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.
Check Your Texas ZIP Code
All 254 Counties — By Radon Risk
| County | EPA Zone | Tests | % 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.