More than 9,200 Department of Water and Power customers in Granada Hills and Porter Ranch remained without water service Friday, and the interruption may last through the weekend.

While the utility repairs a broken underground valve, customers remain on a boil water alert and are being urged not to use their running tap water if it happens to be working.

The affected area is bounded roughly by Rinaldi Avenue on the south, Balboa Boulevard on the east, De Soto Avenue on the west and the foothills and hills to the north, according to the DWP.

According to the agency, water crews were conducting repair work on Tuesday at a pump station that connects to a 10 million-gallon water tank that serves the area when a valve that controls the flow of water failed to open.

“As a result, the water f

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