Your well water comes from old rock layers filled with cracks and spaces that hold groundwater. These rocks formed hundreds of millions of years ago and break down slowly over time. Water moves through these fractured layers and picks up minerals and gases along the way.
Radon seeps into your water from natural radioactive elements trapped in the rock itself. Iron and manganese dissolve into the water because the rock contains iron-bearing minerals that break down in low-oxygen conditions underground. Arsenic and chloride show up from the minerals in the bedrock. These contaminants come straight from the stone, not from pollution on the surface.
Your water is extremely hard and carries very high levels of sodium and sulfate. The minerals in the rock dissolve into the water as it moves through the cracks, making it harsh on pipes, water heaters, and laundry. You will see white scale buildup and rust-colored stains on fixtures. Test your well now and talk to a water treatment professional about systems to reduce these minerals.
Your well water exceeds EPA health standards for arsenic, radon, iron, and manganese. Radon is the most urgent concern because it's a radioactive gas that builds up in your home. Iron and manganese also exceed safe levels and need attention.
Long-term exposure to arsenic increases cancer risk and can damage organs. Radon in water releases gas into the air you breathe indoors, raising lung cancer risk. High iron stains sinks, toilets, and laundry orange-brown. Manganese can affect brain development in children and cause neurological problems over time.
Get your well tested now by a certified lab. A basic health screen for bacteria and nitrate runs $50–100, but you need a comprehensive metals panel for $200–400 that includes radon, arsenic, iron, and manganese. A whole-house treatment system combining filtration and aeration can address multiple contaminants at once.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Radon | 18 | 82% | 11% · 11% · 78% | Moderate | High ⓘ |
| Iron | 5 | 50% | 40% · 20% · 40% | Low | High |
| Manganese | 78 | 27% | 64% · 9% · 27% | Moderate | High |
| Arsenic | 43 | 10% | 84% · 7% · 9% | Moderate | Moderate |
| Chloride | 78 | 6% | 94% · 0% · 6% | Moderate | Moderate |
| Lead | 31 | 0% | 100% · 0% · 0% | Moderate | Low |
| Uranium | 25 | 0% | 100% · 0% · 0% | Moderate | Low |
| Nitrite | 3 | 0% | 100% · 0% · 0% | Low | Low |
| Sulfate | 39 | 0% | 100% · 0% · 0% | Moderate | Low |
| Sodium | 69 | — | — | Moderate | Low |
| Nitrate | 1 | — | — | Low | Low |
| Nitrite | 1 | — | — | Low | Low |
| pH | 12 | — | — | Low | Low |
| Nitrate | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Fluoride | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Fecal Coliform | 1 | — | — | Low | Safe |
| E. coli | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Total Coliform | 1 | 0% | 100% · 0% · 0% | Low | Safe |
| Hardness | 16 | — | — | 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.
Population-level CDC data. Not individual risk prediction.
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