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Radon in Oklahoma: radon map by county

EPA's Map of Radon Zones puts 0 of Oklahoma's 77 counties in Zone 1 (predicted average indoor radon above 4 pCi/L), 9 in Zone 2 and 68 in Zone 3. Of 501 building tests that radon laboratories reported for 2008 to 2017, 12.5% were at or above EPA's 4 pCi/L action level, against 36.5% nationally. The highest county share is Delaware County (41.9% of 20 tests).

0
counties in Zone 1 (above 4 pCi/L predicted)
9
counties in Zone 2 (2 to 4)
68
counties in Zone 3 (below 2)
12.5%
of 501 lab tests at or above 4 pCi/L

Radon by county in Oklahoma

EPA radon zone and radon test results for each county in Oklahoma
CountyEPA zoneLab testsMedian4+ pCi/L
Adair County Zone 223.850%
Alfalfa County Zone 3129.3100%
Atoka County Zone 3n/an/an/a
Beaver County Zone 2n/an/an/a
Beckham County Zone 321.80%
Blaine County Zone 3n/an/an/a
Bryan County Zone 310.60%
Caddo County Zone 3n/an/an/a
Canadian County Zone 380.619%
Carter County Zone 341.214.3%
Cherokee County Zone 2321.931.4%
Choctaw County Zone 314.8100%
Cimarron County Zone 214.766.7%
Cleveland County Zone 3211.00%
Coal County Zone 3n/an/an/a
Comanche County Zone 360.610%
Cotton County Zone 3n/an/an/a
Craig County Zone 322.60%
Creek County Zone 380.80%
Custer County Zone 322.30%
Delaware County Zone 2202.341.9%
Dewey County Zone 333.333.3%
Ellis County Zone 2n/an/an/a
Garfield County Zone 342.340%
Garvin County Zone 311.90%
Grady County Zone 331.00%
Grant County Zone 352.525%
Greer County Zone 3n/an/an/a
Harmon County Zone 3n/an/an/a
Harper County Zone 3n/an/an/a
Haskell County Zone 310.70%
Hughes County Zone 321.10%
Jackson County Zone 330.60%
Jefferson County Zone 310.10%
Johnston County Zone 3n/an/an/a
Kay County Zone 3161.928%
Kingfisher County Zone 321.20%
Kiowa County Zone 3n/an/an/a
Latimer County Zone 3n/an/an/a
Le Flore County Zone 360.80%
Lincoln County Zone 331.00%
Logan County Zone 371.10%
Love County Zone 3n/an/an/a
Major County Zone 312.20%
Marshall County Zone 3n/an/an/a
Mayes County Zone 223.833.3%
McClain County Zone 321.740%
McCurtain County Zone 311.90%
McIntosh County Zone 321.30%
Murray County Zone 3n/an/an/a
Muskogee County Zone 3121.35.9%
Noble County Zone 3n/an/an/a
Nowata County Zone 3n/an/an/a
Okfuskee County Zone 3n/an/an/a
Oklahoma County Zone 3700.88.4%
Okmulgee County Zone 312.10%
Osage County Zone 320.90%
Ottawa County Zone 320.20%
Pawnee County Zone 3n/an/an/a
Payne County Zone 3100.76.7%
Pittsburg County Zone 3n/an/an/a
Pontotoc County Zone 330.60%
Pottawatomie County Zone 360.111.1%
Pushmataha County Zone 3n/an/an/a
Roger Mills County Zone 313.20%
Rogers County Zone 3150.814.8%
Seminole County Zone 3n/an/an/a
Sequoyah County Zone 231.60%
Stephens County Zone 310.80%
Texas County Zone 254.966.7%
Tillman County Zone 3n/an/an/a
Tulsa County Zone 31680.98.2%
Wagoner County Zone 391.10%
Washington County Zone 3141.64.3%
Washita County Zone 322.80%
Woods County Zone 311.80%
Woodward County Zone 3n/an/an/a

Lab tests: buildings tested by radon laboratories, 2008 to 2017; median in pCi/L; “4+ pCi/L” is the share of tests at or above EPA's action level. n/a: no value on file (no tests, or too few to report).

What the zones mean

Zone 1 counties have a predicted average indoor radon screening level above 4 pCi/L, Zone 2 from 2 to 4 pCi/L and Zone 3 below 2 pCi/L. The prediction is from 1993 indoor measurements, geology, aerial radioactivity, soils and foundation types. EPA: “This map should not be used to determine if individual homes need to be tested.” EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of exposure.

Check one Oklahoma address

Environmental Records Report, $29. PDF and JSON, usually ready in about a minute.

Radon in Oklahoma: questions

What radon zone is Oklahoma?

EPA's 1993 map does not give states one zone; it zones each county. In Oklahoma, 0 counties are Zone 1, 9 Zone 2 and 68 Zone 3. EPA says the map "should not be used to determine if individual homes need to be tested".

Which Oklahoma counties have the highest radon levels?

By the share of laboratory tests at or above 4 pCi/L for 2008 to 2017 (counties with 20 or more tests): Delaware County 41.9% (median 2.3 pCi/L, 20 tests); Cherokee County 31.4% (median 1.9 pCi/L, 32 tests); Oklahoma County 8.4% (median 0.8 pCi/L, 70 tests); Tulsa County 8.2% (median 0.9 pCi/L, 168 tests); Cleveland County 0% (median 1.0 pCi/L, 21 tests).

How common is high radon in Oklahoma?

12.5% of the 501 tests in the laboratory data for Oklahoma (2008 to 2017) were at or above 4 pCi/L; the national share was 36.5%. Buildings are tested by choice, often because of a sale or a concern, so the share describes the tests on file, not every home.

Should I test for radon in Oklahoma?

Yes. EPA recommends testing every home no matter where it is, fixing it at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of radon exposure.

States bordering Oklahoma

Radon in Arkansas (0 of 75 in Zone 1)Radon in Colorado (53 of 64 in Zone 1)Radon in Kansas (65 of 105 in Zone 1)Radon in Missouri (11 of 115 in Zone 1)Radon in New Mexico (7 of 33 in Zone 1)Radon in Texas (0 of 254 in Zone 1)

Other free hazard lookups

All of these, plus wetlands, FEMA hazard ratings and the federal contamination lists, are in the Environmental Records Report for any US address ($29).

Superfund sites in Oklahoma · Radon map of every state

Data compiled 2026-10-20. County-level screening information, not a radon measurement of any building.