Groundwater in Marquette County contains arsenic, chloride, and bacteria that well owners should monitor. None of these contaminants exceed EPA health standards in the county's water, so contamination levels here are low.
These contaminants come from natural sources in the deep rock layers below. Arsenic and chloride occur naturally in the rock formations that hold the groundwater. Bacteria can enter wells when surface water seeps down through cracks or poor construction, but this is uncommon in most wells here.
Groundwater in Marquette County is hard, driven by calcium and magnesium from the limestone and rock layers below. These minerals dissolve into water as it moves slowly through the deep underground rock. Hardness is widespread across wells throughout this county.
County wells in Marquette do not show contaminants exceeding EPA health standards. However, arsenic, chloride, and bacteria have been detected in some wells in the area and warrant attention. Arsenic in drinking water can cause health problems over time with long-term exposure. Bacteria like E. coli can make you sick right away.
Wells in this county have hard water, which means there is a lot of dissolved minerals. Hard water leaves white, chalky scale buildup inside pipes and appliances. It can shorten the lifespan of water heaters and dishwashers. You might also notice that soap does not work as well for cleaning.
Since every well is different and your well may have different water quality than what is common in the county, we recommend testing. Testing is the only way to know what is actually in your water so you can treat it properly. A basic screening for bacteria and nitrate costs around fifty to one hundred dollars. If testing shows concerns, treatment options like chlorination or water softening can help.
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 ⓘ |
|---|---|---|---|---|---|
| Nitrate | 42 | 33% | Moderate | High | |
| Arsenic | 23 | 0% | Moderate | Low | |
| Chloride | 43 | 0% | Moderate | Low | |
| Fluoride | 43 | 0% | Moderate | Low | |
| HFPO-DA (GenX) | 3 | 0% | Low | Safe ⓘ | |
| Iron | 43 | 0% | Moderate | Low | |
| Lead | 25 | 0% | Moderate | Low | |
| Manganese | 43 | 0% | Moderate | Low | |
| Nitrite | 40 | 0% | Moderate | Low | |
| PFHxS | 3 | 0% | Low | Safe ⓘ | |
| PFNA | 3 | 0% | Low | Safe ⓘ | |
| PFOA | 3 | 0% | Low | Low ⓘ | |
| PFOS | 3 | 0% | Low | Safe ⓘ | |
| Radon | 5 | 0% | Low | Low ⓘ | |
| Sulfate | 43 | 0% | Moderate | Low | |
| Uranium | 28 | 0% | Moderate | Low | |
| Hardness | 43 | — | Moderate | Low | |
| PFBS | 3 | — | Low | Low ⓘ | |
| pH | 45 | — | Moderate | Low | |
| Sodium | 43 | — | 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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