Tetra Tech Wins $69 Million in Sustainable Water Projects with USAID

Tetra Tech, Inc. (NASDAQ:TTEK) announced today that it has been awarded two new task orders to lead sustainable water projects in rural Afghanistan and sub-Saharan Africa. The task orders will be executed under a U.S. Agency for International Development (USAID) Water IQC II contract held by ARD, Inc., a Tetra Tech company. The combined ceiling values of these two task orders, including option years, is more than $69 million. USAID has obligated about $20 million worth of funding for these efforts to date.

"One of the first needs to be addressed in developing countries is supplying clean water,” said Dan Batrack, Tetra Tech’s Chairman and CEO. "We are pleased to have been chosen by USAID to support its mission in these important regions of the world.”

The new programs focus on bringing water services to poor communities in both rural and urban settings. The three-year, $51.8 million Afghanistan Sustainable Water Supply and Sanitation (SWSS) project will include technical assistance, installation and maintenance of clean water delivery systems, and health and hygiene outreach. The four-year, $17.7 million Sustainable Water & Sanitation in Africa (SUWASA) project seeks to strengthen governance systems and foster reform in water and sanitation utilities in sub-Saharan Africa.

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 more than 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.