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Radon Levels in Oldham County, Texas

EPA puts Oldham County in Zone 2, its middle radon zone. 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

    71.4%

    Randall County

    Randall
    71.4%
    Potter
    20.0%

    2 of 6 neighbours have 30+ tests, 2007 to 2016

  • Nearest county

    20.0%

    Potter County, 40 miles

    Potter
    20.0%
    Texas
    10.4%

    Share at 4+ pCi/L, 70 tests, 2007 to 2016

  • Ground above low

    100.0%

    72.7 pts above Texas

    Oldham
    100.0%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    0

    None published

    A home here needs its own test

  • 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 Oldham 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

Oldham County, At a glance

Oldham County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Oldham 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

No CDC test figures here

CDC has published no radon test figures for Oldham County. Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Randall County reported the largest share at or above 4 pCi/L, 71.4%, and Potter County the smallest, 20.0%.

How to read these figures

Oldham County, Compared

Oldham County radon figures, compared

Calculated by Radon411

Oldham County has no radon test figure of its own from CDC, whose counts over the 2007 to 2016 laboratory totals name 140 other Texas counties and leave it out. Pooled across 140 Texas counties, 10.4% of reported tests reached that level; across every county in the country with a figure, 35.8%.

Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Randall County reported the largest share at or above 4 pCi/L, 71.4%, and Potter County the smallest, 20.0%. Farther out, Lubbock County (132 miles away) at 57.8%, Midland County (246 miles away) at 1.0% and El Paso County (327 miles away) at 0.0% have figures too. 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 Oldham County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Texas, the United States and the counties around Oldham 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
Lubbock Countyhighest in the state12857.8%4.8 pCi/L
Nueces Countylowest in the state450.0%0.6 pCi/L
Moore County, TXborders it2100.0%4.7 pCi/L
Quay County, NMborders it2100.0%5.3 pCi/L
Deaf Smith County, TXborders it475.0%10.9 pCi/L
Randall County, TXborders it8471.4%6.2 pCi/L
Hartley County, TXborders it250.0%6.1 pCi/L
Potter County, TXborders it7020.0%1.1 pCi/L
The nearest Texas counties to Oldham County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Potter County40 mi7020.0%1.1 pCi/L
Randall County50 mi8471.4%6.2 pCi/L
Lubbock County132 mi12857.8%4.8 pCi/L
Midland County246 mi1001.0%0.7 pCi/L
El Paso County327 mi550.0%0.7 pCi/L
Denton County348 mi1817.2%0.9 pCi/L
Tarrant County354 mi31210.6%0.9 pCi/L
Collin County377 mi2847.7%1.0 pCi/L

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

Oldham County, Geology

The ground under Oldham County

Predicted

USGS's geologic map puts all of Oldham County's mapped land in one class: moderate radon potential. The map puts 69.7% of Oldham County in the area it calls Great Plains Pecos Valley Section and 30.3% in Northern High Plains and Plateaus. USGS gives the first a radon index of 9 and the second 10, both in the moderate band (9 to 11).

USGS's geologic areas under Oldham County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Great Plains Pecos Valley SectionQuaternary alluvial and eolian sand and silt.Moderate969.7%
Northern High Plains and PlateausTertiary sandstone, siltstone, shale.Moderate1030.3%

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

Oldham County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Oldham County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Hartley County comes nearest at 100%.

Share of land by USGS radon potential: Oldham County, the 6 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Oldham CountyZone 2None100%None
Deaf Smith CountyZone 2None100%None
Hartley CountyZone 2None100%None
Potter CountyZone 2None100%None
Randall CountyZone 211.2%88.8%None
Moore CountyZone 2None100%None
Quay County, NMZone 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

Oldham County, Local resources

Radon testing and mitigation in Oldham 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

Oldham County, Questions

Questions about radon in Oldham County

Are radon levels high in Oldham County?

No CDC testing statistics are published here for Oldham County, Texas yet. Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Randall County reported the largest share at or above 4 pCi/L, 71.4%, and Potter County the smallest, 20.0%.

Which counties border Oldham County?

Oldham County borders 6 counties: Deaf Smith County, TX, Hartley County, TX, Potter County, TX, Randall County, TX, Moore County, TX and Quay County, NM.

Products

Oldham County, Products

Testing a home in Oldham County

No CDC figure names Oldham County; the nearest county with one, Potter County (40 miles away), reported 20.0% 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 Oldham County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Oldham County homes, compared

Explore

Oldham County, Bordering counties

Counties bordering Oldham County

Calculated by Radon411

Oldham County, Cities and towns

Cities and towns in Oldham County

The Census Bureau estimates 1,783 residents in Oldham County for July 1, 2025, 17 more than in 2020 (+1.0%). Spread over its land, that is 1.2 people to the square mile. Its largest town, Vega, has 891 residents, 50.0% of the total. Together its 2 incorporated places hold 57.6% of those residents; the other 42.4% live outside any of them. CDC publishes no radon test count for Oldham County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).

From Vega to Adrian, CDC publishes no figure by town: each reads Oldham County's.

The cities and towns in Oldham County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Vega891+1.1%50.0%
Adrian136+3.8%7.6%

2 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).

Oldham County, Homes

Homes in Oldham County

Oldham County is a place of houses on their own lots: 77% of its 791 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1966 (1990 for Texas), and 36% date from before 1960. 71% 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 Oldham County, Texas, 2019 to 2023
HomesOldham CountyTexas
Housing units79111,890,808
Detached houses77%65%
In buildings of 5 or more2%21%
Mobile homes17%7%
Built before 196036%13%
Built since 200019%37%
Middle year built19661990
Owner-occupied71%63%

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