Well Water in Cabarrus County: What to Test and Why

Groundwater in Cabarrus County contains arsenic, chloride, iron, manganese, nitrite, radon, and PFOS. Several of these contaminants exceed EPA health standards, making them a concern for well owners in this area.

The crystalline bedrock beneath Cabarrus County naturally contains iron and manganese minerals that dissolve into groundwater as water passes through cracks and layers in the rock. Radon, a radioactive gas, seeps from the same bedrock. Arsenic and chloride can come from both natural rock sources and human activity like road salt use and septic systems. Nitrite may enter from septic systems or fertilizer. PFOS comes from industrial sources and some consumer products.

Groundwater in this county is soft overall but notably high in iron, which comes from the crystalline bedrock. The iron concentration here is elevated because water moving through this type of rock readily dissolves iron minerals. High iron is common across wells throughout Cabarrus County and neighboring areas with the same bedrock type.

Wells in Cabarrus County have been found to exceed EPA health standards for arsenic, chloride, iron, manganese, nitrite, PFOS, and radon. Arsenic is a poison that builds up in your body over time and can cause cancer and heart disease. Radon is a radioactive gas that enters your lungs and increases your risk of lung cancer. Nitrite interferes with how your blood carries oxygen, which is especially dangerous for babies and young children. Manganese at high levels can affect brain development and nervous system function.

The high iron levels in county wells cause reddish staining on sinks, toilets, and laundry. You may notice a metallic taste in your water or brown discoloration coming from the tap. Iron buildup can clog pipes and reduce water pressure over time. While the county's water is relatively soft, the iron content still creates visible problems in your home.

We recommend getting your well tested with a comprehensive panel since multiple contaminants exceed health standards in this county. Your well could have much higher or much lower levels than the county average--testing is the only way to know what is actually in your water and how to treat it. A comprehensive metals and contaminants panel typically costs $200 to $400. Treatments like activated carbon filters, ion exchange systems, and radon removal can address these concerns once you know your specific results.