Radon is a colorless, odorless, tasteless, and chemically inert radioactive gas. It is formed by the natural radioactive decay of uranium in rock, soil, and water. Naturally existing, low levels of uranium occur widely in Earth's crust. It can be found in all 50 states. Unless you test for it, there is no way of telling how much is present.

National Radon Hotlines

  • National Radon Hotline: Purchase radon test kits by phone.
    1-800-SOS-RADON (767-7236)
     
  • National Radon Helpline: Get live help for your radon questions.
    1-800-55RADON (557-2366)
     
  • National Radon Fix-It Line: For general information on fixing or reducing the radon level in your home.
    (800) 644-6999
     
  • Living Healthy and Green Hotline
    (866) 730-4733