NASA Awards Tetra Tech $375 Million Environmental Restoration and Compliance Contract

Tetra Tech, Inc. (NASDAQ: TTEK), a leading provider of high-end consulting and engineering services, announced today that the National Aeronautics and Space Administration (NASA) has awarded the Company a $375 million, multiple-award contract to provide environmental restoration and compliance services at facilities throughout the United States.

Under the five-year contract, Tetra Tech will provide technical support services using state-of-the-art technologies and sustainable design elements to assess and restore contaminated sites and improve climate resiliency. Tetra Tech engineers and technical specialists will use our Tetra Tech Delta technology solutions to conduct sampling, prepare risk assessments, develop predictive models, and design remedial strategies for contaminated groundwater and soils.

“Tetra Tech has been Leading with Science^® to provide outstanding technical services to NASA for more than 20 years,” said Dan Batrack, Tetra Tech Chairman and CEO. “We are pleased to continue using the latest tools and technologies to deliver innovative solutions to restore properties and support critical environmental needs at NASA sites.”

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 28,000 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.

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