Groundwater in Warren County contains arsenic, chloride, and bacteria that well owners should know about. None of these contaminants exceed EPA health standards in this county, so contamination levels here are low.
The Valley and Ridge rocks beneath Warren County naturally release small amounts of arsenic into groundwater as water moves through the stone. Chloride can seep in from road salt and septic systems, while bacteria enter from surface sources near wells. The local geology and land use keep overall contamination low enough that wells remain safe from these sources.
Water in this county is moderately hard and carries elevated sodium, driven by minerals in the rock and interaction with natural salt deposits. The Valley and Ridge geology here contains layers that release both hardness minerals and sodium into groundwater as water passes through. These mineral characteristics show up across most wells in the county.
Wells in Warren County show arsenic and bacteria as contaminants of concern, even though they are not exceeding EPA health standards across the county right now. Arsenic can build up in your body over many years and increase the risk of cancer and other serious illnesses. Bacteria like E. coli cause immediate sickness with symptoms like diarrhea and vomiting.
The water in this county tends to be moderately hard with elevated sodium. You might notice white crusty buildup on faucets and showerheads, or spots on dishes after washing. The sodium can affect the taste of your water. Hard water can make soap less effective and may shorten the lifespan of water heaters and dishwashers over time.
Every well is different, and your well may have higher or lower levels than what is common here. We recommend testing your well to find out exactly what is in it so you can treat it properly if needed. A basic test for bacteria and arsenic costs around fifty to one hundred dollars. Treatment options like activated carbon filters or reverse osmosis systems can address arsenic, while boiling water or disinfection handles bacteria 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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