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Look up
data about the quality of groundwater near homes or businesses or get an estimate of groundwater availability.
Protect
the quality and quantity of groundwater for your family, business customers and community.
Learn
where your groundwater comes from and how it moves underground to reach your drinking water well and the lakes and streams you enjoy.

GCC Report to the Legislature Groundwater quality

Nearly three-quarters of us in Wisconsin rely on groundwater for our primary drinking water supply. Many schools, food processing and other businesses, hotels, taverns and restaurants are public water systems that need good groundwater quality. What does groundwater quality in Wisconsin look like?

Beginning in 2014, the department has required nitrate sampling on new wells and when pump work is done on existing wells. The map below is from the 55,000 samples collected over the first three years. The map depicts the percent of wells over 10 ppm nitrate in each county. For more information on nitrate in Wisconsin, read the nitrate section of the GCC Report.

Last revised: Thursday August 30 2018