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Radon zones in Oregon

The EPA assigns every county in Oregon to one of three radon potential zones. No county in Oregon is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

36
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
21
Zone 2 counties
Predicted average 2-4 pCi/L
15
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Oregon

Every county in Oregon, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 21Zone 3 · 15

Hover a county · click to open it

County by county

All 36 Oregon counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Baker County217k9.1%13.8%44.2
Clatsop County241k8.3%13.2%28.7
Columbia County254k7.9%14.3%38.4
Crook County227k8.1%13.0%34.5
Gilliam County22,02610.4%14.8% -
Grant County27,21510.2%14.4%31.2
Harney County27,44010.6%16.2%30.9
Hood River County224k6.4%11.4%20.7
Jefferson County225k8.0%14.6%34.7
Klamath County270k9.4%15.1%38.7
Lake County28,29310.0%15.6%26.4
Malheur County232k8.6%15.9%34.1
Morrow County212k8.9%16.0%34.5
Multnomah County2790k5.3%12.0%28.0
Sherman County21,9519.9%15.3% -
Umatilla County280k7.8%14.6%35.6
Union County226k8.4%13.7%21.2
Wasco County226k8.6%14.5%42.3
Washington County2599k5.0%9.7%22.6
Wheeler County21,43611.4%14.1% -
Yamhill County2109k6.8%11.8%30.0
Benton County398k5.7%9.6%23.2
Clackamas County3423k6.0%10.5%25.5
Coos County364k9.9%15.2%42.7
Curry County323k10.5%13.4%39.2
Deschutes County3209k6.4%10.6%22.8
Douglas County3112k9.7%14.5%42.0
Jackson County3221k8.0%12.9%28.7
Josephine County388k10.4%15.5%40.9
Lane County3381k7.5%12.2%32.6
Lincoln County351k9.8%13.6%39.0
Linn County3131k8.0%14.2%42.7
Marion County3347k7.2%12.4%31.5
Polk County390k7.0%11.8%29.4
Tillamook County327k9.0%13.2%39.0
Wallowa County37,6748.2%11.8%26.3

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere