Groundwater in Hardin County contains arsenic, iron, lead, manganese, and sulfate at levels that exceed EPA health standards. These contaminant levels are serious concerns that require testing and treatment.
The bedrock beneath Hardin County naturally contains iron-bearing minerals and sulfate-rich deposits that dissolve into groundwater as it moves slowly through cracks in the rock. Arsenic and lead sit locked within the rock layers themselves, released into water through long contact with the stone. These contaminants are not from pollution--they come straight from the geology.
Groundwater in this county is very hard, with elevated calcium and magnesium, and contains notable concentrations of iron and sulfate that give the water distinct characteristics. The limestone and other rock layers dissolve these minerals naturally as water passes through over time. These hard-water and mineral characteristics are widespread across wells throughout Hardin County.
Wells in Hardin County commonly contain arsenic, iron, lead, manganese, and sulfate at levels exceeding EPA health standards. Arsenic is colorless and tasteless, making it impossible to detect without testing--long-term exposure increases the risk of cancer and organ damage. Iron and lead can harm your health over time, while manganese at elevated levels may affect brain development and nervous system function. Sulfate at high concentrations can cause digestive problems, particularly in infants and people with sensitive systems.
The mineral content in county wells creates noticeable quality-of-life problems. The water here is extremely hard, leaving thick white crusty buildup on fixtures and shortening the lifespan of water heaters and dishwashers. Iron causes orange-brown or rust-colored staining on sinks, toilets, and laundry. High sulfate levels can give the water a bitter taste or rotten-egg smell, and elevated sodium makes the water taste salty.
We recommend testing your well right away since every well is different and yours may have higher or lower levels than what is typical in the county. Testing is the only way to know exactly what is in your water so it can be properly treated. We recommend a comprehensive metals and minerals panel, which typically costs $200-400. Treatment options include a water softener combined with an iron filter and arsenic-removal system.
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 | 58 | 76% | Moderate | High | |
| Sulfate | 4 | 25% | Low | High ⓘ | |
| Manganese | 45 | 13% | Moderate | Moderate | |
| Arsenic | 42 | 2% | Moderate | Low | |
| Lead | 43 | 2% | Moderate | Low | |
| Chloride | 57 | 0% | Moderate | Low | |
| Fluoride | 34 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| Nitrate | 19 | 0% | Moderate | Low | |
| Nitrite | 7 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 4 | 0% | Low | Safe ⓘ | |
| Radon | 1 | 0% | Low | Low ⓘ | |
| Sodium | 59 | — | Moderate | Low | |
| pH | 55 | — | Moderate | Low | |
| PFBS ⓘ municipal | 4 | — | Low | Safe ⓘ | |
| Hardness | 36 | — | 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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