Well owners in Marshall County need to know that lead, arsenic, chloride, iron, manganese, nitrate, and sulfate are present in groundwater at levels that exceed federal health standards. Several of these contaminants reach very high or moderate concentrations that require attention.
The rock layers beneath Marshall County naturally release iron, manganese, and arsenic into water that flows through them. Nitrate and chloride enter groundwater from agricultural practices and road salt. Lead comes from old pipes and plumbing in some homes. The combination of the rock chemistry and human activities in this agricultural region creates multiple pathways for contamination to reach wells.
Groundwater in this county is very hard, driven by elevated calcium and magnesium from the rock below, and iron reaches very high levels while sodium and sulfate also concentrate in the water. These minerals dissolve naturally as water moves slowly through the underground rock layers. Most wells in Marshall County show these mineral characteristics at notable levels.
Wells in Marshall County commonly exceed EPA health standards for lead, arsenic, chloride, nitrate, iron, and manganese. Lead and arsenic are toxic metals that can damage children's brains and learning abilities, and cause cancer with long-term exposure. Nitrate is especially dangerous for babies and can interfere with oxygen in their blood. Iron and manganese at high levels can affect brain development and cause other health problems over time.
County well water is very hard, which creates practical problems for your home. You will see rust-colored stains on fixtures, laundry, and dishes from the high iron. Scale builds up inside pipes and water heaters, shortening the lifespan of appliances like dishwashers and water heaters. You may notice a metallic or bitter taste and smell in the water.
Your well could have higher or lower levels than what is common in the county, so testing is recommended to know what you are actually dealing with. A comprehensive metals and minerals panel costs between $200 and $400 and will tell you exactly what needs treatment. Iron and manganese removal systems or water softening can address multiple concerns at once. Testing is the only way to protect your family with the right solution for your specific well.
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 | 68 | 81% | Moderate | High | |
| Manganese | 38 | 45% | Moderate | High | |
| Arsenic | 10 | 40% | Low | High | |
| Chloride | 87 | 30% | Moderate | High | |
| Sulfate | 76 | 18% | Moderate | High | |
| Nitrate | 59 | 10% | Moderate | Moderate | |
| Lead | 28 | 7% | Moderate | Moderate | |
| Fluoride | 69 | 0% | Moderate | Low | |
| Nitrite | 6 | 0% | Low | Low ⓘ | |
| Sodium | 74 | — | Moderate | Low | |
| pH | 67 | — | Moderate | Low | |
| Hardness | 68 | — | 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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