Chloride, iron, lead, manganese, nitrate, and sulfate are present in Northampton County groundwater and exceed EPA health standards. These contaminant levels are high enough that well owners need to be aware and take action.
The coastal plain sits between freshwater aquifer layers and salty ocean water, and that mixing pushes chloride upward into wells. Nitrate comes from septic systems and farm fertilizer soaking down through the soil. Iron and manganese seep from the sediment layers that make up the aquifer itself.
Groundwater in this county is hard, driven by calcium and magnesium that dissolve from the sandy and clay sediment as water moves through. Moderate sulfate levels also come naturally from the aquifer's mineral composition. Hard water and elevated sulfate are common across wells throughout the county.
Wells in Northampton County commonly contain chloride, lead, nitrate, and manganese at levels that exceed EPA health standards. Lead damages children's brain development and can harm kidney function in adults. Nitrate is especially dangerous for babies and can interfere with oxygen in the blood. Manganese at elevated levels can affect the brain and nervous system. Chloride at high concentrations raises blood pressure in people who are salt-sensitive.
Hard water in county wells can shorten the lifespan of water heaters and dishwashers because minerals build up inside them. You may notice staining on sinks, fixtures, and laundry from iron and manganese. Sulfate can give water a bitter taste or rotten-egg smell. Scale buildup inside pipes and on appliances makes cleaning harder and reduces water pressure over time.
Your well is unique and may have higher or lower contamination than what is common in the county. A comprehensive metals and minerals panel costs between $200 and $400 and is the only way to know what is actually in your water so you can treat it properly. We recommend having your well tested right away. Depending on results, treatment options like water softeners, reverse osmosis systems, or activated carbon filters can remove these 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 ⓘ |
|---|---|---|---|---|---|
| Manganese | 113 | 25% | High | High | |
| Nitrate | 135 | 22% | High | High | |
| Iron | 131 | 20% | High | High | |
| Chloride | 172 | 15% | High | High | |
| Sulfate | 149 | 5% | High | Moderate | |
| Lead | 65 | 2% | Moderate | Low | |
| Uranium | 28 | 0% | Moderate | Low | |
| Radon | 6 | 0% | Low | Low ⓘ | |
| Fluoride | 148 | 0% | High | Low | |
| Arsenic | 55 | 0% | Moderate | Low | |
| Nitrite | 119 | 0% | High | Low | |
| pH | 253 | — | High | Low | |
| Sodium | 148 | — | High | Low | |
| Hardness | 149 | — | 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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