Groundwater in St. Clair County contains manganese, iron, and chloride that well owners should know about. These contaminants exceed EPA health standards, making them a concern that deserves attention.
These metals come from the rock layers beneath the county. As groundwater moves slowly through the underground rocks, iron and manganese dissolve naturally from the stone itself. Chloride enters from road salt spread during winter months, which seeps down through the soil into the water below.
Groundwater in this county is notable for elevated iron and manganese from the rock formations underneath. The county's mixed rock types naturally contain these metals, and the slow movement of water through them allows these minerals to accumulate. These characteristics are common across wells throughout the county.
Wells in St. Clair County commonly contain chloride, iron, manganese, and sulfate at levels that exceed EPA health standards. Chloride at elevated levels can damage your kidneys and heart over time, especially if you have high blood pressure or heart disease. Iron and manganese can harm brain development in children and cause nervous system problems with long-term exposure. Sulfate can cause digestive issues and may be harmful to infants and people with certain health conditions.
Beyond health concerns, these minerals create everyday problems in your home. Iron stains sinks, toilets, and laundry orange or reddish-brown. You may notice a metallic or bitter taste in your water. These minerals build up inside pipes and water heaters, shortening their lifespan and requiring more frequent repairs.
We recommend testing your well water to see what is actually in it. Every well is different, and your well may have higher or lower levels than what is common in the county. Since multiple analytes exceed health standards, a comprehensive metals and minerals panel is recommended, which typically costs $200-400. Treatment options like reverse osmosis systems or whole-house filtration can address these contaminants once you know what you are dealing with.
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 | 24 | 88% | Moderate | High | |
| Lead | 16 | 69% | Moderate | High | |
| Manganese | 13 | 31% | Low | High | |
| Arsenic | 17 | 29% | Moderate | High | |
| Chloride | 38 | 11% | Moderate | Moderate | |
| Sulfate | 27 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Fluoride | 13 | 0% | Low | Low | |
| HFPO-DA (GenX) ⓘ municipal | 47 | 0% | Moderate | Safe | |
| Nitrate | 43 | 0% | Moderate | Low | |
| Nitrite | 5 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 47 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 49 | 0% | Moderate | Safe | |
| PFOA ⓘ municipal | 50 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 47 | 0% | Moderate | Safe | |
| Radon | 1 | 0% | Low | Low ⓘ | |
| Uranium | 3 | 0% | Low | Low ⓘ | |
| E. coli | 1* | 0% | Low | Safe ⓘ | |
| Hardness | 27 | — | Moderate | Low | |
| PFBS ⓘ municipal | 47 | — | Moderate | Safe | |
| pH | 53 | — | Moderate | Low | |
| Sodium | 13 | — | Low | Low | |
| Total Coliform | 1* | 0% | Low | Safe ⓘ |
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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