Tetra Tech, Inc. (NASDAQ:TTEK), a leading provider of high-end consulting and engineering services in water, environment, and sustainable infrastructure, announced today that the Company was awarded a $100 million multiple-award contract to provide planning and assessment services to support Air Force Civil Engineer Center (AFCEC) projects.

Under the 5-year contract, Tetra Tech's engineers, scientists, and technical specialists will support AFCEC in the development of new and resilient infrastructure for our Air Force bases, through assessing the environmental impacts of projects, conducting mitigation planning, and developing environmental impact statements. Our teams will combine advanced subject matter expertise with in-house Tetra Tech Delta technologies to conduct surveys, perform analyses, and develop innovative predictive models related to airspace; air quality, noise, and acoustics; cultural, biological, and natural resources including water resources; hazardous waste; and land use and infrastructure.

"The U.S. Air Force Civil Engineer Center has been providing effective engineering solutions that strengthen U.S. military infrastructure for more than 30 years," said Dan Batrack, Tetra Tech Chairman and CEO. "We look forward to continuing to use our Leading with Science^® approach to provide innovative, efficient solutions for critical Air Force and Space Force projects."

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 Selected for $100 Million Multiple-Award Environmental Services Contract