From February 20 through May 15, 2023, Washington Aqueduct will temporarily switch disinfectant in drinking water from chloramine to chlorine to aid in cleaning water distribution systems and improve water quality. During this time, you may notice a slight change in the taste and smell of your drinking water. Read more.

Washington Aqueduct's statement on EPA’s proposed PFAS regulations

March 16, 2023: Washington Aqueduct is dedicated to executing its critical mission to ensure safe, reliable, and cost-effective drinking water for its customers, which includes a strong commitment to meeting upcoming U.S. Environmental Protection Agency (EPA) regulatory standards for per- and polyfluoroalkyl substances (PFAS).  Our team is evaluating the EPA’s Proposed PFAS National Primary Drinking Water Regulation announced on March 14, 2023, and in tandem with our wholesale customers, is preparing to meet all EPA requirements once drinking water standards are finalized.

Please contact your respective direct water provider for additional information.

DC Water

Arlington County

Fairfax Water


Washington Aqueduct Overview

The Washington Aqueduct produces drinking water for approximately one million citizens living, working, or visiting in the District of Columbia, Arlington County, Virginia, and other areas in northern Virginia to include portions of Fairfax County. 

A division of the Baltimore District, U.S. Army Corps of Engineers, the Aqueduct is a federally owned and operated public water supply agency that produces an average of 135 million gallons of water per day at two treatment plants located in the District of Columbia. All funding for operations, maintenance, and capital improvements comes from revenue generated by selling drinking water to the three jurisdictions.

The Corps of Engineers designed, built, and, in 1859, began operating the Aqueduct. Since then, the Corps has substantially expanded and improved the capacity and function of the Aqueduct from its original mission of supplying raw river water to a sparsely populated District of Columbia to today’s mission of providing safe drinking water to a much larger and more populous service area.

Our Mission

The mission of the Washington Aqueduct is to collect, purify, and pump an adequate supply of drinking water for its wholesale customers: DC Water, Arlington County, and Fairfax Water. 

Our Vision

Washington Aqueduct's vision is to be a leader in the water treatment and supply industry employing state of the art technology, highly-skilled and trained personnel, creative solutions and modern processes.

USACE's How it Works E1 - Washington Aqueduct

Contact Information

5900 MacArthur Boulevard
Washington, D.C. 20016-2514