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In York, groundwater can pick up radon from surrounding rocks, especially where granite or shale lie beneath the surface. This radioactive gas dissolves into well water, increasing the risk of indoor exposure when the water is used for showers or washing. Local health officials recommend testing private wells for radon, as concentrations vary widely across the county.

[https://radonfaninstallationstore.timeforchangecounselling.com/why-radon-fan-installation-matters-for-york-county-homes radon and groundwater in York 9]