A massive sewer pipe ruptured late Monday in Maryland, sending an estimated 40 million gallons of sewage daily into the Potomac River upstream from Washington, D.C., as crews scrambled to contain the overflow ahead of a major winter storm. DC Water, which operates the region’s sewer system, is installing pumps to divert the flow around the break while repair work proceeds.

The spill highlights the chronic underfunding of American water infrastructure, with aging pipes across the nation reaching the end of their service lives faster than they can be replaced. The District alone needs $1.33 billion to rehabilitate its sewer system over the next 20 years, while hundreds of billions in investment is required nationally to address similar aging-pipe failures.

The Rupture

A 72-inch sewer pipe ruptured late Monday in Maryland, sending an estimated 40 million gallons of sewage daily into the Potomac River upstream from Washington, D.C. The break occurred in Montgomery County, Maryland, along Clara Barton Parkway near Chesapeake and Ohio Canal National Historic Park.

DC Water, which operates the region’s sewer system, said the broken pipeline — the Potomac Interceptor, installed in the 1960s — will require crews to divert sewage around the rupture. The utility is installing pumps to channel the flow into the C&O Canal and back into the sewer system downstream. Repairs are expected to take through the weekend, though a major winter storm forecast for early this week could complicate the work.

The Scene

Warning signs posted near the river read “DANGER” and “Raw Sewage,” alerting the public to stay away from the affected area.

“Oh, my god, the smell is horrific,” said Dean Naujoks, the Potomac Riverkeeper and an environmental nonprofit advocate. “It’s such high concentrations of sewage that just grabbing a sample is a public health risk.”

Naujoks described the spill as a visible cascade. “Sewage is just bubbling up like a small geyser, maybe 2, 3 feet into the air. Sewage water is running in every direction.” He and colleagues donned protective gloves to sample the river’s water for E. coli and other bacteria.

Known Deterioration

DC Water acknowledged that the Potomac Interceptor was deteriorating prior to the break. The utility began rehabilitation work on a section about a quarter-mile from the rupture in September 2025 and completed that work recently. Additional repair work on “high priority” sections is scheduled to start later in 2026, according to DC Water.

The utility cautioned the public to stay away from the affected area and to wash their skin if exposed to the water.

The Broader Picture

This rupture reflects a chronic underfunding crisis in American water infrastructure. Gary Belan, a senior director with American Rivers, said such failures are becoming routine.

“I know a lot of the wastewater folks are trying to catch up as best they can, but this is something we see and will continue to see, where these pipes fail and these massive sewage dumps occur,” Belan said. “This is why we can’t defer maintenance of our wastewater infrastructure. Too often, we’re dependent on these disasters to prod us forward.”

DC Water operates under EPA oversight established through a 2015 federal consent decree. The agency said it was coordinating with DC Water and state officials to assess the environmental impact. The EPA’s 2022 estimate found that the District needs approximately $1.33 billion to replace or rehabilitate deteriorating sewers within the next 20 years.

Nationally, the scope is vastly larger. Hundreds of billions in infrastructure investment is needed over the next two decades to address aging water-system failures like the Potomac Interceptor rupture.

The pumps being installed have capacity to handle all the sewage flow during dry weather, but DC Water warned that a surge in stormwater from the approaching winter storm could overwhelm them. Forecasters predict significant snow and rain through the region this week.