Well Water in Rockbridge County: What to Test and Why

Radon, manganese, and chloride are the contaminants well owners in Rockbridge County should watch for. Levels of manganese and radon exceed EPA health standards in some wells, and chloride is also above the health limit, so testing your well is important.

The limestone and other carbonate rocks beneath this county naturally contain radon, which seeps into groundwater as it moves through cracks and spaces in the rock. Manganese comes from those same rock layers and from natural weathering underground. Chloride can enter groundwater from road salt, septic systems, and natural mineral deposits in the rock.

Groundwater in this county is soft with low iron and sulfate, driven by the carbonate rock that makes up the aquifers here. Soft water is less common in neighboring counties with similar limestone geology, so Rockbridge's wells tend to have gentle water chemistry overall. Most wells across the county show this same soft, mineral-light pattern, though radon and manganese levels vary from well to well.

Wells in Rockbridge County sometimes contain chloride, manganese, and radon at levels above EPA health standards. Radon is a radioactive gas that enters water from rock and soil and increases the risk of cancer when you drink it over time. Manganese can affect how your brain and nervous system work, especially in children. Chloride itself is not a direct health risk at the levels found here, but its presence signals that other contaminants may also be getting into groundwater.

The good news is that the minerals that cause staining, scale, and taste problems are low in county wells. Your water should not leave brown stains on fixtures or leave a metallic taste. You probably won't see white buildup on faucets or inside your dishwasher and water heater. The water here tends to be soft and clean-looking.

We recommend testing your well water to find out what is actually in it, since every well is different and your water may have higher or lower levels than what is common in the county. A comprehensive panel that tests for metals and radon runs between two hundred and four hundred dollars. Testing is the only way to know what needs to be treated, and treatment options like radon aeration systems or manganese filters can work well once you know what you are dealing with.