About Us

Carollo Engineers is an environmental engineering firm that specializes in the planning, design, and construction of water and wastewater facilities. Carollo was founded in Phoenix, Arizona, in 1933 and counts the City of Phoenix among one of our original clients—a working relationship that is 86 years old! From that single office with three engineers, Carollo has grown to more than 1000 people in 45 offices throughout the United States. Carollo recognizes that water sustains life on this planet and clean, safe water sustains healthy ecosystems and healthy communities. Our employees are proud of our role in making the communities that we live in, work in, and serve, better places to live. We continually strive to emulate our mission statement of being: ''The BEST water consulting firm in the United States.''