07/28/2026
Today—July 28, 2026—is Tetra Tech’s official 60th anniversary!
On July 28, 1966, Tetra Tech’s founders submitted incorporation papers for a small business focused on coastal engineering, research and development, geophysics, and systems analysis. As the company has evolved, we have continued to build on our roots by Leading with Science® and leveraging the most advanced technology of each era to solve our clients’ and communities’ most complex challenges.
Over the past 60 years, Tetra Tech has grown to be a global leader in water, environment, and sustainable infrastructure. Today, our more than 25,000 employees work on 110,000 projects each year across 125 countries on 7 continents.
To our employees—whether you have been with Tetra Tech for decades, years, or a few months—thank you for your expertise, entrepreneurial spirit, and dedication that continue our founders’ commitment to helping clients solve critical challenges.
To our clients, partners, and communities: Thank you for your trust and partnership over the past 60 years. We look forward to continuing to work with you to solve complex problems, develop new solutions, and build on our long-standing partnerships.
Explore Tetra Tech’s history using the hashtag and see our employees working on projects worldwide at .