WASHINGTON — DC Water officials said recent snow and rain have not worsened contamination levels linked to the Potomac sewer line failure, even as crews confront new engineering hurdles and unresolved questions about how repair costs will be divided.
The agency confirmed that Mayor Muriel Bowser previously sought full federal reimbursement for the sewer collapse under disaster aid provisions. However, the U.S. Army Corps of Engineers indicated Monday that the current agreement covers only 75 percent of the estimated $20 million repair cost. The remaining share is expected to be paid by DC Water and its wholesale customers, including Montgomery, Prince George’s, Fairfax, and Loudoun counties. Officials said discussions on the precise cost allocation are ongoing.
Despite recent storms, DC Water reported that the Potomac River has now gone 15 consecutive days without any sewage overflow. The agency credited extensive stormwater mitigation work carried out with support from the Army Corps, which joined the response under federal disaster assistance.
Army Corps representatives said their teams have been working continuously and will remain on site until the project is completed. Meanwhile, repair crews have encountered a significant obstacle during excavation work: a 30-foot rock dam that has complicated access to the damaged pipe.
Previously, workers had been entering the compromised pipe to remove large rocks and debris. DC Water officials said structural assessments later determined the pipe was too unstable to safely allow personnel inside. As a result, engineers have shifted strategy and begun excavating a new 30- to 40-foot section to create an alternative access point.
Agency leaders emphasized that the work remains complex and highly specialized. Equipment required for the operation has been transported from multiple states, including Florida, Texas, and Michigan, underscoring the scale of the infrastructure challenge.
During a meeting with the Metropolitan Washington Council of Governments, DC Water CEO David Gadis shared updates and images of the ongoing repairs. He also outlined longer-term plans, noting that the utility intends to invest more than $600 million over the next decade to strengthen the Potomac Interceptor and improve system resilience.
Officials said the newly discovered rock formation is not expected to delay the overall schedule. DC Water continues to project that full flow through the system will be restored by mid-March.
The utility plans to hold two public meetings this week to brief residents and answer questions about the sewer incident and the ongoing environmental safety measures.
