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Radon zones in Oklahoma

The EPA assigns every county in Oklahoma to one of three radon potential zones. No county in Oklahoma is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

77
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
9
Zone 2 counties
Predicted average 2-4 pCi/L
68
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Oklahoma

Every county in Oklahoma, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 9Zone 3 · 68

Hover a county · click to open it

County by county

All 77 Oklahoma counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Adair County220k11.7%25.8%69.2
Beaver County25,0188.5%15.3% -
Cherokee County248k8.9%18.9%54.3
Cimarron County22,1918.1%13.0% -
Delaware County242k11.5%20.5%41.7
Ellis County23,6489.5%16.4%49.6
Mayes County240k10.0%20.3%52.1
Sequoyah County240k11.5%22.8%67.1
Texas County220k7.2%16.0%29.2
Alfalfa County35,6738.5%17.9%50.5
Atoka County315k10.3%21.3%59.3
Beckham County322k9.5%20.0%50.7
Blaine County38,5399.4%17.6%44.7
Bryan County349k9.4%19.0%48.8
Caddo County326k9.5%21.5%60.7
Canadian County3176k5.9%13.4%33.3
Carter County349k8.8%18.0%49.2
Choctaw County314k11.5%21.5%56.9
Cleveland County3301k6.4%13.2%34.0
Coal County35,26612.4%23.1%66.1
Comanche County3122k7.5%17.6%45.4
Cotton County35,42710.5%19.3%59.3
Craig County314k11.2%22.2%41.0
Creek County373k8.9%18.4%53.3
Custer County328k7.5%15.4%36.8
Dewey County34,2869.2%17.5% -
Garfield County362k8.2%16.9%40.3
Garvin County326k9.6%19.2%50.7
Grady County357k7.9%16.3%49.2
Grant County34,0839.2%16.9% -
Greer County35,4668.4%17.9% -
Harmon County32,39210.1%17.8% -
Harper County33,1909.0%16.2% -
Haskell County312k10.8%20.7%70.9
Hughes County313k10.5%21.8%58.3
Jackson County325k7.9%16.1%39.2
Jefferson County35,34711.6%20.9%61.0
Johnston County310k10.8%21.0%59.1
Kay County344k9.6%18.7%53.8
Kingfisher County315k7.7%15.6%34.2
Kiowa County38,39811.4%19.9%63.2
Latimer County39,52612.1%22.4%41.5
Le Flore County350k10.8%21.9%55.2
Lincoln County335k9.8%18.9%46.5
Logan County353k7.4%15.3%35.4
Love County310k9.3%18.5%57.0
Major County37,5819.1%16.9%34.5
Marshall County316k10.5%18.7%57.1
McClain County347k7.1%15.4%41.8
McCurtain County331k10.5%21.2%69.9
McIntosh County320k12.4%21.8%63.2
Murray County314k9.5%17.9%68.5
Muskogee County367k10.1%20.7%55.5
Noble County311k8.8%16.8%48.2
Nowata County39,43810.2%20.3%54.2
Okfuskee County311k12.1%24.4%57.4
Oklahoma County3809k7.0%14.3%40.4
Okmulgee County337k9.9%20.0%59.0
Osage County346k9.2%17.9%36.0
Ottawa County330k10.7%21.3%71.1
Pawnee County316k9.9%19.3%54.5
Payne County383k6.7%14.0%41.2
Pittsburg County343k9.9%19.2%55.4
Pontotoc County338k7.9%16.5%42.7
Pottawatomie County374k8.9%18.1%55.4
Pushmataha County311k12.8%23.6%65.8
Roger Mills County33,2959.9%17.4%55.5
Rogers County3100k7.6%15.7%41.9
Seminole County324k11.4%22.5%57.0
Stephens County344k9.8%18.6%45.5
Tillman County36,8699.8%18.1%30.2
Tulsa County3683k7.2%14.7%36.6
Wagoner County389k7.4%15.5%36.1
Washington County354k8.8%16.9%47.4
Washita County311k9.3%17.5%31.5
Woods County38,5647.6%14.7%40.9
Woodward County320k8.2%16.9%37.8

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere