Potomac River Sewage Spill Lawsuit Investigation

Attorneys working with ClassAction.org believe that DC Water failed to adequately prevent or remediate a pipe collapse in their Potomac Interceptor wastewater pipeline that dumped over 200 million gallons of raw sewage into the Potomac River, contaminating the water and affecting many local businesses and properties.

Potomac Interceptor Wastewater Pipe Collapse: What Happened?

On January 19, 2026, a 72-inch diameter section of the Potomac Interceptor (PI) wastewater pipe collapsed, causing hundreds of millions of gallons of raw, untreated sewage to spill into the Potomac River. The collapsed segment of pipe is located in Montgomery County, Maryland along the Clara Barton Parkway at the I-495 interchange and the C&O Canal National Historical Park.

DC Water estimated that about 194 million gallons overflowed from the collapse site into the Potomac within the first five days after the collapse. On January 24, 2026, the company installed a temporary bypass pump system on the pipe, which reduced the amount of wastewater entering the river, but did not completely stanch the overflow.

By February 6, 2026, DC Water estimated that, including the spillage from the first five days, a total of 243 million gallons of untreated wastewater had entered the Potomac from the collapsed section of the PI.

While rehabilitation and repair of the pipe began on March 3, 2026 with an expected timeline of nine to ten months, some lawyers believe that DC Water may have acted negligently regarding the damage to the pipe that they were reportedly aware of for over 10 years before the collapse.

DC Water Negligent with Pre-Existing Pipe Damage, Lawyers Say

Between 2011 and 2015, DC Water conducted a comprehensive inspection of the Potomac Interceptor and reported that “the majority of the pipe segments show signs of corrosion, and some show settled deposits.” While the company did announce a 10-year, $625 million rehabilitation and repair plan following the conclusion of this inspection in late 2015, they allegedly continued to operate the damaged segments of the pipe without any additional monitoring or interim reinforcement, and without establishing pre-staged emergency and failure-response measures.

Because of this, attorneys argue that DC Water operated negligently and directly contributed to the damage caused by the pipe segment collapse in January 2026.

Contamination and Damage to Riverside Property

Following the sewage spill, public health advisories were issued by D.C., Maryland and Virginia to avoid contact with the Potomac and its shorelines in the affected area, as well as to avoid catching or eating fish or shellfish due to unsafe levels of E. coli bacteria in the water.

While recreation advisories were slowly pulled back, and the shellfish harvesting closure was lifted on March 10, 2026, businesses and properties along the riverfront may still have been severely affected by the contamination.

River recreation and shellfish businesses in the polluted zone were forced to close for well over a month due to health risks, and both they and businesses miles downstream of the collapse have suffered severely reduced business even after the closures and advisories were lifted due to lingering doubts about the polluted water’s safety.

Robert T. Brown, the head of the Maryland Watermen’s Association, told WTOP News that the Potomac Interceptor collapse “has devastated our market,” stating that “[t]he people who shuck the oysters and stuff and ship them don’t want no oysters coming out of the Potomac because they [are] afraid of what it may be,” even when the oysters are being harvested dozens or even a hundred miles downstream of the collapsed pipe.

“Once you put it in a person’s head that something may not be safe to eat, it’s hard to overcome that,” Brown said.

Personal property along the river was also harmed by the Potomac River sewage spill, including contamination of personal boats and other vessels, as well as potentially diminished property value of nearby buildings.

How Could a D.C. Water Lawsuit Help?

If filed and successful, a class action lawsuit could help to compensate those affected by the spill for contamination or damage to their property on the Potomac River, out-of-pocket cleaning and repair costs, and losses from interruptions to business due to the spill.

After you get in touch, an attorney or legal representative may directly reach out to ask you some questions and explain how you may be able to help. It costs nothing to fill out the form or speak with someone, and you’re not obligated to take legal action if you don’t want to.

Before commenting, please review our comment policy.