USAID Awards Tetra Tech $20 Million Oceans and Fisheries Partnership Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that the U.S. Agency for International Development (USAID) awarded the Company a $20 million contract to improve fisheries management and enhance the health and resilience of Southeast Asia’s marine ecosystems. The region depends heavily on marine and coastal fisheries for food and economic growth, and fish stocks are in a state of decline. To make informed management decisions, countries need additional data regarding fisheries, including catch data and information on related economic, social, and environmental pressures.

Under the five-year USAID Oceans contract, Tetra Tech will support the development of a regional electronic Catch Documentation and Traceability (e-CDT) system for sustainable fisheries. The e-CDT will provide a platform to collect and analyze environmental and economic data. Tetra Tech will train local and regional institutions to use the e-CDT to improve fisheries using an ecosystem approach to fisheries management.

“Tetra Tech is pleased to continue more than two decades of support to USAID in their mission to improve fisheries management and conserve marine resources and biodiversity in Southeast Asia,” 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 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