The National Park Service (NPS) has completed an Environmental Assessment (EA) and approved DC Water’s proposal to move forward with construction of the Potomac River Tunnel project.

A Finding of No Significant Impact (FONSI) was signed by the NPS Acting Director, Region 1 – National Capital Area on March 30, 2020, selecting the construction of the Potomac River Tunnel as the preferred alternative and concluding the National Environmental Policy Act (NEPA) process.

The proposed project, primarily on NPS land in northwest D.C., will improve water quality and reduce combined sewer overflows (CSOs) to the Potomac River. The Potomac River Tunnel is part of DC Water’s Clean Rivers Project.

The Potomac River Tunnel will reduce the volume of CSOs by 93%, and the frequency of overflow events from approximately 74 to 4 events in a year of average rainfall. Click here for further information on the project, here and us/109 for tunnelbuilder archive and also visit  https://www.dcwater.com/. 16/20.