Severn Trent Environmental Services, 3333 S Old Price Rd, Chandler, AZ 85248, US

For more than 75 years, Carollo Engineers has successfully completed more than 15,000 projects for public sector clients. The Engineering News Record has rated the firm as a top 100 design firm. It is an environmental engineering firm that specializes in the planning, design and construction of water and wastewater facilities. The company has a presence in more than 10 states with nearly 20 offices throughout the country. Carollo employs more than 700 people that include more than 300 registered engineers. The engineers have experience a number of industries, such as civil, sanitary, environmental, electrical, mechanical, chemical, structural, control systems and corrosion control. The firm provides a variety of services, such as water, wastewater, energy, air quality, storm water, water reuse construction management, groundwater, design/build, integrated water resources and associated services. Carollo Engineers has a location in Walnut Creek, Calif.