Groundwater in Tuscola County contains iron, arsenic, and chloride. Several of these contaminants exceed EPA health standards, making them a concern for well owners.
These contaminants come from the Marshall aquifer rock formation beneath the county. As groundwater moves slowly through this rock layer over many years, iron, arsenic, and other metals dissolve naturally into the water. Chloride also accumulates in the groundwater, partly from ancient salt deposits within the rock and partly from road salt that seeps downward through soil.
Groundwater in this county is very hard, driven by elevated calcium and magnesium that come from minerals in the Marshall aquifer. Iron also concentrates in the water as it sits in contact with iron-bearing rock in low-oxygen conditions underground. These mineral characteristics are common across wells throughout Tuscola County.
Wells in Tuscola County commonly contain arsenic, chloride, iron, manganese, and sulfate at levels that exceed EPA health standards. Arsenic is a serious concern because long-term exposure increases the risk of cancer and can damage organs like the kidneys and nervous system. Manganese at elevated levels can harm brain development in children. Chloride and sulfate at high concentrations can cause digestive problems with repeated exposure.
Hard water is extremely common in this county. The high iron levels cause reddish-brown staining on sinks, toilets, and laundry. Very hard water leaves white crusty buildup on faucets and shower heads, and it shortens the lifespan of water heaters and dishwashers. You may also notice a metallic taste or slight odor in the water.
We recommend testing your well with a comprehensive metals and minerals panel, since multiple analytes exceed health standards in county wells. Every well is different--your well may have higher or lower levels than what is common here. Testing is the only way to know what is actually in your water so it can be properly treated. A comprehensive panel typically costs $200-400. Treatment options like reverse osmosis systems or iron removal paired with arsenic-specific filters can address these concerns.
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 | 62% | Moderate | High | |
| Arsenic | 21 | 24% | Moderate | High | |
| Chloride | 24 | 12% | Moderate | Moderate | |
| Sulfate | 24 | 8% | Moderate | Moderate | |
| Manganese | 24 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Fluoride | 24 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| Lead | 1 | 0% | Low | Safe ⓘ | |
| Nitrite | 3 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| Uranium | 1 | 0% | Low | Low ⓘ | |
| Nitrate | 3 | 0% | Low | Low ⓘ | |
| Hardness | 24 | — | Moderate | Low | |
| PFBS ⓘ municipal | 6 | — | Low | Safe ⓘ | |
| pH | 25 | — | Moderate | Low | |
| Sodium | 24 | — | 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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