Green Lake County groundwater contains iron, arsenic, and chloride. Iron is at levels high enough to exceed EPA health standards, while arsenic and chloride remain at low levels of concern.
The deep rock layers beneath this county naturally contain iron and other minerals that dissolve into groundwater as water moves slowly through the stone. Arsenic and chloride also occur naturally in these rocks. The thick bedrock here acts as a filter that keeps contamination from land use from reaching most wells.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the limestone and other mineral-rich rocks below. These minerals dissolve into the water as it passes through the bedrock over many years. Very hard water is common across wells throughout the county, though the exact mineral content varies from well to well.
Iron is found at elevated levels in wells across Green Lake County. Exposure to elevated iron in drinking water can cause health problems, particularly with long-term use. Iron in your water can affect your body's ability to absorb certain nutrients properly.
Wells in this county have very hard water. Hard water leaves chalky scale inside pipes and on fixtures like faucets and showerheads. The scale buildup can shorten the life of appliances like water heaters and dishwashers. You may also notice rust-colored staining on clothes, sinks, and bathtubs, or a metallic taste in your water.
We recommend testing your well water to find out what is actually in it. Every well in Green Lake County is different, and your water may have higher or lower levels than what is common countywide. A comprehensive metals and minerals panel typically costs between $200 and $400. Iron removal systems and water softeners can both help treat these concerns.
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 ⓘ |
|---|---|---|---|---|---|
| Manganese | 17 | 41% | Moderate | High | |
| Iron | 19 | 21% | Moderate | High | |
| Nitrate | 17 | 18% | Moderate | High | |
| Arsenic | 4 | 0% | Low | Low ⓘ | |
| Chloride | 18 | 0% | Moderate | Low | |
| Fluoride | 17 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 10 | 0% | Low | Safe | |
| Lead | 5 | 0% | Low | Low ⓘ | |
| Nitrite | 15 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 10 | 0% | Low | Low | |
| PFNA ⓘ municipal | 10 | 0% | Low | Low | |
| PFOA ⓘ municipal | 10 | 0% | Low | Low | |
| PFOS ⓘ municipal | 10 | 0% | Low | Low | |
| Radon | 3 | 0% | Low | Low ⓘ | |
| Sulfate | 16 | 0% | Moderate | Low | |
| Uranium | 4 | 0% | Low | Low ⓘ | |
| Hardness | 18 | — | Moderate | Low | |
| PFBS ⓘ municipal | 10 | — | Low | Low | |
| pH | 22 | — | Moderate | Low | |
| Sodium | 15 | — | Moderate | 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.
Loading recent water news…