Tetra Tech Inc provides consulting and engineering services for environmental, infrastructure, resource management, energy, and international development markets. It specializes in providing water-related services for public and private clients. The company's solutions may span the entire life cycle of projects, from planning and forecasting to execution and maintenance. It designs infrastructure, facilities, and other structures with complex plans and resource management. Tetra Tech has three operating segments: water, environment and infrastructure); resource management and energy); and remediation and construction management). Most of the company's revenue comes from the United States.