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DC Water Releases Key Findings on Extent of Sewer Overflow and Potomac River Impact
DC Water is releasing new findings regarding the environmental impacts following the January 19, collapse in a section of the Potomac Interceptor. Based on flow monitoring data collected before and after interim bypass pumping was activated, DC Water estimates approximately 243 million gallons of wastewater has overflowed from the collapse site.
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DC Water Identifies Significant Rock Blockage in Potomac Interceptor, Impacting Cleaning and Repair Timeline
Update on Extended Repairs, Safety Measures, and Water Quality Monitoring
Overnight CCTV inspection of the Potomac Interceptor revealed the blockage inside the collapsed sewer line is far more significant, showing a large rock dam stretching approximately 30 feet downstream of the original failure.
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UPDATE: Potomac Interceptor Cleaning and Repair Effort, February 4, 2026
DC Water and its contractor are working to clean debris from a damaged section of the Potomac Interceptor, a sanitary sewer line that collapsed on January 19, along Clara Barton Parkway and the 495 interchange and the C & O Canal National Historical Park. While limited overflows occurred earlier in the week, no overflows from the site were reported today. Here is an update on the cleaning and repair efforts underway:
Containment Efforts
No overflow from the pipe was reported today. The pump installed at the collapse site is effectively managing wastewater levels within the sinkhole and preventing ... Read More
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A new review of the Potomac Interceptor collapse shows 243 million gallons of wastewater has overflowed from the site. Most of that (194 million gallons) happened early in the incident, before the bypass pumping system was fully in place. Since then, the volume reaching the river has dropped significantly. Recent water-quality sampling along the Potomac has shown results within the EPA’s acceptable range for primary contact recreation at the majority of monitoring locations. Access inside the interceptor is still limited because of the large rock blockage identified during inspection. Crews are preparing the equipment needed to safely reach the damaged section and finalize the repair approach. Read the full update, including detailed water-quality results, here: https://www.dcwater.com/about-dc-water/media/news/dc-water-releases-key-findings-extent-sewer-overflow-and-potomac-river
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