Groundwater in Northumberland County contains manganese, iron, and fluoride at levels that exceed EPA health standards. These contaminants are present at concentrations that well owners need to address.
The sandy and clay layers that make up this coastal plain aquifer system naturally contain manganese and iron minerals that dissolve into groundwater as water moves through the soil. Fluoride occurs naturally in these sediments and accumulates in the water over time. These sources are geological rather than from pollution or land use.
Groundwater in this county is soft but elevated in sodium, driven by the natural mineral content of the coastal plain sediments. The sandy layers here allow water to move slowly through the ground, giving dissolved minerals time to concentrate. These characteristics are widespread across wells throughout the county.
Fluoride, iron, and manganese are found at levels exceeding EPA health standards in wells across Northumberland County. Fluoride at high levels can damage tooth enamel and bone health, especially in children. Iron and manganese can harm the brain and nervous system, with particular concern for young children whose brains are still developing. These contaminants pose real health risks that should be addressed through testing and treatment.
The high sodium content in county well water can leave a salty or unpleasant taste. Iron causes orange or brown staining on fixtures, laundry, and dishes that is hard to remove. While the water here is soft, which is good for appliances, the iron and manganese create separate aesthetic problems that affect daily life and cleaning tasks.
Because every well is different, your well 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. We recommend a comprehensive metals and minerals panel, which runs about two hundred to four hundred dollars, given the multiple contaminants of concern here. Treatment options like iron removal systems and ion exchange softeners can address these issues once you know your specific water composition.
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 | 14 | 14% | Low | Moderate | |
| Iron | 29 | 14% | Moderate | Moderate | |
| Fluoride | 42 | 2% | Moderate | Low | |
| Sulfate | 48 | 0% | Moderate | Low | |
| Nitrite | 14 | 0% | Low | Low | |
| Uranium | 4 | 0% | Low | Safe ⓘ | |
| Nitrate | 36 | 0% | Moderate | Low | |
| Arsenic | 4 | 0% | Low | Low ⓘ | |
| Chloride | 60 | 0% | Moderate | Low | |
| Lead | 4 | 0% | Low | Low ⓘ | |
| Radon | 4 | 0% | Low | Low ⓘ | |
| Hardness | 53 | — | Moderate | Low | |
| pH | 33 | — | Moderate | Low | |
| Sodium | 36 | — | 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.
* 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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