General Services Administration (GSA) contracts provide convenient access for all U.S. government agencies to the wide variety of services that Tetra Tech and our subsidiaries offer.

Examples of these services include environmental compliance, waste management services, remediation, energy management, project management, information technology, and strategic planning. Relevant contracts and contact information are provided in the major categories listed below.

Browse Tetra Tech's GSA schedules, GWACs, or MATOCs by category below, or search for Tetra Tech on GSA's eLibrary website to order services online.

View our U.S. Department of Defense Contract Directory.

OASIS is a Multiple Award, Indefinite Delivery, Indefinite Quantity (MA-IDIQ) contract vehicle that provides flexible and innovative solutions for complex professional services.

Services under OASIS are awarded under seven North American Industry Classification System (NAICS) pools. Tetra Tech was awarded three contracts for work in NAICS Pools 1, 3, and 4. Work may cross over multiple disciplines and span many areas of expertise with task orders being assigned in the NAICS pool with the greatest percentage of anticipated requirements.

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