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Radon zones in Texas

The EPA assigns every county in Texas to one of three radon potential zones. No county in Texas is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

254
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
39
Zone 2 counties
Predicted average 2-4 pCi/L
215
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Texas

Every county in Texas, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 39Zone 3 · 215

Hover a county · click to open it

County by county

All 254 Texas counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Armstrong County21,8327.4%12.8% -
Bailey County26,6727.1%14.4% -
Brewster County29,5135.5%9.7% -
Carson County25,8786.9%13.1% -
Castro County27,2276.7%13.3% -
Crosby County24,9178.6%15.9% -
Culberson County22,1968.0%16.1% -
Dallam County27,2377.4%16.9% -
Deaf Smith County218k7.2%15.7%30.1
Donley County23,2148.9%14.3% -
Floyd County25,0908.3%15.2% -
Garza County24,5177.5%16.9% -
Gray County221k8.2%16.4%44.5
Hale County232k7.4%15.7%25.0
Hansford County25,0717.0%13.6% -
Hartley County25,1456.3%13.4% -
Hemphill County23,1896.2%11.7% -
Hockley County221k7.0%14.5%34.1
Hudspeth County23,4516.6%18.7% -
Hutchinson County220k7.5%14.8%25.3
Jeff Davis County21,85611.6%14.4% -
Lamb County213k7.9%15.2%33.9
Lipscomb County22,9068.3%14.5% -
Llano County223k9.5%12.5%34.3
Lubbock County2321k5.8%12.6%31.1
Lynn County25,7618.0%15.9% -
Mason County23,9318.1%11.5% -
Moore County221k6.8%15.7%29.0
Ochiltree County29,7047.1%14.9% -
Oldham County21,7837.6%15.3% -
Parmer County29,6176.4%13.4%29.2
Potter County2115k8.2%17.3%38.4
Presidio County25,7958.4%14.6% -
Randall County2148k5.8%12.0%30.3
Reeves County212k6.2%15.6%33.4
Roberts County28406.7%12.4% -
Sherman County22,6786.2%12.3% -
Swisher County26,9558.9%17.6%35.9
Terrell County26875.6%9.2% -
Anderson County358k7.8%17.4%47.4
Andrews County319k6.1%14.5%34.1
Angelina County387k8.8%17.1%39.8
Aransas County325k9.1%14.1%45.3
Archer County39,0298.1%14.6%31.5
Atascosa County352k6.3%13.7%25.1
Austin County332k8.2%14.6%31.1
Bandera County323k9.0%13.9%31.6
Bastrop County3111k6.8%14.0%31.3
Baylor County33,4639.7%16.2%53.0
Bee County331k5.7%14.8%30.8
Bell County3393k5.9%13.3%35.7
Bexar County32.1M5.1%12.2%23.1
Blanco County313k7.2%11.5%38.1
Borden County35727.4%12.4% -
Bosque County319k8.7%14.2%50.4
Bowie County392k8.1%16.0%46.4
Brazoria County3399k5.1%11.6%33.2
Brazos County3245k5.2%11.7%26.0
Briscoe County31,44510.4%16.8% -
Brooks County36,8487.1%15.4% -
Brown County339k8.5%15.3%33.3
Burleson County319k7.8%14.1%47.9
Burnet County354k7.8%13.1%31.7
Caldwell County350k6.8%14.4%34.0
Calhoun County320k6.9%13.0%41.7
Callahan County314k8.2%14.7%36.7
Cameron County3427k6.2%13.0%17.8
Camp County313k9.5%17.2%52.4
Cass County329k9.9%17.2%51.3
Chambers County354k5.7%13.4%31.9
Cherokee County352k8.9%16.9%39.0
Childress County36,7886.9%14.7%44.2
Clay County311k8.3%14.2%35.0
Cochran County32,5099.7%19.3% -
Coke County33,3529.9%15.3% -
Coleman County37,8429.4%15.5%66.4
Collin County31.2M4.1%9.3%22.0
Collingsworth County32,5639.3%16.5% -
Colorado County321k7.9%13.6%29.3
Comal County3194k5.6%10.5%28.7
Comanche County314k8.7%14.5%29.4
Concho County33,2977.8%15.8% -
Cooke County344k7.9%14.5%46.5
Coryell County385k5.7%14.1%45.6
Cottle County31,29411.0%17.6% -
Crane County34,5746.3%14.3% -
Crockett County32,8587.4%14.3% -
Dallas County32.6M5.6%12.5%27.7
Dawson County312k7.6%17.1%26.1
Delta County35,5208.7%15.9%55.1
Denton County31.0M4.3%9.8%23.8
DeWitt County320k8.6%16.0%29.1
Dickens County31,7119.8%15.1% -
Dimmit County38,2579.4%18.9%33.3
Duval County39,6047.0%14.8% -
Eastland County318k9.1%15.6%46.8
Ector County3164k5.5%14.2%39.7
Edwards County31,3939.9%15.0% -
El Paso County3870k4.9%12.1%16.5
Ellis County3223k5.6%12.6%33.6
Erath County344k6.6%12.9%35.3
Falls County317k9.1%17.1%33.5
Fannin County338k8.5%16.6%48.4
Fayette County325k7.7%12.3%26.1
Fisher County33,6127.6%13.4% -
Foard County31,07911.8%18.0% -
Fort Bend County3917k4.2%9.8%20.0
Franklin County311k7.6%13.1%43.0
Freestone County320k8.6%16.0%50.8
Frio County318k5.9%15.0%24.4
Gaines County323k6.6%16.4%29.5
Galveston County3362k6.0%12.3%34.6
Gillespie County328k7.7%11.1%18.1
Glasscock County31,1415.2%10.8% -
Goliad County37,1448.4%14.2%32.0
Gonzales County320k8.3%15.8%37.4
Grayson County3147k7.4%14.4%42.2
Gregg County3126k7.7%15.3%36.3
Grimes County332k8.1%15.7%26.0
Guadalupe County3188k5.5%12.5%28.1
Hall County32,8189.6%15.6% -
Hamilton County38,6199.4%15.3%42.1
Hardeman County33,4909.1%15.8% -
Hardin County358k7.9%15.6%40.0
Harris County34.8M5.5%12.7%24.8
Harrison County371k7.9%15.2%38.3
Haskell County35,3859.0%16.3% -
Hays County3280k4.8%10.8%22.5
Henderson County386k9.2%16.1%52.6
Hidalgo County3898k5.9%13.3%15.1
Hill County338k8.4%15.3%40.7
Hood County368k7.4%12.0%35.6
Hopkins County338k8.3%15.5%42.3
Houston County322k9.9%17.9%33.0
Howard County331k6.6%15.1%40.8
Hunt County3113k7.4%15.2%50.8
Irion County31,5497.2%12.8% -
Jack County38,8758.8%17.5%50.1
Jackson County315k8.2%15.0%34.3
Jasper County333k10.7%18.9%43.5
Jefferson County3251k7.8%16.1%33.5
Jim Hogg County34,7208.9%17.2% -
Jim Wells County339k6.9%14.6%25.8
Johnson County3203k6.6%14.4%38.0
Jones County320k7.5%17.1%39.7
Karnes County315k6.8%16.0%30.7
Kaufman County3186k5.8%14.0%43.8
Kendall County351k5.5%10.0%22.5
Kenedy County33437.2%15.1% -
Kent County37347.2%11.5% -
Kerr County354k8.4%12.4%33.0
Kimble County34,44210.1%14.8% -
King County321710.8%17.5% -
Kinney County33,1487.5%12.2% -
Kleberg County330k5.5%12.1%23.8
Knox County33,3028.7%15.6% -
La Salle County36,5376.8%15.3% -
Lamar County351k9.1%16.7%48.9
Lampasas County323k7.9%14.2%35.3
Lavaca County321k8.7%14.4%36.3
Lee County318k9.0%16.4%26.5
Leon County317k9.5%15.9%38.5
Liberty County3108k8.0%17.8%47.7
Limestone County322k9.3%16.6%36.9
Live Oak County312k8.7%16.8%35.8
Loving County3515.7%15.3% -
Madison County314k7.6%16.2%43.4
Marion County39,57111.2%17.7%48.5
Martin County35,2166.0%14.0% -
Matagorda County336k8.3%15.3%36.4
Maverick County358k5.7%14.2%19.8
McCulloch County37,4528.9%15.1%38.3
McLennan County3269k6.8%13.5%31.7
McMullen County35689.1%15.9% -
Medina County355k6.1%12.6%24.5
Menard County31,9589.8%14.0% -
Midland County3177k4.9%12.0%28.8
Milam County326k8.5%15.3%38.0
Mills County34,5488.3%12.7% -
Mitchell County39,0757.0%16.0%42.9
Montague County322k8.8%15.7%42.2
Montgomery County3711k5.6%11.8%30.3
Morris County312k9.4%16.7%49.2
Motley County31,0209.2%14.4% -
Nacogdoches County365k7.9%14.9%38.2
Navarro County356k8.6%16.6%39.1
Newton County312k13.0%22.2%42.6
Nolan County314k9.4%17.3%38.8
Nueces County3352k6.0%13.1%24.7
Orange County386k7.7%15.7%45.8
Palo Pinto County330k9.1%16.3%50.2
Panola County323k8.4%15.6%49.9
Parker County3173k6.4%12.9%37.6
Pecos County315k6.5%15.8%31.6
Polk County354k9.8%18.9%63.0
Rains County313k8.8%14.6%44.3
Reagan County33,1415.5%13.1% -
Real County32,85411.0%16.4%56.0
Red River County312k10.7%17.5%47.2
Refugio County36,6668.4%15.0%27.5
Robertson County317k8.7%15.7%38.2
Rockwall County3131k4.5%10.0%30.2
Runnels County39,8687.8%14.3%51.8
Rusk County353k8.0%16.1%45.3
Sabine County310k11.1%16.2%41.4
San Augustine County37,83314.1%21.8%54.3
San Jacinto County329k10.1%17.5%47.8
San Patricio County371k6.9%14.4%27.6
San Saba County35,8458.6%14.9%48.5
Schleicher County32,3916.7%12.3% -
Scurry County316k7.0%14.2%29.1
Shackelford County33,2297.1%12.5% -
Shelby County324k10.1%18.5%50.0
Smith County3245k7.0%13.6%32.7
Somervell County39,8887.1%13.4%29.1
Starr County366k7.2%16.9%20.4
Stephens County39,3438.4%15.6%38.3
Sterling County31,3974.9%11.2% -
Stonewall County31,2189.6%15.0% -
Sutton County33,2217.6%14.0% -
Tarrant County32.2M5.4%12.7%29.6
Taylor County3147k6.3%12.9%31.0
Terry County312k8.2%16.7%33.0
Throckmorton County31,5269.7%14.9% -
Titus County331k8.5%16.5%37.8
Tom Green County3119k6.5%12.8%32.0
Travis County31.3M4.0%9.5%19.9
Trinity County314k10.5%16.8%61.8
Tyler County320k10.7%19.3%47.6
Upshur County343k9.0%16.6%47.9
Upton County33,1098.0%16.6% -
Uvalde County325k6.6%13.1%31.0
Val Verde County348k5.6%13.0%19.7
Van Zandt County364k8.5%15.6%41.1
Victoria County392k6.9%13.9%29.0
Walker County381k7.3%16.2%28.3
Waller County364k5.4%12.2%37.0
Ward County311k6.4%14.5%42.2
Washington County337k7.1%12.1%23.3
Webb County3269k5.0%12.7%16.2
Wharton County342k7.4%14.2%27.4
Wheeler County34,8049.1%16.0%46.9
Wichita County3130k7.1%14.6%43.6
Wilbarger County313k9.9%18.2%26.6
Willacy County320k7.2%16.4%17.2
Williamson County3697k4.3%9.9%22.4
Wilson County354k6.1%12.4%26.1
Winkler County37,4146.0%14.1% -
Wise County378k7.2%14.8%45.4
Wood County348k9.3%14.8%44.8
Yoakum County37,4685.8%12.9% -
Young County318k8.1%14.5%46.6
Zapata County314k7.8%17.1%27.2
Zavala County39,3128.4%18.0%29.2

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere