Carollo Engineers is an environmental engineering firm specializing in the planning, design, and construction of water and wastewater facilities. The firm was founded in Phoenix, AZ in 1933. The firm is now headquartered in Walnut Creek, CA. To better service our clients, we currently maintain 32 offices in 12 states.

Cities, utilities and special districts of all sizes have counted on Carollo to help them navigate through the increasingly complex challenges of cost-effectively and sustainably protecting public health, meeting local, state and federal regulatory requirements, protecting the water environment, and addressing public expectations.

Our staff includes civil, structural, electrical, mechanical, environmental, and instrumentation and control engineers as well as scientists, planners, architects and CAD designers. All have training and expertise specific to water-related engineering. Our teams work collaboratively with our clients to find the best ways to protect and enhance our public water supplies and our lakes, streams, rivers and oceans.

Water sustains life on this planet and clean, safe water sustains healthy ecosystems and healthy communities. Carollo employees are proud of our role in making the communities that we live in, work in, and serve, better places to live.