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Oregon Radon Map and Levels by County

Oregon's counties span EPA Zones 2 and 3. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    25.4%

    10.3 pts below U.S.

    Oregon
    25.4%
    U.S.
    35.7%

    23,951 tests across 34 counties, 2008 to 2017

  • Rank among states

    27 of 47

    Middle of the states

    Oregon
    25.4%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    0 of 36

    None at highest potential

    Zone 1
    0
    Zone 2
    21

    Most counties sit in Zone 2; Zone 1 is the highest potential

  • Highest county

    42.0%

    Union County

    Union
    42.0%
    Deschutes
    3.8%

    Counties with 30+ tests, 2008 to 2017

Read a result for Oregon

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 25.4% of Oregon's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Oregon, At a glance

Oregon at a glance

Predicted: EPA radon zone

36 of 36 counties classified

EPA classifies counties, not states. Of the 36 counties in Oregon with a zone, 21 are in Zone 2 and 15 in Zone 3.

  • Zone 2: Moderate predicted potential2 to 4 pCi/L21 of 36 counties · 58.3%
  • Zone 3: Lower predicted potentialless than 2 pCi/L15 of 36 counties · 41.7%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Oregon's radon test figures by county: 36 of its 36 counties have one. Each one's share is in the county list.

How to read these figures

Oregon, Compared

Oregon radon figures, compared

Calculated by Radon411
Oregon, 2008 to 2017, laboratory
25.4%
of 23,951 tests at or above 4 pCi/L, pooled
Against the U.S.
−10.3points
35.7% pooled
Rank among the states
27 of 47
1 is the highest share
Counties with 30 or more tests
23
Highest
42.0%
Union County
Lowest
3.8%
Deschutes County

About 3 in 10 of the 23,951 tests reported for Oregon over the 2008 to 2017 laboratory totals came back at or above 4 pCi/L (25.4%, 34 counties pooled). That is 27th of 47 states with county figures for the period; Washington (25.5%) above it and Georgia (24.8%) below.

By band, 6 counties at 30% to 50%, 4 counties at 15% to 30%, 12 counties at 5% to 15%, 1 county at under 5%. Its 23 counties with 30 or more tests run from 3.8% in Deschutes County to 42.0% in Union County; in 0 of them half or more of the reported tests reached 4 pCi/L.

EPA's 1993 map puts 0 of its 36 classified counties in Zone 1; the tests reported since bear that out at 25.4%. The national pool for the same period is 35.7%, so Oregon runs 10.3 points below the country.

Across its 4 overlapping ten-year totals, the share went from 27.2% (2005 to 2014) to 25.4% (2008 to 2017), within 2 points, with 2005 to 2014 the highest at 27.2%.

Oregon ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Virginia22 of 4713153,19930.4%
New Mexico23 of 47293,72128.5%
Michigan24 of 4783114,40726.9%
Connecticut25 of 47825,57226.5%
Washington26 of 47398,20125.5%
Oregon27 of 473423,95125.4%
Georgia28 of 4712930,15224.8%
New York29 of 476297,14524.5%
Maryland30 of 472447,94123.9%
Massachusetts31 of 4714234,15223.8%
Rhode Island32 of 47537,87423.8%
Oregon's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Union County1 of 2311242.0%
Clatsop County2 of 235540.0%
Baker County3 of 234037.5%
Columbia County4 of 2321236.8%
Multnomah County5 of 2312,33033.1%
Hood River County6 of 2313330.8%
Yamhill County7 of 2346526.2%
Marion County8 of 231,39426.0%
Polk County9 of 2357525.2%
Clackamas County10 of 233,80218.0%
Deschutes County23 of 231593.8%
Klamath County22 of 23385.3%
Jackson County21 of 231135.3%
Crook County20 of 23375.4%
Wasco County19 of 23365.6%
Oregon's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more00None
30% to 50%612,882Union County, Clatsop County, Baker County
15% to 30%46,236Yamhill County, Marion County, Polk County
5% to 15%124,585Lincoln County, Benton County, Umatilla County
Under 5%1159Deschutes County
Oregon ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 20173423,95125.4%35.7%−0.9 points
2007 to 20163422,26126.3%35.8%−0.6 points
2006 to 20153419,65726.9%36.3%−0.3 points
2005 to 20143417,18327.2%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Oregon, Counties

Oregon counties by EPA zone

Predicted

Oregon's radon map, then all 36 counties by EPA's zone, the highest reported share of tests at or above 4 pCi/L first; each has its own report.

Oregon radon map by county: EPA radon zones. Map of Oregon's 36 counties shaded by EPA radon zone: Zone 2 in amber, Zone 3 in pale sand. 0 in Zone 1, 21 in Zone 2, 15 in Zone 3.
Oregon radon map by countyEPA radon zones for Oregon's counties: 0 counties in Zone 1, 21 counties in Zone 2, 15 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Oregon, 2008 to 2017

Zone 2: moderate predicted potential21

Local help

Oregon, Local resources

Local resources in Oregon

Who to ask in Oregon: its radon program, test kits and professionals.

What Oregon's program says
Email
Radon.program@dhsoha.state.or.us

What it means

Oregon, Questions

Questions about radon in Oregon

Is radon a problem in Oregon?

EPA's Map of Radon Zones places 0 of the 36 Oregon counties it classifies in Zone 1, the highest predicted potential, 21 in Zone 2 and 15 in Zone 3. Pooled from 34 counties, 25.4% of the 23,951 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 27th of 47 states.

Who does radon mitigation in Oregon?

Radon411's Oregon directory lists 38 radon businesses for testing, mitigation or both, each with the licensing list it was read from.

Which Oregon counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory: Union County 42.0% (112 tests), Clatsop County 40.0% (55 tests), Baker County 37.5% (40 tests), Columbia County 36.8% (212 tests), Multnomah County 33.1% (12,330 tests).

Which EPA region is Oregon in?

Oregon is in EPA Region 10: Pacific Northwest.

Products

Oregon, Products

Testing a home in Oregon

25.4% of the 23,951 tests reported to CDC for Oregon over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Oregon; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Oregon homes, compared

Explore

Cities in Oregon with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.