Groundwater Standards for Pesticides

​Proposed NR 140 Cycle 10 Groundwater Standards for Pesticides

DATCP’s Role with Groundwater Protection and Cycle 10

State law (Wis. Stat. § 160) outlines the groundwater monitoring responsibilities of state agencies. The statute requires that regulatory agencies communicate with the Wisconsin Department of Natural Resources (DNR) and Department of Health Services (DHS) to identify when substances are detected in groundwater that exceed an existing enforcement standard or preventative action limit, or when compounds are detected that do not have existing state or federal standards. To meet these responsibilities, DATCP collects groundwater samples from private drinking wells, monitoring wells, and irrigation wells located within agricultural areas. DATCP analyzes these samples for approximately 100 pesticide compounds plus nitrate through its lab. DATCP also provides the DNR with a list of pesticides to consider for what is referred to as the tenth cycle of new standards development for groundwater law (Cycle 10).

For questions about proposed standards for pesticides included on the NR 140 Cycle 10 list, email

More information for all proposed NR 140 standards and the rule making process is available at​.​

For public health concerns about proposed NR 140 standards visit​​

Cycle 10 Groundwater Pesticide Fact Sheets