Crawford County's groundwater contains iron, arsenic, chloride, and sulfate. Several of these contaminants exceed EPA health standards, making testing and awareness important for well owners in this area.
These contaminants come from the deep rock layers beneath the county. As water filters slowly through limestone and sandstone far underground, it dissolves minerals and naturally occurring elements like iron and arsenic. Chloride and sulfate also occur in these rock formations and enter the groundwater through the same process.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the limestone below. Water moving through limestone for many years picks up these minerals, and the deep aquifer system here means water stays in contact with rock long enough to dissolve significant amounts. Very hard water is widespread across wells in Crawford County.
Arsenic, chloride, iron, and sulfate appear at levels exceeding EPA health standards in county wells. Arsenic is a concern because long-term exposure through drinking water can cause serious health problems. Chloride at elevated levels can affect the kidneys and heart, especially for people on restricted sodium diets. Iron itself is not a direct health risk at the levels found here, but it indicates the conditions that allow other contaminants to enter groundwater.
County wells have very hard water, which means dissolved minerals leave chalky scale buildup on pipes, fixtures, and inside water heaters and dishwashers. This buildup can shorten the lifespan of these appliances. You may notice orange or brown staining on sinks, toilets, and laundry from iron in the water. Hard water also makes it harder to get soap to lather and can leave a dry feeling on skin and hair.
Testing is the only way to know what is actually in your well, since every well is different and your water could have higher or lower levels than what is common in the county. We recommend a comprehensive metals and minerals panel to check all the contaminants of concern in this area, which typically costs between two hundred and four hundred dollars. Iron filters and water softeners can address many of these issues once you know your specific results.
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 | 55 | 33% | Moderate | High | |
| Nitrate | 45 | 16% | Moderate | High | |
| PFOS ⓘ municipal | 7 | 14% | Low | Moderate ⓘ | |
| Manganese | 50 | 12% | Moderate | Moderate | |
| Sulfate | 55 | 11% | Moderate | Moderate | |
| Chloride | 56 | 11% | Moderate | Moderate | |
| Uranium | 1 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 7 | 0% | Low | Low ⓘ | |
| PFNA ⓘ municipal | 7 | 0% | Low | Safe ⓘ | |
| PFHxS ⓘ municipal | 7 | 0% | Low | Low ⓘ | |
| Nitrite | 10 | 0% | Low | Low | |
| Lead | 3 | 0% | Low | Safe ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 7 | 0% | Low | Safe ⓘ | |
| Fluoride | 46 | 0% | Moderate | Low | |
| Arsenic | 3 | 0% | Low | Low ⓘ | |
| Sodium | 38 | — | Moderate | Low | |
| pH | 57 | — | Moderate | Low | |
| PFBS ⓘ municipal | 7 | — | Low | Safe ⓘ | |
| Hardness | 56 | — | 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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