Oklahoma Radon Levels
0Zone 1 (High)
9Zone 2 (Moderate)
68Zone 3 (Low)
No counties in Oklahoma are classified as Zone 1 (highest risk), but 9 counties are Zone 2 (moderate potential). The EPA recommends testing all homes regardless of zone classification, as elevated radon can occur in any zone.
| County | EPA Zone | Risk Level |
|---|---|---|
| Adair County | Zone 2 | Moderate Potential |
| Alfalfa County | Zone 3 | Lowest Potential |
| Atoka County | Zone 3 | Lowest Potential |
| Beaver County | Zone 2 | Moderate Potential |
| Beckham County | Zone 3 | Lowest Potential |
| Blaine County | Zone 3 | Lowest Potential |
| Bryan County | Zone 3 | Lowest Potential |
| Caddo County | Zone 3 | Lowest Potential |
| Canadian County | Zone 3 | Lowest Potential |
| Carter County | Zone 3 | Lowest Potential |
| Cherokee County | Zone 2 | Moderate Potential |
| Choctaw County | Zone 3 | Lowest Potential |
| Cimarron County | Zone 2 | Moderate Potential |
| Cleveland County | Zone 3 | Lowest Potential |
| Coal County | Zone 3 | Lowest Potential |
| Comanche County | Zone 3 | Lowest Potential |
| Cotton County | Zone 3 | Lowest Potential |
| Craig County | Zone 3 | Lowest Potential |
| Creek County | Zone 3 | Lowest Potential |
| Custer County | Zone 3 | Lowest Potential |
| Delaware County | Zone 2 | Moderate Potential |
| Dewey County | Zone 3 | Lowest Potential |
| Ellis County | Zone 2 | Moderate Potential |
| Garfield County | Zone 3 | Lowest Potential |
| Garvin County | Zone 3 | Lowest Potential |
| Grady County | Zone 3 | Lowest Potential |
| Grant County | Zone 3 | Lowest Potential |
| Greer County | Zone 3 | Lowest Potential |
| Harmon County | Zone 3 | Lowest Potential |
| Harper County | Zone 3 | Lowest Potential |
| Haskell County | Zone 3 | Lowest Potential |
| Hughes County | Zone 3 | Lowest Potential |
| Jackson County | Zone 3 | Lowest Potential |
| Jefferson County | Zone 3 | Lowest Potential |
| Johnston County | Zone 3 | Lowest Potential |
| Kay County | Zone 3 | Lowest Potential |
| Kingfisher County | Zone 3 | Lowest Potential |
| Kiowa County | Zone 3 | Lowest Potential |
| Latimer County | Zone 3 | Lowest Potential |
| Le Flore County | Zone 3 | Lowest Potential |
| Lincoln County | Zone 3 | Lowest Potential |
| Logan County | Zone 3 | Lowest Potential |
| Love County | Zone 3 | Lowest Potential |
| McClain County | Zone 3 | Lowest Potential |
| McCurtain County | Zone 3 | Lowest Potential |
| McIntosh County | Zone 3 | Lowest Potential |
| Major County | Zone 3 | Lowest Potential |
| Marshall County | Zone 3 | Lowest Potential |
| Mayes County | Zone 2 | Moderate Potential |
| Murray County | Zone 3 | Lowest Potential |
| Muskogee County | Zone 3 | Lowest Potential |
| Noble County | Zone 3 | Lowest Potential |
| Nowata County | Zone 3 | Lowest Potential |
| Okfuskee County | Zone 3 | Lowest Potential |
| Oklahoma County | Zone 3 | Lowest Potential |
| Okmulgee County | Zone 3 | Lowest Potential |
| Osage County | Zone 3 | Lowest Potential |
| Ottawa County | Zone 3 | Lowest Potential |
| Pawnee County | Zone 3 | Lowest Potential |
| Payne County | Zone 3 | Lowest Potential |
| Pittsburg County | Zone 3 | Lowest Potential |
| Pontotoc County | Zone 3 | Lowest Potential |
| Pottawatomie County | Zone 3 | Lowest Potential |
| Pushmataha County | Zone 3 | Lowest Potential |
| Roger Mills County | Zone 3 | Lowest Potential |
| Rogers County | Zone 3 | Lowest Potential |
| Seminole County | Zone 3 | Lowest Potential |
| Sequoyah County | Zone 2 | Moderate Potential |
| Stephens County | Zone 3 | Lowest Potential |
| Texas County | Zone 2 | Moderate Potential |
| Tillman County | Zone 3 | Lowest Potential |
| Tulsa County | Zone 3 | Lowest Potential |
| Wagoner County | Zone 3 | Lowest Potential |
| Washington County | Zone 3 | Lowest Potential |
| Washita County | Zone 3 | Lowest Potential |
| Woods County | Zone 3 | Lowest Potential |
| Woodward County | Zone 3 | Lowest Potential |