Tetra Tech Awarded $200 Million Multiple-Award U.S. Navy Remediation Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that its Tetra Tech EC subsidiary was one of four firms selected for a $200 million Environmental Multiple Award Contract (EMAC) for environmental remediation services at U.S. Navy, Marine Corps, and other Department of Defense locations primarily in California and the southwestern United States. The EMAC supports the Naval Facilities Engineering Command (NAVFAC) Southwest and NAVFAC Atlantic areas of responsibility to include the U.S. trust territories of Puerto Rico and Guam.

The EMAC focuses on restoration projects at environmentally contaminated sites. Tetra Tech EC will perform remedial actions, removal actions, and remedial design; operation and maintenance services; pilot and treatability studies; and other related activities. This indefinite delivery/indefinite quantity contract is a firm-fixed-price contract of a base year and four one-year options.

“Tetra Tech is pleased to continue to support the U.S. Navy in its critical environmental remediation mission,” said Dan Batrack, Tetra Tech’s Chairman and CEO.

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 13,000 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.

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