Tetra Tech Awarded $240 Million Multiple Award U.S. Navy Remediation Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that Tetra Tech EC was one of six firms selected for a $240 million multiple-award contract for environmental remediation of radiological contaminants (RADMAC II) at various Navy and Marine Corps installations in California, Arizona, Nevada, Colorado, New Mexico, Utah, and other locations throughout the United States. RADMAC II supports the Naval Facilities Engineering Command (NAVFAC) Southwest and NAVFAC Atlantic areas of responsibility.

RADMAC II will focus on restoration projects at radiologically contaminated sites. Tetra Tech EC will perform radiological investigations, surveys and sampling analysis, pilot and treatability studies, operations and maintenance, remediation, and other related activities associated with returning sites to safe use. RADMAC II is a follow-on contract to RADMAC I, in which Tetra Tech EC also provided technical services for the Navy’s remediation programs in California and Washington.

“Tetra Tech has supported the U.S. Navy for over four decades, and specifically NAVFAC Southwest, in remediation of radiological contaminants for more than 12 years,” said Dan Batrack, Tetra Tech’s Chairman and CEO. “We are pleased to continue this longstanding partnership with the U.S. Navy to support its critical environmental restoration efforts.”

About Tetra Tech

Tetra Tech is a leading, global provider of consulting and engineering services. We are differentiated by Leading with Science to provide innovative technical solutions to our clients. We support global commercial and government clients focused on water, environment, infrastructure, resource management, energy, and international development. With 16,000 associates worldwide, Tetra Tech provides clear solutions to complex problems. For more information about Tetra Tech, please visit tetratech.com, follow us on Twitter (@TetraTech), or like us on Facebook.

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 Relations(626) 470-2844