Groundwater in Fairfield County contains iron, manganese, arsenic, and lead at levels that exceed EPA health standards. These contaminants are present at concerning concentrations that require attention.
The bedrock beneath Fairfield County naturally contains iron and manganese in iron-rich rock layers. As water moves slowly through cracks and tiny spaces in the stone, it dissolves these metals directly from the rock itself. Arsenic also occurs naturally in certain rock layers in this region. Lead can enter from older well components or pipes rather than from the rock alone.
Groundwater in this county is very hard, driven by elevated calcium and magnesium dissolved from the bedrock. The water also carries very high iron and moderate sodium. These mineral characteristics are widespread across wells throughout the county.
Wells in Fairfield County commonly contain arsenic, iron, lead, and manganese at levels that exceed EPA health standards. Arsenic builds up in your body over time and increases the risk of cancer, heart disease, and skin problems. Lead is especially dangerous for children because it can harm brain development and learning. Manganese at elevated levels can affect how your nervous system works and impact behavior and memory. Iron and lead together create serious health concerns that need attention right away.
The water in this county is extremely hard, which means you will see thick white crusty buildup on faucets, showerheads, and inside pipes. Iron at the high levels found here causes orange-brown or rust-colored stains on sinks, toilets, and laundry. Manganese creates dark brown or black stains. The extreme hardness can shorten the lifespan of water heaters and dishwashers. You may also notice a metallic taste or rotten-egg smell from the sulfate.
We recommend testing your well right away because every well is different and yours may have higher or lower levels than what is common in the county. Testing is the only way to know what is actually in your water so it can be properly treated. A comprehensive metals and minerals panel typically costs two hundred to four hundred dollars. Treatment options like whole-house filtration systems combined with water softeners can 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 | 161 | 85% | High | High | |
| Manganese | 145 | 77% | High | High | |
| Arsenic | 123 | 24% | High | High | |
| Lead | 130 | 5% | High | Moderate | |
| Chloride | 166 | 0% | High | Low | |
| Fluoride | 111 | 0% | High | Low | |
| HFPO-DA (GenX) ⓘ municipal | 10 | 0% | Low | Safe | |
| Nitrate | 24 | 0% | Moderate | Low | |
| Nitrite | 18 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 10 | 0% | Low | Safe | |
| PFNA ⓘ municipal | 10 | 0% | Low | Safe | |
| PFOA ⓘ municipal | 10 | 0% | Low | Safe | |
| PFOS ⓘ municipal | 10 | 0% | Low | Safe | |
| Radon | 2 | 0% | Low | Low ⓘ | |
| Sulfate | 32 | 0% | Moderate | Low | |
| Uranium | 3 | 0% | Low | Low ⓘ | |
| Sodium | 167 | — | High | Low | |
| pH | 108 | — | High | Low | |
| PFBS ⓘ municipal | 10 | — | Low | Safe | |
| Hardness | 115 | — | 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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