An accidental release of crude oil into Bakersfield鈥檚 municipal water system has temporarily shut down businesses and prompted an advisory for about 40 commercial customers to avoid tap water in the area south of Lake Truxtun.

Signs of a possible problem first appeared Monday afternoon, when pipes in the area started shaking and spurting water from faucets. Businesses were warned against using their taps a little more than 24 hours later, once petroleum contamination was confirmed by the operator of Bakersfield鈥檚 water system, California Water Service Co.