Radon Retest Ridge

Understanding Radon and the Need for Testing Radon is a naturally occurring radioactive gas that comes from the breakdown of uranium in soil, rock, and water. It is invisible, odorless, and tasteless, and it can seep into homes through cracks in foundations, gaps around pipes, and other openings. Long-term exposure to elevated radon levels is the second leading cause of lung cancer in the United States, according to the EPA. For homeowners in St. Louis, where the geology in