Radon Compass

Radon in Oklahoma

About 1 in 8 homes tested in Oklahoma were at or above the EPA action level of 4 pCi/L.

501 homes tested, 2008–2017
  • Below 2 pCi/L: 68%
  • 2 to 4 pCi/L: 19%
  • 4 pCi/L or more: 12%
The line marks the EPA action level, 4 pCi/L.

The EPA puts 0 of Oklahoma's 77 counties in Zone 1, its highest radon category, 9 in Zone 2 and 68 in Zone 3.

Every county in Oklahoma

Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.

CountyHomes testedAt or above 4MedianEPA zone
Alfalfa County1 tests––3
Choctaw County1 tests––3
Cimarron County1 tests––2
Texas County5 tests––2
Adair County2 tests––2
Delaware County
42%2.3 pCi/L2
Garfield County4 tests––3
McClain County2 tests––3
Dewey County3 tests––3
Mayes County2 tests––2
Cherokee County
31%1.9 pCi/L2
Kay County16 tests––3
Grant County5 tests––3
Canadian County8 tests––3
Rogers County15 tests––3
Carter County4 tests––3
Pottawatomie County6 tests––3
Comanche County6 tests––3
Oklahoma County
8%0.8 pCi/L3
Tulsa County
8%0.9 pCi/L3
Payne County10 tests––3
Muskogee County12 tests––3
Washington County14 tests––3
Beckham County2 tests––3
Bryan County1 tests––3
Cleveland County
0%1.0 pCi/L3
Craig County2 tests––3
Creek County8 tests––3
Custer County2 tests––3
Garvin County1 tests––3
Grady County3 tests––3
Haskell County1 tests––3
Hughes County2 tests––3
Jackson County3 tests––3
Jefferson County1 tests––3
Kingfisher County2 tests––3
Le Flore County6 tests––3
Lincoln County3 tests––3
Logan County7 tests––3
Major County1 tests––3
McCurtain County1 tests––3
McIntosh County2 tests––3
Okmulgee County1 tests––3
Osage County2 tests––3
Ottawa County2 tests––3
Pontotoc County3 tests––3
Roger Mills County1 tests––3
Sequoyah County3 tests––2
Stephens County1 tests––3
Wagoner County9 tests––3
Washita County2 tests––3
Woods County1 tests––3
Atoka CountyNo data––3
Beaver CountyNo data––2
Blaine CountyNo data––3
Caddo CountyNo data––3
Coal CountyNo data––3
Cotton CountyNo data––3
Ellis CountyNo data––2
Greer CountyNo data––3
Harmon CountyNo data––3
Harper CountyNo data––3
Johnston CountyNo data––3
Kiowa CountyNo data––3
Latimer CountyNo data––3
Love CountyNo data––3
Marshall CountyNo data––3
Murray CountyNo data––3
Noble CountyNo data––3
Nowata CountyNo data––3
Okfuskee CountyNo data––3
Pawnee CountyNo data––3
Pittsburg CountyNo data––3
Pushmataha CountyNo data––3
Seminole CountyNo data––3
Tillman CountyNo data––3
Woodward CountyNo data––3

"–" means fewer than 20 tests or no lab data, too few for a reliable figure.

Sources

Last updated October 2026. How we calculate these numbers.