U.S. Air Force Awards $48M Environmental Services Contract to Tetra Tech

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that the U.S. Air Force in Europe (USAFE) has awarded the Company a $48 million, multiple-award contract to provide environmental services to support Air Force installations throughout Europe.

Under the indefinite delivery/indefinite quantity contract, Tetra Tech will support USAFE to conduct monitoring, sampling, and analysis activities to ensure compliance for multimedia including water, air emissions, and soils. The Company will also perform assessments, baseline surveys, pollution prevention activities, environmental remediation, and other compliance-related services to support U.S. Air Force operations in Europe. The contract has a five-year ordering period with three additional years for execution.

“Tetra Tech has supported Air Force environmental programs in Europe for the past 15 years, working at military installations in more than 14 countries,” said Dan Batrack, Tetra Tech's Chairman and CEO. “We are pleased to continue supporting the Air Force’s mission under this new contract.”

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