Groundwater in York County contains iron, manganese, chloride, and sulfate at levels that exceed EPA health standards. These contaminants are present in amounts that well owners should address.
The coastal plain aquifer here sits in sandy and clay layers that naturally hold iron and manganese. Saltwater from the ocean and brackish water from nearby rivers push upward and mix with freshwater, bringing chloride deeper into the groundwater. This is the main source of the salt you find in wells across the county.
Groundwater in York County is notably high in iron, which drives much of its mineral character. Iron concentrates in these sediment layers because oxygen is scarce deep underground, allowing iron to dissolve and stay in solution. Most wells in this county show elevated iron levels, making this a widespread concern.
Wells in York County commonly have chloride, iron, manganese, and sulfate at levels above EPA health standards. Chloride can cause problems for people with high blood pressure or heart disease. Iron and manganese exposure over time can affect the nervous system, especially in children and infants. Sulfate in drinking water can cause digestive issues in some people.
The iron and manganese in county wells create visible staining on fixtures, clothes, and dishes that is hard to remove. You may notice a metallic or unpleasant taste in your water. Iron can leave orange or brown discoloration in your sinks and toilets. These minerals build up as scale inside pipes and appliances, which can reduce water flow over time.
Testing is the only way to know what is actually in your well, since every well is different and yours could have higher or lower levels than what is common here. A comprehensive metals and minerals panel typically costs between $200 and $400 and will tell you exactly what you are dealing with. Iron and manganese can be removed with filtration systems or water softeners designed for those specific contaminants.
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 | 94 | 51% | Moderate | High | |
| Manganese | 75 | 35% | Moderate | High | |
| Chloride | 113 | 26% | High | High | |
| Nitrate | 79 | 1% | Moderate | Low | |
| Sulfate | 103 | 1% | High | Low | |
| Arsenic | 1 | 0% | Low | Low ⓘ | |
| Fluoride | 103 | 0% | High | Low | |
| Lead | 1 | 0% | Low | Safe ⓘ | |
| Nitrite | 66 | 0% | Moderate | Low | |
| Radon | 1 | 0% | Low | Low ⓘ | |
| Uranium | 1 | 0% | Low | Safe ⓘ | |
| Hardness | 103 | — | High | Low | |
| pH | 120 | — | High | Low | |
| Sodium | 102 | — | 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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