Roscommon County's groundwater comes from a mixed layer of old rock and sediment underground. This rock is not one solid type but rather a jumbled collection of different materials. Water moves through the spaces and cracks in this mixed rock layer, storing itself in the pores between grains.
The rock here is naturally protective. Old rock layers sit deep enough that surface pollution from farms, roads, or septic systems does not easily reach the water. The geology screens out most contaminants before they can enter your well. This natural protection is why testing shows no harmful substances in local groundwater.
The mineral content of your water depends on which specific rock layers your well taps. Since detailed mineral data is not available for the county, your own well could carry different minerals than a neighbor's well. Testing your water will show you what is actually coming out of your tap and what, if anything, needs treatment.
No contaminants have been detected in Roscommon County well water data, and nothing exceeds EPA health standards. This is good news for your well. However, because the area is flagged for arsenic priority monitoring, testing your own water is still important to confirm your specific situation.
Since no contaminants are showing up in the county data, long-term health effects from the tested substances are not a concern right now. You should not expect staining, scaling, taste problems, or odor from the contaminants tracked in this area. That said, your individual well could still have other issues worth knowing about.
Get your well water tested by a state-certified lab to be certain. A basic health screen for bacteria and nitrate runs fifty to one hundred dollars. A comprehensive minerals and metals panel runs two hundred to four hundred dollars. Ask the lab to test for arsenic since your area is being monitored for it.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Manganese | 5 | 60% | 40% · 0% · 60% | Low | High |
| Iron | 7 | 57% | 43% · 0% · 57% | Low | High |
| Arsenic | 3 | 50% | 67% · 0% · 33% | Low | High |
| Chloride | 57 | 2% | 96% · 2% · 2% | Moderate | Low |
| Sulfate | 6 | 0% | 100% · 0% · 0% | Low | Low |
| Fluoride | 2 | 0% | 100% · 0% · 0% | Low | Low |
| Nitrite | 2 | 0% | 100% · 0% · 0% | Low | Low |
| E. coli | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Nitrate | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| pH | 9 | — | — | Low | Low |
| Sodium | 8 | — | — | Low | Low |
| Nitrate | 7 | — | — | 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.
Population-level CDC data. Not individual risk prediction.
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