Radon Compass

Radon in Texas

About 1 in 9 homes tested in Texas were at or above the EPA action level of 4 pCi/L.

2,383 homes tested, 2008–2017
  • Below 2 pCi/L: 78%
  • 2 to 4 pCi/L: 10%
  • 4 pCi/L or more: 11%
The line marks the EPA action level, 4 pCi/L.

The EPA puts 0 of Texas's 254 counties in Zone 1, its highest radon category, 39 in Zone 2 and 215 in Zone 3.

Every county in Texas

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
Carson County1 tests––2
Collingsworth County1 tests––3
Dallam County1 tests––2
Donley County1 tests––2
Hopkins County1 tests––3
Lipscomb County1 tests––2
Moore County2 tests––2
Ochiltree County1 tests––2
Parmer County1 tests––2
Polk County1 tests––3
Scurry County1 tests––3
Stephens County1 tests––3
Swisher County2 tests––2
Deaf Smith County4 tests––2
Hale County8 tests––2
Burnet County4 tests––3
Kendall County4 tests––3
Randall County
69%6.1 pCi/L2
Ellis County4 tests––3
Bastrop County5 tests––3
Lubbock County
56%4.8 pCi/L2
Brewster County4 tests––2
Hartley County2 tests––2
Matagorda County3 tests––3
San Jacinto County1 tests––3
Tom Green County5 tests––3
Jeff Davis County4 tests––2
Dawson County1 tests––3
Hunt County3 tests––3
McLennan County14 tests––3
Potter County
23%1.4 pCi/L2
Hutchinson County4 tests––2
Rockwall County8 tests––3
Hays County7 tests––3
Bell County
17%1.3 pCi/L3
Gillespie County5 tests––3
Tarrant County
13%0.9 pCi/L3
Montague County5 tests––3
Parker County17 tests––3
Travis County
9%0.9 pCi/L3
Dallas County
8%0.9 pCi/L3
Collin County
8%1.0 pCi/L3
Taylor County10 tests––3
Denton County
7%0.9 pCi/L3
Bexar County
7%0.6 pCi/L3
Brazoria County
6%0.3 pCi/L3
Smith County
6%0.8 pCi/L3
Grayson County12 tests––3
Comal County10 tests––3
Jefferson County11 tests––3
Montgomery County
3%0.8 pCi/L3
Fort Bend County
3%0.2 pCi/L3
Harris County
3%0.4 pCi/L3
Williamson County
2%0.7 pCi/L3
Midland County
1%0.7 pCi/L3
Angelina County3 tests––3
Aransas County2 tests––3
Atascosa County1 tests––3
Austin County2 tests––3
Blanco County2 tests––3
Brazos County12 tests––3
Brown County2 tests––3
Caldwell County2 tests––3
Cameron County6 tests––3
Cass County1 tests––3
Castro County1 tests––2
Chambers County3 tests––3
Cherokee County1 tests––3
Childress County1 tests––3
Colorado County1 tests––3
Cooke County1 tests––3
Coryell County2 tests––3
DeWitt County1 tests––3
Eastland County2 tests––3
Ector County8 tests––3
El Paso County
0%0.7 pCi/L3
Fannin County1 tests––3
Fayette County3 tests––3
Freestone County5 tests––3
Galveston County
0%0.2 pCi/L3
Gonzales County1 tests––3
Gray County2 tests––2
Gregg County9 tests––3
Grimes County1 tests––3
Guadalupe County2 tests––3
Hamilton County1 tests––3
Hardin County3 tests––3
Harrison County2 tests––3
Hemphill County1 tests––2
Henderson County1 tests––3
Hidalgo County7 tests––3
Hill County4 tests––3
Hood County5 tests––3
Houston County1 tests––3
Howard County1 tests––3
Jackson County1 tests––3
Jasper County1 tests––3
Jim Wells County1 tests––3
Johnson County14 tests––3
Jones County1 tests––3
Kaufman County5 tests––3
Kerr County4 tests––3
Kimble County1 tests––3
Lamar County1 tests––3
Lavaca County2 tests––3
Liberty County1 tests––3
Llano County5 tests––2
Madison County1 tests––3
Maverick County1 tests––3
Medina County2 tests––3
Morris County1 tests––3
Nacogdoches County1 tests––3
Navarro County4 tests––3
Nolan County2 tests––3
Nueces County16 tests––3
Orange County9 tests––3
Panola County1 tests––3
Refugio County1 tests––3
Robertson County2 tests––3
Runnels County1 tests––3
Rusk County2 tests––3
Shackelford County1 tests––3
Sherman County1 tests––2
Starr County1 tests––3
Upshur County5 tests––3
Van Zandt County3 tests––3
Victoria County3 tests––3
Walker County3 tests––3
Waller County3 tests––3
Washington County1 tests––3
Webb County5 tests––3
Wharton County1 tests––3
Wheeler County2 tests––3
Wichita County5 tests––3
Wilbarger County1 tests––3
Wilson County1 tests––3
Wise County2 tests––3
Yoakum County1 tests––3
Zapata County1 tests––3
Anderson CountyNo data––3
Andrews CountyNo data––3
Archer CountyNo data––3
Armstrong CountyNo data––2
Bailey CountyNo data––2
Bandera CountyNo data––3
Baylor CountyNo data––3
Bee CountyNo data––3
Borden CountyNo data––3
Bosque CountyNo data––3
Bowie CountyNo data––3
Briscoe CountyNo data––3
Brooks CountyNo data––3
Burleson CountyNo data––3
Calhoun CountyNo data––3
Callahan CountyNo data––3
Camp CountyNo data––3
Clay CountyNo data––3
Cochran CountyNo data––3
Coke CountyNo data––3
Coleman CountyNo data––3
Comanche CountyNo data––3
Concho CountyNo data––3
Cottle CountyNo data––3
Crane CountyNo data––3
Crockett CountyNo data––3
Crosby CountyNo data––2
Culberson CountyNo data––2
Delta CountyNo data––3
Dickens CountyNo data––3
Dimmit CountyNo data––3
Duval CountyNo data––3
Edwards CountyNo data––3
Erath CountyNo data––3
Falls CountyNo data––3
Fisher CountyNo data––3
Floyd CountyNo data––2
Foard CountyNo data––3
Franklin CountyNo data––3
Frio CountyNo data––3
Gaines CountyNo data––3
Garza CountyNo data––2
Glasscock CountyNo data––3
Goliad CountyNo data––3
Hall CountyNo data––3
Hansford CountyNo data––2
Hardeman CountyNo data––3
Haskell CountyNo data––3
Hockley CountyNo data––2
Hudspeth CountyNo data––2
Irion CountyNo data––3
Jack CountyNo data––3
Jim Hogg CountyNo data––3
Karnes CountyNo data––3
Kenedy CountyNo data––3
Kent CountyNo data––3
King CountyNo data––3
Kinney CountyNo data––3
Kleberg CountyNo data––3
Knox CountyNo data––3
La Salle CountyNo data––3
Lamb CountyNo data––2
Lampasas CountyNo data––3
Lee CountyNo data––3
Leon CountyNo data––3
Limestone CountyNo data––3
Live Oak CountyNo data––3
Loving CountyNo data––3
Lynn CountyNo data––2
Marion CountyNo data––3
Martin CountyNo data––3
Mason CountyNo data––2
McCulloch CountyNo data––3
McMullen CountyNo data––3
Menard CountyNo data––3
Milam CountyNo data––3
Mills CountyNo data––3
Mitchell CountyNo data––3
Motley CountyNo data––3
Newton CountyNo data––3
Oldham CountyNo data––2
Palo Pinto CountyNo data––3
Pecos CountyNo data––3
Presidio CountyNo data––2
Rains CountyNo data––3
Reagan CountyNo data––3
Real CountyNo data––3
Red River CountyNo data––3
Reeves CountyNo data––2
Roberts CountyNo data––2
Sabine CountyNo data––3
San Augustine CountyNo data––3
San Patricio CountyNo data––3
San Saba CountyNo data––3
Schleicher CountyNo data––3
Shelby CountyNo data––3
Somervell CountyNo data––3
Sterling CountyNo data––3
Stonewall CountyNo data––3
Sutton CountyNo data––3
Terrell CountyNo data––2
Terry CountyNo data––3
Throckmorton CountyNo data––3
Titus CountyNo data––3
Trinity CountyNo data––3
Tyler CountyNo data––3
Upton CountyNo data––3
Uvalde CountyNo data––3
Val Verde CountyNo data––3
Ward CountyNo data––3
Willacy CountyNo data––3
Winkler CountyNo data––3
Wood CountyNo data––3
Young CountyNo data––3
Zavala 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.