Carollo Engineers is an environmental engineering firm specializing in the planning, design, and construction of water and wastewater facilities. Carollo’s reputation is based upon client service and a continual commitment to quality. We currently maintain 28 offices in 12 states.

During our 75-year history, Carollo has successfully completed more than 15,000 projects for public sector clients. Carollo is currently ranked within Engineering News Record’s (ENR) top 100 design firms. More importantly, ENR’s annual Source Book ranks Carollo among the top firms for water and wastewater treatment plant design. Unlike our competitors, Carollo only provides water and wastewater engineering services. We recruit nationwide and hire technical staff who have extensive background and training specific to this field. For that reason, the quality and professional standing of our core group of water and wastewater professionals equals or exceeds that provided by some of the largest engineering firms in the country.

We have recently completed or are performing ongoing water/wastewater projects for many of the country’s major municipalities or special districts.