Warren County's groundwater contains radon, iron, and PFOA at levels that exceed EPA health standards. Iron reaches moderate concentrations, while radon and PFOA pose health concerns that warrant testing and possible treatment.
Radon comes from natural decay of uranium in the bedrock below. Iron occurs naturally in the carbonate and other rocks that supply your well. PFOA enters groundwater through land use--primarily from industrial discharge, firefighting foam at airports or military sites, and contaminated soil--and persists because it does not break down easily in water.
Groundwater in this county is soft with moderate iron as the main mineral characteristic. The carbonate bedrock releases iron as water passes through it over time. Iron appears in a significant share of wells across the county, making it a common feature of local water.
Wells in Warren County commonly have iron, lead, PFOA, and radon at levels above EPA health standards. Lead can damage the brain and nervous system, especially in children. Radon is a radioactive gas that increases lung cancer risk. PFOA is a human-made chemical linked to health problems with the liver, thyroid, and immune system. Iron itself does not pose a health risk but indicates other contaminants may be present in your water.
Because Warren County wells are soft, you will not see heavy mineral buildup or scale on fixtures and appliances. You also won't experience a salty taste or excessive hardness concerns. The moderate iron that appears in county wells can create rust-colored staining on laundry, sinks, and pipes if present in your water.
We recommend a comprehensive testing panel for your well, since multiple contaminants exceed health standards in this county. Every well is different, and your water may have higher or lower levels than what is common here. Testing is the only way to know what is actually in your well so you can treat it correctly. A comprehensive metals and minerals panel costs between $200 and $400. Treatment options like activated carbon filters or radon mitigation systems can address these concerns once testing reveals your specific situation.
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 ⓘ |
|---|---|---|---|---|---|
| Radon | 26 | 54% | Moderate | High ⓘ | |
| Iron | 36 | 17% | Moderate | High | |
| Manganese | 36 | 11% | Moderate | Moderate | |
| PFOA ⓘ municipal | 9 | 11% | Low | Moderate ⓘ | |
| Arsenic | 34 | 0% | Moderate | Low | |
| Chloride | 37 | 0% | Moderate | Low | |
| Fluoride | 37 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 9 | 0% | Low | Safe ⓘ | |
| Lead | 34 | 0% | Moderate | Low | |
| Nitrate | 37 | 0% | Moderate | Low | |
| Nitrite | 27 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 9 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 9 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 9 | 0% | Low | Safe ⓘ | |
| Sulfate | 37 | 0% | Moderate | Low | |
| Uranium | 26 | 0% | Moderate | Low | |
| E. coli | 10* | 0% | Low | Safe | |
| Fecal Coliform | 10* | 0% | Low | Safe | |
| Hardness | 37 | — | Moderate | Low | |
| PFBS ⓘ municipal | 9 | — | Low | Safe ⓘ | |
| pH | 37 | — | Moderate | Low | |
| Sodium | 37 | — | Moderate | Low | |
| Total Coliform | 10* | 0% | Low | 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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