Tetra Tech, Inc. (NASDAQ:TTEK), a leading provider of high-end consulting and engineering services in water, environment, and sustainable infrastructure, announced today that Naval Facilities Engineering Systems Command (NAVFAC) Southeast has selected Tetra Tech and its joint venture (JV) partner Mason & Hanger for a $99 million single-award task order contract to provide multidiscipline architect-engineer services for projects in the NAVFAC Southeast area of operations.

Under the 5-year contract, the Tetra Tech JV will provide comprehensive engineering, design, and technical services to support resilient military infrastructure projects, including refurbishment of waterfront and marine facilities, other shore-based facilities, and non-military construction projects. We will leverage in-house technology to conduct advanced analyses and design innovative solutions to maximize water and energy efficiency of buildings and assess and protect water resources and ecosystems.

"Tetra Tech has supported NAVFAC Southeast in their mission to deliver vital infrastructure to support the U.S. Navy for 40 years," said Roger Argus, Tetra Tech Chief Executive Officer. "We look forward to continuing to use our Leading with Science^® approach to modernize critical military base infrastructure and increase the resiliency of U.S. national security facilities."

About Tetra Tech

Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end consulting and engineering services for projects worldwide. With more than 25,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science^® to address the entire water cycle, protect and restore the environment, and design sustainable and resilient infrastructure. For more information about Tetra Tech, please visit tetratech.com or follow us on LinkedIn and 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 Form 10-Q filings with the Securities and Exchange Commission.

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Jim Wu, Investor Relations

Charlie MacPherson, Media & Public Relations

(626) 470-2844

Tetra Tech Joint Venture Awarded $99 Million U.S. Navy A-E Services Contract