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About Us

Two people in aprons sitting in a green field, one wearing gloves and looking at a test tube and the other entering information on a tablet

Leading with Science® to solve the world’s most complex problems

Tetra Tech is a leading, global provider of high-end consulting and engineering services. We are 28,000 employees dedicated to solving water, environment, sustainable infrastructure, renewable energy, and international development challenges for our clients and communities.

We use our Leading with Science® approach and leverage our Tetra Tech Delta technologies to create sustainable solutions for 100,000 projects in more than 100 countries on 7 continents each year.











Who we are

Tetra Tech has been Leading with Science® to address our clients’ most complex challenges since 1966.

Our approach

Safety and sustainability are at the heart of our business. We improve the quality of life for people across the globe.

What we do

Learn how we solve our clients’ problems with practical, innovative, sustainable solutions.

Where we work

With 550 offices worldwide, we combine local understanding with the resources and expertise for the most demanding projects.

Engineering News-Record #1 Rankings


in Water Treatment/Desalination


in Environmental Management


in Wind Power


in Hydro Plants


  • 2024: Climate Change Business Journal (CCBJ) and Environmental Business Journal (EBJ) awards for outstanding business and advancing climate resilience, innovation, and diversity and inclusion. Read more.
  • 2024: Barron’s 100 Most Sustainable U.S. Companies – advanced to #8 from #24.
  • 2023: Investor’s Business Daily 2023 Best ESG Companies special report #1 ranking for Human Capital and #2 ranking for Environment.
  • 2023: CCBJ and EBJ awards for outstanding business and achievement in renewable energy, forest conservation, ocean monitoring, and dam safety. Read more.
  • 2023: Tetra Tech is honored to be selected for the 2023 Society of American Military Engineers JW Morris Large Business Award.
  • 2022: U.S. Small Business Administration Dwight D. Eisenhower Award, Excellence in Service Category. Read more.
  • 2021: Society of American Military Engineers Large Business Award for achievement in small business mentorship. Read more.
  • 2021: Newsweek’s list of America’s Most Responsible Companies 2021: Top 10 companies in the Professional Services category. Read more.
Complex World, Clear Solutions
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