Radon by ZIP

Radon zones in Oregon

Last updated

EPA’s Map of Radon Zones places 36 Oregon counties in its three radon potential zones: 0 in Zone 1 (highest), 21 in Zone 2 (moderate), and 15 in Zone 3 (low).

0Zone 1 · Highest potential
21Zone 2 · Moderate potential
15Zone 3 · Low potential

What this means for Oregon homes

Most Oregon counties fall in Zone 2. EPA predicts moderate average indoor levels (2 to 4 pCi/L) across much of Oregon. Many homes will be below the action level, but many will not, and only a test can tell which.

EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.

Oregon radon program

EPA lists the following state contact for Oregon: the state radon program, phone 971-673-0440. Website: www.oregon.gov/oha/PH/HEALTHYENVIRONMENTS/HEALTHYNEIGHBORHOODS/RADONGAS/Pages/index.aspx. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.

Oregon counties and their EPA radon zones

CountyEPA radon zone
Baker CountyZone 2
Benton CountyZone 3
Clackamas CountyZone 3
Clatsop CountyZone 2
Columbia CountyZone 2
Coos CountyZone 3
Crook CountyZone 2
Curry CountyZone 3
Deschutes CountyZone 3
Douglas CountyZone 3
Gilliam CountyZone 2
Grant CountyZone 2
Harney CountyZone 2
Hood River CountyZone 2
Jackson CountyZone 3
Jefferson CountyZone 2
Josephine CountyZone 3
Klamath CountyZone 2
Lake CountyZone 2
Lane CountyZone 3
Lincoln CountyZone 3
Linn CountyZone 3
Malheur CountyZone 2
Marion CountyZone 3
Morrow CountyZone 2
Multnomah CountyZone 2
Polk CountyZone 3
Sherman CountyZone 2
Tillamook CountyZone 3
Umatilla CountyZone 2
Union CountyZone 2
Wallowa CountyZone 3
Wasco CountyZone 2
Washington CountyZone 2
Wheeler CountyZone 2
Yamhill CountyZone 2

County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.

Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.

Sources

  1. U.S. EPA, EPA Map of Radon Zones (text version)
  2. U.S. EPA, EPA Map of Radon Zones and Supplemental Information (state radon contacts)
  3. U.S. EPA, EPA Maps of Radon Zones and Supporting Documents by State