Tetra Tech Awarded $48 Million EPA Superfund Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a new contract to support the U.S. Environmental Protection Agency’s regional Superfund Program throughout a six-state region that includes Illinois, Indiana, Wisconsin, Minnesota, Michigan, and Ohio. Through the EPA Region 5 Superfund Technical Assessment and Response Team (START) contract, Tetra Tech will provide advisory and assistance services to EPA on-scene coordinators and other federal officials implementing EPA’s responsibilities under the National Response System. This $48 million, single-award contract has a five-year period of performance.

Specific tasks to be performed include emergency response support, removal actions, emergency preparedness and prevention activities, Superfund and brownfields site assessments, data management, and training.

“With this contract, Tetra Tech now supports EPA’s emergency response and other START program activities in nearly 20 states across the country,” said Dan Batrack, Tetra Tech Chairman and CEO. Since 1995, Tetra Tech has worked on a total of 18 EPA START contracts.

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 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.