How many homes have elevated radon levels? The Environmental Protection Agency estimates that nearly 1 of every 15 homes in the U.S. has elevated radon levels. By ProMatcher Staff Updated: 08/08/2016 Next Question Source: National Safety Council Next Question Find Local Pros Free Actuaries Cost Estimates Related Questions What is the second leading cause of lung cancer? Where is radon typically found in the U.S.? Which U.S. state has the greatest concentration of radon? How many lung cancer deaths are related to radon? How Much Does It Cost to Get Rid of Radon?