Groundwater in Racine County contains iron, radon, chloride, sulfate, and arsenic. Several of these contaminants exceed EPA health standards, making testing and treatment important for well owners.
These contaminants come from the rock layers beneath the county. Iron, sulfate, and arsenic dissolve naturally as groundwater moves slowly through the Silurian-Devonian rock formation in low-oxygen conditions deep underground. Chloride enters from road salt applied during winter months. Radon comes from natural radioactive decay within the rock itself.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the limestone and rock below. The same rock layers that release iron and other metals also contribute to this extreme hardness. These characteristics are common across wells throughout the county.
Wells in Racine County commonly contain chloride, sulfate, iron, arsenic, and radon at levels that exceed EPA health standards. Arsenic is colorless and odorless, so you cannot detect it without testing--long-term exposure can increase the risk of cancer and organ damage. Radon is a radioactive gas that enters water from natural decay in rock; breathing radon released from water during showers and daily use increases lung cancer risk. Iron and sulfate at elevated levels can cause digestive problems in some people.
The water in this county is very hard, and the mineral content creates everyday challenges. Hard water leaves white scale buildup on faucets, fixtures, and inside pipes and appliances. The iron causes rust-colored staining on sinks, tubs, and laundry. High sulfate gives the water a bitter or unpleasant taste. This extreme hardness can shorten the lifespan of water heaters, dishwashers, and other appliances.
We recommend testing your well water with a comprehensive metals and minerals panel, which typically costs $200-400. Every well in this county is different, and your well may have higher or lower levels than what is common here--testing is the only way to know what is actually in your water so it can be properly treated. Treatment options include systems combining arsenic removal, radon ventilation, iron removal, and water softening.
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 | 83 | 53% | Moderate | High | |
| Sulfate | 75 | 16% | Moderate | High | |
| Manganese | 69 | 14% | Moderate | Moderate | |
| Arsenic | 15 | 7% | Moderate | Moderate | |
| Chloride | 78 | 1% | Moderate | Low | |
| Fluoride | 59 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 40 | 0% | Moderate | Safe | |
| Lead | 15 | 0% | Moderate | Low | |
| Nitrate | 55 | 0% | Moderate | Low | |
| Nitrite | 40 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 40 | 0% | Moderate | Low | |
| PFNA ⓘ municipal | 40 | 0% | Moderate | Low | |
| PFOA ⓘ municipal | 40 | 0% | Moderate | Low | |
| PFOS ⓘ municipal | 40 | 0% | Moderate | Low | |
| Radon | 9 | 0% | Low | Low ⓘ | |
| Uranium | 13 | 0% | Low | Low | |
| Hardness | 83 | — | Moderate | Low | |
| PFBS ⓘ municipal | 40 | — | Moderate | Low | |
| pH | 86 | — | Moderate | Low | |
| Sodium | 62 | — | 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.
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