PASADENA, Calif. — (BUSINESS WIRE) — July 27, 2015 — Tetra Tech, Inc. (NASDAQ: TTEK) announced today it was one of a group of companies awarded an indefinite delivery, indefinite quantity contract by the U.S. Air Force for architectural-engineering services worldwide. The contract value could reach $950 million. These services will support the U.S. Air Force’s design and construction programs, including the development of sustainment, restoration, and modernization program areas.

Tetra Tech will provide technical support to develop the required infrastructure including potable water supplies, utility systems, and transportation networks. Under this program, Tetra Tech will collect and analyze geospatial data, develop and apply decision-support tools for master planning efforts, conduct field surveys, and design facilities incorporating sustainable and LEED-certified elements to the extent possible. The base contract period is five years with two option years.

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 Relations
Charlie MacPherson, Media & Public Relations
626-470-2844