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LeMasters, Gary S.; Doyle, Douglas J. / Grade A dairy farm well water quality survey
[DNR-058] (1989)

Introduction,   pp. 1-2 PDF (660.9 KB)

Page 2

Regulatory Framework
The Wisconsin Department of Agriculture, Trade and Consumer Protection
(WDATCP) regulates the bulk storage of fertilizers and the bulk storage and use
of pesticides. Chapter 160 of the Wisconsin Statutes, "Groundwater Protection
Standards", was adopted in 1984. It established an administrative process to
produce numerical standards, comprised of enforcement standards and
preventive action limits, for substances in groundwater. The standards are
adopted by the Wisconsin Department of Natural Resources (WDNR) based
upon recommendations by the Wisconsin Department of Health and Social
Services (WDHSS). Standards that have been adopted for pesticides are in
Table 1. The standards for alachlor, atrazine, metolachlor and butylate were
adopted in 1988 while the remainder were adopted in 1985.
The Groundwater Law mandates that WDATCP consider the need for
substance-specific rules each time the WDNR establishes groundwater standards
for a pesticide. The Grade A Dairy Farm Well Water Quality Survey was
designed to provide information to help WDATCP determine the need for rules
for atrazine and alachlor. These two herbicides are used on the majority of the
crop acres in the state.
Pesticide Use in Wisconsin
In 1985 the Wisconsin Agricultural Statistics Service (WASS) conducted a
pesticide use survey, with data reported for each of the nine Agricultural
Statistics Districts shown in Figure 1. The acres treated statewide with all
herbicides in 1985 and the acres of all crops treated with atrazine for each of
the Districts are shown in Figure 2. Atrazine was used on about 3.4 million
acres of corn and sweet corn, while alachlor was used on about 1.9 million
acres of corn, sweet corn and soybeans. The South Central Agricultural
Statistics District had the largest acreage treated with atrazine, 730,000 acres,
followed by the Southwest District with 506,000 acres.

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