Groundwater Coordinating Council’s 2016 Report to the Legislature includes valuable sections on nitrate and pesticides
Wisconsin Groundwater Quality: Agricultural Chemicals in Wisconsin Groundwater report provides an overview of groundwater quality from the Department of Agriculture, the National Agricultural Statistics Service, and the Department of Health and Family Services. The 2008 report is the most recent available.
Nutrient Reduction Strategy is the current state initiative to reduce nutrient loading as a response to the EPA Gulf Hypoxia Action Plan. It provides statewide overview of nutrient management activities for point and non point sources. An update will be available soon.