Radon in Well Water: The Invisible Risk in Your Home

Radon in Groundwater

Radon is a radioactive gas produced by the natural decay of uranium in rock and soil. It dissolves easily in groundwater, especially in areas with granite bedrock. When water containing radon is used for showering, washing, and cooking, the gas is released into indoor air.

Health Risks

Radon is the second leading cause of lung cancer after smoking. The EPA estimates that radon in drinking water causes about 168 cancer deaths per year. The risk comes primarily from inhaling radon released from water rather than drinking it.

High-Risk Areas

New England, the Appalachian Mountain region, and northern Great Plains states typically have the highest radon levels in groundwater. Granite bedrock areas are particularly affected.

Treatment

Aeration systems (bubbling air through water) are most effective, removing 95-99% of radon. Granular activated carbon filters can also work but require careful maintenance due to radioactive buildup on the filter media. Point-of-entry treatment is recommended over point-of-use for radon.