Updated Minnesota Groundwater Protection Rule maps available

The MDA has also made changes to the Fall Nitrogen Fertilizer Application Restrictions map.

Algae in Lake Okabena
FILE PHOTO: Blue-green algae collects along the Lake Okabena shoreline at Sailboard Beach. Warmer weather and calmer winds fueled the bloom, which is caused by excess nutrients in the lake.
Julie Buntjer/Daily Globe
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ST. PAUL — The Minnesota Department of Agriculture (MDA) has issued updated maps that will help farmers across the state comply with the Groundwater Protection Rule. The rule restricts fall application of nitrogen fertilizer in areas vulnerable to contamination and it outlines steps to reduce the severity of contamination in areas where nitrate is already elevated in public water supply wells.

An updated map of public water supply wells with elevated nitrate levels can be found at

The MDA has also made changes to the Fall Nitrogen Fertilizer Application Restrictions map, which can be viewed at . The restriction of fall application on these acres will begin Sept. 1.

Farmers are encouraged to check the new maps prior to the fall of 2022 to determine if their fields are subject to these restrictions.

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