Potomac Sewage Spill Raises Drinking Water Concerns

Over 200 million gallons of wastewater spilled into the Potomac River after a sewer line collapse in Montgomery County.

Published on Feb. 18, 2026

Got story updates? Submit your updates here. ›

A major sewage spill occurred in the Potomac River after a section of the Potomac Interceptor sewer line collapsed on January 19, causing over 200 million gallons of wastewater to overflow into the C&O Canal National Historical Park. While officials have assured the public that drinking water remains safe, the incident has raised concerns about the aging infrastructure and the environmental impact on the river.

Why it matters

The Potomac River is a critical water source for the region, providing drinking water to millions of people. The sewage spill has prompted recreational advisories and raised questions about the vulnerability of the region's water infrastructure and the potential long-term effects on the river's ecosystem.

The details

The collapse occurred along the Clara Barton Parkway in Montgomery County, causing a major overflow into the C&O Canal. DC Water quickly set up a bypass system to divert the flow around the damaged section, but the incident has highlighted the broader challenge of aging infrastructure in the region.

  • The Potomac Interceptor sewer line collapsed on January 19, 2026.
  • DC Water's bypass system went into service on January 24, 2026.
  • The emergency repairs are expected to take 4-6 weeks to complete.

The players

DC Water

The water and sewer utility serving the Washington, D.C. metropolitan area, responsible for responding to the Potomac Interceptor collapse and ensuring the safety of the region's drinking water.

Virginia Department of Health (VDH)

The state agency that has issued a recreational water advisory for the Potomac River due to the sewage spill, while also stating that there is no evidence of impacts to drinking water.

U.S. Environmental Protection Agency (EPA)

The federal agency that has been coordinating with DC Water and providing support and counsel since the Potomac Interceptor collapse.

Got photos? Submit your photos here. ›

What they’re saying

“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.”

— DC Water Spokesperson (Newsweek)

“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.”

— David L. Gadis, DC Water CEO (Newsweek)

“There is a massive Ecological Disaster unfolding in the Potomac River.”

— Donald Trump (Truth Social)

What’s next

DC Water is nearing completion of an enhanced bypass system that will allow emergency repairs to begin on the damaged section of the Potomac Interceptor, which is expected to take another 4-6 weeks.

The takeaway

This incident highlights the urgent need for sustained investment and vigilance in maintaining the region's aging water infrastructure, which is critical for protecting the Potomac River and ensuring the safety of the drinking water supply for millions of people.