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Texas Radon Map and Levels by County

Texas's counties span EPA Zones 2 and 3. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    10.2%

    25.5 pts below U.S.

    Texas
    10.2%
    U.S.
    35.7%

    4,615 tests across 138 counties, 2008 to 2017

  • Rank among states

    45 of 47

    Ten lowest states

    Texas
    10.2%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    0 of 254

    None at highest potential

    Zone 1
    0
    Zone 2
    39

    Most counties sit in Zone 3; Zone 1 is the highest potential

  • Highest county

    69.0%

    Randall County

    Randall
    69.0%
    Nueces
    0.0%

    Counties with 30+ tests, 2008 to 2017

Read a result for Texas

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 10.2% of Texas's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Texas, At a glance

Texas at a glance

Predicted: EPA radon zone

254 of 254 counties classified

EPA classifies counties, not states. Of the 254 counties in Texas with a zone, 39 are in Zone 2 and 215 in Zone 3.

  • Zone 2: Moderate predicted potential2 to 4 pCi/L39 of 254 counties · 15.4%
  • Zone 3: Lower predicted potentialless than 2 pCi/L215 of 254 counties · 84.6%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Texas's radon test figures by county: 150 of its 254 counties have one. Each one's share is in the county list.

How to read these figures

Texas, Compared

Texas radon figures, compared

Calculated by Radon411
Texas, 2008 to 2017, laboratory
10.2%
of 4,615 tests at or above 4 pCi/L, pooled
Against the U.S.
−25.5points
35.7% pooled
Rank among the states
45 of 47
1 is the highest share
Counties with 30 or more tests
22
Highest
69.0%
Randall County
Lowest
0.0%
Nueces County

Fewer reported tests reach 4 pCi/L in Texas than in most states: 10.2% of 4,615 over the 2008 to 2017 laboratory totals, from 138 counties. Nationally the pooled share is 35.7%: 25.5 points higher than here. Among 47 states pooled the same way it ranks 45th, with California (10.3%) above it and District of Columbia (8.7%) below.

Randall County reports the highest share (69.0% of 87 tests) and Nueces County the lowest (0.0%); the most tests came from Harris County, 733 of them at 2.9%. EPA's 1993 map puts 0 of its 254 classified counties in Zone 1; the tests reported since bear that out at 10.2%.

By band, 2 counties at 50% or more, 3 counties at 15% to 30%, 8 counties at 5% to 15%, 9 counties at under 5%. Across its 4 overlapping ten-year totals, the share went from 10.6% (2005 to 2014) to 10.2% (2008 to 2017), within 2 points, with 2006 to 2015 the highest at 11.0%.

Texas ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Alabama37 of 476512,56921.9%
Vermont38 of 471410,60021.7%
South Carolina39 of 474626,48119.4%
Alaska40 of 47983018.2%
Arizona41 of 47133,58916.8%
Delaware42 of 47312,21416.7%
Oklahoma43 of 475281412.7%
California44 of 47569,41510.3%
Texas45 of 471384,61510.2%
District of Columbia46 of 4712,1268.7%
Louisiana47 of 47364992.2%
Texas' highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Randall County1 of 228769.0%
Lubbock County2 of 2212255.7%
McLennan County3 of 223023.3%
Potter County4 of 227423.0%
Bell County5 of 223016.7%
Tarrant County6 of 2228413.0%
Travis County7 of 224269.2%
Dallas County8 of 227288.4%
Collin County9 of 222897.6%
Denton County10 of 221926.8%
Nueces County22 of 22430.0%
Brazos County21 of 22470.0%
El Paso County20 of 22570.0%
Galveston County19 of 22730.0%
Midland County18 of 221001.0%
Texas' counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more2209Randall County, Lubbock County
30% to 50%00None
15% to 30%3134McLennan County, Potter County, Bell County
5% to 15%82,204Tarrant County, Travis County, Dallas County
Under 5%91,449Montgomery County, Harris County, Fort Bend County
Texas ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 20171384,61510.2%35.7%−0.3 points
2007 to 20161404,54810.4%35.8%−0.6 points
2006 to 20151404,07311.0%36.3%+0.4 points
2005 to 20141403,72110.6%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Texas, Counties

Texas counties by EPA zone

Predicted

The map of Texas, then its 254 counties zone by zone, each with its reported share at or above 4 pCi/L and a report of its own.

Texas radon map by county: EPA radon zones. Map of Texas's 254 counties shaded by EPA radon zone: Zone 2 in amber, Zone 3 in pale sand. 0 in Zone 1, 39 in Zone 2, 215 in Zone 3.
Texas radon map by countyEPA radon zones for Texas's counties: 0 counties in Zone 1, 39 counties in Zone 2, 215 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Texas, 2008 to 2017

Zone 2: moderate predicted potential39

Local help

Texas, Local resources

Local resources in Texas

Who to ask in Texas: its radon program, test kits and professionals.

What Texas's program says
Licensing of radon professionals
There are no radon certification requirements for the State of Texas at this time, but the National Radon Proficiency Program lists radon testers and mitigators within Texas that have passed a rigorous national certification program.

What it means

Texas, Questions

Questions about radon in Texas

Is radon a problem in Texas?

Texas has 254 counties on EPA's Map of Radon Zones: Zone 1, the highest predicted potential, for 0; Zone 2 for 39; Zone 3 for 215. Pooled from 138 counties, 10.2% of the 4,615 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 45th of 47 states.

Who does radon mitigation in Texas?

7 radon businesses are listed for Texas, for testing, mitigation or both; each listing names the licensing list it was read from.

Which Texas counties have the highest radon?

Randall County 69.0% (87 tests) leads Texas by the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory, then Lubbock County 55.7% (122 tests), McLennan County 23.3% (30 tests), Potter County 23.0% (74 tests), Bell County 16.7% (30 tests).

Which EPA region is Texas in?

Texas is in EPA Region 6: South Central.

Products

Texas, Products

Testing a home in Texas

10.2% of the 4,615 tests reported to CDC for Texas over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Texas; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Texas homes, compared

Explore

Cities in Texas with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.