Groundwater in Grant County contains sulfate, arsenic, and chloride. Sulfate exceeds the EPA health standard, while arsenic and chloride are present at levels that warrant awareness.
These contaminants come from the deep rock layers beneath the county. As water moves slowly through limestone and sandstone over many years, it dissolves minerals and naturally occurring elements from the rock itself. Sulfate, arsenic, and chloride all occur naturally in these ancient stone formations.
Groundwater in Grant County is very hard, driven by elevated calcium and magnesium from the limestone below. As water percolates through the limestone, it picks up these minerals that make water hard. Very hard water is widespread across wells in this county.
Sulfate is the main concern in Grant County wells that exceeds EPA health standards. Exposure to high sulfate in drinking water can cause digestive problems, especially for infants and people with sensitive systems. Arsenic and chloride are also found in county groundwater, though at lower levels. It's important to know whether your specific well has any of these contaminants.
Wells in this county have very hard water, which causes white scale buildup on pipes, faucets, and inside appliances like kettles and coffee makers. Hard water can shorten the lifespan of water heaters and dishwashers over time. You may also notice that soap doesn't lather as well as it should. Despite the hardness, sodium levels in county wells are low, which is good news for your health.
We recommend testing your well water to find out exactly what it contains, since every well is different and yours may have higher or lower levels than what's common in the county. A basic screening test costs fifty to one hundred dollars, while a comprehensive metals and minerals panel runs two hundred to four hundred dollars. Testing is the only way to know what treatment your well actually needs, whether that's a water softener for hardness or other targeted solutions.
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 | 135 | 28% | High | High | |
| Manganese | 136 | 8% | High | Moderate | |
| Nitrate | 87 | 6% | Moderate | Moderate | |
| Sulfate | 132 | 5% | High |
Moderate
Elevated concentration, not % above limit
|
|
| Arsenic | 24 | 0% | Moderate | Low | |
| Chloride | 130 | 0% | High | Low | |
| Fluoride | 116 | 0% | High | Low | |
| HFPO-DA (GenX) ⓘ municipal | 20 | 0% | Moderate | Safe | |
| Lead | 24 | 0% | Moderate | Low | |
| Nitrite | 64 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 20 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 20 | 0% | Moderate | Low | |
| PFOA ⓘ municipal | 20 | 0% | Moderate | Low | |
| PFOS ⓘ municipal | 20 | 0% | Moderate | Safe | |
| Radon | 1 | 0% | Low | Low ⓘ | |
| Uranium | 17 | 0% | Moderate | Low | |
| Hardness | 137 | — | High | Low | |
| PFBS ⓘ municipal | 20 | — | Moderate | Low | |
| pH | 131 | — | High | Low | |
| Sodium | 71 | — | Moderate | 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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