Final Township Testing Nitrate Report: Winona County 2016-2017

In 2016-2017, private wells in the Winona County study area (13 townships) were sampled for nitrate-N. Samples were collected from private wells using homeowner collection and mail-in methods. These initial samples were collected from 940 wells representing an average response rate of 40 percent of homeowners. Well log information was obtained when available and correlated with nitrate-N results. The MDA completed follow-up sampling and well site visits at 285 wells in 2017. A follow-up sampling was offered to all homeowners with wells that had a detectable nitrate-N result.