Protecting groundwater aquifers that supply community drinking water supplies is critical for communities in Winona County. Well #219210 located within the Altura Drinking Water Supply Management Area (DWSMA) is an unused, multi-aquifer municipal well that poses a risk to the community drinking water supply. This well intersects with multiple aquifers, including the Prairie Du Chien, Jordan, Tunnel City/Lone Rock, and Wonewoc. These are primary aquifers used by the majority of drinking water wells in the region.