The Ambient Groundwater Quality Study began in 1999 to establish a water quality baseline in the County and to track changes in water quality over time. From 1999 to 2003, the same set of bedrock wells completed in the Prairie du Chien Aquifer and the Jordan Aquifer were sampled for general chemistry and contaminants related to industrial processes, nitrate and pesticide use. In 2004, wells screened in the sand and gravel aquifer were added to the study.
In 2004, laboratory analysis by the United States Geological Survey showed levels of pesticides and nitrate of concern. A
Fact Sheet explains details about the study and its findings. See the
Ambient Groundwater Study.