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Radon Levels in Donley County, Texas

EPA puts Donley County in Zone 2, its middle 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

    71.4%

    Randall County, 61 miles

    Randall
    71.4%
    Texas
    10.4%

    Share at 4+ pCi/L, 84 tests, 2007 to 2016

  • Ground above low

    58.7%

    31.4 pts above Texas

    Donley
    58.7%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Donley
    1
    Needed
    30

    2008 to 2017, laboratory

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

Read a result for Donley 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

Donley County, At a glance

Donley County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Donley County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 59% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

CDC holds 1 reported test for Donley County over the 2008 to 2017 laboratory totals, a result of 4.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Donley County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Donley 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

Donley County, Compared

Donley County radon figures, compared

Calculated by Radon411

CDC's largest figure for Donley County rests on 1 test over the 2008 to 2017 laboratory totals, 1 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 4.0 pCi/L, with a middle value of 4.0 pCi/L.

The nearest counties with a figure are Randall County (61 miles away) at 71.4%, Potter County (68 miles away) at 20.0% and Lubbock County (110 miles away) at 57.8%. 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 Donley County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 59% of the county's land moderate radon potential.

Texas, the United States and the counties around Donley 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
Carson County, TXborders it2100.0%36.2 pCi/L
Collingsworth County, TXborders it1100.0%12.6 pCi/L
Gray County, TXborders it30.0%1.9 pCi/L
Wheeler County, TXborders it30.0%2.7 pCi/L
The nearest Texas counties to Donley County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Randall County61 mi8471.4%6.2 pCi/L
Potter County68 mi7020.0%1.1 pCi/L
Lubbock County110 mi12857.8%4.8 pCi/L
Midland County225 mi1001.0%0.7 pCi/L
Denton County244 mi1817.2%0.9 pCi/L
Tarrant County253 mi31210.6%0.9 pCi/L
Collin County272 mi2847.7%1.0 pCi/L
Dallas County277 mi6998.7%1.0 pCi/L
Donley County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 20171100.0%4.0 pCi/L4.0 pCi/L10.2%Level
2007 to 20161100.0%4.0 pCi/L4.0 pCi/L10.4%Level
2006 to 20151100.0%4.0 pCi/L4.0 pCi/L11.0%Level
2005 to 20141100.0%4.0 pCi/L4.0 pCi/L10.6%First on file

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

Donley County, Geology

The ground under Donley County

Predicted

USGS's geologic map splits Donley County: 58.7% of its land is moderate radon potential and 41.3% low. The map puts 58.7% of Donley County in the area it calls Northern High Plains and Plateaus and 41.3% in Central Texas. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 7, in the low band (5 to 8).

USGS's geologic areas under Donley County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern High Plains and PlateausTertiary sandstone, siltstone, shale.Moderate1058.7%
Central TexasCretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite.Low741.3%

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

Donley County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Donley County's is. Of the 7 counties that border it, 3 have more moderate-potential ground, Carson County the most at 100%.

Share of land by USGS radon potential: Donley County, the 7 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Donley CountyZone 241.3%58.7%None
Gray CountyZone 27.0%93.0%None
Armstrong CountyZone 240.6%59.4%None
Hall CountyZone 3100%NoneNone
Collingsworth CountyZone 398.7%1.3%None
Briscoe CountyZone 359.1%40.9%None
Wheeler CountyZone 352.6%47.4%None
Carson CountyZone 2None100%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

Donley County, Local resources

Radon testing and mitigation in Donley 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

Donley County, Questions

Questions about radon in Donley County

Are radon levels high in Donley County?

Over the 2008 to 2017 laboratory totals, 100.0% of the radon tests reported to CDC for Donley County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of the 8 nearest counties with a figure, within 277 miles, the share of tests at or above 4 pCi/L runs from 1.0% to 71.4%.

Which counties border Donley County?

Donley County borders 7 counties: Gray County, Armstrong County, Hall County, Collingsworth County, Briscoe County, Wheeler County and Carson County.

Products

Donley County, Products

Testing a home in Donley County

No CDC figure names Donley County; the nearest county with one, Randall County (61 miles away), reported 71.4% 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. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Donley County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Donley County homes, compared

Explore

Donley County, Bordering counties

Counties bordering Donley County

Calculated by Radon411

Donley County, Cities and towns

Cities and towns in Donley County

About 3,213 people live in Donley County by the Census Bureau's estimate for July 1, 2025, 63 fewer than in 2020 (−1.9%). Spread over its land, that is 3.5 people to the square mile. Clarendon alone is home to 1,860 of them, 57.9% of the total. Together its 3 incorporated places hold 77.6% of those residents; the other 22.4% live outside any of them. Testing is reported here more often than across the state: CDC's 1 reported test for 2008 to 2017 come to 0.3 for every 1,000 residents (2025 estimate), against 0.1 for Texas.

From Clarendon to Hedley, CDC publishes no figure by town: each reads Donley County's.

The cities and towns in Donley County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Clarendon1,860−1.6%57.9%
Howardwick370+1.1%11.5%
Hedley264−4.3%8.2%

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).

Donley County, Homes

Homes in Donley County

Donley County is a place of houses on their own lots: 76% of its 1,950 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1971 (1990 for Texas), and 38% date from before 1960. Owners live in 75% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.

Homes in Donley County, Texas, 2019 to 2023
HomesDonley CountyTexas
Housing units1,95011,890,808
Detached houses76%65%
In buildings of 5 or more1%21%
Mobile homes16%7%
Built before 196038%13%
Built since 200019%37%
Middle year built19711990
Owner-occupied75%63%

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