Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded an $18.6 million contract to help the U.S. Agency for International Development (USAID) increase access to renewable energy sources and improve energy efficient practices in Colombia through a combination of project development support, technical assistance, and other activities to promote economic investment. The Colombia Clean Energy Program (CCEP) is USAID/Colombia's flagship clean energy activity and supports the Presidential Initiative on Climate Change and the whole-of-government Enhancing Capacity - Low Emissions Development Strategy (EC-LEDS).

Under this new program, Tetra Tech will help USAID develop Colombia's technical and institutional capacity in clean energy, with a special focus on expanding energy access in remote areas. With improved environmental governance, support for community-scale rural electrification projects, and new efforts to catalyze local renewable energy investment, USAID aims to create economic development opportunities for thousands of rural Colombia residents.

Tetra Tech will provide a variety of implementation support services for CCEP including technical and economic analysis, renewable energy resource assessments, training, outreach, and advisory services.

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 13,000 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.

Tetra Tech, Inc.
Jim Wu, Investor Relations
Talia Starkey, Media & Public Relations
626-470-2844