BAYFIELD (AP) -- Residents in the northern Wisconsin town of Bayfield must boil their water after coliform bacteria was found in the town's water supply.
The Wisconsin Department of Natural Resources says the water underwent routine tests last week and tested positive for coliform bacteria on Sept. 20 and Sept. 23.
Officials are advising residents to boil water used for drinking and food preparation for at least one minute as a precaution.
Ken Scherer, a DNR water supply engineer, says the bacteria are generally not harmful but they indicate that other harmful organisms could have entered the water supply.
Officials plan to do more testing to isolate the source of the contamination.
