Radon in Oregon

About 3 in 10 homes tested in Oregon were at or above the EPA action level of 4 pCi/L.

52%23%25%

17,034 homes tested, 2008–2017

The line marks the EPA action level, 4 pCi/L.

The EPA puts 0 of Oregon's 36 counties in Zone 1, its highest radon category, 21 in Zone 2 and 15 in Zone 3.

Every county in Oregon

Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.

County	Homes tested	At or above 4	Median	EPA zone
Union County		42%	3.0 pCi/L	2
Clatsop County		40%	3.0 pCi/L	2
Baker County		38%	2.4 pCi/L	2
Columbia County		37%	1.9 pCi/L	2
Multnomah County		33%	2.5 pCi/L	2
Hood River County		31%	2.3 pCi/L	2
Tillamook County	12 tests	–	–	3
Wallowa County	8 tests	–	–	3
Yamhill County		26%	1.5 pCi/L	2
Marion County		26%	2.0 pCi/L	3
Polk County		25%	2.0 pCi/L	3
Harney County	5 tests	–	–	2
Clackamas County		18%	1.4 pCi/L	3
Curry County	7 tests	–	–	3
Lincoln County		13%	1.1 pCi/L	3
Benton County		13%	1.2 pCi/L	3
Umatilla County		12%	1.9 pCi/L	2
Coos County	14 tests	–	–	3
Washington County		10%	1.0 pCi/L	2
Josephine County		10%	0.7 pCi/L	3
Linn County		10%	1.0 pCi/L	3
Lane County		9%	0.9 pCi/L	3
Douglas County		9%	0.6 pCi/L	3
Malheur County	12 tests	–	–	2
Wasco County		6%	1.0 pCi/L	2
Crook County	19 tests	–	–	2
Jackson County		5%	1.0 pCi/L	3
Klamath County		5%	0.4 pCi/L	2
Deschutes County		4%	0.7 pCi/L	3
Grant County	3 tests	–	–	2
Jefferson County	7 tests	–	–	2
Lake County	3 tests	–	–	2
Morrow County	2 tests	–	–	2
Wheeler County	1 tests	–	–	2
Gilliam County	No data	–	–	2
Sherman County	No data	–	–	2

"–" means fewer than 20 tests or no lab data, too few for a reliable figure.

EPA Map of Radon Zones (public domain).
CDC Environmental Public Health Tracking Network, radon tests from labs, 2008–2017. Pre-mitigation tests only.