Radon is a radioactive gas that has been found in homes all over the United States. It comes from the natural breakdown of uranium in soil, rock, and water. Radon typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation.
When a home is being tested for radon, it is important to control the environment as much as possible in order to yield accurate results. Below is a list of requirements, guidelines, and tips to ensure accurate readings.
The EPA recommends radon mitigation in homes if the radon level is 4 picocuries per liter (pCi/L) or higher. Radon levels less than 4 pCi/L can still pose a risk and, in many cases, can also be reduced by mitigation.
Oregon.gov outlines radon risk levels by zip code. There are some areas that are more prone to higher radon levels than others. A PDF of risk by zip code can be found here and a map of Oregon with radon risk levels can be viewed here. Not all properties in zip codes prone to high levels will have radon issues. Testing is always recommended to verify levels in any property.
For more information on radon, the risk, importance of testing and to get more information on remedies, click here. This workbook has been published by the EPA.