Potomac River Guide Home

Interactive Maps

The Lower Potomac

The Potomac Estuary

Mount Vernon to Reagan Airport

Mall Area

Georgetown to Great Falls

Potomac Piedmont

Upper Potomac

The North Branch

Boat Ramps

Monitoring Sites

Bridges and Ferries

Cruises and Charters

Search Potomac Sites

Dalecarlia Treatment Plant

U.S. Army Site

One of the more "recent" additions to the Washington Aqueduct, this treatment plant was built to accommodate the increasing population of the city in the 1920s. A rapid-sand filter plant was completed in 1926; since then, additional filtering and chemical treatment facilities have been added. Numerous large diameter pipelines send purified water to the District and across the Potomac to consumers in Virginia.

In 1993, a serious warning was issued for bacterial contamination of drinking water in the District and Virginia. The Army Corps of Engineers spent more than $75 million on maintenance, including dredging the Dalecarlia reservoir, replacing filter beds, and installing automatic chemical feeders.

Click here for larger map and nearby sites.

Contact Information
U.S. Army Corps of Engineers
5900 MacArthur Blvd., N.W.
Washington DC 20016

Website