| In 1980, Aldicarb was the first pesticide
found in Wisconsin groundwater near Stevens Point in the Central Sands
Area. Aldicarb was used on potato crops to control insects.
As of 1992, 39 different pesticides have been detected in Wisconsin
groundwater with 17 of these exceeding the State
Groundwater Enforcement Standards. 66
Atrazine, an herbicide used to kill weeds in corn fields, is one of the most commonly found pesticides in Wisconsin and Portage County groundwater. In Portage County, atrazine was detected in 40% of the private wells tested with 3% exceeding the standard of 3 ppb. 7
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A partial list of pesticides found in Wisconsin's water include:
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