Groundwater in Oneida County contains arsenic, chloride, iron, lead, radon, and sulfate at levels that exceed EPA health standards. These contaminants are present at concerning levels that require attention from well owners.
The limestone bedrock beneath this county naturally contains arsenic and uranium, which dissolve into groundwater as water moves through cracks and spaces in the rock. Radon forms from radioactive decay of elements in the limestone and seeps into water underground. Iron leaches from minerals in the carbonate rock. Chloride and sulfate can enter from both natural dissolution of rock minerals and from road salt and agricultural runoff on the surface.
Groundwater in this county is moderately hard, driven by calcium and magnesium that dissolve from the limestone bedrock. As water filters through the carbonate rock, these minerals accumulate naturally in the water. Moderate iron is also present in most wells across the county due to the composition of the underlying rock.
Arsenic, lead, and radon are contaminants found at concerning levels in wells across Oneida County. Arsenic damages organs over time and increases cancer risk. Lead harms brain development in children and damages kidneys and the nervous system in adults. Radon is a radioactive gas that enters lungs and causes lung cancer when breathed in over years. Chloride and sulfate also exceed health standards in some county wells and can affect those with certain health conditions.
Iron in county well water causes orange or brown staining on fixtures, laundry, and dishes. The moderately hard water here leaves scale buildup in pipes and on appliances, which can shorten the life of water heaters and dishwashers. Some people notice a metallic taste or slight odor from these minerals. These issues are frustrating but separate from the health concerns above.
We recommend testing your well as soon as possible. Your well may have higher or lower levels than what is common in the county, and testing is the only way to know what is actually there so it can be treated properly. A comprehensive metals and minerals panel that checks for arsenic, lead, radon, and other contaminants typically costs $200-400. Treatment options like radon aeration systems and arsenic removal filters can address these problems once you know your results.
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 | 105 | 40% | High | High | |
| Manganese | 98 | 37% | Moderate | High | |
| Radon | 41 | 22% | Moderate | High ⓘ | |
| Arsenic | 52 | 8% | Moderate | Moderate | |
| Sulfate | 106 | 5% | High |
Moderate
Elevated concentration, not % above limit
|
|
| Chloride | 105 | 3% | High | Low | |
| Nitrate | 88 | 1% | Moderate | Low | |
| Fluoride | 101 | 0% | High | Low | |
| HFPO-DA (GenX) ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| Lead | 52 | 0% | Moderate | Low | |
| Nitrite | 56 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| Uranium | 36 | 0% | Moderate | Low | |
| E. coli | 13* | 0% | Low | Low | |
| Fecal Coliform | 13* | 0% | Low | Low | |
| Hardness | 106 | — | High | Low | |
| PFBS ⓘ municipal | 8 | — | Low | Safe ⓘ | |
| pH | 107 | — | High | Low | |
| Sodium | 91 | — | Moderate | Low | |
| Total Coliform | 13* | 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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