Well water in Warren County contains radon, manganese, and iron at elevated levels, with several additional contaminants exceeding EPA health standards. These levels are concerning enough to warrant testing and treatment for your well.
The mixed rock layers beneath Warren County naturally release these metals into groundwater as water moves slowly through cracks and spaces in the rock. Radon forms from radioactive decay within the bedrock itself, while iron and manganese dissolve directly from the surrounding minerals. Arsenic, lead, and sulfate also come from minerals embedded in these same rock formations.
Groundwater in Warren County is very hard, driven by high calcium and magnesium concentrations from the underlying rock. The same rock layers that create this hardness also release elevated iron. These characteristics are widespread across wells throughout the county, though every well varies in composition.
Wells in Warren County commonly exceed EPA health standards for arsenic, lead, radon, and PFOA/PFOS. Arsenic and lead are toxic metals that build up in your body over years and can cause cancer, organ damage, and neurological problems. Radon is a radioactive gas that increases lung cancer risk with long-term exposure. PFOA and PFOS are industrial chemicals linked to kidney and liver damage, immune system problems, and other serious health effects.
County wells also show very hard water with elevated iron and moderate sodium. The extreme hardness leaves thick white crusty buildup on faucets and pipes and reduces how well soap lathers. Iron causes orange or rust-colored stains on sinks, toilets, and laundry. Water heaters and dishwashers wear out faster in this hard water. The water may taste metallic or slightly salty.
We recommend testing your well because every well is different and yours 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. Since multiple contaminants exceed health standards, a comprehensive metals and minerals panel is recommended, which typically costs $200-400. Treatment options include reverse osmosis systems combined with radon aeration or whole-house filters designed to remove metals and PFOA/PFOS.
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 | 115 | 61% | High | High | |
| Manganese | 102 | 55% | High | High | |
| PFOS ⓘ municipal | 32 | 28% | Moderate | High | |
| Arsenic | 104 | 25% | High | High | |
| Radon | 6 | 17% | Low | High ⓘ | |
| PFOA ⓘ municipal | 32 | 6% | Moderate | Moderate | |
| Lead | 99 | 1% | Moderate | Low | |
| Chloride | 118 | 0% | High | Low | |
| Fluoride | 57 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 32 | 0% | Moderate | Safe | |
| Nitrate | 39 | 0% | Moderate | Low | |
| Nitrite | 22 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 32 | 0% | Moderate | Low | |
| PFNA ⓘ municipal | 32 | 0% | Moderate | Safe | |
| Sulfate | 24 | 0% | Moderate | Low | |
| Uranium | 13 | 0% | Low | Low | |
| pH | 94 | — | Moderate | Low | |
| Sodium | 116 | — | High | Low | |
| Total Coliform | 2* | 0% | Low | Low ⓘ | |
| E. coli | 2* | 0% | Low | Safe ⓘ | |
| Hardness | 100 | — | High | Low | |
| PFBS ⓘ municipal | 32 | — | 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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