Tetra Tech, Inc. engages in the provision of consulting and engineering services. It operates through the following segments: Government Services Group (GSG); Commercial and International Services Group (CIG); and Remediation and Construction Management (RCM). The GSG segment offers consulting and engineering services primarily to United States government clients such as federal, state and local, and development agencies worldwide. The CIG segment includes infrastructure and related environmental and geotechnical services, testing, engineering, and project management services to commercial and local government clients across Canada. The RCM segment focuses on the results of the wind-down of its non-core construction activities. The company was founded in 1966 and is headquartered in Pasadena, CA.