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Radon Risk in Oregon

Radon risks in Oregon are preventable

The Oregon Public Health Division recommends that all homes test for radon regardless of the risk level assigned to the home's geographic location.

  • The map and table provided below 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.
  • 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.

Map of Radon Risk Levels in Oregon Radon Risk Level Zip Code Table Radon Risk Level Assignment

If your zip code has no risk level assigned, you may be eligible for a free test kit. Call or email us today!

The following Oregon counties require radon resistent new construction (RRNC): 

  • Baker, Clackamas, Hood River, Multnomah, Polk, Washington, and Yamhill counties. 
  • The Appendix F: Radon Control Methods (pdf) details the RRNC radon mitigation requirements for each of these counties.

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