Well Water in Dauphin County: What to Test and Why

Groundwater in Dauphin County contains lead, radon, and iron that well owners should monitor. These contaminants exceed EPA health standards at levels that warrant immediate attention and testing.

Lead and radon come from natural sources in the bedrock beneath the county. The Valley and Ridge carbonate rock contains uranium that breaks down over time, releasing radon gas into groundwater. Lead enters water as it moves through cracks in the limestone and from old metal pipes in well systems. Iron dissolves directly from minerals in the same rock layers where radon forms.

Groundwater in this county is moderately hard, driven by calcium and magnesium from the carbonate bedrock, and carries elevated iron. The limestone aquifer naturally releases these minerals as water flows through fractures and passes over rock surfaces. Moderately hard water with elevated iron is common across wells in Dauphin County, though individual well results vary.

Wells in Dauphin County commonly exceed EPA health standards for iron, lead, PFOA, PFOS, radon, and sulfate. Lead damages children's brain development and can harm kidney function in people of all ages. Radon is a radioactive gas that increases lung cancer risk when breathed in from contaminated water. PFOA and PFOS are industrial chemicals that can affect liver function, immune system development, and thyroid health with long-term exposure. Iron itself does not cause direct health problems, but the other contaminants present real concerns for your family's health.

County well water tends to be moderately hard, which leaves white crusty buildup on fixtures and inside pipes. Iron staining appears as orange or brown marks on sinks, toilets, and laundry. The mineral content can shorten the lifespan of water heaters and dishwashers over time. Some wells may have a slightly metallic or sulfurous taste.

We recommend having your well tested by a certified lab right away because multiple contaminants exceed health standards. 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 you can treat it properly. A comprehensive metals and radon panel typically costs $200-400 and will show whether treatment is needed. Aeration systems and activated carbon filters can address several of these contaminants.