The wide use of pesticides for agricultural and residential activities has a significant impact on groundwater quality in the United States. Currently, the occurrence of pesticides in groundwater has been monitored in Wisconsin with an emphasis on agricultural land by multiple agencies.

Atrazine has been detected in groundwater in parts of North America. Despite a downward trend in atrazine use over the past decade (WASS, 1991), Wisconsin has not escaped the environ­mental ...