Castro Collaborative Consulting, 6554 N Muscatel Ave, San Gabriel, CA 91775, US

Tetra Tech is one of the leading providers of specialized management consulting and technical services. The company focuses on the areas of resource management, infrastructure, and communications. Tetra Tech was founded to provide engineering services related to waterways, harbors and coastal areas. The company has since increased the size and scope of its business and expanded its service offerings through a series of strategic acquisitions and internal growth. Tetra Tech provides environmental services, water and wastewater management, infrastructure services, security design and outsourced technical services. The company had nearly 7,500 employees located in more than 250 offices throughout the world. Tetra Tech was founded in 1966 and is based in Pasadena, Calif.