Radon is a radioactive gas that comes naturally from soil and rocks. Radon can move from the ground into your home through cracks and holes in the foundation. It can also enter a home through private well water.

Radon can build up inside your house and cause lung cancer if you breathe it in over many years. Radon is the #1 cause of lung cancer among people who don’t smoke. Lung cancer risk is much higher for people who are exposed to radon and smoke.