Everyone should test their water for radon. If you find high levels 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. The added protection is sometimes a good selling point. I've lived in my home for so long that it doesn't make sense to take action now.
L still pose some risk.
Developed through a partnership grant of the United States Environmental Protection Agency, Montana State University Extension Service, and the United States Department of Agriculture.