Measures are in place to help protect downstream drinking water infrastructure

DC Water is accelerating rehabilitation work on a section of the Potomac Interceptor at Muddy Branch near Pennyfield Lock (Lock 22) in Potomac, Maryland. Inspections found structural deterioration, including significant corrosion and exposed rebar, that requires immediate attention.

Following a 27-day closure, DC Water will reopen a section of Piney Branch Parkway between Arkansas Avenue and Beach Drive NW early Monday morning, restoring an important cross-town connection for thousands of District commuters. During the closure, a section of the road was temporarily relocated for construction of DC Water’s Piney Branch Tunnel Project.

** Advisory is Lifted as of 9:00 P.M., June 6, 2026**

DC Water has lifted the precautionary Boil Water Advisory for parts of Upper Northwest DC after testing confirmed the water is safe to drink. All customers in the impacted area may use tap water for all purposes after following the instructions provided below.