Radon levels in Oregon

Verified county-level radon indicators are available for 34 Oregon counties. Select a county for its source period and sample details.

High results are most common in Union County (42%) and least common in Deschutes County (4%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 34 of 36 counties have data
Baker County: 38% of tests at or above 4 pCi/L · 40 testsBenton County: 13% of tests at or above 4 pCi/L · 366 testsClackamas County: 18% of tests at or above 4 pCi/L · 3,802 testsClatsop County: 40% of tests at or above 4 pCi/L · 55 testsColumbia County: 37% of tests at or above 4 pCi/L · 212 testsCoos County: 11% of tests at or above 4 pCi/L · 18 testsCrook County: 5% of tests at or above 4 pCi/L · 37 testsCurry County: 17% of tests at or above 4 pCi/L · 6 testsDeschutes County: 4% of tests at or above 4 pCi/L · 159 testsDouglas County: 9% of tests at or above 4 pCi/L · 34 testsGilliam County: no dataGrant County: 0% of tests at or above 4 pCi/L · 4 testsHarney County: 20% of tests at or above 4 pCi/L · 5 testsHood River County: 31% of tests at or above 4 pCi/L · 133 testsJackson County: 5% of tests at or above 4 pCi/L · 113 testsJefferson County: 0% of tests at or above 4 pCi/L · 8 testsJosephine County: 10% of tests at or above 4 pCi/L · 30 testsKlamath County: 5% of tests at or above 4 pCi/L · 38 testsLake County: 0% of tests at or above 4 pCi/L · 4 testsLane County: 9% of tests at or above 4 pCi/L · 405 testsLincoln County: 13% of tests at or above 4 pCi/L · 38 testsLinn County: 9% of tests at or above 4 pCi/L · 116 testsMalheur County: 8% of tests at or above 4 pCi/L · 12 testsMarion County: 26% of tests at or above 4 pCi/L · 1,394 testsMorrow County: 0% of tests at or above 4 pCi/L · 2 testsMultnomah County: 33% of tests at or above 4 pCi/L · 12,330 testsPolk County: 25% of tests at or above 4 pCi/L · 575 testsSherman County: no dataTillamook County: 31% of tests at or above 4 pCi/L · 13 testsUmatilla County: 12% of tests at or above 4 pCi/L · 34 testsUnion County: 42% of tests at or above 4 pCi/L · 112 testsWallowa County: 27% of tests at or above 4 pCi/L · 15 testsWasco County: 6% of tests at or above 4 pCi/L · 36 testsWashington County: 10% of tests at or above 4 pCi/L · 3,338 testsWheeler County: 0% of tests at or above 4 pCi/L · 2 testsYamhill County: 26% of tests at or above 4 pCi/L · 465 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

CountyTests% ≥ 4 pCi/LMedian (pCi/L)EPA zone (1993)Source
Baker County4038%2.4Zone 2Radon test results from laboratories through 2017
Benton County36613%1.2Zone 3Radon test results from laboratories through 2017
Clackamas County3,80218%1.4Zone 3Radon test results from laboratories through 2017
Clatsop County5540%3.0Zone 2Radon test results from laboratories through 2017
Columbia County21237%1.9Zone 2Radon test results from laboratories through 2017
Coos County1811%0.6Zone 3Radon test results from laboratories through 2017
Crook County375%0.9Zone 2Radon test results from laboratories through 2017
Curry County617%0.9Zone 3Radon test results from laboratories through 2017
Deschutes County1594%0.7Zone 3Radon test results from laboratories through 2017
Douglas County349%0.6Zone 3Radon test results from laboratories through 2017
Gilliam County———Zone 2—
Grant County40%1.2Zone 2Radon test results from laboratories through 2017
Harney County520%0.7Zone 2Radon test results from laboratories through 2017
Hood River County13331%2.3Zone 2Radon test results from laboratories through 2017
Jackson County1135%1.0Zone 3Radon test results from laboratories through 2017
Jefferson County80%0.6Zone 2Radon test results from laboratories through 2017
Josephine County3010%0.7Zone 3Radon test results from laboratories through 2017
Klamath County385%0.4Zone 2Radon test results from laboratories through 2017
Lake County40%0.3Zone 2Radon test results from laboratories through 2017
Lane County4059%0.9Zone 3Radon test results from laboratories through 2017
Lincoln County3813%1.1Zone 3Radon test results from laboratories through 2017
Linn County1169%1.0Zone 3Radon test results from laboratories through 2017
Malheur County128%2.0Zone 2Radon test results from laboratories through 2017
Marion County1,39426%2.0Zone 3Radon test results from laboratories through 2017
Morrow County20%0.8Zone 2Radon test results from laboratories through 2017
Multnomah County12,33033%2.5Zone 2Radon test results from laboratories through 2017
Polk County57525%2.0Zone 3Radon test results from laboratories through 2017
Sherman County———Zone 2—
Tillamook County1331%1.0Zone 3Radon test results from laboratories through 2017
Umatilla County3412%1.9Zone 2Radon test results from laboratories through 2017
Union County11242%3.0Zone 2Radon test results from laboratories through 2017
Wallowa County1527%1.1Zone 3Radon test results from laboratories through 2017
Wasco County366%1.0Zone 2Radon test results from laboratories through 2017
Washington County3,33810%1.0Zone 2Radon test results from laboratories through 2017
Wheeler County20%0.1Zone 2Radon test results from laboratories through 2017
Yamhill County46526%1.5Zone 2Radon test results from laboratories through 2017

Test your home

County figures show how often tests come back high, not the level in your home. Only a test tells you that: see how to test for radon.

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