Tetra Tech Awarded $38 Million Planning and Environmental Studies MATOC with USACE Sacramento District

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a $38 million contract with the U.S. Army Corps of Engineers (USACE) Sacramento District. The contract covers civil works and military planning services across several states in the western United States. Tetra Tech will provide a wide range of planning and analysis services for water resource and levee programs, ecosystem restoration, flood risk management, and environmental support projects, among other programs. Three firms will share in the total contract value for this Multiple Award Task Order Contract (MATOC), which has one base year and four option years.

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, program management, construction, and technical services addressing the resource management and infrastructure markets. The Company supports government and commercial clients by providing innovative solutions focused on water, the environment, and energy. With more than 10,000 employees worldwide, Tetra Tech’s capabilities span the entire project life cycle.

Any statements made in this release that are not based on historical fact are forward-looking statements. Any forward-looking statements made in this release represent management’s best judgment as to what may occur in the future. However, Tetra Tech’s actual outcome and results are not guaranteed and are subject to certain risks, uncertainties and assumptions ("Future Factors"), and may differ materially from what is expressed. For a description of Future Factors that could cause actual results to differ materially from such forward-looking statements, see the discussion under the section "Risk Factors" included in the Company’s Form 10-K and 10-Q filings with the Securities and Exchange Commission.