Well owners in Hamilton County need to know about iron, manganese, nitrate, fluoride, and lead in their groundwater. Several of these contaminants exceed EPA health standards, so testing your well is important.
These contaminants come from the rocks below and from human activity above ground. Iron and manganese occur naturally when water sits in contact with certain rock types. Nitrate usually enters groundwater from fertilizers and septic systems. Fluoride comes from the local rock minerals. Lead can leach from pipes and fixtures in older systems.
Groundwater in this county is notably high in iron, which comes from the bedrock dissolving slowly into the water over time. Since the aquifer is made of mixed rock types, iron concentration varies from well to well in this area. Many wells in Hamilton County show elevated iron levels.
Wells in Hamilton County have been found with fluoride, iron, lead, manganese, and nitrate at levels above EPA health standards. Fluoride at elevated levels can cause dental fluorosis, a condition that affects tooth development in children. Lead exposure is especially harmful to young children and can affect brain development and learning. Nitrate can be dangerous for infants and pregnant women, interfering with how the body carries oxygen. Manganese at high levels may affect the nervous system with long-term exposure.
Iron and manganese in county well water create orange or brown staining on fixtures, laundry, and dishes. These minerals can leave a metallic taste in your water and cause your washing machine or dishwasher to work less effectively over time. Water heaters and appliances may wear out faster when dealing with elevated iron and manganese levels.
We recommend testing your well water to find out exactly what is in it, since every well is different and yours may have higher or lower levels than others in the county. A comprehensive metals and minerals panel typically costs between $200 and $400 and will tell you what needs treatment. Testing is the only way to know what should be filtered or removed from your specific well, and treatment options like iron filters or reverse osmosis systems can address multiple concerns.
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 | 91 | 31% | Moderate | High | |
| Nitrate | 13 | 8% | Low | Moderate | |
| Manganese | 72 | 6% | Moderate | Moderate | |
| Lead | 47 | 2% | Moderate | Low | |
| Fluoride | 201 | 2% | High | Low | |
| Arsenic | 47 | 0% | Moderate | Low | |
| Uranium | 12 | 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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