Arsenic, chloride, and E. coli are present in Alleghany County groundwater that well owners should be aware of. The levels of these contaminants are low and do not exceed EPA health standards.
Arsenic and chloride occur naturally in the crystalline rock that makes up the county's aquifers. The rock in this area has been shaped by ancient geological processes that concentrated these minerals in the groundwater. E. coli comes from surface contamination near wells, often from septic systems or animal waste in the soil above the aquifer.
Groundwater in this county is soft and contains very low amounts of iron, sodium, and sulfate. The crystalline rock here does not weather easily or dissolve minerals the way softer rock does, so fewer minerals end up in the water. Most wells in Alleghany County show this same soft-water character across the region.
Wells in Alleghany County have not been found to exceed EPA health standards as a group. However, arsenic, chloride, and bacteria are contaminants of concern that appear in some county wells at levels below current health limits. Arsenic can damage organs over time with long-term exposure. Chloride at high levels may affect people with certain health conditions. Bacteria in well water can cause serious illness.
The good news is that wells in this county tend to have soft water with low mineral content. You probably won't notice staining from iron or taste problems from minerals. Your water heater and dishwasher should last a normal lifespan. The mineral profile here is generally not a quality-of-life concern.
We recommend testing your well to find out exactly what is in your water. Every well is different, and your water could have higher or lower levels of these contaminants than what is common in the county. Testing is the only way to know what you are drinking so you can treat it properly if needed. A basic screening for bacteria and nitrate runs fifty to one hundred dollars, or you can get a comprehensive metals and minerals panel for two hundred to four hundred dollars. Treatment options like chlorination or activated carbon filters can address many of these concerns.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Arsenic | 4 | 0% | Low | Safe ⓘ | |
| Chloride | 4 | 0% | Low | Low ⓘ | |
| Fluoride | 4 | 0% | Low | Low ⓘ | |
| Iron | 4 | 0% | Low | Low ⓘ | |
| Lead | 4 | 0% | Low | Safe ⓘ | |
| Manganese | 4 | 0% | Low | Low ⓘ | |
| Nitrate | 4 | 0% | Low | Low ⓘ | |
| Nitrite | 4 | 0% | Low | Safe ⓘ | |
| Radon | 4 | 0% | Low | Low ⓘ | |
| Sulfate | 4 | 0% | Low | Low ⓘ | |
| Uranium | 4 | 0% | Low | Low ⓘ | |
| Sodium | 4 | — | Low | Low ⓘ | |
| pH | 4 | — | Low | Low ⓘ | |
| Hardness | 4 | — | 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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