With the city of Crawfordsville under a boil order, much concern has been focused on keeping both city and private wells safe from contamination. The Iowa Department of Natural Resources says once a well is subject to flooding or another source of groundwater, bacteria and viruses can enter the water supply making it unsafe for consumption and bathing. Groundwater can also damage the wells pump components. The DNR says only a certified drinking water laboratory and a certified well contractor can determine if water has become safe for use again. For information, call the Iowa DNR.