Residents of the Pocahontas County town of Fonda in north-central Iowa will have to continue boiling their water at least through tonight. Kevin Baskins of the Iowa Department of Natural Resources says city officials found something wrong with the water supply Monday. He says city officials noticed the chlorine levels in the water, prompting them to investigate. He says they discovered that a hatch on top of the water tower had been vandalized and broken into. Baskins says they don’t know if something was dropped into the water. He says they’re still awaiting tests to find out. He says they’ve taken a number of water samples that’re now being analyzed by the University of Iowa Hygienic Lab. Baskins says they won’t have the results of the tests until later tonight (Tuesday). Fonda residents are being asked to continue boiling water to use for drinking or food preparation until all the test results are known.