Ground water occurs everywhere in Minnesota, but its availability for water supplies vary throughout the state. Ground water supplies about 75 percent of Minnesota's drinking water and nearly 90 percent of the water used for agricultural irrigation. Since 1944, the Minnesota Department of Natural Resources has managed a statewide network of water level observation wells. Data from these wells are used to assess ground water resources, determine long-term trends, interpret effects of pumping and climate, plan for water conservation, evaluate water conflicts, and otherwise manage the resource. About 750 observation wells are being monitored in the network. We have filtered this well data to show only the ones that are currently in use and have 20 or more years of data. By clicking on the web link you can get all the historic water level data for that location. * Well descriptions and water level data are available for each of the DNR observation wells. * Measured water levels are reported as depth, in feet, below the land surface. The number reported is actually the negative of the depth when plotted. These negative values describe ground water rise and fall in proper perspective. As you zoom into the map different data types will appear for you to explore; such as groundwater provinces, DNR observation wells, groundwater recharge rate data and major irrigation well sites.