Tetra Tech, Inc. engages in the provision of consulting and engineering services. The company is headquartered in Pasadena, California and currently employs 21,000 full-time employees. Its segments include government services group (GSG) and commercial/international services group (CIG). Its GSG segment provides consulting and engineering services to United States (U.S.) government clients (federal, state, and local) and development agencies. GSG supports U.S. government, civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology, and disaster management. Its CIG segment provides consulting and engineering services to U.S. commercial clients, and international clients that include both commercial and government sectors. CIG supports commercial clients across the Fortune 500. The company also provides application cybersecurity, systems engineering, financial management and program management support on over 30 federal government programs.