Boulder residents are being advised not to drink or even bathe in city water after a problem with one of the city’s water storage tanks was discovered late Tuesday.

According to Jon Dilliard, public water supply bureau chief for the Montana Department of Environmental Quality, a hatch on one of the water storage tank had been pried open by someone.

“We assume someone went there and had to use some sort of tool,” Dilliard said. “The FBI was contacted; I don’t know what their response is gong to be other than looking into this and checking it out. The criminal investigation division of the EPA also is involved, since accessing or tampering with a public water supply is a federal crime.”

An official with the FBI couldn’t be reached for comment. The EPA declined to comment on whether the federal agency had an ongoing investigation into the matter.

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