Radon risks in Oregon are preventable.
Oregon Public Health Division recommends that all
homes test for radon regardless of the risk level assigned to the
home's geographic location.
map and table provided should not be used to substitute for radon testing of
an individual home. Home radon test results can vary greatly
from neighbor to neighbor. The only way to know if you have high radon levels
in your home is to test YOUR home.
The data presented in the links to the map and table contain long-term indoor radon test results (more than 90 days) and short-term indoor radon test results (2-90 days) that have been conducted primarily by residents of single family homes.
Multifamily housing, apartments, office buildings, and schools have more complex and different standards for radon testing. An advanced certification for professionals is available to perform radon measurements in large buildings. Learn more about testing for radon in large buildings in the advanced certification section here.
Indoor radon levels can be influenced by weather, season, geology, type of construction and heating, ventilation and air conditioning systems. Because of this, radon levels may not be consistent among a group of homes, even those next door to each other.
Most areas assigned a low risk level include at least one test result that is higher than the EPA action level of 4 picocuries per liter of air (4piC/L). Testing a home is the only way to know what the level of radon is in a home.