Groundwater in Armstrong County contains manganese, iron, sulfate, and several other contaminants that well owners should monitor. Several of these substances exceed EPA health standards, making testing and awareness important for your household.
These contaminants come from the Mississippian rock formations beneath the county. As groundwater moves slowly through cracks and tiny spaces in these ancient rocks, it dissolves minerals naturally present in the stone. Iron and manganese leach out under the low-oxygen conditions found deep underground. Sulfate accumulates as water contacts sulfur-bearing minerals in the rock layers.
Groundwater in this county is hard, driven by elevated iron and naturally occurring minerals from the bedrock below. Hard water and elevated iron are common characteristics across Armstrong County wells, though individual results vary. These mineral concentrations reflect the geological makeup of the Mississippian aquifer system throughout the region.
Wells in Armstrong County commonly contain radon, PFOA, arsenic, chloride, iron, and manganese at levels exceeding EPA health standards. Radon is a radioactive gas that can increase lung cancer risk when present in water over many years. Arsenic can harm organs and increase cancer risk with long-term exposure. Manganese can affect brain development and nervous system function, especially in children. PFOA is a human-made chemical linked to health problems at elevated levels.
County well water is hard, which means you may notice orange-brown stains on sinks, toilets, and laundry from iron. White scale buildup can form on pipes, fixtures, and inside water heaters and dishwashers. Hard water can shorten the lifespan of appliances like water heaters and dishwashers. The sulfate in the water may give it a bitter or unpleasant taste.
We recommend testing your well water with a comprehensive metals and radon panel, since multiple contaminants exceed health standards. Every well is different, and your well may have higher or lower levels than what is common in the county. Testing is the only way to know what is actually in your well so it can be properly treated. A comprehensive panel typically costs $200-400 and can guide treatment decisions such as aeration systems, activated carbon filters, or water softeners.
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 ⓘ |
|---|---|---|---|---|---|
| Manganese | 10 | 90% | Low | High | |
| Iron | 11 | 64% | Low | High | |
| Sulfate | 11 | 36% | Low | High | |
| Radon | 6 | 17% | Low | High ⓘ | |
| Arsenic | 8 | 12% | Low | Moderate ⓘ | |
| Chloride | 11 | 9% | Low | Moderate | |
| PFOA ⓘ municipal | 57 | 2% | Moderate | Low | |
| Fluoride | 9 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 58 | 0% | Moderate | Safe | |
| Lead | 8 | 0% | Low | Low ⓘ | |
| Nitrate | 9 | 0% | Low | Low ⓘ | |
| Nitrite | 8 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 16 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 16 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 57 | 0% | Moderate | Low | |
| Uranium | 8 | 0% | Low | Low ⓘ | |
| Total Coliform | 1* | 0% | Low | Safe ⓘ | |
| Sodium | 8 | — | Low | Low ⓘ | |
| pH | 14 | — | Low | Low | |
| PFBS ⓘ municipal | 57 | — | Moderate | Low | |
| Hardness | 12 | — | Low | Low | |
| E. coli | 1* | 0% | Low | Safe ⓘ |
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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