Groundwater in Ottawa County contains iron, sulfate, and chloride at concentrations that exceed EPA health standards. Chloride, iron, manganese, PFOA, and sulfate all exceed their maximum contaminant levels, making this a serious concern for well owners.
The rock beneath Ottawa County naturally releases iron, manganese, and sulfate as groundwater moves slowly through it. Chloride enters partly from road salt applied to roads during winter. The low-oxygen conditions deep underground speed up the release of these metals and minerals from the rock itself.
Groundwater in this county is very hard, driven by elevated calcium, magnesium, iron, and sodium. These minerals concentrate here because of the natural composition of the rock layers and the slow movement of water through them. Very hard water with high iron and sodium is common across wells throughout Ottawa County.
Wells in Ottawa County commonly contain chloride, iron, manganese, PFOA, and sulfate at levels that exceed EPA health standards. Manganese and iron can harm brain development in children with long-term exposure. PFOA is a chemical linked to health problems including kidney and liver damage. Chloride and sulfate at elevated levels are also health concerns that warrant attention.
The water in this county is extremely hard, which means scale will build up quickly inside pipes, water heaters, and dishwashers and can shorten their lifespan. Iron causes orange and brown staining on sinks, toilets, and laundry. The high sodium and sulfate levels may affect taste. You may notice a metallic or bitter flavor in the water.
We recommend a comprehensive metals and minerals panel to find out what is actually in your well, since every well is different and your water may have higher or lower levels than what is common here. Testing is the only way to know what needs treatment. A comprehensive panel typically costs $200-400. Treatment options include iron removal systems and reverse osmosis filters.
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 | 15 | 67% | Moderate | High | |
| Sulfate | 16 | 44% | Moderate | High | |
| Chloride | 16 | 19% | Moderate | High | |
| Manganese | 9 | 11% | Low | Moderate ⓘ | |
| PFOA ⓘ municipal | 55 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Arsenic | 9 | 0% | Low | Low ⓘ | |
| Fluoride | 15 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 53 | 0% | Moderate | Safe | |
| Nitrite | 3 | 0% | Low | Safe ⓘ | |
| PFHxS ⓘ municipal | 53 | 0% | Moderate | Low | |
| PFNA ⓘ municipal | 56 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 53 | 0% | Moderate | Low | |
| Nitrate | 10 | 0% | Low | Low | |
| Hardness | 16 | — | Moderate | Low | |
| PFBS ⓘ municipal | 53 | — | Moderate | Low | |
| pH | 18 | — | Moderate | Low | |
| Sodium | 9 | — | Low | 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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