Pasadena-based Tetra Tech, Inc. is a global provider of engineering and consulting services, operating through two distinct segments: the Government Services Group (GSG) and the Commercial/International Services Group (CIG). The GSG segment offers a range of services including environmental monitoring, waste management, water management, civil infrastructure design, and government consulting, among others. Additionally, the segment provides emissions management, climate change, and energy consulting services. The segment serves federal, state, and local governments, along with various development agencies. The CIG segment provides similar services to natural resources, energy, and utility markets, along with sustainable infrastructure design services. Tetra Tech was founded in 1966 and continues to offer vital services across the world.