The Potomac River Basin or watershed covers 14,670 square miles through five geological provinces. The river flows over 400 miles spanning Washington, D. C. and four states -- Virginia, Maryland ...

WASHINGTON – While area drinking water sourced from the Potomac River is safe for consumption, it is not treated for the known chemicals and pharmaceuticals contaminating the river ...

If the Potomac River has gotten more attention than the Anacostia in the past 50 years, it’s partly because the Potomac supplies 90 percent of the region’s drinking water. That amounts to an ...

A chute of the Potomac River near Great Falls. The Potomac River is the source of drinking water for more than 6 million people in the metropolitan area.

The Potomac River watershed is truly the lifeblood of our region. It covers more than 14,000 square miles across four states. The watershed provides drinking water for more than six million people.

The Potomac River is healthier than it’s been in decades, according to an annual state-of-the-river report that notes steady improvements across a range of environmental indicators, from water ...

The Potomac River provides much of the District's drinking water, but is falling into worsening condition owing to rural farming and urban development, an environmental group said Thursday.

The waters of the Potomac River, especially in the stretch where they form in the mountains and flow past Washington, are getting cleaner. But a new report says there’s still more work to do to ...

A second species of invasive water chestnut, Trapa bispinosa, covers the surface of a lake in Fairfax County, VA. (Photo courtesy of Nancy Rybicki) It springs to life each year in freshwater ponds ...

Officials said a Water Rescue Team was on the Potomac River near Angler Boat Ramp around 11:40 a.m. in response to a man having a medical emergency. Crews said the man was seen floating in the water.