Tetra Tech Awarded $3 Billion Program Ceiling Contract to Support Air Force Center for Engineering and the Environment

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it is one of multiple contractors awarded the U.S. Air Force Center for Engineering and the Environment (AFCEE) 4P A-E 08 contract with a program ceiling of $3 billion. Under this five-year, indefinite delivery/indefinite quantity contract, Tetra Tech will provide architect-engineering (A-E) services to administer, coordinate, and technically support environmental, military construction, military family housing, and facility sustainment, restoration, and modernization (SRM) programs of interest to the government worldwide. Tetra Tech has held AFCEE’s previous 4P A-E contract since 2003. The new program ceiling is larger than the previous program ceiling and will support an expanded scope of work. The contract includes A-E services to support environmental and traditional programs, including environmental restoration, environmental conservation and planning, environmental quality, design and construction, plans and programs, and other areas of support and emerging markets. About Tetra Tech (www.tetratech.com) Tetra Tech is a leading provider of consulting, engineering, and technical services. With approximately 8,500 associates located in the United States and internationally, the Company supports commercial and government clients in the areas of resource management and infrastructure. Tetra Tech’s services include research and development, applied science and technology, engineering design, program management, construction management, construction, and operations and maintenance. 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.