Radon levels in Oklahoma: Low
The model predicts a population-weighted basement average of 1.8 pCi/L (model estimate) across Oklahoma's 77 counties - close to the US average of 1.8 pCi/L. Above-ground floors average 0.9 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
0 / 77
EPA Zone 1 counties (0%)
9 / 68
Zone 2 / Zone 3 counties
0
counties predicted ≥ 4 pCi/L
0%
of ZIP codes predicted ≥ 4 pCi/L
Test Oklahoma once anyway - radon varies house to house
The predicted basement average here is 1.8 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.
Monitor link goes to the Airthings store - use code RADONGRADE-10OFF at checkout for 10% off any Airthings monitor.
Affiliate links: we may earn a commission from Airthings or Amazon at no extra cost to you.
What the data says about radon in Oklahoma
According to the EPA zone map, 0 of Oklahoma's 77 counties are EPA Zone 1 (0%), 9 are Zone 2 and 68 are Zone 3. Most counties fall in Zone 3, the EPA's lowest-potential class (predicted screening average under 2 pCi/L). Treat the map as a coarse prior: it predates two decades of test data and never replaces a test in your own home.
The 2001-2021 national model predicts a population-weighted basement average of 1.8 pCi/L for Oklahoma (low range, close to the US average of 1.8). Of the 77 counties with predictions, 0 are predicted at or above 4 pCi/L, 18 in the 2-4 band and 59 below 2. The county range is narrow: from Comanche County at 1.59 to Cimarron County at 2.50 pCi/L, a spread of only 0.91.
20.5% of the state's modeled ZIP codes are predicted at or above 2 pCi/L, and 0% at or above the 4 pCi/L action level - below the national shares of 4.2% and 48.7%. No ZIP in the state is predicted above 4 on average - but averages hide individual homes, which is why the EPA still asks everyone to test.
Oklahoma counties by predicted radon
Sorted highest to lowest predicted basement average (model estimate). 77 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| Cimarron County | 2.5 pCi/L | 1.5 | Moderate | EPA Zone 2 | 4 |
| Texas County | 2.4 pCi/L | 1.2 | Moderate | EPA Zone 2 | 6 |
| Beaver County | 2.4 pCi/L | 1.3 | Moderate | EPA Zone 2 | 6 |
| Roger Mills County | 2.3 pCi/L | 1.2 | Moderate | EPA Zone 3 | 7 |
| Harper County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 3 | 2 |
| Dewey County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 3 | 7 |
| Ellis County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 2 | 6 |
| Delaware County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 2 | 9 |
| Adair County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 2 | 4 |
| Cherokee County | 2.2 pCi/L | 1.3 | Moderate | EPA Zone 2 | 7 |
| Woodward County | 2.1 pCi/L | 1.0 | Moderate | EPA Zone 3 | 4 |
| Alfalfa County | 2.0 pCi/L | 1.0 | Moderate | EPA Zone 3 | 7 |
| Grant County | 2.0 pCi/L | 1.0 | Moderate | EPA Zone 3 | 7 |
| Harmon County | 2.0 pCi/L | 1.0 | Moderate | EPA Zone 3 | 3 |
| Love County | 2.0 pCi/L | 0.9 | Moderate | EPA Zone 3 | 5 |
| Beckham County | 2.0 pCi/L | 0.9 | Moderate | EPA Zone 3 | 4 |
| Blaine County | 2.0 pCi/L | 1.0 | Moderate | EPA Zone 3 | 7 |
| Caddo County | 2.0 pCi/L | 1.0 | Moderate | EPA Zone 3 | 11 |
| Kingfisher County | 2.0 pCi/L | 1.0 | Low | EPA Zone 3 | 6 |
| Carter County | 2.0 pCi/L | 0.9 | Low | EPA Zone 3 | 8 |
| Custer County | 2.0 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| Kay County | 2.0 pCi/L | 1.0 | Low | EPA Zone 3 | 7 |
| Washita County | 2.0 pCi/L | 1.0 | Low | EPA Zone 3 | 9 |
| Marshall County | 2.0 pCi/L | 0.9 | Low | EPA Zone 3 | 3 |
| Noble County | 2.0 pCi/L | 1.0 | Low | EPA Zone 3 | 7 |
| Woods County | 2.0 pCi/L | 1.0 | Low | EPA Zone 3 | 5 |
| Lincoln County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 10 |
| Major County | 1.9 pCi/L | 1.0 | Low | EPA Zone 3 | 7 |
| Murray County | 1.9 pCi/L | 0.8 | Low | EPA Zone 3 | 2 |
| Kiowa County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Pawnee County | 1.9 pCi/L | 1.0 | Low | EPA Zone 3 | 4 |
| Craig County | 1.9 pCi/L | 1.0 | Low | EPA Zone 3 | 4 |
| Garvin County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Mayes County | 1.9 pCi/L | 0.9 | Low | EPA Zone 2 | 7 |
| Pontotoc County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| McClain County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 5 |
| Ottawa County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| Seminole County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 5 |
| Garfield County | 1.9 pCi/L | 1.0 | Low | EPA Zone 3 | 14 |
| Sequoyah County | 1.9 pCi/L | 1.0 | Low | EPA Zone 2 | 6 |
| Jackson County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Logan County | 1.9 pCi/L | 1.0 | Low | EPA Zone 3 | 6 |
| Greer County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 3 |
| Latimer County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 3 |
| Pottawatomie County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 8 |
| Tillman County | 1.9 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| Creek County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 9 |
| Grady County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 11 |
| Le Flore County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 15 |
| Cotton County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Hughes County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 7 |
| Nowata County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 5 |
| Rogers County | 1.8 pCi/L | 1.0 | Low | EPA Zone 3 | 7 |
| Payne County | 1.8 pCi/L | 1.0 | Low | EPA Zone 3 | 7 |
| Stephens County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Haskell County | 1.8 pCi/L | 1.0 | Low | EPA Zone 3 | 5 |
| Okfuskee County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 5 |
| Bryan County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 9 |
| Canadian County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Jefferson County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Pushmataha County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 9 |
| Washington County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 5 |
| Atoka County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| Pittsburg County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| McCurtain County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 11 |
| Osage County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 16 |
| Wagoner County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 4 |
| Okmulgee County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 5 |
| Muskogee County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 11 |
| Choctaw County | 1.7 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| McIntosh County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 4 |
| Johnston County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Cleveland County | 1.7 pCi/L | 0.8 | Low | EPA Zone 3 | 11 |
| Coal County | 1.7 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| Oklahoma County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 50 |
| Tulsa County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 33 |
| Comanche County | 1.6 pCi/L | 0.6 | Low | EPA Zone 3 | 10 |
Radon levels in Oklahoma cities
The 10 most-populous Oklahoma places among the 1,000 largest US cities (Census incorporated places and CDPs), by population. City figures are ZIP-land-weighted means of the model's ZIP predictions (model estimate).
| City | Population | Predicted basement | Upstairs | Grade | ZIPs ≥ 4 |
|---|---|---|---|---|---|
| Oklahoma City | 702,767 | 1.7 pCi/L | 0.9 | Low | 0% |
| Tulsa | 411,894 | 1.6 pCi/L | 0.8 | Low | 0% |
| Norman | 130,046 | 1.7 pCi/L | 0.8 | Low | 0% |
| Broken Arrow | 119,194 | 1.7 pCi/L | 0.9 | Low | 0% |
| Edmond | 98,103 | 1.7 pCi/L | 0.9 | Low | 0% |
| Lawton | 90,245 | 1.5 pCi/L | 0.6 | Low | 0% |
| Moore | 63,470 | 1.7 pCi/L | 0.9 | Low | 0% |
| Midwest City | 58,086 | 1.6 pCi/L | 0.8 | Low | 0% |
| Enid | 50,577 | 1.9 pCi/L | 0.9 | Low | 0% |
| Stillwater | 49,525 | 1.8 pCi/L | 1.0 | Low | 0% |
Highest-radon ZIP codes in Oklahoma
The 10 Oklahoma ZIP codes with the highest predicted basement average (model estimate), out of 581 modeled. A ZIP average is still an area figure - neighboring homes routinely test several pCi/L apart.
| ZIP | County | Predicted basement | Upstairs | Grade |
|---|---|---|---|---|
| 73946 | Cimarron County | 3.1 pCi/L | 1.6 | Moderate |
| 73932 | Beaver County | 2.6 pCi/L | 1.6 | Moderate |
| 73933 | Cimarron County | 2.6 pCi/L | 1.6 | Moderate |
| 73859 | Dewey County | 2.5 pCi/L | 1.2 | Moderate |
| 73931 | Beaver County | 2.5 pCi/L | 1.5 | Moderate |
| 73942 | Texas County | 2.4 pCi/L | 1.2 | Moderate |
| 73660 | Roger Mills County | 2.4 pCi/L | 1.2 | Moderate |
| 73840 | Ellis County | 2.4 pCi/L | 1.2 | Moderate |
| 73638 | Roger Mills County | 2.4 pCi/L | 1.1 | Moderate |
| 73945 | Texas County | 2.3 pCi/L | 1.3 | Moderate |
Oklahoma radon questions
- Is radon high in Oklahoma?
- Oklahoma's population-weighted predicted basement average is 1.8 pCi/L, close to the US average of 1.8. 0 of its 77 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 18 are in the 2-4 "consider fixing" range and 59 are below 2. 0% of Oklahoma ZIP codes are predicted at 4 or higher.
- Which Oklahoma county has the highest radon?
- Cimarron County has the highest predicted basement average in Oklahoma at 2.5 pCi/L (EPA Zone 2). The lowest is Comanche County at 1.6 pCi/L. These are area figures; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in Oklahoma?
- 0 of Oklahoma's 77 counties (0%) are EPA Zone 1 (highest potential), 9 are Zone 2 and 68 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in Oklahoma?
- Yes. Even though Oklahoma's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 20.5% of Oklahoma ZIP codes are still predicted at 2 pCi/L or higher.
Oklahoma radon program
State programs keep lists of certified testers and mitigators and sometimes run kit programs. We link only pages we could verify, and Oklahoma's program page did not respond when we checked, so start from the EPA state radon contacts page. Then read how to test and what mitigation costs.