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Radon Levels in Kimble County, Texas

EPA puts Kimble 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

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  • Nearest county

    6.6%

    Bexar County, 103 miles

    Bexar
    6.6%
    Texas
    10.4%

    Share at 4+ pCi/L, 197 tests, 2007 to 2016

  • Ground above low

    1.7%

    25.6 pts below Texas

    Kimble
    1.7%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    2

    Too few for a share

    Kimble
    2
    Needed
    30

    2006 to 2015, 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 Kimble 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

Kimble County, At a glance

Kimble County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Kimble 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 98% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

CDC holds 1 reported test for Kimble County over the 2008 to 2017 laboratory totals, a result of 2.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Kimble County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Kimble 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

Kimble County, Compared

Kimble County radon figures, compared

Calculated by Radon411

CDC's largest figure for Kimble County rests on 2 tests over the 2006 to 2015 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 2.1 pCi/L, with a middle value of 1.4 pCi/L.

The nearest counties with a figure are Bexar County (103 miles away) at 6.6%, Travis County (118 miles away) at 9.3% and Williamson County (129 miles away) at 2.0%. 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 Kimble County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 98% of the county's land low radon potential.

Texas, the United States and the counties around Kimble 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
Gillespie County, TXborders it1020.0%0.8 pCi/L
Kerr County, TXborders it1612.5%1.1 pCi/L
The nearest Texas counties to Kimble County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Bexar County103 mi1976.6%0.6 pCi/L
Travis County118 mi4089.3%0.8 pCi/L
Williamson County129 mi982.0%0.7 pCi/L
Bell County140 mi3514.3%1.1 pCi/L
Midland County165 mi1001.0%0.7 pCi/L
McLennan County168 mi4117.1%1.0 pCi/L
Brazos County206 mi490.0%0.2 pCi/L
Tarrant County214 mi31210.6%0.9 pCi/L
Kimble County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 201710.0%2.1 pCi/L2.1 pCi/L10.2%Level
2007 to 201610.0%2.1 pCi/L2.1 pCi/L10.4%Level
2006 to 201520.0%1.4 pCi/L2.1 pCi/L11.0%Level
2005 to 201420.0%1.4 pCi/L2.1 pCi/L10.6%First on file

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

Kimble County, Geology

The ground under Kimble County

Predicted

Most of the ground under Kimble County is one class on USGS's geologic map: 98.3% of its land is low radon potential, with 1.7% moderate. 98.3% of it lies in the area the map calls Southern High Plains and Plateaus, to which USGS gives a radon index of 7, in the low band (5 to 8).

USGS's geologic areas under Kimble County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Southern High Plains and PlateausPaleozoic and Mesozoic sandstone, limestone, shale.Low798.3%
Llano UpliftPrecambrian metamorphic and undifferentiated igneous rocks.Moderate101.7%

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

Kimble County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Kimble County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Mason County the most at 85.7%.

Share of land by USGS radon potential: Kimble County, the 7 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Kimble CountyZone 398.3%1.7%None
Menard CountyZone 3100%NoneNone
Kerr CountyZone 3100%NoneNone
Mason CountyZone 214.3%85.7%None
Gillespie CountyZone 386.8%13.2%None
Edwards CountyZone 3100%NoneNone
Sutton CountyZone 3100%NoneNone
Schleicher 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

Kimble County, Local resources

Radon testing and mitigation in Kimble 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

Kimble County, Questions

Questions about radon in Kimble County

Are radon levels high in Kimble County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Kimble County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of the 8 nearest counties with a figure, within 214 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 17.1%.

Which counties border Kimble County?

Kimble County borders 7 counties: Menard County, Kerr County, Mason County, Gillespie County, Edwards County, Sutton County and Schleicher County.

Products

Kimble County, Products

Testing a home in Kimble County

No CDC figure names Kimble County; the nearest county with one, Bexar County (103 miles away), reported 6.6% 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 Kimble County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Kimble County homes, compared

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Kimble County, Bordering counties

Counties bordering Kimble County

Calculated by Radon411

Kimble County, Cities and towns

Cities and towns in Kimble County

The Census Bureau estimates 4,438 residents in Kimble County for July 1, 2025, 145 more than in 2020 (+3.4%). Spread over its land, that is 3.5 people to the square mile. Junction, its one incorporated place, has 2,513 residents, 56.6% of the total. Testing is reported here more often than across the state: CDC's 2 reported tests for 2006 to 2015 come to 0.5 for every 1,000 residents (2025 estimate), against 0.1 for Texas.

Junction is the one incorporated place here; CDC publishes no figure by town, so it reads Kimble County's.

Junction, Kimble County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Junction2,513+2.8%56.6%

One incorporated place, 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).

Kimble County, Homes

Homes in Kimble County

Kimble County is a place of houses on their own lots: 79% of its 2,825 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1980 (1990 for Texas), and 27% date from before 1960. Owners live in 79% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.

Homes in Kimble County, Texas, 2019 to 2023
HomesKimble CountyTexas
Housing units2,82511,890,808
Detached houses79%65%
In buildings of 5 or more2%21%
Mobile homes16%7%
Built before 196027%13%
Built since 200024%37%
Middle year built19801990
Owner-occupied79%63%

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