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The MDA Township Testing Program tests private wells for nitrate in areas of the state with the greatest potential for nitrate contamination. The initial results represent what people are drinking regardless of well type or well age and nitrogen source(s). The percentage value shown in the legend for this layer reflects the percentage of wells by township included in the initial dataset that have nitrate values at or above the drinking water standard of 10 ppm. The data provides an important indication of areas with the greatest concerns for elevated nitrate in private wells. Data source: More information on the Township Testing Program can be found on the Minnesota Department of Agriculture website (https://www.mda.state.mn.us/township-testing-program). |