Tetra Tech, Inc. (NASDAQ: TTEK) announced today it has been awarded a five-year, $23 million single-award contract with the U.S. Environmental Protection Agency (EPA) to assess and reduce the human health and ecological risk from contaminated fish, sediments, and water-borne pathogens in fresh and marine waters. Through a combination of field work, laboratory analysis, modeling, and data interpretation, Tetra Tech will support the Standards and Health Protection Division within EPA’s Office of Water to develop strategies that will address both the prevention and impacts of specific pollutants in our waters. The presence of contaminants, such as water-borne microbes, and toxins from various sources threaten drinking water supplies, recreational waters, and many aquatic plants and animals. “Tetra Tech is pleased to provide continued support to EPA’s Standards and Health Protection Division in developing innovative solutions to some of today’s most complex water quality issues,” said Dan Batrack, Tetra Tech Chairman and CEO. About Tetra Tech ( www.tetratech.com) Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services. The Company supports government and commercial clients by providing innovative solutions to complex problems focused on water, environment, energy, infrastructure, and natural resources. With 14,000 employees worldwide, Tetra Tech’s capabilities span the entire project life cycle. 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.