LOS ANGELES (KABC) -- 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 amid a heat wave in the region.

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.

"Wait until we give you the go-ahead -- but if you have to use water use as little as possible, " said Janisse Quinones, CEO and chief engineer of the LADWP.

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 cr

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