You can sign up to participate in the ongoing study of the water you use daily. UW-Oshkosh and Door County are teaming up again to provide groundwater testing in the area as they have since 2019. The program's goal is not just to provide education about the importance of testing your water but to continually update its database of groundwater quality data in Door County. Last year, UW-Oshkosh tested 195 wells in the spring and 162 in the fall. According to the Door County Government website data, nitrates posed the biggest concern to residents, with 26 percent of samples showing between 2-10 mg/L of nitrates and two percent with samples of over 10 mg/L of nitrates. According to the United States Environmental Protection Agency, concentrations over 3 mg/l generally indicate contamination. The website's data also shows coliform, arsenic, and E. coli levels. Residents can apply to participate in this year’s program for a small fee by clicking this link before March 22nd. Test kits must be returned on April 5th or 6th, depending on your chosen drop-off site.