Originally Posted By: dandersen
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It should be noted however that these rates on maps were based on the results of radon testing. If fewer tests are conducted at certain locations (such as low populated areas), the results of projected concentrations will be lower or higher based on a fewer number of tests to be averaged within the group.
I inspect in areas with a reasonably high radon concentration on this map but find that a very small percentage of homes actually have a major radon problem. Other areas on this map, such has in the mountains of eastern Tennessee show a lower concentration level however I have done mitigation with the US EPA in the Smoky Mountains. So even in an lower zones, there is radon problems.
As the EPA says, the only way to know if you have a radon problem is to test for it.