Groundwater in Armstrong County contains sulfate, radon, and chloride at levels that exceed EPA health standards. These contaminants are present in enough quantity to warrant attention from well owners.
The rock beneath Armstrong County naturally contains sulfur-bearing minerals that dissolve into groundwater as water slowly moves through fractures and cracks. Radon seeps from uranium traces scattered throughout the rock. Chloride accumulates in deeper groundwater from salt deposits that formed long ago.
Groundwater in this county is moderately hard, driven mainly by elevated sulfate. Sulfate forms when water contacts sulfur-bearing minerals in the Mississippian rock layers. This characteristic is widespread across wells throughout the county.
Wells in Armstrong County commonly show four contaminants that exceed EPA health standards: chloride, radon, perfluorooctanoic acid (PFOA), and sulfate. Chloride at elevated levels can affect kidney function and raise blood pressure concerns, especially for people on salt-restricted diets. Radon is a radioactive gas that seeps from rock and increases the risk of lung cancer with long-term exposure through inhalation. PFOA is a manufactured chemical linked to health effects including liver damage and immune system problems. Sulfate at high levels can cause digestive issues.
The mineral content in county wells creates noticeable quality-of-life impacts. Moderate sulfate levels give water a bitter or metallic taste. Iron at low levels in this county is less of a staining concern than in some areas, but you may still notice discoloration in sinks or laundry over time. Hard water can cause scale buildup on pipes and fixtures and may shorten the lifespan of water heaters and dishwashers.
We recommend testing your well water with a comprehensive metals and radon panel, which typically costs $200-400. 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 water so it can be properly treated. Ion exchange systems and radon aeration can help address multiple concerns identified through testing.
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.
Loading recent water news…