Tetra Tech Awarded $800 Million Multiple Award Task Order Contract for PFAS Remediation

Tetra Tech, Inc. (NASDAQ: TTEK), a leading provider of high-end consulting and engineering services, announced today that the U.S. Army Engineering Support Center, Huntsville, has selected the Company for a multiple-award, five-year, $800 million indefinite delivery, indefinite quantity contract to remove and replace aqueous film forming foam (AFFF) containing per- and poly-fluoroalkyl substances (PFAS) from fire suppression systems at installations throughout the United States.

For decades AFFF has been used in facility fire suppression systems and fire training facilities. Although extremely effective, AFFF is a major source of PFAS contamination that has been shown to be toxic to human and animal health, is persistent in the environment, and has the potential for bioaccumulation. Tetra Tech’s industry-leading environmental management experts will apply best practices from past successful AFFF remediation and removal projects to safely identify, recover, evaluate, assess, decontaminate, and dispose of AFFF containing PFAS. Our teams will evaluate the use of innovative technologies, including Tetra Tech’s proprietary PFAScrub^® cleaning agent and performance verification methods, to remove residual PFAS from the interior of fire suppression systems to minimize cross contamination from legacy AFFF systems.

“Tetra Tech has supported the U.S. Department of Defense for decades to safely address potentially harmful chemicals at its bases and in the surrounding environment,” said Dan Batrack, Tetra Tech Chairman and CEO. “We look forward to using our Leading with Science^® approach to support the proactive removal and replacement of AFFF containing PFAS in firefighting systems, keeping our servicemembers safe and preventing future environmental contamination and cleanup.”

About Tetra Tech

Tetra Tech is a leading provider of high-end consulting and engineering services for projects worldwide. With 27,000 employees working together, Tetra Tech provides clear solutions to complex problems in water, environment, sustainable infrastructure, renewable energy, and international development. We are Leading with Science^® to provide sustainable and resilient solutions for our clients. For more information about Tetra Tech, please visit tetratech.com or follow us on LinkedIn, Twitter, 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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