Well water in Lac du Flambeau, Wisconsin
In Lac du Flambeau, 6% of 51 private wells tested between 2005 and 2025 had arsenic above the Wisconsin enforcement standard (10 ug/L), according to the UWSP Well Water Quality Viewer.
325 private wells tested 2011 to 2024 in state summaries; 4 individual samples from 4 wells, 1982 to 1993. Data refreshed September 9, 2026.
What homeowner tests found
Wisconsin Well Water Quality Viewer samples: private wells tested and reported to the state, 2011 to 2024. 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 Lac du Flambeau who sent a sample to the state lab, the health-based limits most often exceeded were arsenic (6% of 51 wells) and nitrate (<1% of 325 wells). These are ordinary wells tested by their owners, so the shares are the best available picture of a typical well here, with one caveat: people test more often when they suspect a problem.
What to test for in Lac du Flambeau
- Volatile organic compounds (VOCs)3 leaking underground storage tank sites on record locally.
- Arsenic6% of 51 local wells tested were above the Wisconsin enforcement standard.
- Nitrate<1% of 325 local wells tested were above the Wisconsin enforcement standard.
- Coliform bacteriaRecommended for every private well, every year.
- RadonMedian local reading is 420 pCi/L.
- IronDetected in 100% of local samples.
- ManganeseDetected in 100% of local samples.
- ChlorideDetected in 100% of local samples.
Contamination sources on record in Lac du Flambeau
Wisconsin DNR records 3 leaking underground storage tank sites in Lac du Flambeau, among 33 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.
- 3
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 5
- lined landfills and transfer facilities
- 25
- other remediation projects
Treatment that fits the local profile
- Arsenic
- Point-of-use reverse osmosis; Adsorptive media (iron-based) whole-house; Anion exchange
- Iron
- Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
- Manganese
- Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
- Chloride
- Point-of-use reverse osmosis; Distillation
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Common questions
Is there arsenic in well water in Lac du Flambeau?
Arsenic was detected in 100% of 4 public well samples in Lac du Flambeau, 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 Lac du Flambeau?
The median radon level across 4 public samples in Lac du Flambeau was 420 pCi/L, with a high of 640 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Lac du Flambeau?
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 Lac du Flambeau. 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 9 contaminants in Lac du Flambeau, up to 325 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: 33 regulated sites located in Lac du Flambeau. 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.