Groundwater in Delta County contains iron, sulfate, and PFOS at levels that exceed federal health standards. Chloride and radon also exceed their limits, making this a serious water quality situation that requires attention.
These contaminants come from the rock and minerals that make up the county's foundation. Iron and sulfate dissolve naturally as groundwater moves slowly through the bedrock layers. Chloride likely enters from road salt used during winter months. PFOS and radon require more investigation into specific sources, but radon forms from natural radioactive decay in the bedrock itself.
Groundwater in this county is moderately hard, driven mainly by elevated iron and moderate sulfate concentrations. The bedrock releases these minerals as water passes through cracks and spaces over time. Iron and sulfate are common findings across wells throughout Delta County, reflecting the mineral-rich character of the local geology.
Wells in Delta County commonly contain chloride, iron, PFOS, radon, and sulfate at levels exceeding EPA health standards. Radon is a radioactive gas that increases lung cancer risk when breathed in over time. Chloride at elevated levels can harm people with certain health conditions. Iron and PFOS can build up in your body with long-term exposure and cause damage to your organs and health over years.
Beyond health concerns, wells in this county show moderately hard water that creates quality-of-life problems. Iron causes orange and rust-colored staining on sinks, toilets, and laundry. Hard water leaves white crusty buildup on pipes and fixtures, and this buildup can shorten the lifespan of water heaters and dishwashers. You may also notice a metallic taste in the water.
We recommend testing your well to find out what is actually in your water. Every well is different, and your well may have higher or lower levels than what is common in the county. Testing is the only way to know what needs treatment. We recommend a comprehensive metals and minerals panel, which typically costs $200-400. Treatment options like aeration systems and water softeners can help address multiple contaminants at once.
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 | 128 | 39% | High | High | |
| PFOS ⓘ municipal | 8 | 38% | Low | High ⓘ | |
| Manganese | 98 | 14% | Moderate | Moderate | |
| Sulfate | 143 | 13% | High | Moderate | |
| Chloride | 173 | 13% | High | Moderate | |
| Lead | 22 | 9% | Moderate | Moderate | |
| Arsenic | 22 | 0% | Moderate | Low | |
| Fluoride | 65 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| Nitrate | 48 | 0% | Moderate | Low | |
| Nitrite | 25 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 8 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 10 | 0% | Low | Safe | |
| PFOA ⓘ municipal | 12 | 0% | Low | Safe | |
| Radon | 9 | 0% | Low | Low ⓘ | |
| Uranium | 19 | 0% | Moderate | Low | |
| Sodium | 134 | — | High | Low | |
| pH | 63 | — | Moderate | Low | |
| PFBS ⓘ municipal | 8 | — | Low | Safe ⓘ | |
| Hardness | 179 | — | High | 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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