Groundwater in Warren County contains iron, radon, and PFOS at levels that exceed EPA health standards. These are moderate to elevated concerns that warrant attention from well owners in this area.
The rock beneath Warren County is crystalline and very old, lacking the porous spaces that collect water easily. Iron comes naturally from the breakdown of minerals in this hard rock, radon is a radioactive gas that seeps up from deep within the rock, and PFOS likely enters groundwater from industrial or commercial activities on the land surface that have seeped downward over time.
Groundwater in Warren County is soft and carries moderate amounts of iron. The crystalline rock here does not dissolve easily, so it does not add calcium and magnesium the way softer rock does, which keeps the water from becoming hard. Iron from the rock minerals is present across many wells in this county.
Wells in Warren County show iron, PFOS, and radon at levels that exceed EPA health standards. Iron in high amounts can cause problems with blood and organ function over time. PFOS is a manufactured chemical that builds up in your body and can affect your immune system and liver. Radon is a radioactive gas that increases your risk of lung cancer when you breathe it in over many years.
The moderate iron levels found in county wells can stain your clothes, dishes, and sink orange or brown. You might notice a metallic taste in your water or see rust-colored buildup in pipes and toilets. The good news is that Warren County wells are soft, which means you won't have heavy scale buildup or need expensive water softeners to handle hardness.
We recommend testing your well to find out what is actually in your water, since every well is different and yours could have higher or lower levels than the county average. A comprehensive panel that checks for metals, PFOS, radon, and bacteria costs between two hundred and four hundred dollars. Testing is the only way to know what treatment your well needs, whether that is an iron filter, carbon filter, or radon removal system.
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 ⓘ |
|---|---|---|---|---|---|
| PFOS ⓘ municipal | 4 | 75% | Low | High ⓘ | |
| Radon | 2 | 50% | Low | High ⓘ | |
| Iron | 18 | 22% | Moderate | High | |
| Nitrate | 18 | 6% | Moderate | Moderate | |
| Arsenic | 2 | 0% | Low | Low ⓘ | |
| Chloride | 18 | 0% | Moderate | Low | |
| Fluoride | 18 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| Lead | 2 | 0% | Low | Low ⓘ | |
| Manganese | 18 | 0% | Moderate | Low | |
| Nitrite | 2 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| Sulfate | 18 | 0% | Moderate | Low | |
| Uranium | 2 | 0% | Low | Low ⓘ | |
| Hardness | 18 | — | Moderate | Low | |
| PFBS ⓘ municipal | 4 | — | Low | Safe ⓘ | |
| pH | 18 | — | Moderate | Low | |
| Sodium | 18 | — | 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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