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Radon Levels in Henderson County, Texas

EPA puts Henderson 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

  • Highest bordering

    9.1%

    Smith County

    Smith
    9.1%

    1 of 8 neighbours have 30+ tests, 2007 to 2016

  • Nearest county

    9.1%

    Smith County, 36 miles

    Smith
    9.1%
    Texas
    10.4%

    Share at 4+ pCi/L, 33 tests, 2007 to 2016

  • Ground above low

    None

    27.3 pts below Texas

    Henderson
    0.0%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Henderson
    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 Henderson 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

Henderson County, At a glance

Henderson County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Henderson 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 Henderson County, 2008 to 2017, laboratory

CDC holds 1 reported test for Henderson County over the 2008 to 2017 laboratory totals, a result of 0.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Henderson County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Henderson 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. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Henderson County, Compared

Henderson County radon figures, compared

Calculated by Radon411

CDC's largest figure for Henderson 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 0.8 pCi/L, with a middle value of 0.8 pCi/L.

Smith County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 9.1% of its tests at or above 4 pCi/L. Farther out, Dallas County (66 miles away) at 8.7%, Collin County (79 miles away) at 7.7% and McLennan County (91 miles away) at 17.1% have figures too. 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 Henderson 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 Henderson 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
Ellis County, TXborders it1457.1%11.0 pCi/L
Smith County, TXborders it339.1%0.8 pCi/L
Van Zandt County, TXborders it60.0%0.1 pCi/L
Kaufman County, TXborders it40.0%0.3 pCi/L
Navarro County, TXborders it60.0%0.8 pCi/L
Freestone County, TXborders it100.0%0.9 pCi/L
Cherokee County, TXborders it10.0%0.1 pCi/L
The nearest Texas counties to Henderson County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Smith County36 mi339.1%0.8 pCi/L
Dallas County66 mi6998.7%1.0 pCi/L
Collin County79 mi2847.7%1.0 pCi/L
McLennan County91 mi4117.1%1.0 pCi/L
Tarrant County92 mi31210.6%0.9 pCi/L
Denton County101 mi1817.2%0.9 pCi/L
Brazos County110 mi490.0%0.2 pCi/L
Bell County125 mi3514.3%1.1 pCi/L
Henderson County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 201710.0%0.8 pCi/L0.8 pCi/L10.2%Level
2007 to 201610.0%0.8 pCi/L0.8 pCi/L10.4%Level
2006 to 201510.0%0.8 pCi/L0.8 pCi/L11.0%Level
2005 to 201410.0%0.8 pCi/L0.8 pCi/L10.6%First on file

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

Henderson County, Geology

The ground under Henderson County

Predicted

USGS's geologic map puts all of Henderson 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 Henderson 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.

Henderson County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Henderson County's is. Of the 8 counties that border it, 1 has more moderate-potential ground, Ellis County the most at 41.3%.

Share of land by USGS radon potential: Henderson County, the 8 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Henderson CountyZone 3100%NoneNone
Van Zandt CountyZone 3100%NoneNone
Anderson CountyZone 3100%NoneNone
Smith CountyZone 3100%NoneNone
Freestone CountyZone 3100%NoneNone
Navarro CountyZone 3100%NoneNone
Kaufman CountyZone 3100%NoneNone
Cherokee CountyZone 3100%NoneNone
Ellis CountyZone 358.7%41.3%None
Texas254 counties, pooled by land areaVaries72.4%26.8%0.5%

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

Local help

Henderson County, Local resources

Radon testing and mitigation in Henderson 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

Henderson County, Questions

Questions about radon in Henderson County

Are radon levels high in Henderson County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Henderson County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Smith County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 9.1% of its tests at or above 4 pCi/L.

Which counties border Henderson County?

Henderson County borders 8 counties: Van Zandt County, Anderson County, Smith County, Freestone County, Navarro County, Kaufman County, Cherokee County and Ellis County.

Products

Henderson County, Products

Testing a home in Henderson County

No CDC figure names Henderson County; the nearest county with one, Smith County (36 miles away), reported 9.1% 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 Henderson County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Henderson County homes, compared

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Henderson County, Bordering counties

Counties bordering Henderson County

Calculated by Radon411

Henderson County, Cities and towns

Cities and towns in Henderson County

Henderson County is growing: the Census Bureau puts it at 88,595 residents on July 1, 2025, up 7.5% from 82,400 in 2020. That works out to 101 people per square mile of land. No town dominates: Athens, the largest, has 13,870 residents, 15.7% of the total. 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 Athens to Moore Station, CDC publishes no figure by town: each reads Henderson County's.

The 12 largest cities and towns in Henderson County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Athens13,870+7.7%15.7%
Mabankextends beyond Henderson County7,294+75.2%Counted whole
Gun Barrel City7,133+15.2%8.1%
Chandler4,081+24.5%4.6%
Tool2,427+11.4%2.7%
Malakoff2,253+2.9%2.5%
Seven Pointsextends beyond Henderson County1,530+13.1%Counted whole
Brownsboro1,322+8.5%1.5%
Eustace1,143+1.2%1.3%
Frankstonextends beyond Henderson County1,133+1.0%Counted whole
Berryville951+14.7%1.1%
Log Cabin885+30.1%1.0%
  • Trinidad
  • Payne Springs
  • Star Harbor
  • Murchison
  • Enchanted Oaks
  • Poynor
  • Coffee City
  • Caney City
  • Moore Station

21 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Henderson County is counted whole, so it has no share.

Henderson County, Homes

Homes in Henderson County

Of Henderson County's 41,352 homes, 64% are detached houses, against 65% across Texas; 26% are mobile homes. Half of its homes were built before 1987, close to Texas' 1990: 9% date from before 1960 and 30% from 2000 or later. Owners live in 77% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.

Homes in Henderson County, Texas, 2019 to 2023
HomesHenderson CountyTexas
Housing units41,35211,890,808
Detached houses64%65%
In buildings of 5 or more5%21%
Mobile homes26%7%
Built before 19609%13%
Built since 200030%37%
Middle year built19871990
Owner-occupied77%63%

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