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St. Croix County committee hears groundwater update; staff propose multi-year nitrate plan
Summary
County staff presented new groundwater monitoring and nitrate-screening data showing persistent nitrate issues in central St. Croix County and proposed a multi‑year, USDA‑funded program of best‑management practice contracts; committee members urged seeking funding and sharing results with the full board.
St. Croix County staff outlined the results of 2025 groundwater monitoring and proposed a multi‑year nitrate‑reduction plan at the Community Development Committee meeting on Jan. 15.
Patty, the county water resource specialist, said the county’s nitrate-screening clinics and the Community Groundwater Monitoring Program (CGMP) show a consistent, geographically concentrated problem. “Nitrate is the most common, groundwater contaminant in Wisconsin and in Saint Croix County,” Patty said, and added that clinic screening results averaged 7.77 milligrams per liter while the CGMP average was 5.48 mg/L. Patty said 27% of clinic screening samples and about 15% of CGMP samples exceeded the EPA…
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