The Potomac River Tunnel is part of a court-mandated effort to curb combined sewer overflows (CSOs), a major source of pollution in the District’s waterways. CSOs occur when heavy rain ...

WASHINGTON — A major new phase of DC Water’s long-running Clean Rivers Project is officially underway. District leaders gathered at West Potomac Park on Monday to mark the start of ...

According to the Potomac Conservancy Report Card, the primary source of pollution in the Potomac River is urban runoff, which is one of the leading causes of pollution in the United States.

The cleanup event aims to improve water quality and protect wildlife habitats in the Potomac River, which supplies drinking water to over five million people. Despite recent improvements ...

This $615 million project is key to cleaning up the Potomac River. When heavy rain strikes a centuries-old neighborhood in Alexandria, Va., the city’s pipes can’t handle the volume.

including the Potomac in Washington, smelled of raw sewage and contained toxic chemicals. Ohio's Cuyahoga River was so contaminated, its oil slicks erupted in flames. That unchecked pollution didn ...