Washington Aqueduct: Serving Our Nation's Capital for Over 150 Years

The Corps' Washington Aqueduct has owned and operated raw water conveyance and treatment systems for Washington, DC, for more than 150 years. The Washington Aqueduct has a fascinating history and features architecturally stunning infrastructure, three components of which have received AWWA's American Water Landmark Award. The Washington Aqueduct is a wholesale water utility providing drinking water to more than one million people in the national capital region. It owns and operates the Dalecarlia and McMillan Water Treatment Plants. Water flows from the Potomac River to the Dalecarlia Reservoir and from there to either the Dalecarlia plant or the McMillan plant via the Georgetown Reservoir, City Tunnel, and McMillan Reservoir.