A failure in a sewer pipe about eight miles from the White House released an estimated 243 million gallons of wastewater into the Potomac River, officials say. The collapse occurred on January 19 along the river near the Chesapeake and Ohio Canal in Montgomery County, Maryland.
DC Water, which operates the pipe, equates the spill to roughly 368 Olympic-sized swimming pools. Most of the discharge occurred in the first five days following the collapse, before interim bypass pumping — used to reroute sewage around the damaged section — began. Analysis of river flow data indicates the estimated peak wastewater release, about 40 million gallons per day, amounted to roughly 2% of the Potomac’s flow during that period.
When crews accessed the damaged segment they found a substantial blockage of boulders and large rocks inside the ruptured pipe. Removing that obstruction will require heavy machinery, manual labor and specialized equipment being brought in from Florida and Texas. DC Water estimates clearing the blockage will take four to six weeks, and says it cannot fully assess the pipe’s damage or set a timeline for complete repairs until the rocks are removed.
The authority has cautioned there is a “residual risk” of additional overflows until full repairs are completed, though it expects any further releases to be minimal. DC Water also reports ongoing water-quality monitoring and says that, since February 1, E. coli concentrations downstream of the collapse have remained within the U.S. Environmental Protection Agency’s acceptable range for primary-contact recreational activities.
Clean-water advocates and local groups have pushed for public health warnings. Betsy Nicholas, president of the Potomac Riverkeeper Network, said, “right now, the Potomac River is not safe.” The Riverkeeper Network, working with University of Maryland scientists, reported that water samples taken nine days after the collapse showed fecal-bacteria levels more than 2,700 times the safe limit set by Maryland and Virginia.
DC Water says it will continue monitoring the river and working on repairs but will not provide a full repair timeline until the rock blockage is cleared and the extent of damage can be assessed.