Groundwater in Warren County contains manganese, arsenic, and chloride at levels that exceed EPA health standards. These contaminants are present at concentrations serious enough that well owners should test their water and consider treatment options.
These metals and salts come from the rock layers beneath the county. Manganese and arsenic occur naturally in the non-carbonate rock of the Valley and Ridge, while chloride can seep in from road salt, agricultural practices, and natural mineral deposits in the deeper bedrock. The movement of groundwater through these rock layers dissolves and carries these elements into private wells.
Groundwater in this county is moderately hard, driven by calcium and magnesium from the limestone and rock formations underground. This moderate hardness is typical across wells in Warren County because the local bedrock consistently releases these minerals into the water as it flows through.
Wells in Warren County have been found to contain arsenic, chloride, and manganese at levels that exceed EPA health standards. Arsenic can damage your kidneys and bones and increase cancer risk over many years of drinking contaminated water. Manganese at high levels can affect your brain and nervous system, especially in children. Chloride at elevated levels raises health concerns for people who need to watch their salt intake, including those with high blood pressure or heart disease.
The moderately hard water in county wells can leave spots on dishes and glasses after washing, and may cause buildup of scale inside pipes and appliances. While the iron and sodium levels here are low, the mineral content can affect how soap works and may leave residue on skin and hair. You might notice a slight taste or feel to the water from these minerals.
We recommend having your well tested to find out exactly what is in your water. Every well is different, and your water could have higher or lower levels than what is common in the county. Testing is the only way to know what you are actually drinking so it can be properly treated. We suggest a comprehensive testing panel since multiple contaminants exceed health standards in this area. Treatment options like reverse osmosis or activated carbon filters can help reduce arsenic and other concerns.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Arsenic | 1 | 0% | Low | Low ⓘ | |
| Chloride | 1 | 0% | Low | Low ⓘ | |
| Fluoride | 1 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| Iron | 1 | 0% | Low | Safe ⓘ | |
| Lead | 1 | 0% | Low | Safe ⓘ | |
| Manganese | 1 | 0% | Low | Safe ⓘ | |
| PFHxS ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| Radon | 1 | 0% | Low | Low ⓘ | |
| Sulfate | 1 | 0% | Low | Low ⓘ | |
| Uranium | 1 | 0% | Low | Low ⓘ | |
| Hardness | 1 | — | Low | Low ⓘ | |
| PFBS ⓘ municipal | 4 | — | Low | Safe ⓘ | |
| pH | 43 | — | Moderate | Low | |
| Sodium | 1 | — | 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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