A water main break closed a section of Bock Road in Fort Washington Saturday morning, and heavy rain and a closed valve caused a sewer at a pumping station in the area to overflow, officials from the Washington Suburban Sanitary Commission said.

Lyn Riggins, a spokeswoman for the WSSC, said crews shut down the eight-inch pipe that broke in the 7400 block of Bock Road. A dozen customers will be without water while repairs are made.

Riggins said the sewer overflow at the Broad Creek Wastewater Pumping Station on Livingston Road lasted from 12:45 a.m. to 3 a.m. Saturday.

She said it was estimated that 6 million gallons of diluted wastewater overflowed but were contained on the plant grounds. Crews were posting signs in the area and will conduct any necessary cleanup, Riggins said.

She added that the drinking-water system was separate and not affected and that it was safe to drink water and flush toilets.