EPA radon zones
Oregon radon map: every county's zone
0 of Oregon's 36 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 21 are zone 2 and 15 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
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
How much does radon mitigation cost?
Most single-family systems cost $800 to $2,500 installed, depending on foundation type and how many suction points are needed. A follow-up test confirms the system works.
What do the zones mean?
EPA radon zones describe counties, not houses. Zone 1 counties have a predicted average indoor level above 4 picocuries per liter (pCi/L), Zone 2 between 2 and 4, Zone 3 below 2. Homes with high levels are found in every zone, which is why EPA recommends that every home be tested, and fixed at 4 pCi/L or above.
Oregon cities: water and radon
Source: EPA Map of Radon Zones.