A broken sewer pipe about 8 miles from the White House has discharged roughly 243 million gallons of wastewater into the Potomac River, and repairs could take months after crews discovered a substantial blockage inside the ruptured pipe.
DC Water, the agency that operates the pipeline, said the collapse occurred on January 19 in Montgomery County, Md., near the Chesapeake and Ohio Canal. The spill — equivalent to about 368 Olympic-sized swimming pools — happened mostly in the first five days before crews activated interim bypass pumping to reroute sewage around the damaged section.
DC Water estimated the peak wastewater discharge at about 40 million gallons per day, roughly 2% of the Potomac’s flow at the time. While removing the blockage and assessing the pipe’s condition, officials found a large “rock dam” of boulders and debris inside the line. Clearing the obstruction will require heavy machinery, manual labor and additional equipment being brought in from Florida and Texas; DC Water estimates that removal will take four to six weeks. Officials said they cannot determine the full repair timeline until the blockage is cleared and damage is assessed.
Until permanent repairs are complete, DC Water warned there remains a residual risk of limited overflows, though those are expected to be minimal. The authority also reported 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, however, have urged public health warnings. Betsy Nicholas, president of the Potomac Riverkeeper Network, said the river “is not safe,” noting collaborative testing with University of Maryland scientists found samples taken nine days after the collapse contained fecal bacteria levels more than 2,700 times the safe limit used by Maryland and Virginia.
DC Water continues repair and monitoring work while officials weigh public messaging and next steps as cleanup and restoration efforts proceed.
