Groundwater in Macomb County contains manganese, iron, and chloride--all at levels that exceed EPA health standards. Sulfate and sodium also show up at moderate concentrations and are concerning.
These contaminants come from the mixed rock below the county. Iron and manganese occur naturally in the rock itself; as groundwater moves slowly through it, these metals dissolve into the water. Chloride enters from road salt spread on highways and winter roads, which seeps down into the groundwater over time.
Groundwater in this county is moderately high in iron and contains notable amounts of manganese and sodium. The mixed rock types here--neither pure limestone nor pure sandstone--contain iron-bearing minerals that release these metals as water passes through. These characteristics are common across wells throughout the county.
Wells in Macomb County commonly contain chloride, iron, manganese, and sulfate at levels that exceed EPA health standards. Chloride at elevated levels can harm people with high blood pressure or heart disease, and it can damage kidneys over time. Manganese is especially concerning for children because it can affect brain development and learning. Iron and sulfate do not pose direct health risks at the levels found here, but they still indicate your water needs attention.
Wells in this county produce water with moderate mineral content that creates everyday problems. Iron causes orange-brown staining on sinks, toilets, and laundry. You may notice a metallic taste or a rotten-egg smell from sulfate. These minerals build up scale inside pipes and water heaters, which can shorten their lifespan and reduce water pressure over time.
We recommend testing your well water because every well is different and your water 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 well so it can be properly treated. Since multiple contaminants exceed health standards in this area, a comprehensive metals and minerals panel is recommended and typically costs $200-400. Treatment options like whole-house sediment filters paired with water softeners can address these issues.
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 ⓘ |
|---|---|---|---|---|---|
| Manganese | 12 | 83% | Low | High | |
| Iron | 16 | 62% | Moderate | High | |
| Lead | 11 | 36% | Low | High | |
| Arsenic | 11 | 0% | Low | Low | |
| Chloride | 17 | 0% | Moderate | Low | |
| Fluoride | 12 | 0% | Low | Low | |
| HFPO-DA (GenX) ⓘ municipal | 91 | 0% | Moderate | Safe | |
| Nitrate | 13 | 0% | Low | Low | |
| Nitrite | 12 | 0% | Low | Low | |
| PFHxS ⓘ municipal | 91 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 91 | 0% | Moderate | Low | |
| PFOA ⓘ municipal | 91 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 91 | 0% | Moderate | Safe | |
| Radon | 2 | 0% | Low | Low ⓘ | |
| Sulfate | 13 | 0% | Low | Low | |
| Uranium | 7 | 0% | Low | Low ⓘ | |
| E. coli | 118* | 0% | High | Low | |
| Hardness | 13 | — | Low | Low | |
| PFBS ⓘ municipal | 91 | — | Moderate | Safe | |
| pH | 137 | — | High | Low | |
| Sodium | 12 | — | Low | Low | |
| Total Coliform | 73* | 0% | 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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