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 City of Bartlesville, Oklahoma, has awarded Tetra Tech a contract to provide engineering design and technical services for the first indirect potable reuse (IPR) project to be permitted within the State of Oklahoma.

Building upon Tetra Tech’s initial IPR pilot study, Tetra Tech engineers and technical specialists will now design innovative IPR solutions to expand the Chickasaw Wastewater Treatment Plant’s capacity by 15 percent. Tetra Tech will use advanced treatment processes to treat up to 50 percent of daily wastewater flows which will be redirected several miles upstream into the Caney River to be recaptured, retreated, and distributed through the City’s water system during times of extreme drought.

“Tetra Tech is pleased to partner with the City of Bartlesville on this innovative project, the first indirect potable reuse facility in Oklahoma,” said Dan Batrack, Tetra Tech Chairman and CEO. “We will use our Leading with Science® approach to deliver advanced water reuse solutions that help extend Bartlesville's water supply by up to 40 years and support the State of Oklahoma’s forward-looking ‘Water for 2060’ goals.”

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 30,000 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, design sustainable and resilient infrastructure, and support the clean energy transition. 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.

Jim Wu, Investor Relations Charlie MacPherson, Media & Public Relations (626) 470-2844

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