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Radon Levels in Jasper County, Texas

EPA puts Jasper County in Zone 3, its lowest radon zone, and only 2 radon tests from it are 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

    7.1%

    Montgomery County, 93 miles

    Montgomery
    7.1%
    Texas
    10.4%

    Share at 4+ pCi/L, 85 tests, 2007 to 2016

  • Ground above low

    None

    27.3 pts below Texas

    Jasper
    0.0%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    2

    Too few for a share

    Jasper
    2
    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 Jasper 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

Jasper County, At a glance

Jasper County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

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

CDC holds 2 reported tests for Jasper County over the 2008 to 2017 laboratory totals, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Jasper County beside the counties around it is how this page reads it.

What these figures count

Only 2 tests were reported to CDC for Jasper 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

Jasper County, Compared

Jasper County radon figures, compared

Calculated by Radon411

CDC's largest figure for Jasper County rests on 2 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 0.1 pCi/L, with a middle value of 0.1 pCi/L.

The nearest counties with a figure are Montgomery County (93 miles away) at 7.1%, Harris County (102 miles away) at 3.1% and Galveston County (109 miles away) at 0.0%. 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 Jasper 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 Jasper 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
Orange County, TXborders it110.0%0.8 pCi/L
Hardin County, TXborders it70.0%0.7 pCi/L
Angelina County, TXborders it30.0%0.1 pCi/L
The nearest Texas counties to Jasper County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Montgomery County93 mi857.1%0.6 pCi/L
Harris County102 mi7753.1%0.2 pCi/L
Galveston County109 mi830.0%0.2 pCi/L
Fort Bend County134 mi1173.4%0.2 pCi/L
Smith County134 mi339.1%0.8 pCi/L
Brazos County136 mi490.0%0.2 pCi/L
Brazoria County137 mi326.3%0.3 pCi/L
McLennan County196 mi4117.1%1.0 pCi/L
Jasper County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 201720.0%0.1 pCi/L0.1 pCi/L10.2%Level
2007 to 201620.0%0.1 pCi/L0.1 pCi/L10.4%Level
2006 to 201520.0%0.1 pCi/L0.1 pCi/L11.0%Level
2005 to 201420.0%0.1 pCi/L0.1 pCi/L10.6%First on file

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

Jasper County, Geology

The ground under Jasper County

Predicted

USGS's geologic map puts all of Jasper County's mapped land in one class: low radon potential. The map puts 85.7% of Jasper County in the area it calls Coastal Plain and 14.3% in East Texas Province. USGS gives the first a radon index of 7 and the second 6, both in the low band (5 to 8).

USGS's geologic areas under Jasper County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Coastal PlainCretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite.Low785.7%
East Texas ProvinceCretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite.Low614.3%

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

Jasper County beside the ground around it

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

Share of land by USGS radon potential: Jasper County, the 7 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Jasper CountyZone 3100%NoneNone
Newton CountyZone 3100%NoneNone
Tyler CountyZone 3100%NoneNone
Hardin CountyZone 3100%NoneNone
Sabine CountyZone 3100%NoneNone
San Augustine CountyZone 3100%NoneNone
Orange 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

Jasper County, Local resources

Radon testing and mitigation in Jasper 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

Jasper County, Questions

Questions about radon in Jasper County

Are radon levels high in Jasper County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Jasper County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the 8 nearest counties with a figure, within 196 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 17.1%.

Which counties border Jasper County?

Jasper County borders 7 counties: Newton County, Tyler County, Hardin County, Sabine County, San Augustine County, Orange County and Angelina County.

Products

Jasper County, Products

Testing a home in Jasper County

No CDC figure names Jasper County; the nearest county with one, Montgomery County (93 miles away), reported 7.1% 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 Jasper County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Jasper County homes, compared

Explore

Jasper County, Bordering counties

Counties bordering Jasper County

Calculated by Radon411

Jasper County, Cities and towns

Cities and towns in Jasper County

Jasper County's population has barely moved since 2020: 33,075 residents on July 1, 2025 against 32,921 then, by the Census Bureau's estimates. That works out to 35 people per square mile of land. Its largest town, Jasper, has 7,511 residents, 22.7% of the total. Together its 3 incorporated places hold 29.3% of those residents; the other 70.7% live outside any of them. Reported testing is thin here: 2 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.

From Jasper to Browndell, CDC publishes no figure by town: each reads Jasper County's.

The cities and towns in Jasper County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Jasper7,511+9.0%22.7%
Kirbyville2,031+0.4%6.1%
Browndell154−1.9%0.5%

3 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).

Jasper County, Homes

Homes in Jasper County

Mobile homes are 31% of Jasper County's 16,558 homes and detached houses 47%, against 65% across Texas. Half of its homes were built before 1987, close to Texas' 1990: 11% date from before 1960 and 25% from 2000 or later. Owners live in 78% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.

Homes in Jasper County, Texas, 2019 to 2023
HomesJasper CountyTexas
Housing units16,55811,890,808
Detached houses47%65%
In buildings of 5 or more3%21%
Mobile homes31%7%
Built before 196011%13%
Built since 200025%37%
Middle year built19871990
Owner-occupied78%63%

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