Groundwater in Columbia County contains radon, iron, chloride, and other dissolved minerals. Several of these contaminants exceed EPA health standards, with chloride, sulfate, iron, lead, and radon detected at concerning levels.
The carbonate rock beneath this county naturally releases iron and minerals into water as it slowly dissolves. Chloride and sulfate come from both rock weathering and salt used on roads and in de-icing. Radon seeps from radioactive elements present in the bedrock itself.
Groundwater in this county is moderately hard, driven by calcium and magnesium from the limestone and carbonate rock below. Water moving through these rock layers picks up these hardness minerals over time. Moderate iron levels and this moderate hardness show up across many wells in the county.
Wells in Columbia County commonly have several contaminants above EPA health standards. Lead can harm children's brain development and affect nervous system function in people of all ages. Radon is a radioactive gas that increases lung cancer risk when breathed in over many years. Chloride and sulfate at elevated levels can cause health concerns for certain groups, particularly people on sodium-restricted diets or with specific medical conditions. Iron, while primarily an aesthetic issue, can still accumulate in the body at high enough levels.
The moderately hard water in county wells creates visible quality-of-life impacts. Iron causes reddish or brownish staining on fixtures, clothing, and surfaces that is hard to remove. You may notice a metallic taste in drinking water or a musty odor. Scale buildup can accumulate on pipes and inside appliances, and moderately hard water can shorten the lifespan of water heaters and dishwashers.
Every well is different, and your well may have higher or lower levels than what is common across the county. Testing is the only way to know what is actually in your water so it can be properly treated. We recommend a comprehensive metals and minerals panel to check for lead, radon, chloride, sulfate, and iron, which typically costs $200-400. Treatment options like activated carbon filters, radon mitigation systems, or ion exchange softeners can address these concerns depending on test results.
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 ⓘ |
|---|---|---|---|---|---|
| Manganese | 23 | 39% | Moderate | High | |
| Iron | 23 | 30% | Moderate | High | |
| Radon | 17 | 29% | Moderate | High ⓘ | |
| Arsenic | 17 | 0% | Moderate | Low | |
| Chloride | 23 | 0% | Moderate | Low | |
| Fluoride | 23 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| Lead | 17 | 0% | Moderate | Low | |
| Nitrate | 23 | 0% | Moderate | Low | |
| Nitrite | 18 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 6 | 0% | Low | Safe ⓘ | |
| Sulfate | 23 | 0% | Moderate | Low | |
| Uranium | 11 | 0% | Low | Low | |
| Total Coliform | 4* | 0% | Low | Low ⓘ | |
| Sodium | 23 | — | Moderate | Low | |
| pH | 23 | — | Moderate | Low | |
| PFBS ⓘ municipal | 6 | — | Low | Safe ⓘ | |
| Hardness | 23 | — | Moderate | Low | |
| Fecal Coliform | 4* | 0% | Low | Safe ⓘ | |
| E. coli | 4* | 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.
* 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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