Heavy rains expected Monday may help environmental recovery following a historic raw sewage spill in the Potomac River.
On Jan. 19, a section of the Potomac Interceptor sewage line collapsed, releasing hundreds of millions of gallons of raw sewage into the river. DC Water announced on Saturday that repairs to the line were complete and that wastewater was now flowing safely through the pipe.
During repairs, bypass pumps channeled sewage through the Chesapeake & Ohio Canal. Those pumps have now been turned off, and the cleanup of the canal began Monday with crews vacuuming sludge from the waterway.
Weather forecasts predict rain on Monday, which DC Water says will help flush residual waste from the canal. “There is no danger expected from the rain,” the agency said.
For long-term restoration, crews are finishing a freshwater dam at Lock 14 of the canal, which is upstream from the collapse site. DC Water plans to use the dam to help flush remaining contaminants from the canal.
“This operation was extremely challenging, but our teams rose to the occasion, working tirelessly through harsh weather and tough conditions. Their expertise, dedication, and collaboration were key to our success,” DC Water CEO David Gadis said.
The spill has also drawn scrutiny from federal lawmakers. Republicans on the House Energy and Commerce Committee launched an investigation into the incident, requesting documents and information from DC Water about the failure of the aging Potomac Interceptor and the agency’s response to the spill.
Lawmakers said they want to understand better whether infrastructure issues or oversight failures contributed to the release.
Local officials have also pressed the utility for answers. Members of the Council of the District of Columbia questioned DC Water leadership during a recent hearing about the timeline of the collapse and the agency’s maintenance and inspection practices for the sewer line.
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DC Water did not think the sewage pipe was in imminent danger of collapse after its last inspection in October 2024.
While cleanup continues, conditions in the river have improved. The District of Columbia Department of Health lifted its recreational advisory for the Potomac on March 2 after testing showed E. coli levels had returned to acceptable limits for boating and fishing, though swimming remains prohibited without a special permit.
