Tetra Tech Awarded $75 Million Environmental Planning Services Contract For U.S. Navy

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it was one of three firms awarded a $75 million, multiple award, indefinite delivery/indefinite quantity contract to provide natural resources monitoring, management, compliance, and related environmental planning services for the U.S. Navy. Issued by the Naval Facilities Engineering Command (NAVFAC) Atlantic, this contract supports the Navy's primary environmental planning program covering the Atlantic area of responsibility, which includes the continental United States, Europe, southwest Asia, and the Caribbean. The contract has one base year and four one-year options. Tetra Tech has worked for NAVFAC Atlantic for the past five years under the predecessor contract.

About Tetra Tech ( www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services. The Company supports government and commercial clients by providing innovative solutions to complex problems focused on water, environment, energy, infrastructure, and natural resources. With more than 14,000 staff 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.

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