Testing will continue through September 10 at six Maryland locations closest to January sewer collapse

DC Water is moving from daily Potomac River water quality testing to testing twice a week. The change is part of our continued response to the January Potomac Interceptor sewer collapse. Daily testing continued past the original July 31 end date and today will be the last day DC Water will test at the 10 current locations.

Starting on or about Aug. 7, 2026, weather permitting, drivers can expect a temporary lane closure southbound on Rock Creek and Potomac Parkway NW near the intersection of Virginia Avenue NW and F Street NW. The closure will allow DC Water crews to pour a large concrete foundation for the Potomac River Tunnel Project. The foundation will provide a strong base for the tunnel shaft, supporting the next phase of tunnel construction.

The concrete pour is scheduled to begin at approximately 11 p.m. on Friday, August 7, and continue through approximately 3 p.m. on Saturday, August 8. Once the ...

First of four emergency repairs on Potomac Interceptor finished

DC Water has finished the first of four emergency repair projects on the Potomac Interceptor sewer line. Crews completed work today to strengthen a 600-foot section of pipe at Dulles International Airport.