Iron, manganese, sulfate, chloride, and radon are present in Seneca County's groundwater. Iron and manganese exceed EPA health standards, along with chloride, radon, and sulfate--levels that well owners should address.
The limestone bedrock beneath this county naturally contains iron and manganese that dissolve into water as it moves through the rock. Sulfate and chloride also come from the limestone and from road salt applied during winter. Radon enters from uranium decay in the rock itself.
Groundwater in this county is hard, driven by calcium and magnesium released from the limestone below, along with very high iron and moderate sulfate that give the water its mineral character. These minerals concentrate because water stays in contact with the limestone for a long time, allowing them to dissolve. Hard water with elevated iron and sulfate is a widespread condition across wells in Seneca County.
Seneca County wells commonly contain chloride, iron, manganese, radon, and sulfate at levels that exceed EPA health standards. Chloride at elevated concentrations can harm people with certain heart and kidney conditions. Radon is a radioactive gas that increases lung cancer risk when inhaled over time. Manganese can affect brain development and function, especially in children. Iron and sulfate at high levels can cause digestive issues in some people.
The hard water in this county creates visible staining on fixtures and dishes from iron and mineral deposits. You may notice a reddish or brown tint to your water, or a metallic taste and smell. Scale builds up inside pipes and reduces water flow over time. Hard water shortens the lifespan of water heaters and dishwashers. Soap doesn't lather well and leaves residue on skin and clothes.
Your well is unique and may have different contaminant levels than what is common here. Testing is the only way to know what is actually in your water and how to treat it properly. We recommend a comprehensive metals and minerals panel, which typically costs between $200 and $400. Treatment options include water softeners for hardness, radon aeration systems, and iron filters depending on what testing reveals.
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 | 3 | 100% | 33% · 0% · 67% | Low | High ⓘ |
| Manganese | 9 | 50% | 33% · 22% · 44% | Low | High ⓘ |
| Sulfate | 49 | 35% | 53% · 12% · 35% | Moderate | High |
| Radon | 9 | 11% | 56% · 33% · 11% | Low | Moderate ⓘ |
| Chloride | 56 | 4% | 88% · 9% · 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
| Fluoride | 4 | 0% | 75% · 25% · 0% | Low | Low ⓘ |
| Arsenic | 2 | 0% | 50% · 50% · 0% | Low | Low ⓘ |
| Uranium | 6 | 0% | 100% · 0% · 0% | Low | Low ⓘ |
| PFOA ⓘ municipal | 8 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| PFHxS ⓘ municipal | 8 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| HFPO-DA (GenX) ⓘ municipal | 8 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| PFOS ⓘ municipal | 8 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| PFNA ⓘ municipal | 8 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| PFBS ⓘ municipal | 8 | — | 100% · 0% · 0% | Low | Safe ⓘ |
| pH | 13 | — | — | Low | Low |
| Nitrate | 1 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| Sodium | 47 | — | — | Moderate | Low |
| Nitrite | 1 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| Lead | 1 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| E. coli | 1 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| Total Coliform | 1 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| Fecal Coliform | 1 | 0% | 100% · 0% · 0% | Low | Safe ⓘ |
| Hardness | 5 | — | — | 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.
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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