Tetra Tech Inc., together with its subsidiaries, provides consulting, engineering, program management, construction management, and technical services for water, natural resources, environment, infrastructure, and energy sectors. The company operates in four segments: Engineering and Consulting Services (ECS), Technical Support Services (TSS), Engineering and Architecture Services (EAS), Remediation and Construction Management (RCM). The ECS segment offers front-end science, consulting engineering, and project management services in the areas of surface water management, groundwater, waste management, mining and geotechnical sciences, arctic engineering, industrial processes, and information technology. The TSS segment provides management consulting and strategic direction in the areas of environmental assessments/hazardous waste management, climate change, international development/stabilization, energy services, and technical government staffing services. The EAS segment offers engineering and architecture design services, including leadership in energy and environmental design (LEED) and sustainability services, together with technical and program administration services for projects related to water infrastructure, buildings, and transportation and facilities. The RCM segment provides environmental remediation, infrastructure development, and alternative energy services. The company offers its services to the U.S. federal, state, and local government agencies, as well as to commercial and international clients. Tetra Tech, Inc. was founded in 1966 and is headquartered in Pasadena, California.

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