DC Clean Rivers (DC Water) Division PR-C – CSO 025/026 Sewer Separation Project

DC Water is continuing to implement its Clean Rivers Project, a system of tunnels, diversion sewers and green infrastructure that will reduce neighborhood flooding and sewer overflows into the District’s waterways. The Combined Sewer Overflow (CSO) 025/026 Sewer Separation project is part of the DC Water Clean Rivers Project’s goal to reduce the volume of combined sewer overflows to the Potomac River to improve water quality and meet Consent Decree requirements. In addition to constructing a tunnel and green infrastructure, DC Water is using sewer separation for two CSO outfalls—CSOs 025 and 026.

The concept of sewer separation means routing sanitary flow to new sewers that will exclusively carry sanitary flow and convey storm water runoff through the existing piping system that formerly carried combined storm and sanitary flow. The CSO 025/026 sewer system is located within Georgetown, south of the C&O Canal, and collects flow from the blocks bounded by Cecil PL NW, Wisconsin Ave NW, 31st ST NW, and Thomas Jefferson ST NW.

L. S. Caldwell & Associates, Inc. (LSC) has responsibility for the development, implementation, and monitoring of the Fair Share Objective initiatives for the District of Columbia Water and Sewer Authority’s (DC Water) Clean Rivers Project. This $2.6 billion program is the result of a Consent Decree signed by the District of Columbia, the Environmental Protection Agency and the Department of Justice. DC Water was required to clean up the Anacostia and Potomac Rivers by 2025.