(WUSA9) -- WSSC sent out an alert to residents in the Derwood area near Shady Grove Metro to inform them about a water main break on Tuesday morning.
WSSC says the water main break happened in the 7800 block of Briardale Terrace in Rockville.
WSSC says in its alert: "The main has been shut down for repair. Service loss possible up to 6 hrs. Traffic delays possible."