District of Columbia

Click on image to see water supply system diagram

*Note that diagram is simply a schematic representation of the major components of the water supply system. It is not drawn to scale, and symbols do not represent actual volumes or geographic orientation.

Your Water Supply

• Water Source

The District of Columbia gets its water from the District of Columbia Water and Sewer Authority (DC WASA), a water distribution agency, which purchases water from the Washington Aqueduct Division of the U.S. Army Corps of Engineers (WAD).
WAD gets its water from the Potomac River through intakes at Great Falls and Little Falls.


• Water Treatment

WAD has two water treatment plants, the McMillan and Dalecarlia plants.


• Water Quality

Read the Consumer Confidence Report on DC WASA's website or call the Water Quality Division at 202-612-3440 to obtain a copy.


• Contact Information

Address: District of Columbia Water and Sewer Authority, Department of Water Services, Water Quality Division, 301 Bryant Street, Washington DC 20001
Phone: 202-612-3440
Fax: 202-673-4452

Link to DC WASA's website:http://www.dcwasa.com