Radon levels can vary greatly from home to home. The only way to know if your home has a radon problem is to test. If you find high Radon levels in your home, and your water comes from a well, contact a lab certified to measure radiation in water to have your water tested. It's difficult to sell homes where radon problems have been discovered. I've lived in my home for so long, it doesn't make sense to take action now.
L still pose some risk.
Radon is a radioactive gas that is colorless, odorless and tasteless. It typically moves up through the ground to the air above, and migrates into your home through cracks and other holes in the foundation. Your home traps radon inside, where it can build up. Any home may have a radon problem. This means new and old homes, well-sealed and drafty homes, and homes with or without basements.