Walworth County groundwater contains iron, arsenic, and PFOA at levels that exceed EPA health standards. These contaminant levels are serious enough to warrant testing and awareness among well owners in this area.
The deep limestone and sandstone layers beneath this county naturally release iron and arsenic into groundwater over time. PFOA is a human-made chemical that enters water through industrial use and landfill leakage; it persists in groundwater because it breaks down very slowly in the environment.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the limestone bedrock below. As water moves slowly through the carbonate rock layers, it dissolves these minerals in significant amounts. Very hard water is widespread across wells throughout Walworth County.
Arsenic, iron, and PFOA are found at levels exceeding EPA health standards in wells across Walworth County. Arsenic can damage organs and increase cancer risk over time. Iron itself is not a health concern, but PFOA is a chemical linked to health problems including kidney and liver effects. These contaminants are colorless and odorless, so you cannot detect them without testing.
Walworth County has very hard water, which causes white scale buildup on faucets, shower heads, and inside pipes. The high iron leaves rust-colored stains on sinks, toilets, and laundry. Very hard water shortens the lifespan of water heaters, dishwashers, and other appliances. You may notice reduced water pressure from mineral buildup or a metallic taste.
We recommend testing your well with a comprehensive metals and minerals panel, since multiple contaminants exceed standards here. Every well is different, and your well may have higher or lower levels than what is common in the county. Testing is the only way to know what is actually in your water so it can be properly treated. A comprehensive panel runs $200-400 and can reveal what treatment systems would work best for your home.
Not sure if your well is affected? Get certified results in 5–7 days.
Test Your Well Water with Tap Score →| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Iron | 170 | 69% | High | High | |
| Manganese | 163 | 23% | High | High | |
| Arsenic | 23 | 17% | Moderate | High | |
| PFOA ⓘ municipal | 44 | 9% | Moderate | Moderate | |
| PFOS ⓘ municipal | 44 | 5% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Chloride | 156 | 3% | High |
Moderate
Elevated concentration, not % above limit
|
|
| Nitrate | 138 | 1% | High | Low | |
| Fluoride | 129 | 0% | High | Low | |
| HFPO-DA (GenX) ⓘ municipal | 44 | 0% | Moderate | Safe | |
| Lead | 23 | 0% | Moderate | Low | |
| Nitrite | 62 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 44 | 0% | Moderate | Low | |
| PFNA ⓘ municipal | 44 | 0% | Moderate | Low | |
| Radon | 7 | 0% | Low | Low ⓘ | |
| Sulfate | 166 | 0% | High | Low | |
| Uranium | 19 | 0% | Moderate | Low | |
| Hardness | 172 | — | High | Low | |
| PFBS ⓘ municipal | 44 | — | Moderate | Low | |
| pH | 186 | — | High | Low | |
| Sodium | 102 | — | High | Low |
MCL = Maximum Contaminant Level (EPA limit for public water; used as benchmark for private wells). Distribution shows % of sampled wells in each concentration band. Methodology.
* Microbial contaminants (E. coli, coliform) reflect only samples from the last 10 years.
Data shows potential risk — a certified test confirms whether your water is affected.
Order a Tap Score Test →Population-level CDC data. Not individual risk prediction.
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