Groundwater in Grayson County contains radon, manganese, and arsenic. Manganese and radon exceed EPA health standards in this area, making them the primary concerns for well owners.
These contaminants come from the rock layers beneath the county. Manganese and arsenic occur naturally when groundwater passes through certain minerals in the Valley and Ridge rocks. Radon seeps into groundwater from uranium that breaks down in the bedrock and soil above the water table.
Groundwater in this county is soft, with moderate iron being the main mineral character. The bedrock here does not contain large amounts of limestone or other minerals that would make water hard. Iron and manganese levels are elevated enough to be noticeable across many wells in the county.
Wells in Grayson County sometimes contain manganese and radon at levels that exceed EPA health standards. Manganese is a metal that can affect the brain and nervous system, especially in children and babies. Radon is a radioactive gas that enters water from rock underground and increases the risk of cancer when you drink it over time.
The good news is that Grayson County wells are soft with low mineral content overall. You should not see much staining, scale buildup, or taste problems from minerals in your water. Your appliances like water heaters should not wear out faster than normal.
We recommend getting your well tested to find out what is actually in your water. Your well could have higher or lower levels than what is common in the county--testing is the only way to know for sure. A comprehensive panel checking for metals and minerals runs about $200 to $400 and will tell you exactly what you are dealing with. Treatment options like activated carbon filters or aeration systems can address these specific concerns once you know your results.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Nitrite | 5 | 0% | Low | Safe ⓘ | |
| Sulfate | 5 | 0% | Low | Low ⓘ | |
| Uranium | 5 | 0% | Low | Low ⓘ | |
| Arsenic | 5 | 0% | Low | Safe ⓘ | |
| Chloride | 5 | 0% | Low | Low ⓘ | |
| Fluoride | 5 | 0% | Low | Low ⓘ | |
| Iron | 5 | 0% | Low | Low ⓘ | |
| Lead | 5 | 0% | Low | Low ⓘ | |
| Manganese | 5 | 0% | Low | Safe ⓘ | |
| Nitrate | 5 | 0% | Low | Low ⓘ | |
| Radon | 5 | 0% | Low | Low ⓘ | |
| Arsenic | 5 | 0% | Low | Safe ⓘ | |
| Chloride | 5 | 0% | Low | Low ⓘ | |
| Fluoride | 5 | 0% | Low | Low ⓘ | |
| Iron | 5 | 0% | Low | Low ⓘ | |
| Lead | 5 | 0% | Low | Low ⓘ | |
| Manganese | 5 | 0% | Low | Safe ⓘ | |
| Nitrate | 5 | 0% | Low | Low ⓘ | |
| Nitrite | 5 | 0% | Low | Safe ⓘ | |
| Radon | 5 | 0% | Low | Low ⓘ | |
| Sulfate | 5 | 0% | Low | Low ⓘ | |
| Uranium | 5 | 0% | Low | Low ⓘ | |
| Hardness | 5 | — | Low | Low ⓘ | |
| pH | 5 | — | Low | Low ⓘ | |
| Sodium | 5 | — | 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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