Water System Overview
Drinking water in the District of Columbia is drawn from the Potomac River at Great Falls and Little Falls by the U.S. Army Corps of Engineers Washington Aqueduct and is treated at two water treatment plants, Dalecarlia and McMillan.
Diagram of Water System
The District of Columbia Water and Sewer Authority (DC Water) purchases the treated water and distributes it to homes and businesses through a 1,300-mile network of transmission lines, pump stations, water mains, storage tanks and fire hydrants.