Well water in Trimbelle, Wisconsin

In Trimbelle, 11% of 119 private wells tested between 1998 and 2025 had nitrate above the Wisconsin enforcement standard (10 mg/L), according to the UWSP Well Water Quality Viewer.

119 private wells tested 2011 to 2023 in state summaries; 1 individual samples from 1 wells, 1968. 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 2023. 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
Lead	3	33%	3	171	171	15 ug/L
Total coliform	16	13%
Nitrate	119	11%	3.2	12.7	18	10 mg/L
Chloride	32	0%	12.1	107	197	250 mg/L
Arsenic	15	0%	0	7	7	10 ug/L
Iron	2	0%	0	35	35	300 ug/L
Sodium	2	0%	0	6.8	6.8	20 mg/L
E. coli	2	0%
Copper	2	0%	0	0.181	0.181	1.3 mg/L
Manganese	2	0%	0	0	0	300 ug/L

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What this means

Among homeowners in Trimbelle who sent a sample to the state lab, the health-based limits most often exceeded were total coliform (13% of 16 wells) and nitrate (11% of 119 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 Trimbelle

Volatile organic compounds (VOCs)1 leaking underground storage tank site on record locally.
Total coliform13% of 16 local wells tested were above the Wisconsin limit (any detection).
Nitrate11% of 119 local wells tested were above the Wisconsin enforcement standard.
Coliform bacteriaRecommended for every private well, every year.
IronDetected in 100% of local samples.

Contamination sources on record in Trimbelle

Wisconsin DNR records 1 leaking underground storage tank site in Trimbelle, among 6 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.

1: leaking underground storage tank siteGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
1: lined landfill or transfer facility
4: other remediation projects

Treatment that fits the local profile

Total coliform: Inspect and repair the well cap and casing, then shock chlorinate and retest; UV disinfection whole-house; Chlorination system
Nitrate: Point-of-use reverse osmosis; Anion exchange; Distillation
Iron: Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration

Get your Trimbelle water tested at home

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Common questions

How often should I test a private well in Trimbelle?

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: 1 samples in Trimbelle. 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 Trimbelle, up to 119 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: 6 regulated sites located in Trimbelle. 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.