Groundwater in DeWitt County contains radon, chloride, iron, arsenic, fluoride, and manganese at levels that exceed EPA health standards. These contaminant levels are concerning and warrant testing and treatment consideration.
The coastal lowlands geology here naturally contains these metals and minerals in the rock and sediment layers. Chloride and saltwater seep upward from deeper formations into the shallower water that wells draw from. Radon comes from natural radioactive decay in the rocks below.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the rock layers beneath. Sodium is also notably high in the water. These mineral-rich conditions are common across wells throughout the county.
Wells in DeWitt County can contain arsenic, chloride, fluoride, iron, manganese, and radon at levels above EPA health standards. Arsenic exposure over time can harm your kidneys and increase cancer risk. Fluoride at elevated levels can damage tooth enamel, especially in children. Manganese can affect your nervous system. Radon is a radioactive gas that increases lung cancer risk when breathed in over years. Chloride at high levels poses risks to people with heart or kidney problems.
The water in this county is very hard, which causes white crusty scale buildup inside pipes and appliances. You may notice rust or brown staining on fixtures and laundry from iron and manganese. The water can taste salty or metallic. Very hard water shortens the lifespan of water heaters, dishwashers, and other appliances by forcing them to work harder.
Since several contaminants exceed health standards in county wells, we recommend a comprehensive metals and minerals panel to learn what is actually in your well. Every well is different, and your water may have higher or lower levels than what is common here. Testing is the only way to know what needs treatment. Depending on your results, options like arsenic filters, iron removal systems, or radon mitigation can help protect your family.
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 ⓘ |
|---|---|---|---|---|---|
| Radon | 1 | 100% | Low | High ⓘ | |
| Chloride | 14 | 21% | Low | High | |
| Iron | 92 | 16% | Moderate | High | |
| Manganese | 62 | 8% | Moderate | Moderate | |
| Arsenic | 62 | 2% | Moderate | Low | |
| Fluoride | 230 | 0% | High | Low | |
| HFPO-DA (GenX) ⓘ municipal | 10 | 0% | Low | Safe | |
| Lead | 62 | 0% | Moderate | Low | |
| Nitrate | 24 | 0% | Moderate | Low | |
| Nitrite | 14 | 0% | Low | Safe | |
| PFHxS ⓘ municipal | 10 | 0% | Low | Safe | |
| PFNA ⓘ municipal | 10 | 0% | Low | Safe | |
| PFOA ⓘ municipal | 10 | 0% | Low | Safe | |
| PFOS ⓘ municipal | 10 | 0% | Low | Safe | |
| Sulfate | 14 | 0% | Low | Low | |
| Uranium | 27 | 0% | Moderate | Low | |
| Sodium | 14 | — | Low | Low | |
| pH | 14 | — | Low | Low | |
| PFBS ⓘ municipal | 10 | — | Low | Safe | |
| Hardness | 14 | — | 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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