Groundwater in Allen County contains sulfate, iron, and manganese that well owners should be aware of. Sulfate levels are very high, while iron and manganese exceed EPA health standards, making these contaminants a serious concern.
These contaminants come from the rock layers beneath the county. The bedrock here contains iron-bearing minerals and sulfate-rich deposits that dissolve slowly as groundwater moves through cracks and fractures in the stone. This is natural geology, not pollution.
Groundwater in this county is very hard, driven by elevated calcium and magnesium, and also carries high sulfate. The same slow-moving groundwater that picks up hardness minerals also dissolves iron and manganese from the rock over time. These characteristics are widespread across wells throughout Allen County.
Three analytes exceed EPA health standards in wells across Allen County: iron, manganese, and sulfate. Iron can cause digestive problems and may interfere with how your body absorbs nutrients. Manganese at elevated levels raises concerns about brain and nerve function. Sulfate at high concentrations can cause digestive issues and may affect people with compromised immune systems.
Wells in this county are extremely hard, which means you will see thick white, crusty buildup on fixtures, faucets, and inside pipes. The high iron content stains sinks, toilets, and laundry orange or rust-colored. Sulfate can give water a bitter or unpleasant taste. Extreme hardness like this shortens the lifespan of water heaters, dishwashers, and other appliances.
We recommend testing your well because every well is different and yours 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 water so it can be properly treated. Since multiple analytes exceed standards here, a comprehensive metals and minerals panel is recommended and typically costs $200-400. Treatment options include a water softener combined with an iron 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 ⓘ |
|---|---|---|---|---|---|
| Sulfate | 19 | 84% | Moderate | High | |
| Iron | 57 | 46% | Moderate | High | |
| Manganese | 54 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Arsenic | 55 | 0% | Moderate | Low | |
| Chloride | 61 | 0% | Moderate | Low | |
| Fluoride | 45 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 15 | 0% | Moderate | Safe | |
| Lead | 50 | 0% | Moderate | Low | |
| Nitrite | 15 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 15 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 15 | 0% | Moderate | Safe | |
| PFOA ⓘ municipal | 15 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 15 | 0% | Moderate | Safe | |
| Nitrate | 14 | 0% | Low | Low | |
| pH | 57 | — | Moderate | Low | |
| PFBS ⓘ municipal | 15 | — | Moderate | Low | |
| Sodium | 57 | — | Moderate | Low | |
| Hardness | 48 | — | 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.
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