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Radon is a radioactive gas that forms naturally from the decay of radioactive elements in the soil, rock, and groundwater. It is colorless and odorless. Radon can seep through gaps and cracks in a foundation and accumulate inside homes and buildings. Breathing elevated concentrations of radon over time can increase the risk of developing lung cancer. The U.S. Environmental Protection Agency (EPA) estimates radon causes 21,000 deaths per year and is the second leading cause of lung cancer in the United States, after smoking.

More information is available from the department's Radon program where you can request a FREE radon test kit.

Radon Dashboard

Use each tab below to see data on residential radon test results and housing units tested.

Test Results ≥4 pCi/L

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