Massive Potomac River Spill: A Month Later, Is the Water Safe?

ANNAPOLIS, Md. — How do you fix what is being called the largest sewage spill in the region’s history? That was the multi-million-dollar question facing Maryland lawmakers on Friday as they convened a virtual briefing to investigate the catastrophic failure of a 60-year-old sewage pipe in Cabin John.

It has been nearly a month since the 72-inch Potomac Interceptor pipe burst on January 19, spewing an estimated 243 million gallons of raw wastewater into the Potomac River. While DC Water crews race to complete repairs, the political and environmental fallout is only beginning to surface.

The “outrage” over the spill has followed the millions of gallons of sewage downstream. On the Alexandria waterfront, residents expressed horror at the scale of the contamination.

“I hate it. It’s horrible,” said resident Barry Kessel. “The bad stuff seeps into the water and comes our way, ends up in the Chesapeake Bay and then the ocean.”

The concern is backed by data. The spill has not affected drinking water, but it’s causing massive environmental concerns. Researchers from the University of Maryland (UMD) testified that toxic bacteria have been detected nearly nine miles south of the initial rupture, reaching both Alexandria and National Harbor. Beyond standard E. coli, testing has identified Staph aureus and the antibiotic-resistant superbug MRSA in the water.

“I’ve seen it characterized as one of the worst ecological disasters in the eastern part of the United States,” said Delegate Linda Foley (D-Montgomery County) during the House Environment and Transportation Subcommittee hearing.

During the hearing, Maryland lawmakers pressed DC Water leadership for a definitive timeline on when the leak would be fully sealed and the pipe repaired.

Matt Brown, DC Water’s Chief Financial Officer, stated that the utility has not seen an overflow into the river since Sunday, noting that they have onsite capacity to capture minor “residual” leaks. However, the discovery of a 30-foot boulder inside the collapsed pipe has complicated the engineering.

“This one, we think it’s going to take four to six weeks,” said Moussa Wone, DC Water’s Senior Vice President of Strategy and Performance. “We’re making very good progress there, but we think we’re going to be on schedule or beat that schedule.”

While the Maryland Department of the Environment (MDE) reported that bacteria levels are beginning to trend downward, officials emphasized that the water is not yet safe. Residents are still being warned to avoid all contact with the river and to keep pets away from the shoreline.

Lee Currey, MDE’s Director of Water Services, committed to weekly testing to ensure the state has its own independent data. But for Potomac Riverkeeper Dean Naujoks, testing must continue into the future.

“I think we need to do daily monitoring,” Naujoks testified. “If we’re going to restore the public’s faith and confidence in using the river again, that needs to continue.”

Curiously, one major partner was missing from the table. Delegate Foley noted that the Environmental Protection Agency (EPA) was invited to testify but declined to attend.

“We did invite the EPA to join us on this call,” Foley said. “They responded that they didn’t think they had anything to offer and refused to join us.”

For now, the Potomac remains under a public health advisory, and the long-term impact on the region’s fisheries — including the 3-million-pound annual Blue Catfish industry — remains unknown.