Well water in Sharon, Wisconsin
In Sharon, 19% of 269 private wells tested between 1988 and 2025 had nitrate above the Wisconsin enforcement standard (10 mg/L), according to the UWSP Well Water Quality Viewer.
269 private wells tested 1988 to 2025 in state summaries; 36 individual samples from 26 wells, 2004 to 2019. Data refreshed September 9, 2026.
What homeowner tests found
Wisconsin Well Water Quality Viewer samples: private wells tested and reported to the state, 1988 to 2025. Shares are against the level the state applies to each contaminant, named in the last column; several are stricter than EPA.
| Contaminant | Wells tested | Above state level | Median | 95th pct | Highest | State level | |
|---|---|---|---|---|---|---|---|
| Nitrate | 269 | 19% | 3.76 | 18.7 | 27.9 | 10 mg/L | |
| Iron | 15 | 13% | 0 | 9,904 | 9,904 | 300 ug/L | |
| Total coliform | 91 | 7% | |||||
| Manganese | 17 | 6% | 0 | 812 | 812 | 300 ug/L | |
| Chloride | 103 | 0% | 10.2 | 63.7 | 167 | 250 mg/L | |
| Arsenic | 25 | 0% | 0 | 6 | 7.2 | 10 ug/L | |
| Copper | 17 | 0% | 0.019 | 0.745 | 0.745 | 1.3 mg/L | |
| Lead | 17 | 0% | 0 | 11 | 11 | 15 ug/L | |
| Sodium | 15 | 0% | 0 | 8.13 | 8.13 | 20 mg/L | |
| E. coli | 5 | 0% |
What individual samples found
Each row summarizes every public sample for that contaminant inside Sharon. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.
| Contaminant | Samples | Detected | Above limit | Median | Highest | Limit | |
|---|---|---|---|---|---|---|---|
| Uranium 2014 to 2019 | 36 | 100% | 0% | 2.26 | 8.16 | 30 ug/L EPA limit |
Sampled fewer than 10 times, too few to summarize: Arsenic (5), Radium (226 + 228) (4), Lead (2), Nitrate (2), Copper (1), Iron (2), Manganese (2), Chloride (2), Radon (2), Sodium (1).
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What this means
Among homeowners in Sharon who sent a sample to the state lab, the health-based limits most often exceeded were nitrate (19% of 269 wells) and total coliform (7% of 91 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.
Iron exceeds the state's advisory level in a sizable share of wells; this is mostly a taste, staining or diet issue rather than a toxicity one.
What to test for in Sharon
- Volatile organic compounds (VOCs)4 leaking underground storage tank sites on record locally.
- Nitrate19% of 269 local wells tested were above the Wisconsin enforcement standard.
- Iron13% of 15 local wells tested were above the Wisconsin nuisance level.
- Total coliform7% of 91 local wells tested were above the Wisconsin limit (any detection).
- Manganese6% of 17 local wells tested were above the Wisconsin enforcement standard.
- Coliform bacteriaRecommended for every private well, every year.
- RadonMedian local reading is 458 pCi/L.
- ChlorideDetected in 100% of local samples.
Contamination sources on record in Sharon
Wisconsin DNR records 4 leaking underground storage tank sites in Sharon, among 18 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.
- 4
- 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
- 11
- other remediation projects
Treatment that fits the local profile
- Nitrate
- Point-of-use reverse osmosis; Anion exchange; Distillation
- Total coliform
- Inspect and repair the well cap and casing, then shock chlorinate and retest; UV disinfection whole-house; Chlorination system
- 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
Get your Sharon water tested at home
A licensed local water treatment company tests your tap water in your home, walks you through the numbers, and quotes treatment only if something needs fixing. Free, about 30 minutes, no obligation. Tell us what you need and we match you with a company that serves Sharon.
Common questions
Is there arsenic in well water in Sharon?
Arsenic was detected in 100% of 5 public well samples in Sharon, 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 Sharon?
The median radon level across 2 public samples in Sharon was 458 pCi/L, with a high of 660 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Sharon?
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: 59 samples in Sharon. 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 10 contaminants in Sharon, up to 269 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: 18 regulated sites located in Sharon. 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.