Skip to content
RADON411

Locations and reports

Radon Levels in Randall County, Texas

EPA puts Randall County in Zone 2, its middle radon zone, and high results are common there: 69.0% of the 87 radon tests reported to CDC (2008 to 2017, laboratory totals) came back at or above 4 pCi/L. 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

  • Share at 4+ pCi/L

    69.0%

    58.8 pts above TX

    Randall
    69.0%
    Texas
    10.2%

    87 tests, 2008 to 2017

  • Median result

    6.1pCi/L

    Action level reached

    Randall
    6.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    87

    13th of 22 by tests

    Randall
    87
    Harris
    733

    Reported to CDC before any fix, 2008 to 2017

  • 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

  • Rank in Texas

    1 of 22

    Top quarter

    Randall
    69.0%
    Randall
    69.0%

    By share, of 22 with 30+ tests

Read a result for Randall County

Starts at Randall County's median, 6.1 pCi/L

6.1pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 6.1 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. Randall County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Randall County, At a glance

Randall County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Randall 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 89% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Randall County, 2008 to 2017, laboratory
Under 2 pCi/L: 16%2 to 4 pCi/L: 15%4 pCi/L and above: 69%

Of 87 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Randall County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1416.1%
2 to 4 pCi/L1314.9%
4 pCi/L and above6069.0%
What these figures count

These are the 87 tests reported to CDC for Randall County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not 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

Randall County, Compared

Randall County radon figures, compared

Calculated by Radon411

More than half: 69.0% of the 87 radon tests reported to CDC for Randall County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 1st of 22 Texas counties with 30 or more tests for the same period. That is 58.8 points above the 10.2% pooled from 138 Texas counties.

The median result, 6.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 196.2 pCi/L. The rest split 16.1% under 2 pCi/L and 14.9% from 2 to 4 (Texas: 80.3% and 9.6%). The reported tests do not follow EPA's Zone 2 label for Randall County (predicted average between 2 and 4 pCi/L): 69.0% of them reached 4 pCi/L, fewer than that label suggests.

Potter County, the one bordering county with a figure for the same period, reported 23.0%. Statewide for the same period, Lubbock County reported the highest share (55.7%) and Nueces County the lowest (0.0%).

CDC's ten-year totals for Randall County went from 94 tests (2005 to 2014) to 87 (2008 to 2017), the share going from 62.8% to 69.0%.

Nationally, every county with a figure for the same period pools to 35.7%; Randall County sits 33.3 points above it.

Randall County against Texas, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Randall County
Randall County8769.0%6.1 pCi/LThis county
Texas, pooled138 counties, pooled4,61510.2%Not pooled−58.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−33.3 points
Lubbock Countyhighest in the state12255.7%4.8 pCi/L−13.3 points
Nueces Countylowest in the state430.0%0.6 pCi/L−69.0 points
Swisher County, TXborders it4100.0%7.8 pCi/L+31.0 points
Carson County, TXborders it2100.0%36.2 pCi/L+31.0 points
Deaf Smith County, TXborders it683.3%8.2 pCi/L+14.3 points
Potter County, TXborders it7423.0%1.4 pCi/L−46.0 points
Castro County, TXborders it10.0%3.6 pCi/L−69.0 points
Where Randall County's reported results fell, 2008 to 2017, laboratory, beside Texas and the United States
ResultRandall County testsRandall County shareTexas shareU.S. shareAgainst Texas
Under 2 pCi/L1416.1%80.3%39.6%−64.2 points
2 to 4 pCi/L1314.9%9.6%24.7%+5.3 points
4 pCi/L and above6069.0%10.2%35.7%+58.8 points
Randall County ranked among the 22 Texas counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Randall County1 of 228769.0%6.1 pCi/L
Lubbock County2 of 2212255.7%4.8 pCi/L
McLennan County3 of 223023.3%1.1 pCi/L
Potter County4 of 227423.0%1.4 pCi/L
Bell County5 of 223016.7%1.3 pCi/L
Tarrant County6 of 2228413.0%0.9 pCi/L
Travis County7 of 224269.2%0.9 pCi/L
Dallas County8 of 227288.4%0.9 pCi/L
Collin County9 of 222897.6%1.0 pCi/L
Denton County10 of 221926.8%0.9 pCi/L
Bexar County11 of 222016.5%0.6 pCi/L
Randall County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 20178769.0%6.1 pCi/L196.2 pCi/L10.2%−2.4 points
2007 to 20168471.4%6.2 pCi/L93.9 pCi/L10.4%+3.2 points
2006 to 20158868.2%6.0 pCi/L323.1 pCi/L11.0%+5.4 points
2005 to 20149462.8%5.6 pCi/L323.1 pCi/L10.6%First on file

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

Randall County, Geology

The ground under Randall County

Predicted

Most of the ground under Randall County is one class on USGS's geologic map: 88.8% of its land is moderate radon potential, with 11.2% low. The map puts 88.8% of Randall County in the area it calls Northern High Plains and Plateaus and 11.2% 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 Randall County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern High Plains and PlateausTertiary sandstone, siltstone, shale.Moderate1088.8%
Central TexasCretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite.Low711.2%

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

Randall County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Randall County's is. Of the 7 counties that border it, 6 have more moderate-potential ground, Carson County the most at 100%.

Share of land by USGS radon potential: Randall County, the 7 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Randall CountyZone 211.2%88.8%None
Potter CountyZone 2None100%None
Armstrong CountyZone 240.6%59.4%None
Swisher CountyZone 2None100%None
Castro CountyZone 2None100%None
Deaf Smith CountyZone 2None100%None
Carson CountyZone 2None100%None
Oldham 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

Randall County, Local resources

Radon testing and mitigation in Randall 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

Randall County, Questions

Questions about radon in Randall County

Are radon levels high in Randall County?

Over the 2008 to 2017 laboratory totals, 69.0% of the radon tests reported to CDC for Randall County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.1 pCi/L. Of 22 Texas counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 10.2%.

Which counties border Randall County?

Randall County borders 7 counties: Potter County, Armstrong County, Swisher County, Castro County, Deaf Smith County, Carson County and Oldham County.

Products

Randall County, Products

Testing a home in Randall County

In Randall County, 69.0% of 87 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 10.2% pooled across Texas. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Randall County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Randall County homes, compared

Explore

Randall County, Bordering counties

Counties bordering Randall County

Calculated by Radon411

Randall County, Cities and towns

Cities and towns in Randall County

Randall County is growing: the Census Bureau puts it at 152,351 residents on July 1, 2025, up 7.9% from 141,255 in 2020. That works out to 167 people per square mile of land. Amarillo, the largest place on its list (205,130 residents in all), extends beyond Randall County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 87 reported tests for 2008 to 2017 come to 0.6 for every 1,000 residents (2025 estimate), against 0.1 for Texas.

From Amarillo to Palisades, CDC publishes no figure by town: each reads Randall County's.

The cities and towns in Randall County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Amarilloextends beyond Randall County205,130+2.3%Counted whole
Canyon16,518+10.7%10.8%
Lake Tanglewood734+6.8%0.5%
Happyextends beyond Randall County584−1.7%Counted whole
Timbercreek Canyon476+9.9%0.3%
Palisades295+7.3%0.2%

6 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). A place that extends beyond Randall County is counted whole, so it has no share.

Randall County, Homes

Homes in Randall County

Of Randall County's 61,137 homes, 70% are detached houses, against 65% across Texas; 16% are in buildings of five or more homes. Half of its homes were built before 1986, close to Texas' 1990: 13% date from before 1960 and 35% from 2000 or later. 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 Randall County, Texas, 2019 to 2023
HomesRandall CountyTexas
Housing units61,13711,890,808
Detached houses70%65%
In buildings of 5 or more16%21%
Mobile homes7%7%
Built before 196013%13%
Built since 200035%37%
Middle year built19861990
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.