Tetra Tech Wins Multiple Award Military Munitions Contract by U.S. Army Corps of Engineers Baltimore District

Tetra Tech, Inc. (NASDAQ: TTEK) announced today it was awarded a prime contract by the U.S. Army Corps of Engineers (USACE), Baltimore District, to provide military munitions environmental services for Military Munitions Response Program projects managed by the USACE Baltimore District. The multiple award, indefinite delivery, indefinite quantity contract has a five year period of performance and a contract value of approximately $240 million for all awardees.

As part of its services, Tetra Tech will safely locate, identify, and recover any munitions and explosives of concern, as well as provide support to protect human health and the environment from hazards associated with military munitions.

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, program management, and construction management services. The Company supports commercial and government clients focused on water, environment, infrastructure, resource management, and energy. With 13,000 staff worldwide, Tetra Tech provides clear solutions to complex problems.

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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Tetra Tech, Inc.Jim Wu, Investor RelationsCharlie MacPherson, Media & Public Relations626-470-2844