plans  (G0  and  G1)  totaled  R$2,970.0  million.    For  further  information  on  our  pension  plans  see  Note  21  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$110.5 million, R$94.4 million and R$83.7 million in 2018, 2017 and 2016, 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 29, 2019.  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”.

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. All of the current members of our
fiscal  committee  were  elected  in  the  shareholders’  meeting  held  on  April  27,  2018,  except  Marcio  Cury  Abumussi,  who  joined  our  fiscal
committee  on  October  30,  2018.    Their  tenure  will  end  on  April  29,  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(1)
Marcio Cury Abumussi
Gustavo Carvalho Tapia Lira
César Aparecido Martins Louvison
Leticia Pedercini Issa Maia(1)
  (1)

           Members indicated by the minority shareholders

Age
61
45
65
37
50
40
58
38

Position
Member
Member
Member
Member
Alternate
Alternate
Alternate
Alternate

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Date Elected
April 27, 2018
April 27, 2018
April 27, 2018
April 27, 2018
October 30, 2018
April 27, 2018
April 27, 2018
April 27, 2018

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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 and Sanitation Secretariat from 2007 to 2010 and the Secretariat for Infrastructure and Environment
since 2011 (former Secretariat for Sanitation and Water Resources).  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 Basin (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 Environmental Company of São
Paulo State (Companhia Ambiental do Estado de São Paulo -CETESB) from 1999 to 2007. 

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.

Marcio Cury Abumussi. Mr. Abumussi holds a degree in Mechanical Engineering from Universidade Paulista and a post-graduate degree in
Public  Management  –  Management,  Accounting  and  Finance  from  Fundação  Instituto  de  Pesquisas  Contábeis  Atuariais  –  FIPECAFI.  Since
2017,  Mr.  Abumussi  is  the  Head  of  the  Technical  Department  of  the  Secretariat  of  Finance  of  the  State  of  São  Paulo,  in  which  he  has  held
several  roles,  among  which:  technical  assistant  from  1997  to  2001,  Head  of  the  technical  division  from  2001  to  2008,  Head  of  the  technical
department from 2009 to 2016 and general administrative coordinator in 2017. He was a sitting member of the Fiscal Council of Companhia
Paulista  de  Securitização  –  CPSEC  from  2010  to  2017  and  alternate  member  of  the  Fiscal  Council  of  Empresa  Paulista  de  Planejamento
Metropolitano S/A – Emplasa from 2010 to 2011.

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). 

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.

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Leticia Pedercini Issa Maia. Mrs. 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
Ernesto Rubens Gelbcke 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 Conduct and Integrity, 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

Ernesto Rubens Gelbcke
Lucas Navarro Prado
Luís Eduardo Alves de Assis

Position
Coordinator and Financial Expert
Member
Member

Date Elected
June 21, 2018
August 24, 2017
September 30, 2016

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 created 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 is composed of up to three members, elected by a general shareholders’ meeting, without a fixed term of office. 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.  Currently,  our  Eligibility  and  Advisory  Committee  is  composed  of  three  members,  which  is
representatives from our legal, human resources and compliance departments.

Members of the Eligibility and Advisory Committee may attend board of directors’ meetings where matters related to this committee are

discussed and have the right to speak, but not to vote, in accordance with our bylaws.

This  committee  is  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.

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D.      Employees

As  of  December  31,  2018,  we  had  14,449  full‑time  employees.  On  December  31,  2018,  we  had  956  interns  and  485  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 

2018

As of December 31,
2017

2016

10,683
2,074
433
1,259

1,485
6,661
6,303
14,449

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

The  average  tenure  of  our  employees  is  approximately  19.2  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  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.

The  collective  bargaining  agreement  signed  in  2018  resulted  in:  (i)  a  salary  increase  of  1.29%  (which  corresponds  to  the  inflation
adjustment for the period); (ii) a  2% increase in meal vouchers; (iii) a 2% increase in food assistance; (iv) a 2% increase in nursery stipends; (v)
maintenance of the clause from the 2017/2018 collective bargaining agreement which guarantees the employment of 98% of our employees; and
(vi) maintenance of the Christmas food stipend on an exceptional basis.

We experienced a two-day strike in 2013, which did not interrupt the essential services that we provide.  In 2018, 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 December 31, 2018, less than 1% of our common shares were owned by our directors and executive officers. 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 17, 2019:

State of São Paulo(1)
Directors and executive officers of Sabesp
Others

(2)

Total

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Common shares

Shares

343,524,291
3,000
339,982,578

683,509,869

%

50.3%
0.0%
49.7%

100.0%

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(1)

It includes shares held by the Secretariat of Finance and Planning of the State of São Paulo (Secretaria da Fazenda e Planejamento do Estado de São Paulo) and other
companies controlled by the Government of the State of São Paulo.

(2) As of April 17, 2019, 83% of our outstanding common shares were held by 9,410 registered shareholders in Brazil.

As of April 17, 2019, 17% 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, as of March 31, 2019, 30 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

(currently Secretariat of Infrastructure and Environment) and the Secretariat of Finance (currently Secretariat of Finance and Planning), 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 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. Due to elections for state government in the
second  half  of  2018,  this  operation  was  suspended,  and  we  are  currently  awaiting  guidance  from  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, or any other type of corporate reorganization, including a change of control. We cannot assure that any
potential corporate reorganization, including a change of control, will not have a material adverse effect on our business.

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$501.1 million in 2018, R$463.0 million in 2017
and R$445.7 million in  2016.    Our  accounts  receivable  from  the  State  for  sanitation  services  totaled  R$105.7  million,  R$106.0  million  and
R$77.4 million, as of December 31, 2018, 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  2018,  2017  and  2016,  we  made  payments  to  former  employees  of  R$180.8  million,  R$179.5 million and R$178.7 million,  respectively  in
respect of Plan G0.  The State made reimbursements in 2018, 2017 and 2016 in the amounts of R$173.5 million, R$192.9 million and R$139.5
million, respectively.

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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.

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. 

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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. 

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, was being paid by the State in 114 consecutive monthly installments and was totally paid in 2018.

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

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·         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. 

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,  2018,  the  Disputed  Reimbursement  Amount  amounted  to  R$1,107.1  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,  2018,  we  had  made  a  provision  of  R$2,606.1  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.

On May 9, 2018 ARSESP announced the final results of the Second Ordinary Tariff Revision. Following this revision cycle, ARSESP will
pass-through to the tariffs up to 4% of the municipal revenue that is transferred by us to a legally established municipal infrastructure fund. Our
only contract that provides for this and complies with ARSESP´s requirements is with the municipality of São Paulo and, accordingly, today 4%
of the funds transferred to the São Paulo Municipal Fund for Environmental Sanitation and Infrastructure are being passed through to our tariffs.

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. This administrative appeal was denied by ARSESP on February 28,
2019. 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 as described above.

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). 

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.

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For more information on the aforementioned loans, see “Item 5.B. Liquidity and Capital Resources—Indebtedness Financing”.

Use of Reservoirs

We withdraw 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  withdraw  from  these
reservoirs.  Those lawsuits have now been settled by way of an agreement between EMAE and us. 

The  settlement  agreement  settled  the  compensation  arrangements  between  EMAE  and  our  company.  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 withdrawing 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
us.  The lawsuit is in its initial phase.  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 our condemnation 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  is  currently  being  appealed.  The  settlement  agreement  between  EMAE  and  us  will  not  necessarily  put  an  end  to  this  separate
lawsuit.

If one of the ongoing lawsuits by minority shareholders of EMAE requires the State to make a different decision regarding water use, from
what was agreed between EMAE and the State of São Paulo, our ability to withdraw water from the Guarapiranga and Billings reservoirs may
be compromised.  If we were no longer able to withdraw 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  9,082
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.

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 2018, 2017 and 2016 amounted to
R$8.9 million, R$9.9 million and R$10.4 million, respectively.

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The  expenses  related  to  personnel  assigned  by  other  entities  to  us  totaled  R$0.1  million  in  2018.    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.

Services Obtained from State Government Entities

As of December 31, 2018 and 2017, we had an outstanding amount payable of R$8.7 million and R$1.4 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, 2018 and 2017.

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$20.8 million, R$19.2 million and R$10.8 million in 2018, 2017 and 2016, 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 

The compensation paid by us to the members of our board of directors, board of executive officers and fiscal committee amounted to R$4.1
million,  R$3.8  million  and  R$3.9  million  in  2018,  2017  and  2016,  respectively,  and  it  refers  to  salaries  and  other  short‑term  benefits
management.  An additional R$0.5 million, R$0.6 million and R$0.5 million related to the bonus program was accrued to executive officers in
2018, 2017 and 2016.

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
to 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.

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The table below summarizes the terms of those agreements at December 31, 2018:

Companies

Aquapolo Ambiental S.A.
Total

___________________

Principal
disbursed

Interest
balance

Total

Interest rate

Maturity

19,000
19,000

13,857
13,857

32,857
32,857

CDI + 1.2% p.a.
 - 

(1)
  -

(1)     The loan agreement 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.

As of December 31, 2018, the principal and interest balance of this agreement was R$32.9 million, recorded as a non current assets under

“Other Accounts Receivable”. In 2018, we recognized financial income of R$2.8 million.

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 2018, we had completed approximately 25.5 thousand sewage connections under the Pró-Conexão program. 

C.      Interests of Experts and Counsel

Not applicable.

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 20 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 State of São Paulo Public Prosecutor Office 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, 2018, we have provisions totaling R$170.4 million for the matters stated in Note
20 to our financial statements included in this annual report.

Other Legal Proceedings

On  December  30,  2003,  the  Civil  Entity  Coordination  Committee  of  Piracicaba  filed  a  civil  class  action  against  us,  the  National  Water
Agency and the State of São Paulo Treasury Department seeking, among other claims relief for:  (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,  2018  is  R$25.8  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. 

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On November 30, 2012, the Public Prosecutor’s Office of the State of São Paulo on November 30, 2012 filed a civil class action against us
seeking: (i) the nullification of the contract we entered into with the municipality of São Paulo on June 23, 2010 regarding the supply of  water
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  presented  an  appeal.  This  first
decision  was  upheld  by  the  Court  of  Justice  and  was  finally  settled.  The  amount  involved  in  these  proceedings  is  R$16.5  billion  as  of
December 31, 2018.  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

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, 2018, 2017 and 2016 the balance of our legal reserve was R$1,200.0 million,
R$1,058.3 million and R$923.3 million, respectively, which was equal to 8.0%, 10.6% and 9.3%, 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 the creation of a discretionary reserve in its bylaws.  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, 2018, 2017 and 2016 we had an investment reserve of
R$3,840.4 million, R$6,939.3 million and R$5,249.8 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.

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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.

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.

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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, 2018 correspond to the minimum established by
law of 25.0% of the net income and the difference of R$792.2 million will be recorded in 2019 after the annual shareholders’ meeting.

Distributions of dividends

The  following  table  sets  forth  the  distributions  of  dividends  that  we  made  to  our  shareholders  in  respect  of  our  2018,  2017  and  2016

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,

Aggregate amount
proposed
(in millions of reais)

Payment Dates

Payment per share

Payment per ADS
(in reais)

2018
1.16
2017
1.03
2016
1.20
  *        We recorded dividends in the amount of R$673.3 million, which pursuant to our bylaws is our minimum dividend amount.  We expect to pay the dividends on June 28, 2019.

June 28, 2019
June 26, 2018
June 27, 2017

792.2
703.9
823.5

1.16
1.03
1.20

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 for our Common Shares

Our common shares have been listed on the São Paulo Stock Exchange (B3) under the trading symbol “SBSP3” since June 4, 1997 and,

starting on April 24, 2002, have been included in the Novo Mercado segment of that exchange. 

Market of our ADSs

Our ADSs, each of which represents one of our common shares are listed on the NYSE under the trading symbol “SBS”. 

B.      Plan of Distribution

Not applicable.

C.      Markets

Trading on the Brazilian Stock Exchange

Our 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.

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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.

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 certain additional corporate governance
practices  and  disclosure  requirements  in  addition  to  those  already  required  under  Brazilian  law.    A  company  with  shares  listed  on  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, among others:

· maintain only common 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 (i) 25.0% of the capital stock of the company, or (ii) 15.0% of the capital stock of the company,

in the event that the average daily trading volume is equal to or 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;

·   

resolve and require the shareholders, directors, and members of the fiscal committee of the company to resolve any and all disputes among
them by arbitration before the Chamber of Market Arbitration (Câmara de Arbitragem do Mercado); 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 the 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 certain 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

In addition to the general provisions of Brazilian law, our Board of Director’s Internal Charter contains the specific provisions set out below
regarding  a  director’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.

According to our Board of Director’s Internal Charter, when a matter involves a conflict of interest with ours or a particular interest in the
matter, each member of the Board of Directors shall (i) declare his impediment in a timely manner, as soon as he becomes aware of the fact, (ii)
refrain from intervening in the matter in discussion or deliberation, (iii) include the fact in the minutes of the meeting, and (iv) abstain from
discussions and deliberations.

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

Each  common  share  entitles  the  holder  thereof  to  one  vote  at  our  annual  or  special  shareholders’  meetings.    According  to  the  Brazilian
Corporate Law and CVM regulation, our shareholders’ meetings must 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
(in our case, the publication “Valor Econômico”), 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.

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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 prevent
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 address:

·        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.

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”.

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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. 

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.

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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;

·        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.

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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 composed specifically of internal funds for expansion of water and sewage service systems.  As of December 31,

2018, we had an investment reserve of R$3,840.4 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, 2018, the balance of our legal reserve was R$1,200.0 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. 

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.

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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 

·        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. 1,863/2018, of December 27, 2018.

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 or as a foreign direct investment under Law No. 4,131/1962.

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.

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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  December  31,  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. 

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-Brazilian 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 (i) a flat rate of 15% for a 4,373/2014 holder that is not a resident of or domiciled in a Nil or Low Taxation Jurisdiction; (ii) a flat
rate of 25.0% for a non‑Brazilian holder that is a resident of or domiciled in a Nil or Low Taxation Jurisdiction; (iii) 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),  for  all  other  non‑Brazilian  holders.  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.

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.

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 should not be 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.
10,833/2003.

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 of or domiciled 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.    On  2014  the  Brazilian  Revenue  Service  Ordinance  488  was  published,  reducing  from  20%  to  17%  the  minimum  threshold  for
certain  specific  cases.  The  reduced  17%  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.

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 and Ordinance 488/2014.

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:

(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.

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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.

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.

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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  ADSs,  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 reais will be foreign currency gain or loss that is treated as U.S. source ordinary income or
loss.  If dividends paid in reais are 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 reais received by the U.S. holder or the
Depositary or its agent are not converted into U.S. dollars on the date of receipt. 

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  or  ADSs  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.

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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  common  shares  or  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.    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 

  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 common shares or 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.

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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. 

Exchange Rate Risk

As of December 31, 2018 and 2017, R$6,669.4 million and R$5,672.8 million, or 50.7% and 46.9%, 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, 2018, 2017 and 2016 from each hypothetical instantaneous and unfavorable 1% change in the U.S. dollar and yen against the real
would  have  been  approximately  R$66.7  million,  R$56.7  million  and  R$56.6  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$666.9 million,
R$567.3 million and R$566.0 million as of December 31, 2018, 2017 and 2016, respectively.

The fluctuation of the real in relation to the U.S. dollar and yen for the years ended December 31, 2018, 2017 and 2016 were as follows:

Depreciation (appreciation) of the real in

relation to the U.S. dollar

Depreciation (appreciation) of the real in

relation to the yen

2018

17.1

20.0

Year ended December 31,

2017

(in percentages)

1.5

5.4

2016

(16.5)

(13.8)

We have not contracted derivative financial instruments in the years ended December 31, 2018, 2017 and 2016.

For further information regarding foreign currency risk, see Note 5.1(a) to our 2018 financial statements included in this annual report.

As of December 31, 2018, 2017 and 2016, we had no short‑term indebtedness outstanding, other than the current portion of long‑term debt.

Interest Rate Risk

As  of  December  31,  2018  and  2017,  R$1,642.4  million,  or  12.5%,  and  R$1,579.7  million,  or  13.1%,  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, 2018 and 2017, R$1,261.7 million, or 9.6%, and R$1,149.2 million, or 9.5%, respectively, of our total debt denominated in
reais was subject to interest rates based on the CDI.  As of December 31, 2018 and 2017, R$2,982.0 million and R$2,317.0 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.

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As of December 31, 2018 and 2017, 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$3,029.2 million and R$2,283.0 million as of December 31, 2018
and 2017, 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.

We  estimate  that  we  would  have  suffered  a  loss  over  periods  of  one  year,  respectively,  of  up  to  R$131.5  million,  R$121.0  million  and
R$119.6 million if a hypothetical instantaneous and unfavorable change of 100 basis points in the interest rates applicable to financial liabilities
as  of  December  31,  2018,  2017  and  2016,  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$1,315.3  million,  R$1,210.1
million  and  R$1,196.4  million  million  as  of  December  31,  2018,  2017  and  2016,  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,  2018.    For  the  foreign  currency  denominated  obligations,  these  amounts  have  been
converted  at  the  selling  rates  as  of  December  31,  2018  and  do  not  represent  amounts  which  may  actually  be  payable  with  respect  to  such
obligations on the dates indicated.

As of December 31, 2018
Expected maturity date

2019

2020

2021

2022 and
after

Total

(in millions, except percentages)

  Average
annual
interest
rate

3,029.2  

-  

- 

- 

3,029.2  

Assets

Cash equivalents denominated in reais

Liabilities
Long‑term debt (current and noncurrent

portion)

CDI

TJLP

IPCA

TR or UPR

Fixed rate, denominated in reais

Floating rate, denominated in reais indexed by

Floating rate, denominated in reais indexed by

Floating rate, denominated in reais indexed by

Floating rate, denominated in reais indexed by

123.5  
171.9 
326.6  
149.8 
36.9  
255.3 
140.4  
1,354.6 
2,559.0  
UPR stands for Standard Reference Unit (Unidade Padrão Referência) and is equal to TR, which  was 0.00% per month as of December 31, 2018; CDI stands for Interbank
Deposit Rate (Certificado de Depósitos Interbancários), which was 6.40% per annum as of December 31, 2018; IGP‑M was 7.54% per annum as of December 31, 2018; TJLP
stands for Long‑term Interest Rate (Taxa de Juros a Longo Prazo), published quarterly by the Central Bank, which was 6.98% per annum as of December 31, 2018.

1,642.4  
1,324.1 
1,686.5  
1,261.7 
568.7  
3,274.9 
2,036.1  
1,358.4 
13,152.8  

126.6
196.4 
759.7  
263.3 
19.1  
569.1 
165.6  
3.8 
2,103.6  

1,264.7
807.0 
485.0  
573.8 
474.0  
2,233.2 
1,589.7  
- 
7,427.4  

127.6
148.8 
115.2  
274.8 
38.7  
217.3 
140.4  
- 
1,062.8  

6.1%

7.8%

7.9%

1.5%

3.3%

9.9%

4.3%

8.9%

Fixed rate, denominated in U.S. dollars
Total long‑term debt

Floating rate, denominated in U.S. dollars

Fixed rate, denominated in Yen

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 

As of December 31,

2018

2017

2016

22.2%
45.0%

4.3%

15.5%

13.0%

100.0%

23.3%  
48.5%  

4.6%  
14.1%  
9.5%  
100.0%  

24.3%

48.1%

4.6%

13.5%

9.5%

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.

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.

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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 2018

From  January  1,  2018  to  December  31,  2018,  we  received  reimbursements  in  the  amount  of  US$2.5  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 13(a)‑15(e), as of the year ended December 31, 2018.

As a result of this evaluation, our Chief Executive Officer and Chief Financial Officer and Investor Relations Officer concluded, that our
disclosure controls and procedures, as of December 31, 2018, were not effective due to a deficiency in the maintenance of our controls regarding
privileged access to our Information Technology (“IT”) environment, as described in item B below.

B. Management Report on Internal Control over the Preparation of Financial Reports

Our management is responsible for establishing and maintaining adequate internal control over financial reporting.

Our  internal  controls  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 Chief Executive Officer and Chief Financial Officer and Investor Relations Officer,
our  management  conducted  an  assessment  of  our  internal  control  over  financial  reporting  as  of  December  31,  2018  based  on  the  criteria
established in “Internal Control - Integrated Framework” issued by the Committee of Sponsoring Organizations of the Treadway Commission
(“COSO”) in 2013.

Based on such assessment and criteria, our management has identified control deficiency, as of December 31, 2018, that represent a material
weakness  in  our  internal  control  over  financial  reporting.  The  ineffectiveness  of  this  internal  control  has  not  resulted  in  a  misstatement  or
omission in our consolidated financial statements as of December 31, 2018 and for the year then ended

Material Weakness in Internal Control over Financial Reporting

A material weakness is a deficiency, or a combination of deficiencies, in the internal control over financial reporting, such that there is a
reasonable possibility that a material misstatement in the company’s annual or interim financial statements will not be prevented or detected on a
timely basis.

Our management has identified a service account (ERP system support) with privileged access. This account, if used improperly, could have

had access to system transactions and made undue changes.

Additionally,  this  access  control  deficiency  could  have  affected  the  effectiveness  of  business  process  automated  controls  and  manual

controls with an automated component.

Although there was a possibility of improper access, we carried out an analysis of the System Access Logs, which demonstrated that the

actions carried out were limited to those necessary to maintain the system, without any impact on our financial reporting for 2018.

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Actions for Remediation of Material Weakness

Our  management  immediately  established  actions  and  efforts  to  remediate  the  material  weakness  identified  in  relation  to  the  service

account. These actions included:

Removing the privileged access;

·
· Analyzing the access logs of the relevant account;
· Actions to ensure that privileged access occurs only on an exceptional basis and for the necessary time, subject to due justification and

based on the authorization of two managers; and
Periodic monitoring of privileged user actions.

·

Our independent registered public accounting firm has issued an attestation report on the effectiveness of our internal control over financial

reporting, as described below.

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C. Certification Report of the Independent Audit Firm

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 Internal Control Over Financial Reporting

We have audited Companhia de Saneamento Básico do Estado de São Paulo - SABESP (the Company) internal control
over  financial  reporting  as  of  December  31,  2018,  based  on  criteria  established  in  Internal  Control  –  Integrated
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion,
because  of  the  effect  of  the  material  weakness,  described  below,  on  the  achievement  of  the  objectives  of  the  control
criteria, the Company has not maintained effective internal control over financial reporting as of December 31, 2018,
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,  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United
States) (PCAOB), the statements of financial position of the Company as of December 31, 2018 and 2017, the related
statements of profit or loss, other comprehensive income, changes in equity, and cash flows for each of the years in the
three-year period ended December 31, 2018, and the related notes (collectively, the financial statements) and our report
dated April 26, 2019 expressed an unqualified opinion on those financial statements.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such
that there is a reasonable possibility that a material misstatement of the company’s annual or interim financial statements
will not be prevented or detected on a timely basis. The following material weakness has been identified and included in
management’s assessment.

· There were ineffective general information technology controls (GITC) due to the existence of a user with

privileged access to the information technology (IT) that support the Company’s financial reporting process. As a
result, business process automated controls and manual controls with an automated component were also
considered ineffective because they could have been adversely impacted.

The material weakness was considered in determining the nature, timing, and extent of audit tests applied in our audit of
the 2018 financial statements and this report does not affect our report on those financial statements.

Basis for Opinion

The Company’s management is responsible 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 Management’s
Annual Report on Internal Controls over Financial Reporting appearing under Item 15 of the Company’s Annual Report
on  Form  20-F.  Our  responsibility  is  to  express  an  opinion  on  the  Company’s  internal  control  over  financial  reporting
based on our audit. We are a public accounting firm registered with the 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  audit  in  accordance  with  the  standards  of  the  PCAOB.  Those  standards  require  that  we  plan  and
perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was
maintained in all material respects.

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  audit  also  included  performing  such  other
procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for
our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s 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
generally accepted accounting principles. A company’s 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

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transactions  and  dispositions  of  the  assets  of  the  company;  (2)  provide  reasonable  assurance  that  transactions  are
recorded  as  necessary  to  permit  preparation  of  financial  statements  in  accordance  with  generally  accepted  accounting
principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of
management  and  directors  of  the  company;  and  (3)  provide  reasonable  assurance  regarding  prevention  or  timely
detection of unauthorized acquisition, use, or disposition of the company’s 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.

/s/ KPMG Auditores Independentes

São Paulo – Brazil
April 26, 2019

D. Changes in internal control over disclosure of financial information

There have been no changes in our internal control over financial reporting that occurred during the fiscal year ended December 31, 2018

that have materially affected, 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 Ernesto Rubens Gelbcke qualifies as an “audit committee financial expert” as defined for the purposes of
this Item 16A in Item 16 of Form 20‑F.  Ernesto Rubens Gelbcke 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 called the Code of Conduct and Integrity, which 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 Conduct and Integrity, we have an Ethics Commission 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.    Recurring  cases  are  reported  to  the  Ethics  Commission,  which  urges  the  related  departments  to  develop  preventive  actions.    In
2018, 164 events were reported to the Whistle-Blower Channel.  During 2018, 48 of our employees or outsourced employees received penalties
(11 warnings, one suspension and 36 dismissals).  Our Ethics Commission is also responsible for addressing relevant inquiries and interpreting
the norms of the Code of Conduct and Integrity for all of our employees.  Our Code of Conduct and Integrity 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
Conduct  and  Integrity,  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 Conduct and Integrity, 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 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. 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,
2018. 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 and 2014. 

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 2018 and 2017:

Audit Fees(1)
Audit‑Related Fees
Tax Fees
All Other Fees(2)

Year ended December 31,

(in millions of reais)

2018

2.8
-

-
-

2017

3,0
-

-
0.0

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2.8

3.0

(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.

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(2)     Includes the amount of R$0.04 million referring to non-material, non-audit services in 2017.

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, 2017 or 2018. Deloitte

Touche Tohmatsu Auditores Independentes did not provide any non-audit services to us in 2016.

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,  we  engaged  KPMG  Auditores
Independentes as our independent registered public accounting firm on June 22, 2016.  Our financial statements as of and for the years ended
December 31, 2015 and 2014, which are not included in this annual report, were audited by Deloitte Touche Tohmatsu Auditores Independentes.

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 allowed us to implement the necessary changes to our
bylaws by June 30, 2018, as required by Federal Law No. 13,303/16.  The revisions to our bylaws were approved at our General Shareholders’
Meeting held on April 27, 2018.

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:

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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, Board of Director’s Internal Charter, Executive Board’s Internal Charter and Fiscal Council’s Internal Charter.

Additionally, we have certain corporate policies, such as the Nominating Policy for the appointment and assessment of directors, officers
and  Fiscal  Council  members,  as  well  as  the  Policy  for  Compensation  of  directors,  officers,  as  well  as  members  of  the  Fiscal  Council  and
statutory committees.

These policies also aim to comply with the Novo Mercado Regulation and the State Decree No. 62,349/2016.

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.

In view of Brazilian Law 13.303/16 and new requirements of Novo Mercado Listing Regulations, the following discussion summarizes the

significant differences between our current corporate governance practices 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.  However, they do not require that we have a majority of independent directors, as required under the NYSE rules.  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, six of our nine 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.

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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 this Law, up to one‑third of the members of the board of directors
can be elected from management.  Our bylaws provide that the CEO shall integrate the Board of Directors, while holding such position. All
other members of our board of directors meet the NYSE’s definition of “non‑management” directors.  There is no requirement in the Brazilian
Corporate  Law  that  non-management  directors  meet  regularly  without  management.  However,  the  Internal  Charter  of  the  Board  of  Directors
establishes that, by resolution of the Chairman of the Board, meetings may be held exclusively for external directors, without the presence of
executives. Our board of directors consists of seven non-management directors.

Fiscal Council

Under the Brazilian Corporate Law, the Conselho Fiscal, or fiscal council, is a corporate body independent of management and a company’s
external auditors.  The fiscal council 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 council is not equivalent to, or comparable with, a U.S. audit committee.  The primary responsibility of the fiscal
council 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  council  members  to  receive  as  compensation  at  least  10%  of  the  average  annual  amount  paid  to  a
company’s executive officers.  The Brazilian Corporate Law requires a fiscal council to be composed of a minimum of three and a maximum of
five sitting members and respective alternates.

Under the Brazilian Corporate Law, the fiscal council 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.

Currently,  our  fiscal  council  consists  of  four  sitting  members  and  his/her  alternates.  The  fiscal  council  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  and
Federal Law No. 13,303/16 (the Brazilian State-owned Companies 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 Conduct and Integrity, 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 Ernesto Rubens Gelbcke,
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. Ernesto Rubens Gelbcke 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.

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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 No. 62,349/16 established the requirement of a committee with the responsibilities of
verifying  the  nomination  process  of  the  members  of  the  management  and  of  the  fiscal  council.  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 No. 62,349/16.

This  committee  must  be  composed  of  up  to  three  members,  elected  by  a  general  shareholders’  meeting, without  a  fixed  term  of  office.
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.  Currently,  our  Eligibility  and  Advisory  Committee  is  composed  of  three  members,  which  are
representatives from our legal, human resources and compliance departments.

Candidates are assessed based on the CODEC Resolution No. 03/2018 and on our nomination policy, approved by the Board of Directors,

which follows the guidelines defined by Federal Law No. 13,303/16, State Decree No. 62,349/16 and Novo Mercado Listing Regulations.

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 is also responsible for verifying the compliance of the evaluation process of the members of the management and of the
fiscal council, as well as providing methodological and procedural support to the board of directors to evaluate the performance of officers and
other members of statutory committees.

The performance evaluation, individual and collective, held annually, of the members of the management and the members of committees,

observing the following minimum requirements, according to the terms of Federal Law No. 13,303/16:

(a) presentation of the acts of management, regarding the lawfulness and effectiveness of the management;
(b) contribution to the earnings for the year; and
(c) achievement of the purposes established in the business plan and fulfillment of the long-term strategy.

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  our
remuneration policy, approved by the Board of Directors, which follows the guidelines from the São Paulo State Government and the CODEC
(State Capital Protection Board).

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, Federal Law No. 13,303/16 and State Decree
62,349/16.  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”, our Report on Brazilian
Code of Corporate Governance and our policies available on “Corporate Governance” section of our Investor Relations website.  We believe that
such corporate governance guidelines applicable to us 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.

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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.  The adoption and disclosure of a formal code is not required
under the Brazilian Corporate Law. 

However,  Federal  Law  No.  13,303/16,  State  Decree  62,349/16  and  the  Novo  Mercado  Regulations  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 adopt and disclose a Code of Conduct and Integrity and believe that this code complies with
the requirements made by the Brazilian laws and regulations, as well as addresses the matters required to be addressed by the applicable NYSE
and SEC rules.

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  is  connected  to  the
Board of Directors through the audit committee and reports to our Chief Executive Officer. Our internal audit is responsible for evaluating (i) the
adequacy of internal controls, (ii) the effectiveness of the risk management and of the governance processes, (iii) the reliability of the process of
collecting, measuring, classifying, accumulating, recording and disclosing events and transactions, to prepare financial statements, and (iv) the
proper application of the principle of segregation of duties, to avoid the occurrence of conflicts of interest and fraud.

Anticorruption Compliance

Law  No.  12,846,  of  August  1,  2013  (the  “Anticorruption  Law”  or  the  “Clean  Company  Act”),  as  further  regulated  by  Decree  No.
8,420/2015, introduced to the Brazilian legal system the concept of strict liability for legal entities involved in harmful acts against the national
and foreign public administration, as defined in the Anticorruption Law, subjecting the violation company 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, which can be up to 20% of the company’s annual gross revenue. 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 Conduct and Integrity as well as other policies and guidelines aimed at preventing fraud, corruption
and  other  harmful  acts  against  public  administration.  In  2018,  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, as
predicted in the Brazilian legislation – and follows the recommendations of the Organization for Economic Cooperation and Development, the
United Nations Office on Drugs and Crimes, and the World Bank to establish an ethical culture.  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.

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”. 

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 September 20, 2018 (English translation) (incorporated by reference to the Form 6‑K filed on November 30, 2018).

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 Conduct and Integrity dated July 27, 2018 (English translation) (incorporated by reference to the Form 6-K filed on August 10, 2018).

Certification of Benedito Pinto Ferreira Braga Junior, 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 Benedito Pinto Ferreira Braga Junior, 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

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101.LAB

XBRL Taxonomy Extension Label Linkbase Document

101.PRE

XBRL Taxonomy Extension Presentation Linkbase Document

(*) Previously filed.

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The registrant hereby certifies that it meets all of the requirements for filing on Form 20‑F and that it has duly caused and authorized the

undersigned to sign this annual report on its behalf.

SIGNATURES

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO ‑
SABESP

By:         /s/ Benedito Pinto Ferreira Braga Junior           
Name:      Benedito Pinto Ferreira Braga Junior
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:  April 26, 2019

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Companhia de Saneamento Básico do Estado de São Paulo -
SABESP

Financial Statements as at December 31, 2018 and 2017
And for the years ended
December 31, 2018, 2017 and 2016

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

We have audited the accompanying Statements of financial position of Companhia de Saneamento Básico do Estado de
São Paulo – SABESP (the Company) as of December 31, 2018 and 2017, the related statements of profit or loss, other
comprehensive income, changes in equity, and cash flows for each of the years in the three year period ended December
31, 2018, and the related notes (collectively, the financial statements). In our opinion, the financial statements present
fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results
of its operations and its cash flows for each of the years in the three year period ended December 31, 2018, in
conformity with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards
Board (IASB).

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United
States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria
established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of
the Treadway Commission, and our report dated April 26, 2019 expressed an adverse opinion on the effectiveness of the
Company’s internal control over financial reporting.

Basis for Opinion

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 audits. We are a public accounting firm registered with the 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 audit to obtain reasonable assurance about whether the financial statements are free of material
misstatement, whether due to error or fraud. Our audits 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. We believe that our audits
provide a reasonable basis for our opinion.

We have served as the Company’s auditor since 2016.

/s/ KPMG Auditores Independentes

São Paulo – SP

April 26, 2019

F-2

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statement of Financial Position as of December 31, 2018 and 2017
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
   Water National Agency – ANA
   Other receivables

   Investments
   Investment properties
   Contract asset
   Intangible assets
   Property, plant and equipment

Note

7
9 (a)
10 (a)

8
18 (a)

9 (a)
10 (a)

11

12
13
14
15
16

Total noncurrent assets

Total assets
The accompanying notes are an integral part of these financial statements.

F-3

December 31, 2018

December 31, 2017

3,029,191
1,843,333
174,148

65,596
31,900
380,703
77,371

5,602,242

209,083
669,102
152,018
49,136
103,310

44,587
47,620
7,407,948
29,012,460
267,612

37,962,876
43,565,118

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

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statement of Financial Position as of December 31, 2018 and 2017
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, 2018

December 31, 2017

17

18 (b)
24 (c)
20 (a)
22
15 (g)
15 (c) (iv)

17
19

20 (a)
21 (b)
15 (g)
15 (c) (iv)

24

F-4

465,993
2,103,612
564,830
200,563
673,765
458,387
454,022
137,827
230,695
108,938
5,398,632

11,049,184
261,242
140,830
434,475
2,970,009
3,275,297
142,314
341,447

18,614,798

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
215,718

17,261,555

24,013,430

22,033,435

15,000,000
5,100,783
(549,095)
19,551,688
43,565,118

10,000,000
8,051,110
(538,101)
17,513,009
39,546,444

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Income Statements for the
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Net operating income

      Cost of services

Gross profit

      Selling expenses

Allowance for doubtful accounts

      Administrative expenses

      Other operating income (expenses), net

Equity 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

2018

2017

2016

28 (b)

29

16,085,094
(9,086,456)

14,608,233
(8,778,963)

14,098,208
(9,013,120)

29
29
29
31

12

30
30

30

6,998,638

5,829,270

5,085,088

(693,480)
(166,727)
(996,877)
28,591
6,510

(686,012)
(82,681)
(1,098,990)
(5,679)
5,760

(639,559)
(90,488)
(934,896)
4,722
4,740

5,176,655

3,961,668

3,429,607

(807,967)
446,302
(902,671)

(688,280)
326,244
(96,018)

(839,891)
448,710
1,090,628

(1,264,336)

(458,054)

699,447

Profit before income tax and social contribution

3,912,319

3,503,614

4,129,054

Income tax and social contribution
      Current

      Deferred

19 (d)

19 (d)

(852,655)
(224,596)

(882,787)
(101,517)

(1,121,289)
(60,667)

(1,077,251)

(984,304)

(1,181,956)

Profit for the year

Earnings per share – basic and diluted (in reais)

25

2,835,068

2,519,310

2,947,098

4.15

3.69

4.31

The accompanying notes are an integral part of these financial statements.

F-5

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Comprehensive Income for the
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais

Profit for the year

2,835,068

2,519,310

2,947,098

 Other comprehensive income (loss)

(10,994)

287,547

(472,266)

Note

2018

2017

2016

      Items which will not be subsequently reclassified to the income
statement:

      Actuarial gains and (losses) on defined benefit plans

21 (b)

(10,994)

287,547

(472,266)

Total comprehensive income for the year

2,824,074

2,806,857

2,474,832

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 Changes in Equity for the
Years ended December 31, 2018, 2017 and 2016
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

784,955

3,273,580

11,453

-

(353,382)

13,716,606

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Balances as of December 31, 2015

   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

21 (b)

24 (d)

24 (c)

24 (c)

-

-

-

-

-

-

-

-

   Transfer to investments reserve

Balances as of December 31, 2016

-
  10,000,000

-

-

-

147,355

-

-

-

-

-

   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

Balances as of December 31, 2017

   Net income for the year

   Actuarial gains (losses)

   Total comprehensive income for the year

   Legal Reserve

21 (b)

24 (d)

24 (c)

24 (c)

24 (c)

-

-

-

-

-

-

-

-

-

-

-

125,965

-

-

-

-

-
-
  10,000,000 1,058,275

21 (b)

24 (d)

-

-

-

-

-

-

-

141,755

   Investments reserve capitalized

24 (a)

5,000,000

   Interest on capital (R$0.9851 per share)
   2016 additional proposed dividends, approved
(R$0.07833 per share)

   Additional proposed dividends
      Withholding  income  tax  on  interest  on  capital
attributable as minimum mandatory dividends

   Transfer to investments reserve

24 (c)

24 (c)

24 (c)

24 (f)

-

-

-

-

-

-

-

-

-

-

-

2,947,098

-

2,947,098

-

(472,266)

(472,266)

2,947,098

(472,266)

2,474,832

-

-

-

-

-

(11,453)

123,557

(147,355)

(699,936)

-

(123,557)

-

-

-

-

-

-

-

(699,936)

(11,453)

-

(60,838)

-

(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

-

-

-

-

-

2,519,310

(125,965)

(598,336)

(62,719)

-

105,543

(105,543)

(52,004)

-

287,547

2,806,857

-

-

-

-

-

-

-

(598,336)

(62,719)

-

(52,004)

-

(10,994)

2,824,074

-

-

-

-

-

-

-

-

-

(673,328)

(53,539)

-

(58,528)

-

1,689,466

-

(1,689,466)

6,939,296

53,539

-

(538,101)

17,513,009

2,835,068

-

2,835,068

-

(10,994)

(10,994)

-

-

-

-

(5,000,000)

-

-

-

-

-

-

-

-

-

-

(53,539)

118,859

(58,528)

2,835,068

(141,755)

-

(673,328)

-

(118,859)

-

1,901,126

-

(1,901,126)

3,840,422
Balances as of December 31, 2018
The accompanying notes are an integral part of these financial statements.

15,000,000 1,200,030

60,331

-

(549,095)

19,551,688

F-7

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Cash Flows for the
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais                                                                                                                                                                            

Cash flow from operating activities
    Profit before income tax and social contribution

December 31,
2018

December 31,
2017

December
31,
2016

3,912,319

3,503,614

4,129,054

 Adjustments for:
    Depreciation and amortization
    Residual value of property, plant and equipment, intangible assets and investment properties written-off
    Bad debt expense
    Agreement signed with the municipality of Guarulhos
    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

1,392,541
24,974
165,433
(928,014)
111,940
-
563,902
982,072
30,103
(64,046)
(289,321)
(63,013)
80,245
(6,510)
135,735
-
243,569
            33,349

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

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 contract asset and intangible assets
   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

6,325,278

5,878,323

4,945,074

(71,679)
39,919
20,075
(104,118)
(1,639)
11,760

(176,826)
(89,988)
(103,488)
(4,829)
10,648
(297,282)
(217,000)
122,214
5,463,045

(732,048)
(888,077)
3,842,920

(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)
4,910,079

(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
4,773,273

(676,087)
(932,110)
3,301,882

(739,944)
(1,029,737)
3,003,592

(2,132,559)
(13,078)
(1,136)
(50,645)
8,131
(2,189,287)

(1,957,780)
5.256
-
(18,920)
-
(1,971,444)

(2,108,167)
5,078
-
(27,631)
-
(2,130,720)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Statements of Cash Flows for the
Years ended December 31, 2018, 2017 and 2016
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 used in financing activities

December 31,
2018

December 31,
2017

December 31,
2016

1,634,553
(1,678,748)
(653,393)
(178,333)
(31,568)

(907,489)

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)

Increase in cash and cash equivalents

746,144

396,826

247,007

Represented by :
Cash and cash equivalents at the beginning of the year
Cash and cash equivalents at the end of the year
Increase in cash and cash equivalents

2,283,047
3,029,191
746,144

1,886,221
2,283,047
396,826

1,639,214
1,886,221
247,007

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, 2018, 2017 and 2016
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, 2018, the Company operated water and sewage services in 369 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 369 municipalities. The municipalities of Guarulhos and Aguaí signed contracts on December of 2018,
however their operations will begin only in 2019 (in January and June, respectively). As of December 31, 2018, the Company
had 373 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, 2018 (R$4,345 as
of December 31, 2017).

As of December 31, 2018, 35 concession agreements (51 as of December 31, 2017) had expired and are being negotiated. From
2019  to  2030,  31  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,  2018,  307  program  and  services  contracts  were  signed  (287  contracts  as  of  December  31,
2017).

As of December 31, 2018, the carrying amount of the underlying assets used in the 35 concessions of the municipalities under
negotiation totaled R$4,485,203, accounting for 12.32% of the total of intangible assets, and the related gross revenue for the
year ended December 31, 2018 totaled R$1,035,906, accounting for 6.07% of the total of gross revenue.

The Company’s operations are concentrated in the municipality of São Paulo, which represents 51.52% of the gross revenues as
of December 31, 2018 (55.38% as of December 31, 2017 and 55.46% as of December 31, 2016) and 46.97% of intangible assets
(46.92% on December 31, 2017).

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, 2018, 2017 and 2016
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:

protection of the sources of water in collaboration with other agencies of the State and the City;
capture, transport and treatment of water;
collect, transport, treatment and final dispose of  sanitary sewage; and

i.
ii.
iii.
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,  2018  totaled  R$  326.276  (R$294,658  as  of  December  31,  2017  and
R$280,689  as  of  December  31,  2016)  and  the  intangible  asset  was  R$307,566  in  the  year  ended  December  31,  2018
(R$310,577 as of December 31, 2017). 

Public deeds are valid and governed by the Brazilian Civil Code.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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  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. Inaugurated in April 2018, the São Lourenço Production System expand water production and
capacity by 6.4 m³/s. With the conclusion of this system the Company has 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 improved water security, due to the works carried out, 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.

The financial statements were approved by Management on April 25, 2019.

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, 2018, 2017 and 2016
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, except for the adoption of new accounting standards as described below.

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

As of December 31, 2017, the Company classified 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, 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.

·     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.

Starting January 1, 2018, the Company adopted IFRS 9, which establishes principles for the financial reporting of financial assets
and financial liabilities involving all three accounting aspects: classification and measurement, impairment and hedge accounting.

As of December 31, 2018, the Company classifies its financial assets according to the following categories: measured at amortized
cost,  measured  at  fair  value  through  other  comprehensive  income  and  measured  at  fair  value  through  profit  or  loss.  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, 2018, the Company did not have financial assets classified as fair value through
other comprehensive income and fair value through profit or loss.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

·         Amortized cost

This comprises financial assets that meet the following conditions: (i) it is held within the business model whose objective is to hold
financial assets to collect contractual cash flows; and (ii) the contractual terms of the financial asset give rise, on specified dates, to
cash flows that are solely payments of principal and interest on the principal amount outstanding.

Presented as 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 financial assets measured at amortized cost include cash and cash equivalents, restricted cash,
balances  of  trade  receivables,  accounts  receivable  from  related  parties,  other  receivables,  receivables  from  the  Water  National
Agency – ANA. Financial assets measured at amortized cost are recorded at fair value and subsequently at amortized cost, under
the effective interest rate method.

Financial Liabilities - Classification

As  of  December  31,  12  2017,  the  Company  classified  its  financial  liabilities  into  the  following  categories:  measured  at  fair  value
through profit or loss and amortized cost.  Classification depends on the purpose to which the financial liabilities were assumed. As
of December 31, 2017, the Company did not have liabilities classified into the “fair value through profit or loss” category.

·         Amortized cost

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.

As of December 31, 2018, with the adoption of IFRS 9, the Company classifies its financial liabilities measured at amortized cost.
Classification depends on the purpose to which the financial liabilities were assumed. 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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

Impairment

IFRS 9 – Financial Instruments introduces a new impairment model, replacing the incurred loss model for the expected credit loss
model, which requires the recording of provision upon initial recognition of asset exposed to credit risk.

Trade receivables

Due  to  the  caractheristics  of  the  Company’s  accounts  receivable  such  as  (i)  insignificant  financial  component,  (ii)  non-complex
receivables portfolio, and (iii) low credit risk, the Company adopted the simplified approach of expected credit loss, which consists
in recognizing expected credit loss based on the total asset’s useful life.

As of December 31, 2017, the methodology to calculate the allowance for doubtful accounts was carried out based on historical
loss.  The  methodology  used  consisted  of  using  an  estimate  per  maturiry  range  through  the  average  weighted  loss  of  the  last  12
months. The calculation also considered a segregation of clients by nature and maturity date. The Company also concluded that
the  macroeconomic  indicators  did  not  have  significant  impact  on  its  estimates.  In  order  to  support  this  understanding,  the
Company  carried  out  several  analyses  of  the  correlation    between  indicators  that  could  potentially  have  some  influence  the
sanitation sector and its history of losses on doubtful accounts, such as Gross Domestic Product (GDP), Unemployment Rate and
the Extended Consumer Price Index (IPCA).

After  analysis,  the  Management  concluded  that  the  methodology  already  adopted  by  the  Company  complies  with  the  expected
credit loss model and, for this reason, the first-time adoption of IFRS 9 as from January 1, 2018 did not have significant impacts
on the measurement of allowance for doubtful accounts.

Deposit transactions and financial investments measured at amortized cost

The Company analyzes changes in the rates of investments in bank deposits certificates and information obtained from regulatory
agencies about the financial institutions. The likelihood of delinquency over 12 months and during the terms of these investments
was based on historical data provided by credit rating agencies for each credit level and analyzed in terms of sensitivity based on
current returns.

These deposits and financial investments are subject to an insignificant risk of change in value.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

3.3  Operating income

(a)         Revenue from sanitation services

Revenue from water supply and sanitation services are recognized as the water is consumed and services are provided. Revenues,
including 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,  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.  The  average  term  between  the  issue  and  the  maturity  of  the  bill  is  ten  business  days.
Concerning revenues of wholesale municipal governments (wholesale sale), which do not pay the full invoice, the Company records
allowance for doubtful accounts upon invoicing in revenue reduction account.

As  of  December  31,  2017,  the  Company  recognized  revenue  when:  i)  products  were  delivered  or  services  were  rendered;  ii)  the
amount of revenue could be reliably measured, iii) it was probable that future economic benefits would flow to the Company, and
iv) it was probable that the amounts will be collected.  The amount of revenue was not considered to be reliably measurable until all
conditions relating to the sale had been satisfied.  Amounts in dispute were recognized as revenue when collected.

As of December 31, 2018, with the adoption of IFRS 15, since 1 January, 2018, which establishes a five-step model applicable over
revenue from a contract with a customer, as a result, the Company started to recognize revenue when: i) it identifies the contracts
with customers; ii) it identifies the different obligations in the contract; iii) it determines the transaction price; iv) it allocates the
transaction  price  to  the  performance  obligations  in  the  contracts;  and  (v)  it  satisfies  all  performance  obligations.  Amounts  in
dispute are recognized as revenue when collected.

The Company analyzed sales transactions to private sector, government entities and wholesale customers and concluded IFRS 15
did not have significant impacts.

The Company adopted IFRS 15 using the cumulative effect method, with application and recognition as from first-time adoption,
i.e. January 1, 2018. Consequently, the Company did not apply the requirements of IFRS 15 for comparison purposes. Accordingly,
data relating to 2017 is presented based on information previously reported  and prepared in accordance with IAS 18 Revenue and
related interpretations.

(b)         Construction revenue

As of December 31, 2017, revenue from concession construction contracts was recognized in accordance with IFRIC 12 (Concession
Arrangements)  and  IAS  11  (Construction  Contracts),  using  the  percentage-of-completion  method,  provided  that  the  applicable
conditions for application were fulfilled, with non-cash effect.  The percentage of completion was 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
was 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, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

As of December 31, 2018, revenue from concession construction contracts is recognized in accordance with IFRS 15 (Revenue from
Contracts with Customers) and IFRIC 12 (Concession Contracts), as all performance obligations are satisfied over time. During the
construction of the contract, an asset is classified as contract asset, as the Company estimates that the fair value of its consideration
is equivalent to expected construction costs plus margin (the effects from the first-time adoption of IFRS 15 are presented according
to  Note  4.1).  The  fee  represents  the  additional  margin  related  to  the  work  performed  by  the  Company  in  relation  to  such
construction contracts and it is added to construction costs, resulting in the construction revenue.

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, existing
guarantees, and as from January 1, 2018, with the adoption of IFRS 9, it considers expected future 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

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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,  as  applicable.
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.

Depreciation is calculated using the straight-line method to allocate their cost and is described in Note 16(c). .

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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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:

(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 (b).

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, in cases where there is the 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/program are described in Note 16 (c).

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

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  and  financing  are  initially  recognized  at  fair  value,  upon  receipt  of  funds,  net  of  transaction  costs.    Subsequently,
borrowings and financing are stated at amortized cost, as presented in Note 17.  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

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Borrowings  and  financing  are  initially  recognized  at  fair  value,  upon  receipt  of  funds,  net  of  transaction  costs.    Subsequently,
borrowings and financing are stated at amortized cost, as presented in Note 17.  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
borrowings, 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 borrowings
effective on the capitalization date.

For  foreign  currency-denominated  borrowings  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

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 20.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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. 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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

3.18  Taxes on revenues

Revenues  from  sanitation  services  are  recognized  on  accrual  basis  for  PASEP  and  Cofins,  calculated  at  the  rates  of  1.65%  and
7.60%, respectively. 

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.

These taxes are calculated by the non-cumulativeness regime and presented net, as deductions from gross revenues.  Tax debts
calculated over “other operating income” are presented as deductions from the respective operating income.

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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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  commitments.  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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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, 2018

New standards and revisions

Standard

Description

Impact

IFRS 9 - Financial Instruments

Changes in the classification and
measurement requirements, mainly for
impairment and hedge accounting.

IFRS 15 - Revenue from Contracts with
Customers

Amendments to IFRS 2 – Classification
and measurement of share-based payment
transactions

Amendments to IAS 40 – Transfers of
investment properties

Establishes a single comprehensive
framework to determine if and when a
revenue is recognized and how revenue is
measured.

IFRS 15 supersedes the current revenue
recognition guidance including IAS 18
Revenue, IAS 11 Construction Contracts
and IFRIC 13 Interpretation A – Customer
Loyalty Programmes.

Describe about modifications of settled
options of shares.

The amendments clarify that a transfer to
or  from  investment  properties  require  an
assessment  of  whether  a  property  match,
or  no  longer  match,  the  definition  of
supported  by
investment  properties, 
observable  evidence  of  a  change  in  use,
and  that  a  change  in  use  is  possible  for
properties under construction.

Annual improvements to IFRSs: 2014-
2016 cycle
Amendments to IAS 28 Investments in
Associates and Joint Ventures

IFRIC 22 – Foreign Currency
Transactions and Advance Consideration

The  amendments  clarify  that  the  option
made  by  a  venture  capital  organization
and  other  similar  entities  to  measure
investments 
joint
ventures  at  fair  value  through  profit  or
loss 
for  each
associate or joint venture, and this choice
should be made in the inception.

is  separately  available 

in  associates  and 

Describes how the transaction date should
be  defined  in  order  to  determine  the
exchange  rate  applicable  to  the  initial
recognition of an asset, expense or income
when  the  consideration  of  that  item  has
been  paid  or  received  in  advance  in
foreign 
the
recording  of  non-monetary  assets  and
liabilities.

currency, 

resulting 

in 

Except for the impact of the disclosure of
allowance for doubtful accounts in the
income statements, which is
demonstrated as a separate item, the
application of this standard did not
impact materially the disclosures or
amounts recognized in the annual
financial statements.

(*) See impact analysis below.

The application of this amendment 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.

The application of this amendment did
not impact the disclosures or amounts
recognized in the annual financial
statements.

The application of this interpretation did
not impact the disclosures or amounts
recognized in the annual financial
statements.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(*) IFRS 15 – Revenue from Contracts with Customers

As established by IFRS 15 - Revenue from Contracts with Customers, assets related to the concession under construction, recorded
under  the  scope  of  IFRIC  12  -  Service  Concession  Arrengements,  should  be  classified  as  Contract  Asset  during  the  construction
period and transferred to Intangible Assets only after completion of the works.

With the adoption of this new accounting standard, SABESP started to record the Contract Asset in the balance sheet. This amount
was previously recognized as part of Intangible Assets and was, therefore, reclassified, with no impact in the income statement. Due
to the transition methods adopted by the Company in the application of this standard, the comparative information of the financial
statements was not restated and the impact of the adoption on January 1, 2018 is as follows:

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
   Water National Agency – ANA

   Other receivables

   Investments
   Investment properties
   Contract asset
   Intangible assets
   Property, plant and equipment

Total noncurrent assets

Total assets

Note

January 1, 2018

Impact of IFRS 15

January 1, 2018

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

-
-
-

-
-
-
-

-

-
-

-
-

-

-
-
10,387,715
(10,387,715)
-

-
-

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
10,387,715
23,078,417
255,050

34,972,359
39,546,444

7
9 (a)
10 (a)

8
18 (a)

9 (a)
10 (a)

11

12
13
14
15
16

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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 16 – Leases1

IFRIC 23 – Uncertainty
over Income Tax
Treatments1

Establishes a single model for the accounting of leases in
the balance sheet for lessees. 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.

Clarify accounting when there are uncertainties about the
treatment of taxes on profit.

(**) See impact analysis below.

The Company is assessing the
impacts and effects of the
amendments, however it does not
expect material effects from
adopting this standard.

1 Effective for annual periods beginning on or after January 1, 2019.

(*) IFRS 16 – Leases

The new standard supersede IAS 17 - "Leases" and corresponding interpretations, introducing significant changes to lessees, as it
requires lessess to recognize the liability of future payments and the right of use of leased assets to virtually all leases agreements,
including operating leases, specific short-term contracts or contracts with small amounts may be excluded from the scope of this
new standard.

The Company’s financial statements will be impacted as follows:

a)  recognition  of  right-of-use  assets  and  lease  liabilities  in  the  statement  of  financial  position,  initially  measured  at  the  present
value of future lease payments;

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

b) recognition of amortization expenses of right-of-use assets and interest expenses on lease liabilities in the income statement;
and

c)  segregation  of  the  total  cash  paid  in  these  transactions  between  principal  (recorded  in  financing  activities)  and  interest
(recorded in operating activities) in the statement of cash flows.

SABESP  will  apply  the  requirements  of  IFRS  16  as  of  the  fiscal  year  beginning  on  January  1,  2019.  To  this  end,  the  transition
method selected by the Company was the modified retrospective approach, whereby the amount referring to the Right-of-Use Asset
(“Lease Asset”) equals to the Lease Liability, without the cumulative effect of the initial application of this new standard recorded as
an adjustment to the opening balance of the equity and without the restatement of comparative periods.

The new lease definitions were applied to all contracts in effect on the transition date. The change in the definition of a lease refers
mainly to the concept of control. IFRS 16 establishes whether a contract contains a lease based on the fact that customer has the
right to control the use of an identified asset for a defined period of time in exchange of consideration.

The  Company's  Management  analyzed  the  contracts  (out  of  a  total  of  approximately  20,000  contracts),  evaluating  whether  they
contained leases in accordance with IFRS 16. This analysis identified impacts mainly related to vehicles and properties leased from
third  parties,  corresponding  to  approximately  95%  of  the  total  amount,  and  less  representative  amounts  arising  from  other
transactions in which we identified assets leased individually or in combination in service contracts.

The recognition of lease expenses of short-term leases (12 months or less) and leases of low-value assets (below US $ 5,000.00) will
remain on a linear basis as permitted by IFRS 16.

On January 1, 2019, the measurement of lease liabilities corresponds to the total of fixed lease payments, adjusted to present value,
considering an incremental rate on borrowings, which corresponds to the average rate applicable to borrowings or debt issues in
the local capital market, which represent the financing of these assets classified as right of use, allocating the assets based on useful
life at the average rate per maturity term of each borrowing contract.

The Company decided to use the practical expedient of using a single real discount rate based on the respective terms for contracts
with similar characteristics.

Regarding  renewals,  the  Company  considered  the  assumptions,  policies  and  internal  regulations,  whose  term  cannot  be
automatically renewed, and for which extensions will only occur based on an agreement between the parties in cases proven to be
advantageous and necessary to attain SABESP’s interests, i.e., when it is reasonable sure that the option will be exercised.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

After carrying out analysis, the Company concluded that only 70 agreements will fall under the scope of IFRS 16, and, on January 1,
2019, the Company's Management will recognize a right-of-use asset and a lease liability at the present value of R$ 64,955.

As  of  December  31,  2018,  the  analyses  and  internal  controls  associated  with  the  measurement  and  accounting  of  the  lease
agreements were substantially concluded and under customization, with conclusion pending the definition of certain assumptions.
Therefore,  considering  the  existence  of  significant  judgment  components  in  the  new  accounting  pronouncement,  the  Company
believe that there may be changes in the reported amounts, but in amounts deemed not significant with the context of the financial
statements.

The Company intends to apply the practical expedient related to the definition of leases during transition. This means that it will
apply IFRS 16 to all agreements signed before January 1, 2019 identified as lease, in accordance with IAS 17 and IFRIC 4.

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.

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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 US dollar and Yen, in the total amount of R$ 6,694,912 as of
December 31, 2018 (R$5,702,375 as of December 31, 2017). Below, the Company’s exposure to exchange risk:

December 31, 2018
Foreign
currency

R$

December 31, 2017
Foreign
currency

R$

Borrowings and financing – US$

Borrowings and financing – Yen

1,191,152

57,463,173

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 17)

4,615,476

2,026,726

40,193

12,517

6,694,912

(22,390)

(3,113)

6,669,409

1,200,786

3,972,200

57,575,271

1,692,713

26,628

10,834

5,702,375

(26,454)

(3,100)

5,672,821

The 17.6% increase in foreign currency-denominated debt from December 31, 2017 to December 31, 2018 was mainly due to:

Exchange rates, as a result of:

1)         17.6% increase of the US dollar against the real, from R$3.3080 as of December 31, 2017 to R$3.8748 as of December 31,

2018; and

2)                 20.0% increase of the Yen-denominated, from R$0.02940 as of December 31, 2017 to R$0.03527 as of December 31,

2018.

As of December 31, 2018, if the Brazilian real had depreciated or appreciated by 10 percentage points, 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$669,491 (R$570,238 as of December 31, 2017), lower or higher, mainly as a result of exchange losses or gains
on the translation of foreign currency-denominated loans.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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, 2018

December 31, 2017

CDI(i)
TR(ii)
IPCA(iii)
TJLP(iv)
LIBOR(v)

Interest and charges

Total

1,250,000

1,637,290

1,614,595

1,322,854

3,259,295
134,725

9,218,759

1,144,391

1,574,564

1,699,747

1,354,987

2,814,399
125,172

8,713,260

(i) CDI – (Certificado de Depósito Interbancário), an interbank deposit certificate
(ii) TR – Interest Benchmark Rate
(iii) IPCA – (Índice Nacional de Preços ao Consumidor Amplo), a consumer price index
(iv) TJLP – (Taxa de Juros a Longo Prazo), a long-term interest rate index
(v) LIBOR – London Interbank Offered Rate

Another risk to which the Company is exposed, is the mismatch of monetary restatement indices of its debts with those of its service
revenues. Tariff adjustments of services provided by the Company do not necessarily follow the increases in the inflation indexes to
adjust loans, financing and interest rates affecting indebtedness

As of December 31, 2018, 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 before taxes would have been R$ 92,188 
(R$  87,133  as  of  December  31,  2017)  lower  or  higher,  mainly  as  a  result  of  lower  or  higher  interest  expense  on  floating  rate
borrowings and financing.

(b)      Credit risk

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

The  maximum  exposures  to  credit  risk  as  of  December  31,  2018  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 bank’s default rates. The credit
quality of the banks, such as deposits and financial investments, the Company considers the lower rating published by three main
international rating agencies (Fitch, Moody's and S&P), according to internal policy of market risk management:

Cash at banks and short-term bank deposits

AA+(bra)

AAA(bra)

Other (*)

December 31, 2018

December 31, 2017

2,966,080

45,430

17,681

3,029,191

2,222,001

43,978

17,068

2,283,047

(*) This category includes current accounts and investment funds in banks whose balances were not significant, and after assessing
the impact of IFRS 9, concluded that expected losses are not material.

The available credit rating information of the banks, as at December 31, 2018, in which the Company made deposit transactions
and financial investments in local currency (R$ - domestic rating) during the year is as follows:

Banks

Banco do Brasil S/A

Banco Santander Brasil S/A

Brazilian Federal Savings Bank

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

-

brAAA

brAAA

brAAA

brAAA

The Company's liquidity is primarily reliant upon cash provided by operating activities, loans from Brazilian

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

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 installments of principal and
future  interest  to  be  paid  according  to  the  agreement.  Future  interest  was  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.

As of December 31, 2018

2019

2020

2021

2022

2023

2024
onwards

Total

Liabilities

Borrowings and financing

2,581,359

3,073,006

1,427,558

1,468,221

1,189,927

6,364,235

16,104,306

Accounts payables to suppliers and contractors

Services payable

Public-Private Partnership – PPP

Program contract commitments

Cross default

465,993

454,022

405,263

244,446

-

-

-

-

-

-

-

-

-

-

465,993

454,022

377,196

45,608

377,196

45,741

377,196

30,991

377,196

4,889,573

6,803,620

30,991

14,417

412,194

The Company has borrowings and financing agreements including cross default clauses, e.g., 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.

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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Total borrowings and financing (Note 17)

(-) Cash and cash equivalents (Note 7)

Net debt

Total equity

Total capital

Leverage ratio

December 31, 2018

December 31, 2017

13,152,796

(3,029,191)

10,123,605

19,551,688

12,100,966

(2,283,047)

9,817,919

17,513,009

29,675,293

27,330,928

34%

36%

As of December 31, 2018, the leverage ratio decreased to 34% from the 36% as of December 31, 2017, mainly due to the increase in
equity generated by the 2018 earnings retention, mitigated by the increase of the net debt mainly as a result of the appreciation of
the dollar (17.1%) and the yen (20.0%) against the real.

5.3 Fair value estimates

The Company considers 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, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

4 Financial instruments

With  the  changes  introduced  by  IFRS  9  (Financial  Instruments),  as  of  December  31,  2018,  the  Company  did  not  have  financial
assets classified as fair value through other comprehensive income and fair value through profit or loss. The Company’s financial
instruments  included  in  the  amortized  cost  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, 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  non-derivative  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, 2018

December 31, 2017

Carrying amount

Fair value

Carrying amount

Fair value

3,029,191

31,900

2,052,416

49,136

180,681

3,029,191

31,900

2,052,416

49,136

180,681

2,283,047

2,283,047

18,822

18,822

1,888,505

1,888,505

70,487

169,715

70,487

169,715

Additionally, SABESP has financial instrument assets receivables from related parties, in the amount of R$843,250 as of December
31, 2018 (R$815,160 as of December 31, 2017), 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$737,503  (R$709,208  as  of  December  31,  2017),  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, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Financial liabilities

December 31, 2018

December 31, 2017

Carrying amount

Fair value

Carrying amount

Fair value

   Borrowings and financing

13,152,796

13,116,684

12,100,966

11,967,909

   Accounts payables to suppliers and contractors

   Services payable

   Program contract commitments

465,993

454,022

373,009

465,993

454,022

373,009

344,947

408,275

239,500

344,947

408,275

239,500

   Public-Private Partnership - PPP

3,413,124

3,413,124

3,071,416

3,071,416

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.

(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,
2018.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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, 2018.

(vii)Leases are financial instruments considered by face value restated until maturity date, whose characteristic is the indexation by

fixed contractual rate.  Thus, the Company discloses as market value, the amount recorded as of December 31, 2018.

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  and  expectation  of  future  losses.  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, 2018, 2017 and 2016
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, upon  completion of the construction
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 15.

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 21.

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.

(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.  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, 2018, 2017 and 2016
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 19.

(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 recognizes 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 20.

7             Cash and cash equivalents

Cash and banks

Cash equivalents

December 31, 2018

December 31, 2017

151,558

2,877,633

3,029,191

171,951

2,111,096

2,283,047

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 98.28% of CDI in December 2018 (98.88% in December 2017).

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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, 2018

December 31, 2017

19,977

5,880

6,043

31,900

12,055

1,209

5,558

18,822

(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)

Mogi das Cruzes

São Caetano do Sul

Total wholesale customers – Municipal governments

Unbilled supply

Subtotal

Allowance for doubtful accounts

Total

Current

Noncurrent

December 31, 2018

December 31, 2017

1,372,667
347,679

1,720,346

575,733

3,876
274,906

854,515

3,056

2,869

5,925

571,072

3,151,858
(1,099,442)

2,052,416

1,843,333
209,083

2,052,416

1,248,979
320,032

1,569,011

532,320

3,547
285,614

821,481

2,670

2,604

5,274

560,712

2,956,478
(1,067,973)

1,888,505

1,672,595
215,910

1,888,505

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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.

Wholesale customers – Municipal governments: (iv)
Guarulhos (*)
Mauá
Mogi das Cruzes
Santo André
São Caetano do Sul
Diadema
Total wholesale customers – Municipal governments

-
601,910
 3,056
1,164,399
2,869
222,671
1,994,905

760,598
530,830
2,670
1,048,832
2,604
222,671
2,568,205

(iv)  Wholesale  basis  customers  -  municipal  governments  -  This  balance  refers  to  invoices  issued  as  a  result  of  services
provided 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.  The  Company  has  not  recognized  revenue  nor
receivables from these municipalities according to the IFRS 15/IFRS 9, since it does not consider that it will be probable
that it will collect the consideration to which it is entitled in exchange for the services transferred to the municipalities.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(*) Agreement with the municipality of Guarulhos

On December 12, 2018, an Agreement for debt payment and receipt was entered into by the municipality of Guarulhos
(“Guarulhos”),  the  Guarulhos  Autonomous  Water  and  Sewage  Service  (SAAE)  and  SABESP,  in  order  to  settle  SAAE’s
existing debt through the transfer of sanitation services to SABESP for a period of 40 years.

On  December  12,  2018,  the  São  Paulo  State,  the  city  of  Guarulhos  and  SABESP,  with  intervention  of  SAAE,  signed  a
Public Utility Service Agreement to Provide Water Supply and Sewage Services in the municipality of Guarulhos, through
which the São Paulo State and the municipality of Guarulhos granted SABESP the right to provide services for a period of
40 years.

Due to the signature of the service agreement, the amount due by SAAE, recorded as revenue loss, totaling R$ 928,014,
was recognized as revenue, reducing losses in receivables. As a result, the balance of receivables was used to pay for the
transfer of sanitation services for a 40-year period, incorporated into intangible assets.

Due  to  the  service  transfer,  the  Company  paid  R$  50,000  to  settle  administrative  costs  and  terminate  the  services
provided by SAAE. It also allocated R$ 150,000 to be transferred in five annual statements, adjusted by the IPCA index
published  by  the  Brazilian  Institute  of  Geography  and  Statistics  (IBGE);  the  first  installment  was  paid  in  2018  and  the
others will be paid from January 2020 to January 2023. The amounts must be allocated to sanitation initiatives. The total
amount  of  R$  200,000  was  adjusted  to  present  value  and  registered  in  intangible  assets  by  crediting  current  and
noncurrent liabilities, in the amounts of R$ 80,000 and R$ 98,301, respectively.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

From the sixth year after the signature of the agreement, four percent (4%) of gross revenue received by SABESP from the
municipality  of  Guarulhos,  less  Cofins/Pasep,  ARSESP’s  Regulation,  Control  and  Oversight  Fee  (TRCF)  and  other
taxes/fees  levied  on  revenue  will  be  invested  in  environmental  sanitation,  housing,  drainage  and  other  urban
infrastructure projects of the municipality of Guarulhos.

Credits  in  court,  in  the  form  of  Court-Order  Debt  Security,  will  be  held  as  collateral  of  compliance  with  the  Settlement
Agreement. The payment of said Court-Order Debt Security held in court will be suspended for the period in which the
Agreement remains in effect.

The collateral amount will be progressively reduced according to the following rules:

· The collateral amount will not be reduced until the fifth (5th) anniversary of the Agreement signature date;
· From the fifth (5th) to the fifteenth (15th) anniversary of the Agreement signature date, Credits 1 and 2 will be reduced by an

amount equivalent to 1/120 per complete month;

· From the fifteenth (15th) to the twenty-third (23rd) anniversary of the Agreement signature date, Credits 3 and 4will be reduced

by an amount equivalent to 1/96 per complete month;

· From the twenty-third (23rd) to the fortieth (40th) anniversary of the Agreement signature date, Credit 5 will be reduced by an

amount equivalent to 1/204 per complete month.

(b)      The aging of trade receivables is as follows

December 31, 2018

December 31, 2017

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

1,449,927

330,310

145,153

83,679

54,486

89,740

44,856
953,707

1,701,931

3,151,858

F-48

1,434,097

287,173

100,383

56,386

34,685

70,609

47,241
925,904

1,522,381

2,956,478

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

The decrease in the overdue balance was mainly due to wholesale receivables from the municipality of Guarulhos, as a result of the
agreement signed in December 2018.

(c)      Allowance for doubtful accounts    

Balance at beginning of the year

Private sector /government entities

Recoveries

Net additions for the year

Write-offs of accounts receivable during the year
Balance at the end of the year

Reconciliation of estimated/historical 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, 2018

December 31, 2017

December 31, 2016

1,067,973

61,315

(29,846)

31,469
-
1,099,442

1,068,747

75,973

(76,747)

(774)
-
1,067,973

977,758

144,217

(25,272)

118,945

(27,956)
1,068,747

December 31, 2018

December 31, 2017

December 31, 2016

(184,555)

1,294

(61,315)

(29,458)
107,307

(171,729)

21,510

(75,973)

9,781
133,730

(177,492)

(7,292)

(144,217)

(2,596)
241,109

Amount recorded as bad debt expense, net of recoveries  

(166,727)

(82,681)

(90,488)

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Losses  from  wholesale  customers    related  to  the  municipalities  of  Santo  André  and  Mauá,  totalling  R$116,250  and  R$71,606,
respectively, were recorded as revenue reduction in 2018 (R$104,082 and R$64,070, respectively, in 2017). Additionally, a revenue
was recorded in the amount of R$716,981 in the same account, related to the municipality of Guarulhos. Accordingly, as a result of
these transactions, a revenue with wholesale services was recorded amounting to R$529,125, in 2018 (R$203,496 was recorded in
2017 as revenue reduction).

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

Accounts receivable

Current:

   Sanitation services (i)

   Allowance for losses (i)

   Reimbursement for retirement and pension benefits paid (G0):

      - monthly flow (payments) (ii)

      - GESP Agreement – 2008 (ii)

      - GESP Agreement – 2015 (iv)

Total current

Noncurrent:

    Agreement for the installment payment of sanitation services

   Reimbursement for retirement and pension benefits paid (G0):

      - GESP Agreement – 2015 (iv)

Total noncurrent

Total receivables from shareholders

Assets:

Sanitation services

Reimbursement of additional retirement and pension benefits (G0)

Total

Liabilities:

Interest on capital payable to related parties

Other (g)

F-50

December 31, 2018

December 31, 2017

122,522

(33,820)

22,926

-

118,441

(35,114)

22,968

20,099

                                      62,520

                                          54,379

174,148

180,773

17,045

652,057

669,102

843,250

105,747
737,503

843,250

338,407

8,694

22,625

611,762

634,387

815.160

105,952
709,208

815,160

300,717

1,367

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Revenue from sanitation services

Payments received from related parties

2018

2017

2016

501,146

462,989

445,726

(509,672)

(471,081)

(424,549)

Receipt of GESP reimbursement referring to Law 4,819/58

(173,516)

(192,889)

(139,472)

(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$33,820  as  of  December  31,  2018  (R$35,114  as  of  December  31,  2017)  as  allowance  for  losses  in
accordance of IFRS 9, applicable since January, 1 2018.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(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) 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 21 (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 (iv) below.  

On March 22, 2004, the Company signed the first amendment to the GESP Agreement, settling the amounts due by the São Paulo
State  Government  for  water  supply  and  sewage  services  provided,  monetarily  adjusted  through  February  2004;  and  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
defining the payment conditions of the remaining liabilities of the São Paulo State Government for the receipt of the water supply
and sewage services.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.  In December 2012 the last installment was paid.

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  of  R$915,251,  monetarily  adjusted  until  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  as  part  of  the  payment  of  the  Undisputed  Reimbursement  and  offered  to  GESP  a  provisional
settlement,  recognizing  a  credit  totaling  R$696,283,  corresponding  to  the  value  of  the  reservoirs  in  the  Alto  Tietê  system.  The
remaining debtor balance of R$ 218,967 was totally paid in 2018.

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 (iv) of this note).

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.

(iv)      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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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,  2018,  the  balance  receivable  totaled
R$62,520  in  current  assets  (R$  R$54,379  as  of  December  31,  2017)  and  R$652,057    in  noncurrent  assets  (R$611,762  as  of
December 31, 2017) and CTEEP shares were disposed of on April 20, 2016 for R$111.1 million.

(v) 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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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, 2018
and  2017,  the  amounts  related  to  the  pension  plan  benefits  paid  and  recorded  for  allowance  for  doubtful  accounts  totaled
R$ 1,107,104 and R$ 1,021,657, 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,  2018  and  2017,  the  pension  benefit  obligations  of  Plan  G0  totaled
R$2,606,107 and R$2,543,877, respectively. For detailed information on the pension benefit obligations refer to Note 21 (b) (iii).

(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  collection  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 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.  As  of  October  19,  2017,  the  conditions  precedent
were complied with and the agreement came into effect.

Based on a Private Transaction Agreement and Other Adjustments, the payments were established as follows:

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

- 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,
adjusted for inflation, due on every April 30 of the subsequent years, or on the first subsequent business day.

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.    Although  this  lawsuit  was  not  the  object  of  the  agreement,  the
Company understands that the approval of the agreement by the Extraordinary Shareholders’ Meeting would eliminate the risk that
this proceeding would continue in the judicial level.

As  of  August  7,  2017,  the  Company  was  once  again  served  with  process  in  a  citizen  suit  filed  by  Alvaro  Luiz  de  Lima  de  Alvares
Otero  against  ANEEL,  EMAE  and  SABESP  requesting  the  annulment  of  ANEEL  order,  which  consents  to  the  above  transaction.
The plaintiff claims that the act is illegal and harmful, compromises the operational feasibility of the Henry Borden hydroelectric
power  plant  and  jeopardizes  the  energy  security  of  the  São  Paulo  State,  the  Southeast  region  and  Brazil.  Finally,  the  plaintiff
requests  SABESP  to  indemnify  EMAE,  at  an  amount  to  be  calculated.  The  suit  was  extinguished  without  judgment  of  merit.  An
appeal was lodged by the author awaiting judgment by the Court of Justice.

The agreement entered into with EMAE will not necessarily resolve these actions.

As  of  December  31,  2018,  the  Company  recorded  R$16,055  and  R$90,518  in  Other  Liabilities,  under  current    and  noncurrent
liabilities, respectively. In 2018, the Company paid the amount of R$ 16,622.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(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

The Company has personnel assignment agreements with entities related to the State Government, whose expenses are fully passed
on and monetarily reimbursed.  In 2018, the expenses related to personnel assigned by SABESP to other state government entities
amounted to R$8,903 (R$9,853 in 2017 and R$10,393 in 2016).

In  2018,  the  expenses  related  to  personnel  assigned  by  other  entities  to  SABESP  were  R$  116  (In  2017  there  were  no  expenses
related to personnel assigned by other entities to SABESP and R$10 in 2016).

(f) Services obtained from state government entities

As  of  December  31,  2018  and  2017,  SABESP  had  an  outstanding  amounts  payable  of  R$8,694  and  R$1,367,  respectively,  for
services rendered by São Paulo State Government entities.

(g)      Non-operating assets

As  of  December  31,  2018  and  December  31,  2017,  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 health plans managed by Sabesprev, according to Note 21 (a).

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, 2018 amounted to R$363,902 (R$388,461 as of December 31, 2017), according to Note 21
(b) (i).

(i)       Compensation of Management Key Personnel

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

- 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% and 20%, 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.

In addition to the 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 Executive Officers, 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%  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$4,077, R$3,813 and R$3,912 for 2018, 2017 and 2016, respectively.  An additional amount of R$538, related to the
bonus program, was recorded in 2018 (R$556 in 2017 and R$494 in 2016).

(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

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

investments. Therefore, these SPEs are considered for accounting purposes as jointly arrangements.

The  Company  entered  into  a  loan  agreement  through  credit  facility  with  the  SPEs  Aquapolo  Ambiental  S.A.  and  with  Attend
Ambiental  S.A.,  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

Aquapolo Ambiental

Total

19,000

19,000

13,857

13,857

32,857

32,857

CDI + 1.2% a.a.

(i)

(i)       The loan agreement 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  maturing  on
December 30, 2021 and the last on December 30, 2023.

As of December 31, 2018, the principal and interest balance of this agreement was R$ 32,857, recorded in the non current assets
under "Other Accounts Receivables" (December 31, 2017 - R$ 50,617). In 2018 the financial income recognized was R$ 2,772 (in
2017 - R$ 5,017).

The contract amounting to R$ 10,838 existed as of  December 31, 2017, was fully paid on December 21, 2018.

Regarding  the  agreement  entered  into  with  Attend,  in  the  amount  of  R$  5,400  (principal),  which  had  been  overdue  since  June
2015, an allowance for doubtful accounts of R$ 9,596 (principal plus interest) was recorded, as a renegotiation agreement was not
reached.

(k)       “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,  2018,  the  program  total  amount  was  R$100,928  (R$82,697  as  of  December  31,
2017), there was no balance receivable as of December 31, 2018 and 2017 from related parties (R$6,148 as of December 31, 2016).
The amount of R$49,919 (R$35,068 as of December 31, 2017) was recorded in the group of intangible assets and R$51,009 was
reimbursed by GESP (R$47,629 as of December 31, 2017) from the beginning of the program until December 31, 2018.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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".

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,  2018,  the  balances  of  assets  and  liabilities  were
R$49,136 (R$70,487 as of December 31, 2017), and the liability is recorded in "other liabilities" under 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 recognized 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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Sesamm's  capital  as  of  December  31,  2018,  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

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, 2018, the capital of Águas de Andradina totaled R$ 17,948, divided into 17,936,174 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 2018, the Company contributed R$ 910 in the investee, through the issuance of 910,006 registered common shares with no par
value,  subscribed  and  paid-in.  The  amount  was  recorded  in  current  assets,  under  “Other  receivables”  and  was  reclassified  into
investments.

On  May  4,  2018,  the  shareholders  at  an  Annual  and  Extraordinary  Shareholders’  Meeting  approved  the  capital  increase  in  the
amount of R$ 1,062, through the issuance of 1,061,935 new registered common shares with no par value, fully subscribed and paid-
in, through the capitalization of the credits held by the shareholders as a result of the distribution of dividends. The Company holds
30% of this capital increase.

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, 2018, the company’s capital was R$ 2,785, and was represented by 2,785,225 registered shares without a par
value. SABESP holds a 30% interest and Iguá 70%.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

In  2018,  the  Company  contributed  R$  61  in  the  investee,  through  the  issuance  of  61,000  registered  common  shares  with  no  par
value,  subscribed  and  paid-in.  The  amount  was  recorded  in  current  assets,  under  “Other  receivables”  and  was  reclassified  into
investments.

On  May  4,  2018,  the  shareholders  at  an  Annual  and  Extraordinary  Shareholders’  Meeting  approved  the  capital  increase  in  the
amount of R$ 222, through the issuance of 221,613 new registered common shares with no par value, fully subscribed and paid-in,
through the capitalization of the credits held by the shareholders as a result of the distribution of dividends. The Company holds
30% of this capital increase.

The Company pledges as guarantee 100% of its shares in Águas de Castilho.

The operations initiated in January 2011.

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,  2018,  the  capital  of  Saneaqua  Mairinque  totaled  R$  4,183,  and  was  represented  by  3,141,239  registered
common  shares  without  a  par  value.  SABESP  holds  a  30%  interest  and  BRK  70%.  In  2018,  the  investee  received  capital
contribution of R$ 2,183, by issuing 1,141,239 new registered common shares with no par value, which was recorded as advance for
future capital increase in its noncurrent liabilities in 2017.

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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

As of December 31, 2018, 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, 2018, 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.

The Company pledges as guarantee 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, 2018, 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:

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

Company

Equity

Capital
increase

Dividends
distributed

Profit (loss) for the year

2018

2017

2016

2018

2018

2018

(*)

2017

2016

Sesamm

43,547

39,262

37,198

Águas de Andradina (i)

24,832

19,392

16,161

Águas de Castilho

6,084

4,880

Saneaqua Mairinque

Attend Ambiental

Aquapolo Ambiental
Paulista Geradora de
Energia

5,720

1,426

4,327

5,169

3,706

4,090

3,925

30,170

18,757

12,340

7,625

8,447

8,469

-

3,033

203

2,183

-

-

-

(1,336)

-

-

-

-

-

-

5,621

2,425

1,060

(478)

(4,731)

11,410

(448)

-

(18)

(59)

(312)

988

3

(374)

2,707

4,471

933

390

1,324

6,470

(22)

8,601

1,772

631

723

841

689

(40)

Company

Investments

Capital
increase

Dividends
distributed

Equity in the earnings of subsidiaries

Interest percentage

2018

2017

2018

(*)

2018

(*)

2017

2016

2018

2017

2016

Sesamm

15,677

14,135

Águas de Andradina

Águas de Castilho

Saneaqua Mairinque

Attend Ambiental

Aquapolo Ambiental
Paulista Geradora de
Energia

7,450

1,826

1,716

642

14,783

1,905

5,818

1,465

1,298

2,326

9,191

2,111

-

910

61

655

-

-

-

(481)

2,023

-

-

-

-

-

-

727

318

(143)

(2,129)

5,591

(112)

Total

43,999

36,344

1.626

(481)

6,275

Other investments

588

588

Overall total

44,587

36,932

-

(5)

(18)

(94)

445

975

729

287

71

560

1

3,144

(6)

(94)

235

5,760

4,740

3,096

532

189

217

378

338

(10)

36%

30%

30%

30%

45%

49%

25%

36%

30%

30%

30%

45%

49%

25%

36%

30%

30%

30%

45%

49%

25%

(*)  Refer  to  changes  in  the  equity  of  investees,  as  their  financial  statements  for  the  year  ended  December  31,  2017  were  issued,
including some adjustments, after the Company’s financial statements.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

13           Investment properties

December 31,  2017

disposals

Transfers

Depreciation

December 31,  2018

Write-offs and

Investment properties

Total

57,652

57,652

(9,995)

(9,995)

13

13

(50)

(50)

47,620

47,620

December 31,  2016

disposals

Depreciation

December 31,  2017

Write-offs and

Investment properties

Total

57,968

57,968

(244)

(244)

(72)

(72)

57,652

57,652

December

Write-offs

Reversal of

31,  2015

Transfers

and disposals

estimated losses

Depreciation

Investment properties

Total

56,957

56,957

1,231

1,231

(124)

(124)

10

10

(106)

(106)

December

31, 2016

57,968

57,968

As of December 31, 2018 and 2017, the market value of these properties is approximately R$386,000 and R$402,000, respectively.

14           Contract asset

    Contract asset (works in progress) is the right to consideration in exchange for goods or services transferred to

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

customers. As established by IFRS 15 - Revenue from contract with customer, assets related to the concession under construction,
recorded  under  the  scope  of  IFRIC  12  –  Service  Concession  Arrengements,  should  be  classified  as  contract  asset  during  the
construction period and transferred to intangible assets only after completion of the works.

A contract asset is initially recognized at fair value and includes borrowing costs capitalized during the period when the asset is
under construction, based on the weighted average rate of borrowings in effect on the capitalization date, as described in Note 3.12.

January 1, 2018

Additions

Contract
renewal

Transfers of Works
(*)

December 31,
 2018

Contract asset arising from:

Agreements – equity value

Agreements – economic value

Program contracts

1,303,552

233,361

367,199

111,703

(284,856)

-

1,809,257

806,554

284,856

Services contracts – São Paulo

6,733,732

1,788,210

Software license

Inventories

Advance to suppliers

Total

533

298,340

8,940

52,183

63,075

19

10,387,715

3,188,943

(*) Work in progress transferred from contract asset to intangible asset.

-

-

-

-

-

(475,481)

(96,676)

(676,695)

(4,867,158)

(52,700)

-

-

910,414

248,388

2,223,972

3,654,784

16

361,415

8,959

(6,168,710)

7,407,948

15           Intangible assets

(a)      Statement of financial position details 

December 31, 2018
Accumulated
amortization

Cost

Net

Cost

December 31, 2017
Accumulated
amortization

Net

Intangible right arising from:

Agreements – equity value

5,465,206

(1,391,862)

4,073,344

8,893,296

(1,751,682)

7,141,614

Agreements – economic value

1,948,255

(716,246)

1,232,009

2,068,402

(634,465)

1,433,937

Program contracts

12,710,937

(3,933,008)

8,777,929

10,653,292

(3,058,226)

7,595,066

Program contracts – commitments

1,320,106

(240,555)

1,079,551

1,113,160

(202,785)

910,375

Services contracts – São Paulo

17,474,797

(4,083,345)

13,391,452

19,388,751

(3,471,736)

15,917,015

Software license

Total

748,962

(290,787)

458,175

688,712

(220,587)

468,125

39,668,263

(10,655,803)

29,012,460

42,805,613

(9,339,481)

33,466,132

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(b)      Changes

  December
31, 2017

Transfers to
contract
assets (*)

Additions

Contract
renewal

Transfers of
works (**)

Transfers

Write-offs
and disposals

Amortization

December
31, 2018

Intangible  right  arising
from:

Agreements  – 
value 

equity

Agreements  –  economic
value 

7,141,614

(1,427,046)

93

(1,935,780)

499,002

(5,268)

(1,406)

(197,865)

4,073,344

1,433,937

(233,361)

373

-

114,442

Program contracts

7,595,066

(2,019,461)

928,818

1,935,780

681,742

Program 
commitments 

contracts  –

Services  contracts  –  São
Paulo

Software license

Total

910,375

-

206,946

15,917,015

(6,707,847)

468,125

-

3,724

4,774

33,466,132

(10,387,715)

1,144,728

-

-

-

-

-

4,818,734

54,790

88

3,011

-

12

686

(1,031)

(7,616)

(82,439)

1,232,009

(339,411)

8,777,929

-

(37,770)

1,079,551

(14,813)

(625,373)

13,391,452

-

(70,200)

458,175

6,168,710

(1,471)

(24,866)

(1,353,058)

29,012,460

(*) Work in progress transferred to contract asset due to adoption of IFRS 15, as of January 1, 2018, as described in Note 4.1.
(**) Work in progress transferred from contract asset to intangible asset.

  December 31,
2016

Additions

Contract
renewal

Reversal of
estimated
losses

Transfers

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

-

-

-

-

F-67

2,078

8

4,834

-

1,663

2,604

(2,795)

(185,244)

7,141,614

(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

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

  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

Program contracts

6,288,575

553,126

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

-

9,587

-

-

-

-

(8)

(4,360)

-

(4,495)

-

6

(110)

(77,563)

1,381,652

2,023

(5,571)

(267,359)

6,576,021

-

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

In  2018,  the  Company  renewed  a  program  contract  with  the  municipalities  of  Angatuba,  Arandu,  Assis,  Cachoeira  Paulista,
Carapicuíba,  Gália,  Guararema,  Itirapuã,  Monções,  Monte  Mor,  Piraju,  Poá,  Praia  Grande,  Queluz,  Salesópolis,  São  Vicente  and
Terra Roxa. The Company also started operations in the municipality of Saltinho.

In December 2018, the Company signed a contract with the municipalities of Guarulhos and Aguaí, to begin operating in January
and June of 2019, respectively.

All of these contracts are valid for 30 years, except for the contract signed with Guarulhos, which is valid for 40 years.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(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, 2018, the Company operated in 369 municipalities in the State of São Paulo (368 as of December 31, 2017). 
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 from 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.

(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, 2018 and 2017 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.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(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,  2018  and  2017,  the  amounts  not  yet  disbursed  were  recorded  under  “program  contract  commitments”,  in
current  liabilities,  totaling  R$  225,291  and  R$  128,802,  respectively,  and  in  noncurrent  liabilities,  totaling  R$  142,314  and
R$ 110,698, respectively. In 2018, 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 municipalitu of São Paulo for a 30-year period, which is extendable for an
another 30-year period.

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 services 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;

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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.

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
State 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 51.52% of the total revenue of the Company as of December 31, 2018, and ensures the judicial and assets
security.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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  2018,  the  Company  capitalized  interest  and  inflation  adjustment,  including  related  foreign  currency  exchange  effects  in
concession intangible assets, totaling R$488,502, including the São Lourenço Production System and Leases (R$649,048 in 2017
and R$700,743 in 2016) 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.

Accordingly,  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 2018 and 2017
the margin was 2.3%.

Construction margin for 2018, 2017 and 2016 were R$63,013, R$70,335 and R$81,513, 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 2018, the total
amount related to expropriations was R$106,429 (R$19,576 in 2017 and R$40,452 in 2016).

(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

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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,  2018  and  2017,  the  amounts  recognized  as  intangible  asset  related  to  PPP  were  R$359,759  and  R$371,862,
respectively.  In 2018, 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$10,361, 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. 

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.

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.

In  May  2018,  the  control  of  SPE  Sistema  Produtor  São  Lourenço  S/A  was  transferred  to  CGGC  Construtora  do  Brasil  Ltda,
previously composed of Construções e Comércio Camargo Corrêa S/A and Construtora Andrade Gutierrez S/A.

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 São Lourenço Production System (SPSL) PPP began the service provision phase on July 10, 2018, as per the contractual clause
that  allows  the  beginning  of  operations  provided  that  system  has  full  operating  capacity,  without,  however  implying  in  the
Acceptance of the Works. In this way, the Service Phase was initiated, with the consequent payment of the payments due, in parallel
with the completion of the Phase of Works.

The estimated amount by inflation adjustment through December 31, 2018 is approximately R$7.92 billion. 

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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$32.0 million, equivalent to the estimated monthly remuneration plus
interest  and  charges.    The  amount  above  will  be  annually  reevaluated  by  the  IPC  -  FIPE  and  should  be  monthly  recorded  in  a
restricted account, in accordance with the operating procedures of the agreements. 

This  obligation  with  the  SPE  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, 2018 and 2017, the carrying amount recorded in the Company’s intangible assets, related to this PPP, amounted
to  R$3,208,464  and  R$2,818,805,  respectively.    Intangible  assets  are  accounted  for  based  on  the  physical  evolution  of  the
construction  which,  as  of  December  31,  2018,  was  approximately  96.8%  complete,  with  a  counter-entry  in  the  Private  Public
Partnership (PPP) liabilities account.  In 2018, 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,  2018  and  2017  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 2018.

December 31, 2018

December 31, 2017

Current
liabilities

Noncurrent
liabilities

Total liabilities

Current
liabilities

Noncurrent
liabilities

Total liabilities

Alto Tietê

São Lourenço

Total

39,283
98,544

137,827

252,093
3,023,204

3,275,297

291,376
3,121,748

3,413,124

35,083
24,924

60,007

282,501
2,728,908

3,011,409

317,584
2,753,832

3,071,416

(h)      Works in progress

With the adoption of IFRS 15 - Revenue from contract with customer, as of January 1, 2018, assets related to the concession under
construction,  recorded  under  the  scope  of  IFRIC  12  –  Service  Concession  Arrengements,  previously  recognized  as  part  of  of
intangible assets as works in progress were reclassified to contract asset, according to note 14, in the amount of R$ 10,387 million.
The  amount  of  R$10,387  million  is  recorded  under  intangible  assets  as  works  in  progress  as  of  December  31,  2017  (R$10,387
million  as  of  December  31,  2017),  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  São  Lourenço  PPP),  R$253  million  and  R$208  million,
respectively.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(i)       Amortization of intangible assets

The amortization average rate totaled 4.2% as of December 31, 2018 and 3.9% as of December 31, 2017 and 2016.

(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 commercial module is in progress.

16           Property, plant and equipment

(a)      Statement of financial position details

Land

Buildings

Equipment

Transportation equipment

Furniture and fixtures

Other

Total

December 31, 2018
Accumulated
depreciation

-

(38,961)

Cost

92,979

79,086

372,872

(256,786)

11,333

27,250

1,659

(7,860)

(13,672)

(288)

Net

92,979

40,125

116,086

3,473

13,578

1,371

December 31, 2017
Accumulated
depreciation

-

(36,653)

Cost

92,507

79,013

Net

92,507

42,360

330,753

(226,950)

103,803

10,862

24,430

1,122

(7,182)

(12,614)

(238)

3,680

11,816

884

585,179

(317,567)

267,612

538,687

(283,637)

255,050

F-75

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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

Land

Buildings

Equipment

Transportation equipment

Furniture and fixtures

Other

Total

December 31, 2017

Additions

Transfers

Write-offs and
disposals

Depreciation

December
31,  2018

92,507

42,360

103,803

3,680

11,816

884

255,050

-

73

46,473

589

2,972

538

50,645

472

-

986

-

-

-

-

-

(81)

-

(27)

-

-

(2,308)

(35,095)

(796)

(1,183)

(51)

92,979

40,125

116,086

3,473

13,578

1,371

1,458

(108)

(39,433)

267,612

December 31, 2016

Additions

Transfers

Write-offs and
disposals

Depreciation

December 31,  2017

92,494

43,262

149,140

4,531

11,986

-

86

17,627

-

1,207

13

1,358

(15,945)

(33)

(75)

-

-

(178)

(27)

(54)

-

(2,346)

(46,841)

(791)

(1,248)

92,507

42,360

103,803

3,680

11,816

                       970

                             -

                       (15)

                      (20)

                       (51)

                       884

302,383

18,920

(14,697)

(279)

(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

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, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(c)      Depreciation

The Company annually review the depreciation rates of: buildings – 3.0%; equipment- 16.5%; transportation equipment - 10% and
furniture and fixture – 6.8%.  Land is not depreciated.

The depreciation average rate was 12.3%, 13.6% and 10.9%, as of December 31, 2018, 2017 and 2016, respectively.

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, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

17           Borrowings and financing

 Borrowings and financing outstanding balance

December 31, 2018

December 31, 2017

Financial institution

Local currency

 10th issue debentures

 12th issue debentures

 14th issue debentures

 15th issue debentures

 17th issue debentures

 18th issue debentures

 20th issue debentures

 21th issue debentures

 22th 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

Current Noncurrent

Total

Current Noncurrent

Total

42,493

45,450

41,270

359,394

279,100

33,469

248,334

-

-

75,223

16,899

11,227

4,364

3,186

23,632

30,589

31,615

19,077

1,380

98,410

40,194

249,249

103,005

-

532,691

165,267

-

499,604

756,040

82,687

294,699

144,275

359,394

811,791

198,736

248,334

499,604

756,040

1,266,592

1,341,815

-

39,169

18,811

23,100

123,875

252,197

490,729

549,589

8,163

-

16,899

50,396

23,175

26,286

147,507

282,786

522,344

568,666

9,543

98,410

41,702

45,450

40,503

346,414

144,391

33,020

250,000

-

-

78,487

16,782

11,143

4,334

2,367

23,469

30,378

10,050

17,573

1,466

101,855

80,953

294,702

141,351

122,655

340,152

181,854

345,788

692,202

781,922

194,872

246,890

499,628

-

926,313

227,892

496,890

499,628

-

1,154,599

1,233,086

16,782

50,028

22,991

19,526

146,461

280,825

397,922

544,044

9,477

-

33,564

61,171

27,325

21,893

169,930

311,203

407,972

561,617

10,943

101,855

1,365,112

5,118,275

6,483,387

1,199,384

5,228,761

6,428,145

 Borrowings and financing outstanding balance

December 31, 2018

December 31, 2017

Financial institution

Foreign currency

 Inter-American Development Bank - BID 1212  – US$71,947
thousand (US$92,503 thousand in December 2017)

 Inter-American Development Bank - BID 2202 – US$544,457
thousand (US$438,071 thousand in December 2017)

 International Bank of Reconstruction and Development -BIRD –
US$91,286 thousand (US$79,946 thousand in December 2017)

 Deutsche Bank – US$75,000 (US$150,000 thousand in
December 2017)

 Eurobonds – US$350,000 thousand (US$350,000 thousand in
December 2017)

 JICA 15 – ¥12,676,730 thousand (¥13,829,160 thousand in
December 2017)

 JICA 18 – ¥11,397,760 thousand (¥12,433,920 thousand in
December 2017)

 JICA 17 – ¥1,826,957 thousand (¥1,534,959 thousand in
December 2017)

 JICA 19 – ¥31.561.726 thousand (¥29,777,232 thousand in
December 2017)

 BID 1983AB – US$58,462 thousand (US$82,404 thousand in
December 2017)

 Interest and charges

Total in foreign currency

Current Noncurrent

Total

Current Noncurrent

Total

39,826

238,954

278,780

34,000

238,000

272,000

124,098

1,969,565

2,093,663

81,757

1,375,358

1,457,115

11,779

341,646

353,425

-

301,665

301,665

288,479

-

288,479

248,100

242,343

490,443

-

1,354,532

1,354,532

-

1,155,331

1,155,331

40,646

406,462

447,108

33,881

372,696

406,577

36,545

365,230

401,775

30,463

334,849

365,312

11,835

51,786

63,621

2,507

41,835

44,342

64,028

1,047,081

1,111,109

-

873,383

873,383

68,554

52,710

155,653

224,207

-

52,710

79,201

37,462

189,990

-

269,191

37,462

738,500

5,930,909

6,669,409

547,371

5,125,450

5,672,821

Total borrowings and financing

2,103,612

11,049,184

13,152,796

1,746,755

10,354,211

12,100,966

Exchange rate as of December 31, 2018: US$3.8748; ¥0.03527 (as of December 31, 2017: US$3.3080; ¥0.02940).
As of December 31, 2018, the Company did not have balances of borrowings and financing, raised during the year, to mature within 12 months.

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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

20th issue debentures

Own funds

2024

TJLP 1.92 % (Series 1 and 3) and 8.25% (Series 2)

IPCA (Series 2)

Own funds

2019

CDI + 3.80%

21th issue debentures

Own funds

2022

CDI + 0.60% e CDI+ 0.90%

22th issue debentures

Own funds

2025

CDI +0.58 (Series 1) and CDI + 0.90% (Series 2) and
6.0% (Series 3)

Brazilian Federal Savings Bank

Own funds

2019/2039

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

5% to 9.5%

TJLP+2.5%

TJLP+2.15%

TJLP+1.72%

TJLP+1.72%

TJLP+1.92%

TJLP+1.66%

TJLP+2.5%

IPCA (Series 3)

TR

Leases

Other

2035

7.73% to 10.12%

Own funds

2025

12% (Presidente Prudente) and TJLP + 1.5% (FINEP)

IPC

TR

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, 2018, 2017 and 2016
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$71,947
thousand

Inter-American Development Bank - BID 2202  - US$544,457
thousand

Government

2025

3.31% (*)

Government

2035

3.42% (*) 

International Bank for Reconstruction and Development - BIRD
US$91,286 thousand

Government

Deutsche Bank US$75,000 thousand

Eurobonds – US$350,000 thousand

JICA 15 – ¥12,676,730 thousand

JICA 18 – ¥11,397,760 thousand

JICA 17– ¥1,826,957 thousand

JICA 19– ¥31,561,726 thousand

BID 1983AB – US$58,462 thousand

- 

- 

Government

Government

Government

Government

- 

2034

2019

2020

2029

2029

2035

2037

2023

2.85% (*)

4.50%(*)

6.25%

1.8% and 2.5%

1.8% and 2.5%

1.2% and 0.01%

1.7% and 0.01%

2.08% to 2.38% (*)

(*)Rates comprising LIBOR + contractually defined spread.

US$

US$

US$

US$

US$

Yen

Yen

Yen

Yen

US$

F-81

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(i) Payment schedule – accounting balances as of December 31, 2018

LOCAL CURRENCY

Federal 

Savings

Debentures

Brazilian 
Bank

BNDES

Leasing

Other

Interest and charges

TOTAL 
CURRENCY

IN 

LOCAL

FOREIGN CURRENCY

BID

BIRD

2019

2020

2021

2022

2023

2024

2025 to 2039

TOTAL

1,049,510

589,190

479,995

559,184

362,555

204,832

150,294

3,395,560

75,223

78,072

82,169

86,589

121,512

103,260

102,809

102,809

19,077

1,380

98,410

36,903

38,700

40,654

1,380

-

1,380

-

1,380

-

79,037

97,069

43,416

1,380

-

77,369

863,356

1,341,815

91,581

45,153

1,380

-

450,353

1,069,393

344,763

568,666

1,263

-

9,543

98,410

1,365,112

808,805

705,053

790,616

583,457

420,315

1,810,029

6,483,387

163,923

163,923

163,923

163,923

163,923

163,923

1,388,905

2,372,443

11,779

23,557

23,557

23,557

23,557

23,557

223,861

353,425

Deutsche Bank

288,479

-

-

1,354,532

-

-

-

-

-

-

-

-

-

-

288,479

1,354,532

Eurobonds

JICA

BID 1983AB

Interest and charges

TOTAL 
CURRENCY

IN 

Overall Total

FOREIGN

153,055

140,431

140,431

140,431

140,431

140,431

1,168,403

2,023,613

68,554

52,710

67,786

29,806

29,806

28,255

-

-

-

-

-

-

-

-

224,207

52,710

738,500

1,750,229

357,717

357,717

356,166

327,911

2,781,169

6,669,409

2,103,612

2,559,034

1,062,770

1,148,333

939,623

748,226

4,591,198

13,152,796

F-82

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

(ii)   Changes

LOCAL
CURRENCY

Debentures
Brazilian
Federal
Savings Bank

BNDES

Leasing

Other
TOTAL IN
LOCAL
CURRENCY

FOREIGN
CURRENCY

BID

BIRD
Deutsche
Bank

Eurobonds

JICA

BID 1983AB
TOTAL IN
FOREIGN
CURRENCY

Overall Total

December
31, 2017

Funding

Borrowings
costs

Monetary
variation
and
exchange
rate
changes

Inflation
adjustment /
update
incorporated
interest -
Capitalized

Interest
and fees
paid

Amortization

Accrued
interest

Interest
and fees –
Capitalized
(*)

Borrowings
costs -
expenses

December
31, 2018

3,576,842

750,000

(3,021)

62,676

1,236,674

194,244

1,042,036

131,000

561,616
10,977

-
-

-

-

-
-

-

3,438

-
69

-

-

(259,175)

(905,080)

226,810

34,409

3,400 3,486,861

(102,772)

(85,515)

4,001

(90,397)

(102,314)

6,366
-

(38,196)
(772)

(17,427)
(1,470)

75,668

28,909

40,290
763

27,385

55,725

16,017
4

-

1,345,684

207

1,072,605

-
-

568,666
9,571

6,428,145

1,075,244

(3,021)

66,183

10,367

(491,312)

(1,111,806)

372,440

133,540

3,607

6,483,387

1,743,257

484,690

(2,365)

237,433

53,208

(55,391)

(130,520)

26,910

303,278

496,726

1,158,642

1,700,448
270,470

-

-

-

-

-

-

80,196
-

(191)
-

48,279

3,462

(7,607)

-

6,945

62,918

198,380

329,638
39,241

-

-

6,787
-

(35,207)

(97,952)

(33,519)
(11,060)

(268,508)

28,862

-

(82,608)
(85,306)

85,072

33,992
9,681

41,878

2,044

4,454

13,448

1,209
1,488

885

2,399,985

19

356,420

3,627

292,872

822

1,358,412

176
1,078

2,036,128
225,592

5,672,821

564,886

(2,556)

915,889

63,457 (240,736)

(566,942)

191,462

64,521

6,607 6,669,409

12,100,966

1,640,130

(5,577)

982,072

73,824 (732,048)

(1,678,748)

563,902

198,061

10,214 13,152,796

(*) amount related to accrued interest which as part of the contract asset.

F-83

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-

-

-

-

-

-

-

-
-

-

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

26/04/2019

sbsform20f_2018.htm - Generated by SEC Publisher for SEC Filing

Companhia de Saneamento Básico do Estado de São Paulo - SABESP

Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
Amounts in thousands of reais, unless otherwise indicated

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

Interest
and fees –
Capitalized
(*)

Borrowings
costs -
expenses

December
31, 2017

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)

(767,966)

289,780

169,366

3,820

6,428,145

1,811,664

261,337

485,090

96,889

35,710

-

-

1,617,215
343,588

63,909
-

(2,497)

-

(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)

-

-

2,525
-

(31,774)

(85,338)

(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

1,158,642

160
1,323

1,700,448
270,470

Eurobonds

1,141,469

5,660,363

196,508

(3,586)

96,303

45,590 (199,398)

(330,592)

137,001

11,964,143

1,012,315

(4,743) 24,693

159,087

49,517

(676,087)

(1,098,558)

426,781

63,975

233,341

6,657

5,672,821

10,477

12,100,966

(*) amount related to accrued interest which as part of the contract asset.

F-84

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Notes to the Financial Statements
Years ended December 31, 2018, 2017 and 2016
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

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

(*) amount related to accrued interest which as part of the contract asset.

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(a)         Debentures

Balance as of December 31, 2018 is stated net of borrowings costs in the amount of R$5,590 (R$6,223 as of December 31, 2017),
which will be amortized during the same maturity period of each contract.

(i)        Main events

Amortizations

17th issue - series 1

17th issue - series 2

20th issue

10th issue

12th issue

14th issue

18th issue

(*) Amounts paid during the year.

Funding

Amount

Maturity

Interest rates

R$ 144,391

R$ 348,434

R$ 250,000

R$ 42,438

R$ 45,450

R$ 40,726

R$ 33,641

January 15, 2018

February 15, 2018

December 20, 2018

2018 (*)

2018 (*)

2018 (*)

2018 (*)

CDI

IPCA

CDI

TJLP/IPCA

TR

TJLP/IPCA

TJLP/IPCA

As of February 19, 2018, the Company held the 22nd issue of unsecured debentures, not convertible into shares, totaling R$
750 million, in up to three series, for public distribution, with restricted placement efforts, pursuant to CVM Instruction
476/09, distributed as follows:

Amount

Maturity

Series 1
Series 2
Series 3

R$ 100,000
R$ 400,000
R$ 250,000

3 years
5 years
7 years

Remuneration

CDI + 0.58% p.a.
CDI + 0.90% p.a.
IPCA + 6.00% p.a.

The proceeds from the debenture issue a allocated to refinance financial commitments and recompose the Company’s cash.

(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 10th, 14th and 18th issues and the financing agreements entered into with the BNDES, except
for agreement no. 08.2.0169.1 (PAC):

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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:

·       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;

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·       suspend the release of funds; and/or
·       declare the early maturity of the financing agreements.

As  of  December  31,  2018,  the  amount  of  R$242.9  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, e.g., 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;

- 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.

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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, 2018, SABESP’s rate was “brAAA”.

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

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 20th issue, 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.

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Applicable to 21st and 22st issues:

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$194,244 in 2018, mainly related to the agreements in progress of the Growth Acceleration Program (PAC).

In 2018, amortizations totaled R$85,515.

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.

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(ii)      Sanitation to All Program of the Brazilian Federal Savings Bank (CEF)

On  December  28,  2018,  SABESP  entered  into  seven  financing  agreements  (twenty-one  sub-credits)  with  the  Brazilian  Federal
Savings Bank, totaling R$ 652.2 million. The agreements were selected by the Ministry of Cities – City Progress / Sanitation to All
Programs. The funds came from the Guarantee Fund for Length of Service - FGTS and will allocated  to sanitation services.

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.

The agreement has the following covenants:

Calculated  every  quarter  upon  the  disclosure  of  interim  financial  information  based  on  information  included  in  the  financial
statements for the last twelve (12) months:

Restrict the funding of new debt so that:

·  Adjusted EBITDA/ adjusted financial expenses equal to or higher than 2.80;
·  Adjusted net debt/adjusted EBITDA: equal to or higher than 3.80;
·  Other onerous debt(*) / adjusted EBITDA lower than or equal to 1.30

(*) “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.

(c) BNDES

Balance  as  of  December  31,  2018  is  stated  net  of  borrowings  costs  in  the  amount  of  R$2,584  (R$2,793  on  December  31,  2017),
which will be amortized during the same maturity period of each contract.

(i)        Main events

In  2018,  funding  from  current  contracts  totaled  R$131,000,  mainly  referring  to  the  BNDES  2015  agreement,  in  the  amount  of
R$124,000 and BNDES PAC II 9752, in the amount of R$ 7,000.

In 2018, amortizations totaled R$102,314.

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

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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.

(e)      Eurobonds

Balance as of December 31, 2018 is net of borrowing costs in the amount of R$1,648 (R$2,470 as of December 31, 2017), 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.

Non-compliance 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

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Balance as of December 31, 2018 is net of borrowing costs in the amount of R$2,131 (R$5,757 as of December 31, 2017), which will
be amortized during the maturity period of the contract.

In 2018, amortizations totaled R$ 268,508.

(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.

Non-compliance 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, 2018 is net of borrowing costs amounting to R$15,999 (R$14,517 as of December 31, 2017), which will
be amortized during the same maturity period of the agreement.

(i)        Main events

In 2018, funding referring to BID 2202 agreement totaled R$ 484,690 and amortizations totaled R$ 130,520.

(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.

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(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.

These  agreements  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, 2018 is stated net of borrowing costs amounting to R$3,113 (R$3,100 as of December 31, 2017), which
will be amortized during the same maturity period of the contract.

(ii)      Main events

In 2018, the Company raised R$80,196, referring to BZ-P19 (JICA 19) e BZ-P17 (JICA 17) agreements.

In 2018, amortizations totaled R$82,608 referring to JICA BZ-15, JICA BZ-17 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, 2018 is net of borrowing costs amounting to R$2,322 (R$3,400 as of December 31, 2017),
which will be amortized during the same maturity period of the contract.

(i)        Main events

In 2018, amortization totaled R$85,306.

(ii)      Covenants

The Company has the following restrictive clauses “covenants”:

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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.

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, 2018 is stated net of borrowing costs amounting to R$290 (R$310 as of December 31, 2017), which will
be amortized during the same maturity period of the contract.

For the guarantees assigned, see item g (ii) of this Note.

(k)      Covenants

As of December 31, 2018 and 2017, the Company had met the requirements set forth by its borrowings and financing agreements.

(l) Exchange rate changes

In 2018, the US dollar appreciated 17.1%, from R$ 3.3080 on December 31, 2017 to R$ 3.8748 on December 31, 2018, increasing
debt  in  US  dollars  by  R$  675,145,  and  the  yen  appreciated  20.0%,  from  R$  0.02940  on  December  31,  2017  to  R$  0.035270  on
December 31, 2018, increasing debt in yen by R$ 337,309.

F-95

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(m)    Borrowings and financing – Credit Limits

Agent

Brazilian Federal Savings Bank

Brazilian Development Bank – BNDES

Japan International Cooperation Agency – JICA

Other

TOTAL

December 31, 2018

(in millions of reais (*))

1,908

1,455

208

38

3,609

(*) Brazilian Central Bank’s exchange rate as of December 30, 2018 ( ¥1.00 = R$0.03527).

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.

   Taxes recoverable/payable

(a)         Current assets

Recoverable taxes

Income tax and social contribution

Withholding income tax (IRRF) on financial investments

Other federal taxes

Total

December 31, 2018

December 31, 2017

361,758

6,423

12,522

380,703

270,614

2,606

3,365

276,585

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.

F-96

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(b)         Current liabilities

Taxes and contributions payable

Cofins and Pasep

INSS (Social Security contribution)

IRRF (withholding income tax)

Other

Total

   Deferred taxes and contributions

(a)         Statement of financial position details

Deferred income tax assets

Provisions

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, 2018

December 31, 2017

82,381

38,871

66,825
12,486

200,563

74,034

35,365

58,204
16,362

183,965

December 31, 2018

December 31, 2017

337,833

157,044

54,131

197,920
186,887

933,815

(433,842)

(420,978)

(206,978)

(36,430)

(86,164)
(10,665)

(1,195,057)

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

(261,242)

(36,754)

F-97

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(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

December 31, 2018

December 31, 2017

158,294
775,521

933,815

(32,546)
(1,162,511)

(1,195,057)

(261,242)

221,999
832,104

1,054,103

(51,520)
(1,039,337)

(1,090,857)

(36,754)

Deferred income tax assets

Provisions

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

Net change

December 31, 2018

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)

(145,030)

(8,459)

(981)

(1,143)
35,325

(120,288)

26,335

(5,599)

(130,273)

108

2,783
2,446

(1,090,857)

(104,200)

337,833

157,044

54,131

197,920
186,887

933,815

(433,842)

(420,978)

(206,978)

(36,430)

(86,164)
(10,665)

(1,195,057)

Deferred tax assets (liabilities), net

(36,754)

(224,488)

(261,242)

F-98

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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, 2016

Net change

December 31, 2017

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)

(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)

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)

Opening balance

Net change in the year:

 - corresponding entry to the income statement
 - corresponding entry to valuation adjustments to
equity (Note 21 (b))

Total net change

Closing balance

(d)      Reconciliation of the effective tax rate

December 31, 2018

December 31, 2017

December 31, 2016

(36,754)

186,345

128,242

(224,596)

108

(224,488)

(261,242)

(101,517)

(121,582)

(223,099)

(36,754)

(60,667)

118,770

58,103

186,345

The amounts recorded as income tax and social contribution expenses in the financial statements are reconciled to the statutory
rates, as shown below:

F-99

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Profit before income taxes

Statutory rate

Estimated expense at statutory rate

Tax benefit of interest on equity

Permanent differences

     Provision – Law 4,819/58 - Go (i)

     Donations

     Other differences

December 31, 2018

December 31, 2017

December 31, 2016

3,912,319

34%

(1,330,186)

264,816

(46,544)

(13,068)

47,731

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

Income tax and social contribution

(1,077,251)

(984,304)

(1,181,956)

Current income tax and social contribution

Deferred income tax and social contribution

Effective rate

(852,655)

(224,596)

28%

(882,787)

(101,517)

28%

(1,121,289)

(60,667)

29%

(i)     Permanent difference related to the provision for actuarial liability (Note 21 (b) (iii)).

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   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

December 31,
2018

Provisions

Escrow
deposits

December 31,
2017

290,649

67,985

98,302

63,335

302,935

170,419

993,625

(43,841)

(24,380)

(13,519)

(8,091)

(10,932)

-

(100,763)

458,387

535,238

-

(100,763)

246,808  
43,605  
84,783  
55,244  
292,003  
170,419  
892,862  

458,387  
434,475  

438,619

(56,301)

382,318

332,037

(259,608)

114,544

77,100

299,842

160,446

(16,227)

(5,507)

(6,741)

-

72,429

98,317

71,593

293,101

160,446

1,422,588

(344,384)

1,078,204

607,959

-

814,629

(344,384)

607,959

470,245

F-101

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(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

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,
2017

Additional
provisions

Interest and
inflation
adjustment

Use of the
accrual

Amounts not
used
(reversal)

December 31,
2018

438,619

332,037

114,544

77,100

299,842

160,446

1,422,588

(344,384)

1,078,204

29,732

36,100

22,578

10,763

83,499

33,392

216,064

(53,205)

162,859

40,749

21,161

12,939

4,157

32,290

18,294

129,590

(5,533)

124,057

(141,421)

(308,253)

(16,146)

(2,490)

(44,900)

(115)

(513,325)

269,248

(77,030)

(13,060)

(35,613)

(26,195)

(67,796)

(41,598)

(261,292)

33,111

(244,077)

(228,181)

290,649

67,985

98,302

63,335

302,935

170,419

993,625

(100,763)

892,862

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

26,642

23,017

13,517

6,877

55,106

32,377

157,536

(29,089)

128,447

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

December 31,
2015

Additional
provisions

Interest and
inflation
adjustment

Use of the
accrual

Amounts not
used
(reversal)

December 31,
2016

561,061

296,660

124,833

62,812

283,991

83,520

1,412,877

(330,663)

1,082,214

109,540

12,885

20,638

20,716

51,408

68,485

283,672

(38,269)

245,403

F-102

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

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(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, 2018

December 31, 2017

207,600

1,459,100

719,300

1,439,100

624,200

4,343,800

8,793,100

219,900

1,430,600

733,100

1,291,000

677,400

3,879,000

8,231,000

(c)      Explanation on the nature of main classes of lawsuits

(i)      Customer claims

Approximately  890  lawsuits  (1,070  as  of  December  31,  2017)  were  filed  by  commercial  customers,  who  claim  that  their  tariffs
should  correspond  to  other  consumer  categories,  and  490  lawsuits  (680  as  of  December  31,  2017)  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 40 lawsuits (50 as of December 31, 2017) 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$ 135,510 decrease
in  accrued  lawsuits  was  mainly  due  to  payments  in  the  period,  and  revisions  of  expectations  arising  from  court  decisions  in  the
period.

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(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. The R$ 28,824 decrease in accrued lawsuits was mainly due to payments in the
period.

(iii)      Other civil claims

These mainly refer to indemnities for property damage, pain and suffering, and loss of profits allegedly caused to third parties, such
as vehicle accidents, claims, challenges on the methodology to collect tariffs, among others, 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$ 16,349 decrease in accrued
lawsuits was mainly due to revisions of expectations arising from court decisions in the period. The R$ 148,100 increase in lawsuits
deemed as contingent liabilities is mainly related to the 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, 2018 in the amount of R$ 53,430 (R$ 52,192 as of December 31, 2017).  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.  In  March  2018,  a  decision  for  production  of  more  evidence  was  published.  Management
considers that this administrative proceeding is deemed as a possible disbursement.

(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$ 605,008
(R$  547,510  as  of  December  31,  2017),  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-104

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(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, 2018 and is R$ 36,070 (R$ 42,173 as of December 31, 2017).  Management considers
that this administrative proceeding is deemed as a possible disbursement.

(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, 2018 and is estimated at R$ 52,427 (R$ 51,374 as of December 31, 2017). Management considers
that this administrative proceeding is deemed as a possible disbursement.

(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, 2018, the restated amounts of such lawsuits were R$ 17,682 (R$ 40,123 as of
December 31, 2017) and R$ 677,786 (R$ 582,168 as of December 31, 2017), respectively.

(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$ 53,200 decrease in lawsuits deemed as contingent liabilities is mainly
due to the revision of expectations arising from court decisions in the year.

(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$  464,800  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.

F-105

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(d)      Other concession-related legal proceedings      

The Company is a party to concessions-related proceedings, where it challenges compensatory issues for the resumption of water
supply and sewage collection services by some municipalities or the right to continue operating said services.

The amount of intangible assets related to the municipalities mentioned in the lawsuits mentioned below totaled R$ 114,335 as of
December  31,  2018  (R$  114,335  as  of  December  31,  2017),  of  which  R$  109,990  (items  “c”  to  “h”)  reclassified  to  indemnities
receivable in current and noncurrent assets, and estimated losses in the full amount of the claim were recorded, in previous periods.
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.

(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.  SABESP  filed  a  special  appeal.  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. The lawsuit is currently awaiting judgment of the special appeal filed by SABESP. 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  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  decision.    The  indemnity  action  was  judged
groundless in first instance and upheld by the Court of Justice. The appeal filed by SABESP in the Superior Court of Justice
was not known;

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(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 decision.  SABESP filed an indemnity action,
which is in progress, in the forensic expert stage;

(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 was
held valid to determine the reimbursement of R$ 16,554, which must be adjusted for inflation as from the filing of the lawsuit
(February 2008). This decision may be challenged.

(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.

(e)      Environmental lawsuits with settlements entered into in 2018

In 2018, the Company entered into several legal and administrative agreements totaling R$ 48,353. Of this amount, R$ 46,538 is
related  to  the  construction  and  R$  1,835  to  environmental  indemnifications,  recorded  under  “other  liabilities”.  The  accumulated
balance as of December 31, 2018, corresponding to environmental indemnifications, totaled R$ 44,828 (R$ 43,014 as of December
31, 2017).

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(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 2018, the Company used R$ 160,377 of the total contracted amount (R$ 101,192 in 2017). The amount of R$ 471,556 is currently
outstanding from the current contract.

21           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: 7.2% (December 31, 2017 – 7.7%) on average, of gross payroll;

.     Participating employees: 3.21% of base salary and premiums, equivalent to 2.5% of payroll, on average.

(b)      Pension plan benefits

Funded plan – G1 (i)

Present value of defined benefit obligations

Fair value of the plan's assets

December 31, 2018

December 31, 2017

2,532,338

(2,168,436)

2,319,841

(1,931,380)

Net liabilities recognized for defined benefit obligations

363,902

388,461

Unfunded plan – G0 (iii)

Present value of defined benefit obligations

2,606,107

2,543,877

Net liabilities recognized for defined benefit obligations

2,606,107

2,543,877

Liability as per statement of financial position – pension obligations (*)

2,970,009

2,932,338

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Despite the decrease in interest rate in the year, the decrease of actuarial deficit was mainly due to the higher profitability of the
plan’s assets.

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, 2018

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, 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

G1 Plan

G0 Plan

Total

(114,188)

113,869

(319)

108

(211)

(10,783)

-

(10,783)

-

(10,783)

(124,971)

113,869

(11,102)

108

(10,994)

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)

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(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, 2018, SABESP had a net actuarial liability of R$363,902 (R$388,461 as of December 31, 2017) 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

Benefits paid

2018

2017

2,319,841

13,905

213,201

114,188

(128,797)

2,465,721

17,582

260,409

(305,511)

(118,360)

Defined benefit obligation, end of the year

2,532,338

2,319,841

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

Fair value of the plan’s assets, end of the year

2018

2017

1,931,380

179,449

36,199

36,336

(128,797)

113,869

2,168,436

1,712,551

183,689

48,742

52,675

(118,360)

52,083

1,931,380

(Deficit)/Surplus

(363,902)

(388,461)

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The amounts recognized in the year are as follows:

Current service expenses

Interest cost rate

Expected return on the plan's assets

Total expenses

2018

2017

2016

(22,431)

213,201

(35,093)

260,409

13,562

285,227

(179,449)

(183,689)

(201,778)

11,321

41,627

97,011

In 2018, the expenses related to defined pension plan amounting to R$7,530, R$1,133 and R$704 (R$35,156, R$1,864 and R$619
in  2017  and  R$60,263,  R$7,982  and  R$24,557  in  2016),  were  recorded  in  operating  costs,  selling  and  administrative  expenses,
respectively.  The amount of R$1,955 was capitalized in assets (R$3,988 in 2017 and R$4,209 in 2016).

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

2019

8,610

224,429

(31,712)

(192,965)

8,362

2018

2017

2016

4.91% p.a.

4.01% p.a.

9.12% p.a.

5.35% p.a.

3.96% p.a.

5.74% p.a.

4.87% p.a.

9.52% p.a.

10.89% p.a.

6.09% p.a.

6.04% p.a.

6.97% p.a.

AT-2000

AT-2000

AT-2000

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The number of active participants as of December 31, 2018 was 4,056 (4,317 as of December 31, 2017), and of inactive participants
was 7,149 (6,978 as of December 31, 2017).

The benefit to be paid of G1 pension plan, expected for 2019 is R$177,516.

The  contributions  of  the  Company  and  participants  of  Plan  G1  in  2018  were  R$  36,199  (R$  48,742  in  2017)  and  R$  36,336
(R$  52,047  in  2017),  respectively.  Of  this  amount,  the  Company  and  the  participants’  payments  corresponding  to  the  actuarial
deficit of the G1 funded plan in 2018, totaled R$ 26,672 and R$ 16,832, 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

Life expectation

Wage increase rate

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 year

Decrease of 1 year

Increase of 1.0%

Decrease of 1.0%

Decrease of R$263,661

Increase of R$319,455

Increase of R$48,558

Decrease of R$49,705

Increase of R$31,418

Decrease of R$27,019

The plan’s 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:

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Fixed income

     -  NTNBs

     -  NTNCs

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

Other

December 31, 2018

December 31, 2017

1,225,738

163,966

1,389,704
87,939

-

-

1,477,643

249,740

-

249,740

121,043

-

310,785

431,828

9,225

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

7,517

(a)
(b)

(c)

(d)

(e)

(f)

(g)

(h)

Fair value of the plan's assets

2,168,436

1,931,380

(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.

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(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)  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) instruments 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, 2018, Sabesprev did not have financial assets issued by the Company in its own portfolio; however, said assets
could have been part of the investment fund portfolio invested by the Foundation. The real estate held in the portfolio is not used by
the Company.

The assets’ consolidated profitability came to 11.75% in 2018, exceeding its actuarial target of 9.12% in the same period (INPC +
5.5% p.a.). In 2017, profitability reached 12.02%, also exceeding the variation of the actuarial target for that year, of 7.68%.

Concerning Fixed Income, the strategies focused on federal government bonds prevailed. Said bonds appreciated due to the result
of presidential election, which market agents believe may give rise to liberal reforms.

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Concerning Equities, investments appreciated for the same reason, which led to the appreciation of fixed income investments. The
return of Ibovespa reached 15.03% in 2018 and 26.86% in 2017.

Structured  Investments  also  appreciated  due  to  the  valuation  of  investees,  which  are  currently  more  developed  than  in  previous
years, in addition to dividend payments in 2018.

(ii)        Private pension plan benefits – Defined contribution

As of December 31, 2018, Sabesprev Mais plan, based on defined contribution, had 9,586 active and assisted participants (9,328 as
of December 31, 2017).

With respect to the Sabesprev Mais plan, the contributions from the sponsor represent 100% over the total basic contribution from
the participants. In 2018, expenses related to the obligation of defined contribution, totaling R$13,227, R$1,820 and R$3,599, were
allocated  to  operating  costs,  selling  expenses  and  administrative  expenses.  The  amount  of  R$2,115  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$20,762 in 2018 (R$19,220 as of December 31, 2017).

(iii)    G0 Plan

Pursuant  to  State  Law  4,819/58,  employees  who  started  providing  services  prior  to  May  1974  and  retired  as  an  employee  of  the
Company acquired a legal right to receive supplemental pension payments, which rights are referred as "G0 Plan ". 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  considered  virtually  certain
that will be reimbursed by the State Government. As of December 31, 2018, the Company recorded a defined benefit obligation for
the G0 Plan of R$ 2,606,107 (R$ 2,543,877 as of December 31, 2017).

Defined benefit obligation, beginning of the year

Current interest expense and service costs

Actuarial (gains)/losses recorded as other comprehensive income

Benefits paid

2018

2,543,877

232,248

10,783

(180,801)

2017

2,512,080

262,873

(51,535)

(179,541)

Defined benefit obligation, end of the year

2,606,107

2,543,877

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The amounts recognized in the income statement are as follows:

Current interest expense and service costs

Amount received from GESP (undisputed amount)

Total expenses

2018

2017

2016

232,248

(96,282)

262,873

(95,191)

282,117

(96,709)

135,966

167,682

185,408

In 2018 and 2017, 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

2019

227,367

227,367

2018

2017

2016

4.84% p.a.

5.30% p.a.

5.71% p.a.

4.01% p.a.

3.96% p.a.

4.87% p.a.

6.09% p.a.

6.04% p.a.

6.97% p.a.

AT-2000

AT-2000

AT-2000

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The number of active participants of Plan - Go as of December 31, 2018 and 2017 was 10. The number of beneficiaries, retirees and
survivors as of December 31, 2018 was 2,038 (2,294 as of December 31, 2017).

The benefit payable from the Go pension plan expected for 2019 is R$188,328.

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

Life expectation

Wage growth rate

(c)      Profit sharing

Changes in assumption

Impact on present value of the defined
benefit obligations

Increase of 1.0%

Decrease of 1.0%

Increase of 1 year

Decrease of 1 year

Increase of 1.0%

Decrease of 1.0%

Decrease of R$233,665

Increase of R$275,063

Increase of R$81,430

Decrease of R$81,436

Increase of R$280,410

Decrease of R$241,841

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, from January to December 2018. The limit of the profit sharing is up to one-month salary for
each employee, depending on performance goals reached. As of December 31, 2018, the Program’s balance payable was recorded
under “salaries, payroll charges and social contributions” in the amount of R$ 110,464 (R$ 94,352 as of December 31, 2017).

22           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 15 (c) (v) (6)).  The balances as of December 31, 2018 and 2017 were R$ 454,022 and R$ 408,275,
respectively.

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23           Knowledge Retention Program

In June 2018, SABESP implemented the Knowledge Retention Program (PRC), aiming to provide personnel planning conditions
and mitigate the impact of the exit of employees who possess strategic knowledge acquired throughout their career.

The period to enroll in the Program was from July 2, 2018 to October 31, 2018; however, the final term was postponed to November
30, 2018. Employment terminations will be carried out based on a previously set schedule, during the validity of the Program, i.e.
from January 2, 2019 to December 30, 2020.

For those enrolled in the Program, the compliance with the agreements of the Collective Work Agreement effective on the date of
termination  is  thereby  guaranteed.  They  will  also  receive  a  severance  incentive  proportional  to  the  length  of  service  at  SABESP,
corresponding to a percentage of the balance of the Guarantee Fund for Length of Service (FGTS), for termination purposes, on the
date of termination, as per the table below:

Length of service at SABESP (years)

% of the Guarantee Fund for Length of Service (FGTS)

More than 15

11 - 15

6 - 10

0 - 5

40%

30%

15%

5%

In 2018, the Company recorded R$ 196,472, corresponding to the provision of compensatory payments of employees enrolled in
the Program, R$ 74,324 of which recorded under current liabilities and R$ 122,148 under noncurrent liabilities.

For employees eligible to the Consent Decree (TAC) entered into with the São Paulo State Prosecution Office in 2009 who joined
the Program, the Company reversed R$ 170,303 in 2018.

As  of  December  31,  2018  the  total  provisioned  corresponding  to  TAC  was  R$  140,818,  R$  136,293  of  which  was  recorded  under
current liabilities and R$ 4,525 under noncurrent liabilities.

24           Equity

(a)         Authorized capital

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On December 13, 2018, the Board of Directors approved a capital increase of R$ 10,000,000 to R$ 15,000,000 (authorized limit)
with capitalization of part of the investment reserve in the amount of R$ 5,000,000.

(b)         Subscribed and paid-in capital

As of December 31, 2018 and 2017, subscribed and paid-in capital was represented by 683,509,869 registered, book-entry common
shares with no par value, as follows:

December 31, 2018

December 31, 2017

Number of
shares

343,524,285

212,612,143

125,278,967

2,094,474

% 

Number of shares

% 

50,26%

31,10%

18,33%

0,31%

343,524,285

201,026,895

50,26%

29,41%

136,790,413

20,01%

2,168,276

0,32%

683,509,869

100,00%

683,509,869

100,00%

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

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%

2018

2017

2016

2,835,068

2,519,310

2,947,098

141,755

125,965

147,355

2,693,313

2,393,345

2,799,743

Minimum  mandatory  dividend  –  25%  (R$0.9851,  R$0.87539  and  R$1.0240  as  of  December  31,
2018, 2017 and 2016 per share and per ADS)

673,328

598,336

699,936

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On April 27, 2018, the Shareholders’ General Meeting approved the distribution of dividends as interest on capital amounting to R$
105,543, for the 2017 fiscal year. Therefore, the amount of R$ 53,539 related to the surplus minimum mandatory dividends of 25%,
set forth in the Bylaws, recorded in the 2017 equity under “Additional proposed dividends” was transferred to current liabilities. 
These amounts started being paid in June 2018.

The Company proposed dividends as interest on capital ad referendum of the Annual Shareholders’ Meeting of 2019, in the amount
of R$ 673,328 (R$ 598,336 in 2017) and additional proposed dividends in the amount of R$ 118,859 (R$ 105,543 in 2017), totaling
R$  792,187  (R$  703,879  in  2017),  corresponding  to  R$  1.1590  per  common  share  (R$  1.0298  in  2017),  to  be  resolved  on  the
Shareholders’ Meeting to be held on April 29, 2019. The amount exceeding the minimum mandatory dividend due in the year of R$
118,859 (R$ 105,543 in 2017) was reclassified into equity to the “Additional proposed dividends” account, this amount includes the
withholding income tax of R$58,258 (R$52,004 in 2017).

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$ 58,258 (R$ 52,004 in 2017) 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, 2018, totaling R$ 673,765 (R$ 598,612 in 2017), refers to the amount of
R$ 673,328 (R$ 598,336 in 2017) declared in 2018, net of withholding income tax and R$ 437 declared in previous years (R$ 276 in
2017).

(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, 2018 and 2017, the balance of investment reserve totaled R$3,840,422 and R$6,939,296, 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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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

2018

2017

2016

2,835,068

141,755

673,328

118,859

1,901,126

2,519,310

125,965

598,336

105,543

1,689,466

2,947,098

147,355

699,936

123,557

1.976.250

Management  will  send  for  approval  at  the  Shareholders’  Meeting,  a  proposal  to  reallocate  retained  earnings  the  amount  of
R$1,901,126 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 21 (b), the breakdown of amounts recorded in 2018 and 2017.

Balance as of December 31, 2017

Actuarial gains/(losses) for the year (Note 21 (b))

Balance as of December 31, 2018

F-121

G1

G0

Total

70,927
(211)

70,716

(609,028)
(10,783)

(619,811)

(538,101)
(10,994)

(549,095)

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25           Earnings per share

Basic and diluted

Basic earnings per share is calculated by dividing the equity attributable to the 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.

2018

2017

2016

Earnings attributable to Company’s owners

Weighted average number of common shares issued

2,835,068

2,519,310

2,947,098

683,509,869

683,509,869

683,509,869

Basic and diluted earnings per share (reais per share)

4.15

3.69

4.31

26          Operating segment information     

Management, comprised of the Board of Directors and Board of Executive Officers, has determined the operating segment used to
make strategic decisions, as sanitation services.

Result

Gross operating revenue
Gross sales deductions
Net operating revenue
Costs, selling and administrative expenses
Income from operations before other operating expenses, net and equity accounting

2018

Reconciliation to
the financial
statements (ii)
2,802,670
-
2,802,670
(2,739,657)
63,013

Sanitation (i)
14,253,609
(971,185)
13,282,424
(8,203,883)
5,078,541

Other operating income / (expenses), net

Equity accounting

Financial result, net

Income from operations before taxes

Depreciation and amortization

(1,392,541)

F-122

Balance as per
financial
statements
17,056,279
(971,185)
16,085,094
(10,943,540)
5,141,554

28,591

6,510
(1,264,336)

3,912,319

(1,392,541)

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(i) See note 33 for further information about non-cash items, other than depreciation and amortization that impact segment 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
Costs, selling and administrative expenses
Income from operations before other operating expenses, net and equity accounting

Other operating income / (expenses), net

Equity accounting

Financial result, net

Income from operations before taxes
Depreciation and amortization

F-123

2017

Reconciliation to
the financial
statements (ii)
3,150,877
-
3,150,877
(3,080,542)
70,335

Sanitation (i)
12,223,746
(766,390)
11,457,356
(7,566,104)
3,891,252

(1,301,897)

-

Balance as per
financial
statements
15,374,623
(766,390)
14,608,233
(10,646,646)
3,961,587

(5,679)

5,760
(458,054)

3,503,614
(1,301,897)

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(i) See note 33 for further information about non-cash items, other than depreciation and amortization that impact segment 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
Costs, selling and administrative expenses
Income from operations before other operating expenses, net and equity accounting

Other operating income / (expenses), net

Equity accounting

Financial result, net

Income from operations before taxes
Depreciation and amortization

F-124

2016

Reconciliation to
the financial
statements (ii)
3,732,877
-
3,732,877
(3,651,364)
81,513

Sanitation (i)
11,122,232
(756,901)
10,365,331
(7,026,699)
3,338,632

1,146,626

-

Balance as per
financial
statements
14,855,109
(756,901)
14,098,208
(10,678,063)
3,420,145

4,722

4,740
699,447

4,129,054
1,146,626

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(i) See note 33 for further information about non-cash items, other than depreciation and amortization that impact segment results,
and for additionals to long-lived asset information;

(ii) Construction revenue and related costs not reported to the CODM.

Explanation on the reconciliation items for the financial statements.

The impacts on gross operating income and costs are as follows:

2018

2017

2016

Gross revenue from construction recognized under IFRIC 12  (a)

2,802,670

3,150,877

3,732,877

Construction costs recognized under IFRIC 12 (a)

(2,739,657)

(3,080,542)

(3,651,364)

Construction margin

63,013

70,335

81,513

(a)    Revenue from concession construction contracts is recognized in accordance with Note 3.3 (b).

27           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  20  (f))  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, 2018, the Company’s insurance coverage is as follows:

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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

28          Operating revenue

(a)   Revenue from sanitation services:

Metropolitan region of São Paulo

Regional Systems

Total

Coverage

2,007,219

911,961

500,000

100,000

100,000

72,435

11,470

5,000

14

3,708,099

2018

2017

2016

10,295,509

3,958,100

8,636,926

3,586,820

7,749,694

3,372,538

14,253,609

12,223,746

11,122,232

(b)    Reconciliation between gross operating income and net operating income:

2018

2017

2016

Revenue from sanitation services (i)

14,253,609

12,223,746

11,122,232

Construction revenue

Sales tax

Regulation, Control and Oversight Fee (TRCF) (ii)

Net revenue

2,802,670

(916,808)

(54,377)

3,150,877

(757,619)

(8,771)

3,732,877

(756,901)

-

16,085,094

14,608,233

14,098,208

F-126

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(i)     Includes the amount of R$63,901 corresponding to the TRCF charged from customers from the municipalities regulated by
ARSESP.
(ii) Amount  payable  to  ARSESP  referring  to  regulation,  control  and  oversight  activities,  pursuant  to  State  Complementary  Law

1,025/07.

29          Operating costs and expenses

Operating costs

     Salaries, payroll charges and benefits

     Pension obligations

     Construction costs (Note 26)

     General supplies

     Treatment supplies

     Outsourced services

     Electricity

     General expenses

     Depreciation and amortization

Selling expenses

2018

2017

2016

(1,959,539)

(25,066)

(1,841,571)

(48,381)

(1,718,199)

131,469

(2,739,657)

(3,080,542)

(3,651,364)

(238,034)

(265,146)

(996,477)

(956,840)

(629,253)

(163,712)

(287,592)

(857,063)

(794,352)

(531,985)

(1,276,444)

(1,173,765)

(9,086,456)

(8,778,963)

(173,224)

(279,150)

(845,334)

(932,435)

(471,965)

(1,072,918)

(9,013,120)

     Salaries, payroll charges and benefits

(289,378)

(305,440)

(271,690)

     Pension obligations

     General supplies

     Outsourced services

     Electricity

     General expenses

        Depreciation and amortization

(3,602)

(6,391)

(273,470)

(1,154)

(102,213)

(17,272)

(693,480)

(7,296)

(4,451)

17,941

(3,585)

(258,287)

(278,565)

(762)

(94,112)

(15,664)

(751)

(93,180)

(9,729)

(686,012)

(639,559)

Bad debt expense, net of recoveries (Note 9 (c))

(166,727)

(82,681)

(90,488)

Administrative expenses

     Salaries, payroll charges and benefits

     Pension obligations

     General supplies

     Outsourced services

     Electricity

     General expenses

     Depreciation and amortization

     Tax expenses

Operating costs and expenses

     Salaries, payroll charges and benefits

     Pension obligations

     Construction costs (Note 26)

     General supplies

     Treatment supplies

     Outsourced services
     Electricity

mzdirect.mz-ir.com/Sabesp/2019/20F2018/v23/sbsform20f_2018.htm

(254,284)

(141,758)

(4,881)

(204,728)

(1,363)

(232,288)

(98,825)

(58,750)

(229,752)

(171,830)

(5,675)

(183,746)

(965)

(302,113)

(112,468)

(92,441)

(996,877)

(1,098,990)

(194,357)

(136,358)

(2,585)

(154,926)

(1,848)

(289,862)

(63,979)

(90,981)

(934,896)

(2,503,201)

(2,376,763)

(2,184,246)

(170,426)

(227,507)

13,052

(2,739,657)

(3,080,542)

(3,651,364)

(249,306)

(265,146)

(1,474,675)
(959,357)

(173,838)

(287,592)

(1,299,096)
(796,079)

(179,394)

(279,150)

(1,278,825)
(935,034)

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     General expenses

     Depreciation and amortization

     Tax expenses

        Bad debt expense, net of recoveries (Note 9 (c))

(963,754)

(1,392,541)

(58,750)

(166,727)

(928,210)

(1,301,897)

(92,441)

(82,681)

(855,007)

(1,146,626)

(90,981)

(90,488)

(10,943,540)

(10,646,646)

(10,678,063)

F-127

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30          Financial Income (Expenses)

Financial expenses

Interest and charges on borrowings and financing – local currency (i)

Interest and charges on borrowings and financing – foreign currency (ii)

Other financial expenses (iii)

Income tax over international remittance

Inflation adjustment on borrowings and financing (iv)

Inflation adjustment on Sabesprev Mais deficit

Other inflation adjustments (v)

Interest and inflation adjustments on provisions (vi)

Total financial expenses

Financial income

Inflation adjustment gains (vii)

Income on short-term investments (viii)

Interest income (ix)

Cofins and Pasep

Other

Total financial income

2018

2017

2016

(332,149)

(171,686)

(187,563)

(19,779)

(66,183)

-

(45,193)

14,586

(289,780)

(119,100)

(97,533)

(17,901)

(62,787)

-

(50,941)

(50,238)

(807,967)

(688,280)

105,952

187,094

175,939

(22,693)

10

446,302

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

Financial income (expenses), net before exchange rate changes

(361,665)

(362,036)

(391,181)

Net exchange gains (losses)

Exchange rate changes on borrowings and financing (x)

(915,897)

(96,300)

Exchange rate changes on assets

Other exchange rate changes

Exchange rate changes, net

Financial income (expenses), net

13,235

(9)

336

(54)

1,090,466

371

(209)

(902,671)

(96,018)

1,090,628

(1,264,336)

(458,054)

699,447

F-128

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(i) Increase of R$ 42.4 million mainly due to the lower capitalization in the investment in 2018 compared to 2017.

(ii) Increase of R$ 52.6 million due to the appreciation of the dollar and the yen against the real in 2018 (17.1% and 20.0%,

respectively), when compared to the real appreciation occurred in 2017 (1.5% and 5.3%, respectively).

(iii) The variation is due to the increase in recognition of interest on Public-Private Partnership (PPP) contracts, due to the beginning

of the the service provision of São Lourenço Production System (SPSL), on July 10, 2018.

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(iv) The monetary variation derives mainly due to the higher variation of the IPCA in 2018, compared to the variation in 2017

(3.75% and 2.95%, respectively). The exposures to this rate are shown in Note 5.1 (d).

(v) Expenses mainly related to inflation adjustments related to the commieents required by Public-Private Partnership, program

contracts commitments and agreements.

(vi) The decrease is mainly due to the reversion of provisions in 2018.

(vii) The monetary variations gains increased mainly due to the higher restatement escrow deposits.

(viii)The decrease is a result of the decrease in the CDI rate, of 6.89% p.a. in 2017 and 6.42% p.a. in 2018.

(ix) The R$ 118,773 increase in interest income is mainly due to the recognition of interest on installment agreements with customers,

in 2018.

(x) The change in expenses mainly reflects the appreciation of the U.S. dólar and the Yen against  the Real in 2018 (17.1% and 20.0%,

respectively), compared to appreciation presented in 2017 (1.5% and 5.3, respectively).

31           Other operating income (expenses), net

2018

2017

2016

Other operating income, net

Other operating expenses

93,089

(64,498)

75,410

(81,089)

62,570

(57,848)

Other operating income (expenses), net

28,591

(5,679)

4,722

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, net of Cofins and Pasep.

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.

32          Commitments

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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, 2018:

Contractual obligations –
Expenses
Contractual obligations –
Investments

Total

1 year

1-3 years

3-5 years

More than 5
years

Total

1,521,921

2,675,326

4,197,247

801,136

282,192

1,107,121

3,712,370

2,213,620

3,014,756

1,009,148

1,291,340

5,737,495

6,844,616

11,635,589

15,347,959

The main commitment refers to the São Lourenço PPP. See Note 15 (g).

33          Supplemental cash flow information

Total additions of contract assets (Note 14)

Total additions to intangible assets (Note 15 (b))

2018

2017

2016

3,188,943

-

-

1,144,728

3,490,298

3,855,831

Items not affecting cash (see breakdown below)

(2,201,112)

(1,532,518)

(1,747,664)

Total additions to intangible assets as per statement of cash flows

2,132,559

1,957,780

2,108,167

Investment and financing operations affecting intangible assets but not cash:

Interest capitalized in the year (Note 15 (d))

Contractors payable

Program contract commitments

Public Private Partnership - São Lourenço PPP (Note 15 (g))

Leases

Construction margin (Note 26)

Agreement signed with the municipality of Guarulhos (Note 9 (a))

Total

F-131

488,502

297,872

149,974

273,737

-

63,013

928,014

649,048

213,340

95,126

501,591

3,078

70,335

-

700,743

57,431

4,262

893,181

10,534

81,513

-

2,201,112

1,532,518

1,747,664

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP

34          Events after the reporting period

         ·      São Bernardo do Campo

On March 12, 2019, the Executive Body (Poder Executivo Municipal) of São Bernardo do Campo submitted the Proposed Bill to the
Municipal Chamber (Câmara Municipal) with the purpose of signing the Contract for the Provision of Public Services between the
Municipality, the State of São Paulo, and Sabesp, in order to adjust the current contract to the current legislation. 

The contract that enables the Company to provide services to the municipality of São Bernardo was celebrated in December 2003,
i.e.,  prior  to  the  Federal  Law  No.  11,445  of  2007.  Considering  that  this  Law  establishes  specific  rules  and  conditions  to  contract
basic sanitation services, there is a need to adjust the contract to comply with this legislation. 

·      Santo André

On March 20, 2019, was executed a Protocol of Intentions with the municipality of Santo André for the preparation of studies and
evaluations aiming to resolve commercial relations and existing debts between the municipality and the Company.

2ND Ordinary Tariff Revision

On May 24, 2018, in view of the result of the Second Ordinary Tariff Revision, the Company filed with ARSESP: (i) a request for
reconsideration; and (ii) a request for clarification and revision. In the request for clarification and review, the Company requests
revision of the value of the revenue of the city of São Paulo used to calculate the financial component referring to municipal funds.

In reply, on February 28, 2019 ARSESP decided not to accept the request for reconsideration (administrative appeal). Regarding
the request for clarification and revision, the ARSESP decided for its partial approval, which will imply an index of 0.8408%, to be
applied at the same time of the annual tariff adjustment (May 2019).

Payment of debentures

The Company paid the installment corresponding to the 17th debenture issue, in the amount of R$ 279,797, in January 2019, settled
the 15th debenture issue, in the amount of R$ 361,593, in February 2019, and prepaid the 20th debenture issue, in the amount of
R$ 250,000, in March 2019

23th Issuance of Debentures

On  April  8,  2019,  was  approved  the  23th  issuance  of  simple,  unsecured  and  non-convertible  debentures,  in  up  to  two  series,  for
public distribution, with restricted placement efforts, pursuant to CVM Rule No. 476, dated as of January 16, 2009, as amended, in
the  total  amount  of  up  to  R$  1,500,000,000.00  (one  billion  and  five  hundred  million  reais),  being  the  Offer  conditioned  to  the
issuance  of,  at  least,  750,000  (seven  hundred  and  fifty  thousand)  Debentures,  in  the  total  amount  of  R$750,000,000.00  (seven
hundred and fifty million reais). The issuance and the number of Debentures to be placed in each serie, the remuneration of the
Debentures and the total amount of the Offer will be defined according to the bookbuilding process, in the communicating vessels
system.

Tariff readjustment

On  April  10,  2019,  São  Paulo  State  Energy  and  Sanitation  Regulatory  Agency  (ARSESP  -  Agência  Reguladora  de  Saneamento  e
Energia do Estado de São Paulo) published Resolution No. 859 authorizing the Company to apply a tariff readjustment of 4.7242%
to its current tariffs, comprised of: 

IPCA variation in the period of 4.5754%;
Efficiency factor (X Factor) of 0.6920%; and
Compensatory adjustment of 0.8408%, as described in Technical Note NT.F-0010-2018.

F-132

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exhibit12_1.htm - Generated by SEC Publisher for SEC Filing

Page 1 of 1

CERTIFICATION

EXHIBIT 12.1

I, Benedito Pinto Ferreira Braga Junior, certify that:

1.

I have reviewed this annual report on Form 20-F of Companhia de Saneamento Básico do Estado de São Paulo -
Sabesp;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report fairly present 
in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the 
periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and 
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have: 
a. designed   such   disclosure   controls   and   procedures   or   caused   such   disclosure   controls   and   procedures   to   be 
designed   under   our   supervision,   to   ensure   that   material   information   relating   to   the   company,   including   its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in 
which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to 
be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting 
and   the   preparation   of   financial   statements   for   external   purposes   in   accordance   with   generally   accepted 
accounting principles;

c. evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our 
conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered 
by this report based on evaluation; and

d. disclosed in this report any change in the company’s internal control over financial reporting that occurred during 
the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, 
the company’s internal control over financial reporting.

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control 
over financial reporting, to the company’s auditors and to the audit committee of the company’s board of directors (or 
persons performing the equivalent function):
a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial 
reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and 
report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in 

the company’s internal control over financial reporting.

Date:  April 26, 2019

By:          /s/  Benedito Pinto Ferreira Braga Junior        
Name:    Benedito Pinto Ferreira Braga Junior
Title:      Chief Executive Officer

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exhibit12_2.htm - Generated by SEC Publisher for SEC Filing

Page 1 of 2

EXHIBIT 12.2

I, Rui de Britto Álvares Affonso, certify that:

CERTIFICATION

1.

I  have  reviewed  this  annual  report  on  Form  20-F  of  Companhia  de  Saneamento  Básico  do  Estado  de  São  Paulo  -
Sabesp;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material 
fact necessary to make the statements made, in light of the circumstances under which such statements were made, not 
misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report fairly present in 
all  material  respects  the  financial  condition,  results  of  operations  and  cash  flows  of  the  company  as  of,  and  for,  the 
periods presented in this report;

4. The company’s other certifying officer  and I are responsible for establishing and maintaining  disclosure controls and 
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as 
defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have: 
a) designed such disclosure controls and procedures or caused such disclosure controls and procedures to be designed 
under  our  supervision,  to  ensure  that  material  information  relating  to  the  company,  including  its  consolidated 
subsidiaries, is made known to us by others within those entities, particularly during the period in which this report 
is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be 
designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and 
the  preparation  of  financial  statements  for  external  purposes  in  accordance  with  generally  accepted  accounting 
principles;

c) evaluated  the  effectiveness  of  the  company’s  disclosure  controls  and  procedures  and  presented  in  this  report  our 
conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by 
this report based on evaluation; and

d) disclosed in this report any change in the company’s internal control over financial reporting that occurred during 
the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the 
company’s internal control over financial reporting.

5. The  company’s  other  certifying  officer  and  I  have  disclosed,  based  on  our  most  recent  evaluation  of  internal  control 
over financial reporting, to the company’s auditors and to the audit committee of the company’s board of directors (or 
persons performing the equivalent function):
a) all  significant  deficiencies  and  material  weaknesses  in  the  design  or  operation  of  internal  control  over  financial 
reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and 
report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the 

company’s internal control over financial reporting.

Date:  April 26, 2019

By:          /s/   Rui de Britto Álvares Affonso        
Name:    Rui de Britto Álvares Affonso
Title:      Chief Financial Officer and Investor Relations Officer

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Page 1 of 1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.1

In  connection  with  the  Annual  Report  of  Companhia  de  Saneamento  Básico  do  Estado  de  São  Paulo  - Sabesp  (the 
"Company") on Form 20-F for the fiscal year ended December 31, 2018, as filed with the U.S. Securities and Exchange 
Commission on the date hereof (the "Report"), I, Benedito Pinto Ferreira Braga Junior, Chief Executive Officer, certify, 
pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the U.S. Sarbanes Oxley Act of 2002, that to 
the best of my knowledge:  

(i)

(ii)

the Report fully complies with the requirements of section 13(a) or 15(d) of the U.S. Securities Exchange Act 
of 1934; and

the  information  contained  in  the  Report  fairly  presents,  in  all  material  respects,  the  financial  condition  and 
results of operations of the Company.

Date:  April 26, 2019

By:          /s/Benedito Pinto Ferreira Braga Junior        
Name:    Benedito Pinto Ferreira Braga Junior 
Title:      Chief Executive Officer

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exhibit13_2.htm - Generated by SEC Publisher for SEC Filing

Page 1 of 1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.2

In  connection  with  the  Annual  Report  of  Companhia  de  Saneamento  Básico  do  Estado  de  São  Paulo  – Sabesp  (the 
“Company”) on Form 20-F for the fiscal year ended December 31, 2018, as filed with the U.S. Securities and Exchange 
Commission on the date hereof (the “Report”), I, Rui  de Britto Álvares Affonso, Chief Financial  Officer and Investor 
Relations Officer, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the U.S. Sarbanes 
Oxley Act of 2002, that to the best of my knowledge: 

(i)

(ii)

the Report fully complies with the requirements of section 13(a) or 15(d) of the U.S. Securities Exchange 
Act of 1934; and

the information contained in the Report fairly presents, in all material respects, the financial condition and 
results of operations of the Company.

Date:  April 26, 2019

By:          /s/ Rui de Britto Álvares Affonso      
Name:    Rui de Britto Álvares Affonso
Title:      Chief Financial Officer and Investor Relations Officer

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