Tetra Tech EC Awarded $250 Million Environmental Remediation Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that its Tetra Tech EC subsidiary is one of five contractors that has been awarded a contract for remediation of radiological contaminants at various locations within the U.S. Naval Facilities Engineering Command, Southwest and Atlantic areas of responsibility, and U.S. Department of Defense (DoD) locations nationwide. The maximum dollar value, including the base period and four option years, for all five contracts combined is $250 million.

"Tetra Tech is pleased to continue to support the DoD’s environmental mission, including its Base Realignment and Closure (BRAC) and Installation Restoration Program (IRP) activities,” 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, 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 approximately 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.