Sewage Cleanup in Washington, DC

Washington DC's sewage backup risk is managed by DC Water's combined sewer system, which serves approximately 40 percent of the District with pipes that carry both sanitary sewage and stormwater runoff. DC Water's $2.7 billion Clean Rivers Project — which includes the 8-mile Anacostia River Tunnel and the Potomac River Tunnel — is the largest infrastructure investment in DC history and is substantially reducing combined sewer overflow into the Anacostia River. However, the tunnel project addresses river overflows rather than residential backups: individual properties with below-grade plumbing connected to combined sewers in Capitol Hill, Southwest DC, and the Anacostia waterfront remain vulnerable to sewage backflow when the upstream collection system reaches hydraulic capacity during intense rainfall. The most vulnerable properties are basement-level units and ground-floor commercial spaces in older Southwest DC, Georgetown, and Capitol Hill buildings with gravity-connected drain systems that lack backflow prevention. DC Water's Customer Care and billing department maintains a Sewer Backup Assistance Program for confirmed DC Water system overflow events, but documentation requirements are strict and remediation must begin promptly to preserve legal standing. Biohazard cleanup in DC properties must meet DC Department of Health Category 3 water contamination standards.