The Minnesota Department of Health (MDH) is responsible for monitoring pollution in public wells within wellhead protection areas (WHPAs), including nitrate. The MDA coordinates with the MDH to obtain monitoring data from public water suppliers that collect nitrate samples.
The MDA and the MDH evaluate the nitrate results to determine if they meet the screening criteria and are the most representative of the raw water. The samples could include raw water, finished water, or water from other area wells; however raw water is more appropriate for understanding actual nitrate conditions. If the opportunity exists, nitrate data from private wells within WHPAs will be considered as well.