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Oklahoma Radon Map and Levels by County

Oklahoma'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

    12.6%

    23.7 pts below U.S.

    Oklahoma
    12.6%
    U.S.
    36.3%

    860 tests across 53 counties, 2006 to 2015

  • Rank among states

    43 of 47

    Ten lowest states

    Oklahoma
    12.6%
    Nebraska
    59.7%

    By share, every state pooled the same way, 2006 to 2015

  • Counties in EPA Zone 1

    0 of 77

    None at highest potential

    Zone 1
    0
    Zone 2
    9

    Most counties sit in Zone 3; Zone 1 is the highest potential

  • Highest county

    44.7%

    Delaware County

    Delaware
    44.7%
    Tulsa
    6.0%

    Counties with 30+ tests, 2006 to 2015

Read a result for Oklahoma

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. 12.6% of Oklahoma's reported tests reached 4 pCi/L, 2006 to 2015.

Interpret this readingWhat a fix costs

The data

Oklahoma, At a glance

Oklahoma at a glance

Predicted: EPA radon zone

77 of 77 counties classified

EPA classifies counties, not states. Of the 77 counties in Oklahoma with a zone, 9 are in Zone 2 and 68 in Zone 3.

  • Zone 2: Moderate predicted potential2 to 4 pCi/L9 of 77 counties · 11.7%
  • Zone 3: Lower predicted potentialless than 2 pCi/L68 of 77 counties · 88.3%

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 Oklahoma's radon test figures by county: 55 of its 77 counties have one. Each one's share is in the county list.

How to read these figures

Oklahoma, Compared

Oklahoma radon figures, compared

Calculated by Radon411
Oklahoma, 2006 to 2015, laboratory
12.6%
of 860 tests at or above 4 pCi/L, pooled
Against the U.S.
−23.7points
36.3% pooled
Rank among the states
43 of 47
1 is the highest share
Counties with 30 or more tests
5
Highest
44.7%
Delaware County
Lowest
6.0%
Tulsa County

Fewer reported tests reach 4 pCi/L in Oklahoma than in most states: 12.6% of 860 over the 2006 to 2015 laboratory totals, from 53 counties. Nationally the pooled share is 36.3%: 23.7 points higher than here. Among 47 states pooled the same way it ranks 43rd, with Arizona (17.6%) above it and Texas (11.0%) below.

Delaware County reports the highest share (44.7% of 38 tests) and Tulsa County the lowest (6.0%); the most tests came from Tulsa County, 300 of them at 6.0%. EPA's 1993 map puts 0 of its 77 classified counties in Zone 1; the tests reported since bear that out at 12.6%.

By band, 2 counties at 30% to 50%, 3 counties at 5% to 15%. Across its 4 overlapping ten-year totals, the share went from 12.0% (2005 to 2014) to 12.7% (2008 to 2017), within 2 points, with 2008 to 2017 the highest at 12.7%.

Oklahoma ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2006 to 2015, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Alabama37 of 476113,46522.0%
Vermont38 of 47149,47421.8%
Alaska39 of 471172721.5%
South Carolina40 of 474623,86319.8%
Delaware41 of 4739,83617.6%
Arizona42 of 47123,18717.6%
Oklahoma43 of 475386012.6%
Texas44 of 471404,07311.0%
California45 of 47549,58110.6%
District of Columbia46 of 4711,9878.5%
Louisiana47 of 47374342.8%
Oklahoma's highest counties with 30 or more tests, by share at or above 4 pCi/L, 2006 to 2015, laboratory
CountyRankTestsAt or above 4 pCi/L
Delaware County1 of 53844.7%
Cherokee County2 of 55032.0%
Washington County3 of 55311.3%
Oklahoma County4 of 51358.9%
Tulsa County5 of 53006.0%
Oklahoma's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2006 to 2015, laboratory
ShareCountiesTheir testsFor example
50% or more00None
30% to 50%288Delaware County, Cherokee County
15% to 30%00None
5% to 15%3488Washington County, Oklahoma County, Tulsa County
Under 5%00None
Oklahoma ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 20175281412.7%35.7%+0.6 points
2007 to 20165285212.1%35.8%−0.5 points
2006 to 20155386012.6%36.3%+0.6 points
2005 to 20144981712.0%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.

Oklahoma, Counties

Oklahoma counties by EPA zone

Predicted

The map of Oklahoma, then its 77 counties zone by zone, each with its reported share at or above 4 pCi/L and a report of its own.

Oklahoma radon map by county: EPA radon zones. Map of Oklahoma's 77 counties shaded by EPA radon zone: Zone 2 in amber, Zone 3 in pale sand. 0 in Zone 1, 9 in Zone 2, 68 in Zone 3.
Oklahoma radon map by countyEPA radon zones for Oklahoma's counties: 0 counties in Zone 1, 9 counties in Zone 2, 68 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 5 highest in Oklahoma, 2006 to 2015

Zone 2: moderate predicted potential9

Local help

Oklahoma, Local resources

Local resources in Oklahoma

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

What it means

Oklahoma, Questions

Questions about radon in Oklahoma

Is radon a problem in Oklahoma?

Oklahoma has 77 counties on EPA's Map of Radon Zones: Zone 1, the highest predicted potential, for 0; Zone 2 for 9; Zone 3 for 68. Pooled from 53 counties, 12.6% of the 860 radon tests reported to CDC over the 2006 to 2015 laboratory totals were at or above 4 pCi/L, 43rd of 47 states.

Which Oklahoma counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2006 to 2015, laboratory: Delaware County 44.7% (38 tests), Cherokee County 32.0% (50 tests), Washington County 11.3% (53 tests), Oklahoma County 8.9% (135 tests), Tulsa County 6.0% (300 tests).

Which EPA region is Oklahoma in?

Oklahoma is in EPA Region 6: South Central.

Products

Oklahoma, Products

Testing a home in Oklahoma

12.6% of the 860 tests reported to CDC for Oklahoma over the 2006 to 2015 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 Oklahoma; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Oklahoma homes, compared

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