Tetra Tech Wins $500 Million National Design-Build Contract with the U.S. Coast Guard

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that the TtEC-Tesoro Joint Venture was awarded a National Multiple Award Construction Contract (NMACC) with the U.S. Coast Guard that has a ceiling up to $500 million. The new contract will be used to execute construction and design-build projects at U.S. Coast Guard installations and U.S. Department of Homeland Security facilities across the United States and U.S. territories. The NMACC may include a variety of operational, waterfront, housing, and medical facilities, among other projects. Four other contractors were each awarded contracts with $500 million ceilings under this $2.5 billion total capacity, seven-year, indefinite delivery/indefinite quantity contract.

Tetra Tech’s CEO, Dan Batrack, said, "This contract represents a significant expansion in our contracting capacity for the U.S. Coast Guard and U.S. Department of Homeland Security.”

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.