Tetra Tech provides consulting and engineering services that focuses on water, environment, infrastructure, energy, and international development. Co.'s segments are: Government Services Group, which supports U.S. government civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology, and disaster management; and Commercial/International Services Group, which provides infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), the U.K., as well as Brazil and Chile.