Radon Levels in Texas

254 counties — 0 high risk, 39 moderate, 215 low risk

39
215
Zone 1 High (0.0%) Zone 2 Moderate (15.4%) Zone 3 Low (84.6%)

Texas Radon Zone Map

Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.

All 254 Counties — By Radon Risk

CountyEPA ZoneTests% Above 4 pCi/L
Armstrong Moderate
Bailey Moderate
Brewster Moderate
Carson Moderate
Castro Moderate
Crosby Moderate
Culberson Moderate
Dallam Moderate
Deaf Smith Moderate
Donley Moderate
Floyd Moderate
Garza Moderate
Gray Moderate 4
Hale Moderate 5
Hansford Moderate
Hartley Moderate
Hemphill Moderate
Hockley Moderate 5
Hudspeth Moderate
Hutchinson Moderate
Jeff Davis Moderate
Lamb Moderate
Lipscomb Moderate
Llano Moderate 6
Lubbock Moderate 36 38.9%
Lynn Moderate
Mason Moderate
Moore Moderate
Ochiltree Moderate
Oldham Moderate
Parmer Moderate
Potter Moderate 18 27.8%
Presidio Moderate
Randall Moderate 21 28.6%
Reeves Moderate
Roberts Moderate
Sherman Moderate
Swisher Moderate
Terrell Moderate
Anderson Low 8 50%
Andrews Low
Angelina Low 16
Aransas Low 8
Archer Low
Atascosa Low 7
Austin Low 5
Bandera Low 6
Bastrop Low 15 46.7%
Baylor Low
Bee Low 5
Bell Low 39 28.2%
Bexar Low 267 28.1%
Blanco Low
Borden Low
Bosque Low 5
Bowie Low 18 33.3%
Brazoria Low 48 35.4%
Brazos Low 18 27.8%
Briscoe Low
Brooks Low
Brown Low 6
Burleson Low 5
Burnet Low 9 44.4%
Caldwell Low 7
Calhoun Low
Callahan Low
Cameron Low 44 29.5%
Camp Low
Cass Low 7
Chambers Low 5
Cherokee Low 13
Childress Low
Clay Low
Cochran Low
Coke Low
Coleman Low
Collin Low 108 27.8%
Collingsworth Low
Colorado Low 5
Comal Low 28 35.7%
Comanche Low
Concho Low
Cooke Low 7 57.1%
Coryell Low 9 44.4%
Cottle Low
Crane Low
Crockett Low
Dallas Low 315 26%
Dawson Low
DeWitt Low 4
Delta Low
Denton Low 88 35.2%
Dickens Low
Dimmit Low
Duval Low
Eastland Low
Ector Low 15 46.7%
Edwards Low
El Paso Low 101 25.7%
Ellis Low 23 43.5%
Erath Low 6
Falls Low
Fannin Low 6
Fayette Low 4
Fisher Low
Foard Low
Fort Bend Low 89 23.6%
Franklin Low
Freestone Low
Frio Low 4
Gaines Low
Galveston Low 48 33.3%
Gillespie Low 6
Glasscock Low
Goliad Low
Gonzales Low
Grayson Low 25 44%
Gregg Low 17 35.3%
Grimes Low 5
Guadalupe Low 27 37%
Hall Low
Hamilton Low
Hardeman Low
Hardin Low 12
Harris Low 517 28.6%
Harrison Low 10 40%
Haskell Low
Hays Low 22 40.9%
Henderson Low 17 41.2%
Hidalgo Low 71 29.6%
Hill Low 9
Hood Low 12 50%
Hopkins Low 6
Houston Low 4
Howard Low 6
Hunt Low 17 29.4%
Irion Low
Jack Low
Jackson Low
Jasper Low 7
Jefferson Low 37 35.1%
Jim Hogg Low
Jim Wells Low 6
Johnson Low 29 41.4%
Jones Low
Karnes Low
Kaufman Low 17 29.4%
Kendall Low 7 57.1%
Kenedy Low
Kent Low
Kerr Low 13 46.2%
Kimble Low
King Low
Kinney Low
Kleberg Low 5
Knox Low
La Salle Low
Lamar Low 8 50%
Lampasas Low 5
Lavaca Low 4
Lee Low
Leon Low 4
Liberty Low 10 50%
Limestone Low 6
Live Oak Low
Loving Low
Madison Low
Marion Low
Martin Low
Matagorda Low 8
Maverick Low 7
McCulloch Low
McLennan Low 39 20.5%
McMullen Low
Medina Low 8
Menard Low
Midland Low 17 41.2%
Milam Low 4
Mills Low
Mitchell Low
Montague Low
Montgomery Low 80 36.2%
Morris Low
Motley Low
Nacogdoches Low 10
Navarro Low 10
Newton Low
Nolan Low
Nueces Low 50 36%
Orange Low 15 33.3%
Palo Pinto Low 5
Panola Low 8
Parker Low 24 29.2%
Pecos Low
Polk Low 11 45.5%
Rains Low
Reagan Low
Real Low
Red River Low
Refugio Low
Robertson Low
Rockwall Low 12 50%
Runnels Low
Rusk Low 10 40%
Sabine Low 4
San Augustine Low
San Jacinto Low 4
San Patricio Low 10 40%
San Saba Low
Schleicher Low
Scurry Low
Shackelford Low
Shelby Low 4
Smith Low 40 27.5%
Somervell Low
Starr Low 6 66.7%
Stephens Low
Sterling Low
Stonewall Low
Sutton Low
Tarrant Low 260 30.4%
Taylor Low 18 44.4%
Terry Low
Throckmorton Low
Titus Low 6
Tom Green Low 15 40%
Travis Low 122 29.5%
Trinity Low 4
Tyler Low 4
Upshur Low 9
Upton Low
Uvalde Low 5
Val Verde Low 7
Van Zandt Low 10
Victoria Low 18 33.3%
Walker Low 12
Waller Low 7
Ward Low
Washington Low 6
Webb Low 22 27.3%
Wharton Low 7
Wheeler Low
Wichita Low 20 40%
Wilbarger Low
Willacy Low
Williamson Low 69 31.9%
Wilson Low 10
Winkler Low
Wise Low 11 54.5%
Wood Low 12 33.3%
Yoakum Low
Young Low 4
Zapata Low
Zavala Low

Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network

Frequently Asked Questions

How many counties in Texas have high radon risk?

Texas has 0 counties classified as EPA Zone 1 (high radon risk), 39 as Zone 2 (moderate), and 215 as Zone 3 (low risk).

Is radon a problem in Texas?

The EPA recommends all homes in Texas be tested for radon, regardless of which zone they're in.

How do I check radon levels for my Texas address?

Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.