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Virginia environmental officials say the Potomac River is safe for contact after at least 243 million gallons of raw sewage poured into it, though swimming is still not recommended and scientists are investigating possible long-term effects.
The spill began after the Potomac Interceptor ruptured Jan. 19 near the I-495 and Clara Barton Parkway interchange. Michael Rolband, director of the Virginia Department of Environmental Quality, described the event as a “temporary insult” during a March 19 meeting at Alexandria’s Lee Center.
Rolband said testing found E. coli levels significantly below federal thresholds for unsafe swimming. He also said the sewage became more diluted as it traveled downstream and that testing showed no significant effects on fisheries or recreational activities.
Still, he urged anyone handling fish from the Potomac to wash their hands and cook the catch before eating it.
Rolband noted that the Potomac is an urban river affected by pet waste and other pollution. Untreated sewage also enters regional waterways during heavy rainfall through combined sewer overflows.
Alexandria and the District of Columbia are working on infrastructure projects intended to reduce those discharges. Alexandria’s project is expected to finish this summer, while the District’s work is scheduled for completion by 2030.
Massive Cleanup Followed the Rupture
The 54-mile interceptor normally carries about 60 million gallons of sewage each day from Dulles Airport to the Blue Plains treatment plant in Southeast Washington. The system serves approximately 500,000 people.
DC Water Chief Operating Officer Matthew Brown said the response prevented another 2 billion gallons from overflowing. Crews removed 2,341 tons of debris—roughly the weight of 1,300 cars—including enough rags and wipes to fill a swimming pool.
Flow through the interceptor resumed March 14, and most recreational advisories have since been lifted.
DEQ continues its regular sampling at Northern Virginia locations including Hunting Creek, Little Hunting Creek, Dogue Creek, Pohick Creek and the Occoquan River.
Fishing guide Rob Snowhite said he initially feared the spill could ruin the entire year. He now believes the river is ready for the spring season and said strong sales of shad flies through his Etsy store suggest local anglers remain interested.
Scientists Track Possible Lasting Effects
Researchers are still examining whether the spill could contribute to future algae blooms, polluted sediment or other long-term changes.
George Mason University scientists are working with the Potomac Riverkeeper, the Interstate Commission on the Potomac River Basin and the Potomac River Fisheries Commission to study the aftermath.
Dr. Cindy Smith of George Mason’s Potomac Environmental Research and Education Center said researchers are documenting changes in water conditions, aquatic life and the river’s food web in real time.
From the Woodrow Wilson Bridge south to Piney Point, teams are measuring turbidity, fecal coliforms, cyanobacteria, cyanotoxins, phytoplankton, fish diversity and heavy metals. Other researchers are studying areas upstream, and George Mason’s data collection could continue for several years.
Restoration Plan Draws Criticism
DC Water remediation manager Amanda Zander said March 19 that the agency plans to remove debris and other material down to the clay layer, restore topsoil, and plant vegetation and trees.
Potomac Riverkeeper Network President Betsy Nicholas criticized the proposal at a March 11 gathering in Alexandria, calling it “disappointing.” She said there had been no public engagement and argued that the plan focused too narrowly on the immediate rupture site instead of addressing long-term damage.
In a March 27 report, the Riverkeepers described the proposal as insufficient to restore affected communities and the Potomac’s health.
Aging Pipe Becomes a Broader Warning
Rolband attributed the collapse to the interceptor’s age, calling deteriorating infrastructure a collective societal problem.
The federal government built the pipe in the 1960s. The American Society of Civil Engineers gave U.S. wastewater infrastructure a D+ and stormwater infrastructure a D in its 2025 report card.
Nicholas called the rupture a wake-up call about infrastructure problems that have gone unaddressed for too long.
A group of Washington-area members of Congress led by Virginia Rep. Don Beyer is seeking federal funding to modernize the interceptor and other aging water systems across the region.
DC Water chief David Gadis said at the close of the March 19 meeting that the previous 57 days had been extremely difficult and that the agency was doing everything it could to prevent another failure.
Alexandria Mayor Alyia Gaskins opened the meeting by expressing hope that residents would get answers. Despite the return of sewage flow and encouraging water tests, many questions about the river’s long-term recovery remain unresolved.