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A collapse in the Potomac Interceptor sewer line sent over 200 million gallons of waste water into the Potomac River, prompting recreation advisories while officials said the region’s drinking water remained safe.
According to DC Water, a section of the 54‑mile Potomac Interceptor sewer line collapsed on January 19 along Clara Barton Parkway in Montgomery County, causing a major overflow into the C&O Canal National Historical Park. The line normally carries about 60 million gallons of wastewater each day from areas including Dulles Airport to D.C.’s Blue Plains treatment plant.
DC Water said crews quickly moved to build a bypass, which went into service on January 24, using pumps and the C&O Canal to divert flow around the damaged segment.
Is the Potomac River Drinking Water Safe?
“It’s important to note, DC Water’s drinking water system is separate from the wastewater system, and we want to reassure the public the drinking water is safe, and water service is NOT affected by this incident,” DC Water said.
“The overflow is downstream from the Washington Aqueduct’s (Aqueduct) intakes at Great Falls. In coordination with the Aqueduct, the intakes are also closed at Little Falls downstream.”
A spokesperson for the agency reiterated to Newsweek on Tuesday that drinking water is not, nor ever was, impacted by the incident, and that the water and sewer systems are separate.
“We have been coordinating with U.S. EPA [Environmental Protection Agency] since the Potomac Interceptor collapsed and appreciate the ongoing support and counsel they have provided. Just last week, we hosted the Assistant Administrator for Water for a tour of the site and briefing on the project and the progress made to date. Our operations team set up a bypass to reroute wastewater around the broken section and limit overflows to the Potomac River,” the spokesperson said.
“Additional pumps have been installed this week to allow for the excavation of the damaged section to remove a rock dam and allow us to make emergency repairs to the pipe. While repairs are on track for completion within 4–6 weeks, this incident underscores the urgent challenge of aging infrastructure. Continued regional and federal partnership can help restore and strengthen one of the most critical water assets in the region.
“DC Water stands ready to work together to protect our shared national treasure, the Potomac River,” they added.
The Virginia Department of Health (VDH) said that Fairfax is the closest Virginia community that draws its main water supply from the Potomac River. Its intake point sits several miles upstream from where the spill entered the river, placing it outside the affected area.
Potomac River Sewage Spillage Mapped
DC Water released a map showing the spill site and the six locations where E. coli sampling has been underway. The agency said crews are concentrating on clearing debris from the broken pipe so repair work can begin. It also noted that cleanup and remediation planning is in its early stages, with efforts expected to focus on affected areas such as the canals and the Potomac River. Those measures will be developed in coordination with federal, state, and local partners, it said.
The VDH has issued a recreational water advisory for the river “out of an abundance of caution” due to the spill and a subsequent discharge report on February 7—the area which extends 72.5 miles from the American Legion Memorial Bridge (I-495) in Fairfax County to the Governor Harry W. Nice Memorial Bridge (Route 301) in King George County, it said.
“VDH has observed no evidence of impacts to drinking water at this time,” read a February 13 press release from the agency.

What People Are Saying
DC Water CEO David L. Gadis said in an open letter: “We recognize that describing response actions and infrastructure details does not erase the environmental impact or the concern this incident caused. For those who live near the river, recreate on it, or work every day to protect it, witnessing this unfold was distressing. We hear that clearly.
“This incident has also underscored a broader reality facing utilities across the country: much of the infrastructure that protects our waterways was built decades ago, long before today’s environmental standards, population growth, and climate pressures. The Potomac Interceptor – more than 60 years old – is a critical regional asset, conveying wastewater from across the metropolitan area to the Blue Plains Advanced Wastewater Treatment Plant. Its failure reinforces why sustained investment and vigilance are essential.”
President Donald Trump wrote on Truth Social on Monday: “There is a massive Ecological Disaster unfolding in the Potomac River.”
An EPA spokesperson told The Hill: “DC Water is responsible for responding to the Potomac Interceptor collapse, and there is currently no impact to drinking water systems. EPA inspectors are visiting the site every week to perform compliance monitoring, and EPA will continue to coordinate with DC Water to ensure their efforts are sufficient.”
What Happens Next
DC Water said Monday that its crews and contractors were “nearing completion of an enhanced bypass system that will allow emergency repairs to begin on a damaged section of the Potomac Interceptor.”
“The emergency repair is expected to take another 4-6 weeks once the enhanced bypass system is activated ,” it said.
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