DC Water investigation details Potomac Interceptor failure
DC Water has released a condition assessment report detailing the January collapse of a section of the Potomac Interceptor, outlining prior inspection findings and the utility’s ongoing emergency response to the major wastewater infrastructure failure.
The sanitary sewer line failure occurred Jan. 19 along the Potomac Interceptor, prompting an extensive review of inspection records, engineering assessments and video documentation for the affected pipeline segment. According to DC Water, four internal inspections conducted over the past seven years identified signs of typical aging—such as exposed aggregate and surface reinforcement—but did not indicate an imminent risk of structural failure.
Following the collapse, DC Water crews initiated emergency repair and stabilization work on the interceptor, including reinforcing upstream sections of the pipe with geopolymer lining to restore structural integrity. Repairs are continuing as crews prepare to address the downstream portion of the damaged pipeline.
The utility is also working with federal and state agencies, including the U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, National Park Service and the Maryland Department of the Environment, on environmental remediation efforts. Cleanup activities include removing contaminated soil and debris and restoring vegetation in areas affected by the incident along the Potomac River corridor.
DC Water said rehabilitation of the interceptor segment had already been planned to begin later this year as part of ongoing infrastructure renewal efforts, and the utility will continue providing updates as repairs and environmental restoration work progress.
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