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Under the Groundwater Protection Rule, the MDA determines the mitigation levels for community water supply wells and their Drinking Water Supply Management Areas (DWSMAs) that have nitrate levels greater than or equal to 5.4 mg/L (or parts per million (ppm)), based on monitoring data provided by MDH. Under the Rule, wells which have nitrate levels at or above 5.4 ppm but less than 8 ppm at any point in the previous ten years will be determined to be at Mitigation Level 1 and wells with nitrate at or above 8 ppm at any point in the last ten years will be determined to be at Mitigation Level 2, unless the MDA determines there is a point source causing the well to exceed these levels or the MDA delays the determination of a mitigation level decision for good cause.
Data Source: More information on mitigation level determination can be found on the Minnesota Department of Agriculture website (https://www.mda.state.mn.us/mitigation-level-determination). |