Organization Type: Consultant Carollo is a full-service, environmental engineering firm that has been exclusively providing water, wastewater, and stormwater services for 90 years to municipal, federal, and private sector clients. We remain responsive to the needs of our clients as the industry leader in the planning, permitting, design, construction, and operations of facilities that reliably convey and treat water across the US. Water Supply: N/A Population Served: N/A Water Users: N/A Total Storage Volume: N/A Key Issues/Challenges: Various