Dozens of residents in 18 apartment buildings are without water Thursday after a water main break Wednesday night in a Southeast neighborhood.

The incident happened at 13th Street and Trenton Place SE. Crews are working to repair the 20-inch water main break, according to D.C. Water officials. They expected that the 150 affected customers would be without running water until 3 p.m. Thursday.

As of early morning, there were no road closures, but crews had to dig a large hole to get to the troubled area.

The incident began Wednesday night around 8 p.m.

“We don’t know what caused it,” said Emanuel Briggs, a D.C. Water spokesman. “These break all the time, and we get out there and address it. They are old pipes, old infrastructure.”