Jackson St NE between 14th St & 16th St NE; on 14th St NE between Hamlin St & Jackson St NE; on Iriving St NE between 15th St & 14th St NERead more >
On Rhode Island Ave NE between Jackson St & 20th St NERead more >
On Summit Pl NE between U St & Uhland Terr NE; on Todd Pl NE between Summit Pl & 2nd St NERead more >
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Wastewater Flows From as far as Dulles Airport to Blue Plains

DC Water's wastewater collection system consists of the following:

  • Approximately 1,800 miles of sanitary and combined sewers
  • 16 stormwater stations
  • 75,000 catch basins and manholes
  • 22 flow-metering stations
  • 9 wastewater pumping stations

While most of the sewer system contains separate sanitary and storm sewers, combined sewers carrying both sanitary flow and stormwater drainage are prevalent in the downtown area and in older portions of the District. Combined sewer overflows (CSOs) occur during certain storm events when the combined sewer system contains too much flow and the mixture of wastewater and stormwater overflows into local waterways. There are presently 53 CSO outfalls listed in the DC Water’s National Pollutant Discharge Elimination System (NPDES) Permit.

The current CSO Abatement Program combines projects to maximize storage and minimize overflows to receiving waters. The program consists of inflatable dams, dynamically controlled weirs, outfall gates and other flow regulating devices, sewer separations and a swirl treatment facility. The Northeast Boundary Swirl Facility provides preliminary treatment including disinfection and some solids removal for combined sewage overflows prior to discharge during wet weather. The DC Clean Rivers program will further control CSOs.