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Counties with the Highest Radon Potential in Oregon

The top 25 of 36 Oregon counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Benton County
3
2Clackamas County
3
3Coos County
3
4Curry County
3
5Deschutes County
3
6Douglas County
3
7Jackson County
3
8Josephine County
3
9Lane County
3
10Lincoln County
3
11Linn County
3
12Marion County
3
13Polk County
3
14Tillamook County
3
15Wallowa County
3
16Baker County
2
17Clatsop County
2
18Columbia County
2
19Crook County
2
20Gilliam County
2
21Grant County
2
22Harney County
2
23Hood River County
2
24Jefferson County
2
25Klamath County
2

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Oregon”, https://gismap.land/rankings/oregon/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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