Groundwater in Lafayette County contains sulfate, arsenic, and chloride that well owners should know about. Sulfate levels exceed the EPA health standard, while arsenic and chloride are present at low levels.
Sulfate enters the groundwater as water moves slowly through the deep limestone and sandstone layers beneath the county. These rocks naturally contain sulfate minerals that dissolve into the water over time. Arsenic and chloride also come from the rock itself rather than from surface pollution or land use.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the limestone below. As water filters down through these carbonate rocks, it dissolves minerals that accumulate in the groundwater. Very hard water is the rule across wells in Lafayette County and the neighboring region.
Sulfate is found at levels above EPA health standards in wells across this county. Exposure to elevated sulfate in drinking water can cause digestive issues, especially in infants and young children. Some people experience diarrhea and other stomach problems from drinking water with high sulfate. Arsenic and chloride also appear in county groundwater at lower levels of concern.
Wells in this county have very hard water, which means there is a lot of dissolved minerals. Hard water leaves white scale buildup on faucets, showerheads, and inside pipes. It can shorten the lifespan of water heaters and dishwashers. You may notice that soap doesn't lather well and laundry feels stiff after washing.
Every well is different, and your water 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. We recommend a comprehensive water test that checks for metals and minerals, which costs between $200 and $400. Water softening systems can help address the hardness in your water.
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 | 100 | 35% | High | High | |
| Manganese | 93 | 8% | Moderate | Moderate | |
| Sulfate | 100 | 5% | High | Moderate | |
| Nitrate | 50 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Arsenic | 11 | 0% | Low | Low | |
| Chloride | 80 | 0% | Moderate | Low | |
| Fluoride | 68 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 10 | 0% | Low | Safe | |
| Lead | 27 | 0% | Moderate | Low | |
| Nitrite | 34 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 10 | 0% | Low | Safe | |
| PFNA ⓘ municipal | 10 | 0% | Low | Safe | |
| PFOA ⓘ municipal | 10 | 0% | Low | Low | |
| PFOS ⓘ municipal | 10 | 0% | Low | Safe | |
| Uranium | 1 | 0% | Low | Low ⓘ | |
| Hardness | 101 | — | High | Low | |
| PFBS ⓘ municipal | 10 | — | Low | Low | |
| pH | 96 | — | Moderate | Low | |
| Sodium | 34 | — | 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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