Tetra Tech Wins $600 Million USAID Global Architect-Engineer Services Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it was awarded a global indefinite delivery, indefinite quantity contract for architect-engineer (A-E) services with the U.S. Agency for International Development (USAID). The ceiling under this five-year, multiple-award contract is $600 million. USAID administers the U.S. foreign assistance program providing economic and humanitarian assistance in more than 80 countries worldwide.

Tetra Tech will provide A-E services including design, construction supervision, and related services to develop vitally important infrastructure in developing countries. Tetra Tech will support USAID in providing access to clean water, sanitation, health care, schools, energy, and transportation infrastructure, while helping to build local capacity, strengthen local institutions, empower women, and promote long-term sustainability.

“Tetra Tech is proud of our 40 years of service to USAID, and we are honored to have been selected for this important USAID contract,” said Dan Batrack, Tetra Tech’s Chairman and CEO. “Projects under this contract combine our international development experience and our expertise in engineering and infrastructure development to provide innovative solutions that improve the quality of life in the developing world.”

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. For more information on Tetra Tech, please visit www.tetratech.com, follow us on Twitter (@TetraTech), or like us on Facebook.

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 Relations(626) 470-2844