LOS ANGELES (CBSLA.com) – A water line on top of a steep hill in Beverly Crest broke Monday, causing a mudslide that buried the backyard of a house down below.

A city inspector said a two-inch PVC pipe at a house in the 9000 block of West Burroughs Road ruptured, sending mud and water rushing downhill.

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What used to be a swimming pool turned into a pool of mud. The entire patio was covered in muck.

Sydney Melnick said her mom was home next door at the time. “She said it sounded like there was a huge waterfall outside. When I got home, there was all this mud all over the ground,” the girl said.

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A neighbor told CBS2’s Erica Mandy that no one is currently living in the house. No mud made it past the back door.

It is unclear if the rain caused the hillside to separate and the plastic pipe to break.

There are concerns that more rain will cause more mud and debris to roll down.

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A city geologist is expected to come out and take a look on Tuesday.