Groundwater in Oldham County contains iron, manganese, arsenic, and fluoride at levels that exceed health standards set by the EPA. These contaminants are present at concerning levels and warrant attention from well owners.
The High Plains aquifer here sits above and within rock layers that naturally contain these metals and minerals. Iron and manganese dissolve into groundwater where oxygen is low in the aquifer. Arsenic and fluoride occur naturally in the rock itself and leach into water over time. All four contaminants are common across the region because they come from the rocks the water passes through, not from pollution nearby.
Groundwater in this county is hard, driven by elevated calcium and magnesium that dissolve from the rock layer. The water also carries moderate amounts of iron from the aquifer material. Hard water and elevated iron are widespread across wells in Oldham County because of the mineral-rich rock that makes up the High Plains aquifer in this area.
Wells in Oldham County have been found to contain arsenic, fluoride, iron, and manganese at levels that exceed EPA health standards. Arsenic can cause skin problems, increases cancer risk, and affects the nervous system with long-term exposure. Fluoride at high levels can damage teeth and bones. Iron and manganese in drinking water can affect the nervous system, especially in children, and may cause other health concerns over time.
The hard water in county wells can leave stains on sinks, tubs, and clothing that are difficult to remove. You may notice buildup of scale inside pipes, on faucets, and inside appliances like kettles and coffee makers. Hard water can shorten the lifespan of water heaters and dishwashers. Some people also notice a metallic taste in the water.
We recommend testing your well water with a comprehensive panel since multiple analytes exceed standards in this county. Every well is different, and your water could have higher or lower levels than what is common here. Testing is the only way to know what is actually in your well so you can treat it properly. A comprehensive metals and minerals test typically costs between two hundred and four hundred dollars. Treatment options like reverse osmosis or ion exchange 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 | 72 | 21% | Moderate | High | |
| Manganese | 71 | 6% | Moderate | Moderate | |
| Arsenic | 56 | 2% | Moderate | Low | |
| Fluoride | 156 | 1% | High | Low | |
| Chloride | 1 | 0% | Low | Low ⓘ | |
| Lead | 56 | 0% | Moderate | Low | |
| Nitrate | 9 | 0% | Low | Low ⓘ | |
| Nitrite | 1 | 0% | Low | Safe ⓘ | |
| Radon | 1 | 0% | Low | Low ⓘ | |
| Sulfate | 1 | 0% | Low | Low ⓘ | |
| Uranium | 6 | 0% | Low | Low ⓘ | |
| Hardness | 1 | — | Low | Low ⓘ | |
| pH | 1 | — | Low | 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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