Radon by ZIP

Radon zones in Texas

Last updated

EPA’s Map of Radon Zones places 254 Texas counties in its three radon potential zones: 0 in Zone 1 (highest), 39 in Zone 2 (moderate), and 215 in Zone 3 (low).

0Zone 1 · Highest potential
39Zone 2 · Moderate potential
215Zone 3 · Low potential

What this means for Texas homes

Most Texas counties fall in Zone 3. EPA predicts lower average indoor levels (below 2 pCi/L) across much of Texas. That does not mean your home is low: EPA notes that elevated levels are found in Zone 3 counties too.

EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.

Texas radon program

EPA lists the following state contact for Texas: TX Department of State Health Services, Radon Program, phone 806-834-6202. Website: www.depts.ttu.edu/ceweb/radon. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.

Texas counties and their EPA radon zones

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

County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.

Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.

Sources

  1. U.S. EPA, EPA Map of Radon Zones (text version)
  2. U.S. EPA, EPA Map of Radon Zones and Supplemental Information (state radon contacts)
  3. U.S. EPA, EPA Maps of Radon Zones and Supporting Documents by State