Guernsey County's groundwater comes from old rock layers made of sandstone, shale, and coal-bearing stone formed from ancient swamps and sea beds. These rocks have small cracks and spaces where water moves slowly through the ground. Your well taps into water that has been sitting in contact with these rocks for a long time.
Manganese, iron, and sulfate appear in this water because they dissolve naturally from the rock itself. The coal seams and dark shale layers in this area contain iron and sulfate minerals that break down when water passes through them. The slow movement of water through tight rock means it picks up more minerals over time, and nothing in the geology stops this process.
Your water is very hard and full of dissolved minerals. The high sodium and sulfate will leave white crusty buildup on pipes and inside water heaters. The iron will stain your sinks and laundry orange-brown, and you may notice a salty or metallic taste.
Arsenic in Guernsey County well water exceeds EPA health standards. Iron, manganese, and sulfate also exceed EPA standards. The combination of these contaminants at detected levels means your family's water needs immediate attention. This is a high-priority situation.
Long-term exposure to arsenic increases the risk of cancer and organ damage. Manganese can harm the nervous system and brain development in children. The extremely high iron and sulfate levels will stain your sinks, toilets, and laundry orange-brown. You will see white crusty scale building up inside pipes and on water heaters. Your water may taste metallic or salty.
Get your well tested by a state-certified lab right away. A comprehensive mineral and metals panel costs $200 to $400 and will show exactly what you're dealing with. Contact the Ohio Department of Health or your county health department for lab recommendations. A whole-house treatment system combining sediment filtration and arsenic removal is necessary for this water.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Manganese | 19 | 89% | 5% · 10% · 84% | Moderate | High |
| Iron | 73 | 69% | 19% · 12% · 68% | Moderate | High |
| Sulfate | 77 | 35% | 53% · 12% · 35% | Moderate | High |
| Arsenic | 8 | 29% | 50% · 25% · 25% | Low | High |
| Chloride | 63 | 13% | 79% · 8% · 13% | Moderate | Moderate |
| Fluoride | 6 | 0% | 100% · 0% · 0% | Low | Low |
| Sodium | 54 | — | — | Moderate | Low |
| pH | 13 | — | — | Low | Low |
| Nitrite | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Nitrate | 1 | — | — | Low | Safe |
| Nitrate | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Lead | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Hardness | 1 | — | — | Low | Safe |
| Fecal Coliform | 1 | — | — | Low | Safe |
| E. coli | 1 | 0% | 100% · 0% · 0% | Low | Safe |
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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