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Radon Levels in Houston County, Texas

EPA puts Houston County in Zone 3, its lowest radon zone, and only 1 radon test from it is on file with CDC (2008 to 2017, laboratory totals). 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

  • Nearest county

    0.0%

    Brazos County, 69 miles

    Brazos
    0.0%
    Texas
    10.4%

    Share at 4+ pCi/L, 49 tests, 2007 to 2016

  • Ground above low

    None

    27.3 pts below Texas

    Houston
    0.0%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Houston
    1
    Needed
    30

    2008 to 2017, laboratory

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

Read a result for Houston County

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.

Interpret this readingWhat a fix costs

The data

Houston County, At a glance

Houston County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Houston County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Houston County, 2008 to 2017, laboratory

CDC holds 1 reported test for Houston County over the 2008 to 2017 laboratory totals, a result of 2.2 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Houston County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Houston County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Measured data period: 2008 to 2017.

How to read these figures

Houston County, Compared

Houston County radon figures, compared

Calculated by Radon411

CDC's largest figure for Houston County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 2.2 pCi/L, with a middle value of 2.2 pCi/L.

The nearest counties with a figure are Brazos County (69 miles away) at 0.0%, Montgomery County (70 miles away) at 7.1% and Smith County (73 miles away) at 9.1%. Pooled across 140 Texas counties, 10.4% of reported tests reached that level; across every county in the country with a figure, 35.8%.

Statewide for the same period, Randall County reported the highest share (71.4%) and Nueces County the lowest (0.0%). EPA's 1993 map puts Houston County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.

Texas, the United States and the counties around Houston County, 2007 to 2016, laboratory
AreaTestsAt or above 4 pCi/LMedian
Texas, pooled140 counties, pooled4,54810.4%Not pooled
United States, pooled2,666 counties, pooled1,939,02535.8%Not pooled
Randall Countyhighest in the state8471.4%6.2 pCi/L
Nueces Countylowest in the state450.0%0.6 pCi/L
Walker County, TXborders it70.0%0.5 pCi/L
Madison County, TXborders it10.0%1.5 pCi/L
Angelina County, TXborders it30.0%0.1 pCi/L
Cherokee County, TXborders it10.0%0.1 pCi/L
The nearest Texas counties to Houston County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Brazos County69 mi490.0%0.2 pCi/L
Montgomery County70 mi857.1%0.6 pCi/L
Smith County73 mi339.1%0.8 pCi/L
Harris County101 mi7753.1%0.2 pCi/L
McLennan County106 mi4117.1%1.0 pCi/L
Bell County123 mi3514.3%1.1 pCi/L
Fort Bend County125 mi1173.4%0.2 pCi/L
Dallas County128 mi6998.7%1.0 pCi/L

Pooled shares: Radon411's sum of CDC's county counts for one period.

Houston County, Geology

The ground under Houston County

Predicted

USGS's geologic map puts all of Houston County's mapped land in one class: low radon potential. All of it lies in the area the map calls East Texas Province, to which USGS gives a radon index of 6, in the low band (5 to 8).

USGS's geologic areas under Houston County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
East Texas ProvinceCretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite.Low6100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Houston County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Houston County's is. None of the 7 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Houston County, the 7 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Houston CountyZone 3100%NoneNone
Trinity CountyZone 3100%NoneNone
Leon CountyZone 3100%NoneNone
Madison CountyZone 3100%NoneNone
Walker CountyZone 3100%NoneNone
Cherokee CountyZone 3100%NoneNone
Anderson CountyZone 3100%NoneNone
Angelina CountyZone 3100%NoneNone
Texas254 counties, pooled by land areaVaries72.4%26.8%0.5%

The map rates the ground, not the air in any home.

Local help

Houston County, Local resources

Radon testing and mitigation in Houston County

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

Houston County, Questions

Questions about radon in Houston County

Are radon levels high in Houston County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Houston County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of the 8 nearest counties with a figure, within 128 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 17.1%.

Which counties border Houston County?

Houston County borders 7 counties: Trinity County, Leon County, Madison County, Walker County, Cherokee County, Anderson County and Angelina County.

Products

Houston County, Products

Testing a home in Houston County

No CDC figure names Houston County; the nearest county with one, Brazos County (69 miles away), reported 0.0% of its tests at or above 4 pCi/L over the 2007 to 2016 laboratory totals, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Houston County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Houston County homes, compared

Explore

Houston County, Bordering counties

Counties bordering Houston County

Calculated by Radon411

Houston County, Cities and towns

Cities and towns in Houston County

The Census Bureau estimates 22,316 residents in Houston County for July 1, 2025, 243 more than in 2020 (+1.1%). That works out to 18 people per square mile of land. Its largest town, Crockett, has 6,346 residents, 28.4% of the total. Together its 5 incorporated places hold 40.0% of those residents; the other 60.0% live outside any of them. Reported testing is thin here: 1 test over 2008 to 2017, or under 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.

From Crockett to Latexo, CDC publishes no figure by town: each reads Houston County's.

The cities and towns in Houston County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Crockett6,346−0.3%28.4%
Grapeland1,475+1.3%6.6%
Lovelady590+3.1%2.6%
Kennard285+4.8%1.3%
Latexo238+1.7%1.1%

5 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Houston County, Homes

Homes in Houston County

Of Houston County's 10,833 homes, 70% are detached houses, against 65% across Texas; 19% are mobile homes. The homes are older than Texas' as a whole: half were built before 1980 (1990 for Texas), and 19% date from before 1960. 69% of occupied homes are lived in by their owner (Texas: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Houston County, Texas, 2019 to 2023
HomesHouston CountyTexas
Housing units10,83311,890,808
Detached houses70%65%
In buildings of 5 or more4%21%
Mobile homes19%7%
Built before 196019%13%
Built since 200018%37%
Middle year built19801990
Owner-occupied69%63%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.