The D.C. Water and Sewer Authority said a 48-inch valve had to be adjusted while crews were working at Soldiers Home.
WASA opened a valve in the area, which rebuilt water pressure. Customers who have flushometers may have had to restart them.
The following ZIP codes were affected:
WASA also reported a water main break in the 1200 block of 12th and O streets in Northwest.
Crews were repairing a 6-inch broken main. WASA estimated the main would be fixed by 4:30 p.m.