The Washington Aqueduct can add copper sulfate to its treatment process to fight algae issues in the Potomac River, protecting the D.C. area’s main water source.

Since the 1850s, it has helped provide safe drinking water to the District. Now, the Washington Aqueduct is undergoing a $21 million repair.

The Washington Aqueduct is sourced from the Potomac River and serves as the public water supply for the D.C. area, Arlington County and other portions of Northern Virginia.

"Under advice from the Washington Aqueduct, DC Water issued the precautionary boil water advisory as a conservative measure to protect public health, and we sincerely appreciate our customers ...

The Army Corps. of Engineers saw increased cloudiness – called turbidity in technical terms – in water taken from the Washington Aqueduct, which services the District and Arlington County.

The Washington Aqueduct produces an average of 135 million gallons of water per day, supplying drinking water to roughly 1 million people in D.C., Arlington County and other parts of northern ...

Algae blooms in the Potomac River prompted a boil-water advisory for nearly a million residents in Washington and Arlington County. The advisory was lifted on Thursday morning.

A boil water advisory was issued Wednesday night for the entire District of Columbia and Arlington County. The Pentagon, Arlington National Cemetery and Reagan National Airport are also affected.

Precautionary boil water advisories for Washington, DC, and Arlington County were lifted Thursday morning, after local authorities announced water quality never deviated from safety standards.