Tetra Tech, Inc. is a U.S.-based multinational company providing engineering and consulting services, headquartered in Pasadena, California. Founded in 1966, it specializes in engineering, environmental, water resources, energy, and renewable solutions. Tetra Tech offers services in design, consulting, research, and technical services to both the public and private sectors. Its main areas of focus include water resource management, environmental consulting, sustainable infrastructure projects, and climate change response. The company operates globally, with its services covering more than 100 countries around the world.