Well water in Brookfield, Wisconsin
In Brookfield, none of 57 private wells tested between 1989 and 2024 had nitrate above the Wisconsin enforcement standard (10 mg/L), according to the UWSP Well Water Quality Viewer.
57 private wells tested 2015 to 2018 in state summaries; 4 individual samples from 2 wells, 2000 to 2021. Data refreshed September 9, 2026.
What homeowner tests found
Wisconsin Well Water Quality Viewer samples: private wells tested and reported to the state, 2015 to 2018. Shares are against the level the state applies to each contaminant, named in the last column; several are stricter than EPA.
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What this means
Among homeowners in Brookfield who sent a sample to the state lab, no health-based limit was exceeded often enough to publish a share. That is good news, but a single well can still be the exception.
What to test for in Brookfield
- Volatile organic compounds (VOCs)68 leaking underground storage tank sites on record locally.
- Coliform bacteriaRecommended for every private well, every year.
- RadonMedian local reading is 410 pCi/L.
- PFOAAbove the limit in 1 of 1 local samples; too few to quote a rate.
- ManganeseDetected in 100% of local samples.
- NitrateRecommended for every private well, especially near farms or septic systems.
Contamination sources on record in Brookfield
Wisconsin DNR records 68 leaking underground storage tank sites in Brookfield, among 211 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.
- 68
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 3
- lined landfills and transfer facilities
- 140
- other remediation projects
Treatment that fits the local profile
- Manganese
- Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
Get your Brookfield water tested at home
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Common questions
Is there arsenic in well water in Brookfield?
Arsenic was detected in 100% of 1 public well samples in Brookfield, and 0% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.
How high is radon in well water in Brookfield?
The median radon level across 2 public samples in Brookfield was 410 pCi/L, with a high of 510 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Brookfield?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Sources
- USGS Water Quality Portal: 14 samples in Brookfield. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
- Wisconsin Well Water Quality Viewer samples: summaries for 2 contaminants in Brookfield, up to 57 wells each. Private well samples compiled by the UWSP Center for Watershed Science and Education from the DNR Groundwater Retrieval Network, DATCP surveys, the UWSP Water and Environmental Analysis Lab and county health programs, published in the Wisconsin Well Water Quality Viewer with Wisconsin DHS. Samples are located to the town, village or city they fall in; one result per well and parameter (the latest) so repeat samples do not double count; wells without a state well number are keyed by location. Shares are against Wisconsin NR 140 enforcement standards (arsenic 10 ug/L, nitrate 10 mg/L as N, manganese 300 ug/L, lead 15 ug/L, copper 1.3 mg/L) and the iron and chloride secondary levels. Many samples were submitted by homeowners with a reason to test, so shares can run above a random survey. Retrieved September 9, 2026.
- Wisconsin DNR regulated sites: 211 regulated sites located in Brookfield. Open and closed remediation activities (BRRTS, including leaking underground storage tanks and spills) and landfill and waste sites from the Wisconsin Department of Natural Resources. Retrieved September 9, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.