U.S. EPA Office of Research and Development Awards Tetra Tech $60 Million Environmental Assessment Contract

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that the U.S. Environmental Protection Agency’s Office of Research and Development (ORD) awarded the Company a contract valued at $60 million. Under this five-year, single-award contract, Tetra Tech will provide comprehensive technical and analytical services to evaluate ecological and human health risks in freshwater, marine, and terrestrial ecosystems.

Tetra Tech’s researchers will provide technical support services to ORD’s National Center for Environmental Assessment to develop and evaluate tools that are used by decision-makers in safeguarding public health and the environment. These tools include dynamic water quality, biogeochemical, and pollutant transport models that simulate impacts ranging from large scale global changes as well as regional and local land-use changes and best management practices. Tetra Tech will perform statistical, economic, and spatial analyses to assess vulnerability and resilience to various environmental factors. In addition, Tetra Tech will design and maintain databases that support digital access and data analytics to facilitate analyses by ORD scientists.

“For over 30 years, Tetra Tech has supported EPA’s research programs,” said Dan Batrack, Tetra Tech Chairman and CEO. “We are pleased to continue our support of the EPA by developing innovative methods grounded in science that protect public health and the environment.”

About Tetra Tech

Tetra Tech is a leading, global provider of consulting and engineering services. We are differentiated by Leading with Science® to provide innovative technical solutions to our clients. We support global commercial and government clients focused on water, environment, infrastructure, resource management, energy, and international development. With 16,000 associates worldwide, Tetra Tech provides clear solutions to complex problems. For more information about Tetra Tech, please visit tetratech.com, follow us on Twitter (@TetraTech), or like us on 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 10-Q filings with the Securities and Exchange Commission.