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Radon Levels in Jeff Davis County, Texas

EPA puts Jeff Davis County in Zone 2, its middle radon zone, and only 7 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

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  • Nearest county

    0.0%

    El Paso County, 144 miles

    El Paso
    0.0%
    Texas
    10.4%

    Share at 4+ pCi/L, 55 tests, 2007 to 2016

  • Ground above low

    100.0%

    72.7 pts above Texas

    Jeff Davis
    100.0%
    Texas
    27.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    7

    Too few for a share

    Jeff Davis
    7
    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 Jeff Davis 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

Jeff Davis County, At a glance

Jeff Davis County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Jeff Davis 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

Radon tests reported for Jeff Davis County, 2008 to 2017, laboratory

CDC holds 7 reported tests for Jeff Davis County over the 2008 to 2017 laboratory totals, with a median of 1.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Jeff Davis County beside the counties around it is how this page reads it.

What these figures count

Only 7 tests were reported to CDC for Jeff Davis 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

Jeff Davis County, Compared

Jeff Davis County radon figures, compared

Calculated by Radon411

CDC's largest figure for Jeff Davis County rests on 7 tests over the 2008 to 2017 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 14.3 points and no rank or comparison is drawn from it. Results reached as high as 6.1 pCi/L, with a middle value of 1.1 pCi/L.

The nearest counties with a figure are El Paso County (144 miles away) at 0.0%, Midland County (148 miles away) at 1.0% and Lubbock County (241 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 Jeff Davis 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 Jeff Davis 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
Brewster County, TXborders it450.0%3.0 pCi/L
The nearest Texas counties to Jeff Davis County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
El Paso County144 mi550.0%0.7 pCi/L
Midland County148 mi1001.0%0.7 pCi/L
Lubbock County241 mi12857.8%4.8 pCi/L
Randall County321 mi8471.4%6.2 pCi/L
Bexar County348 mi1976.6%0.6 pCi/L
Potter County348 mi7020.0%1.1 pCi/L
Travis County380 mi4089.3%0.8 pCi/L
Williamson County389 mi982.0%0.7 pCi/L
Jeff Davis County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 2017728.6%1.1 pCi/L6.1 pCi/L10.2%Level
2007 to 2016728.6%1.1 pCi/L6.1 pCi/L10.4%Level
2006 to 2015728.6%1.1 pCi/L6.1 pCi/L11.0%−71.4 points
2005 to 20143100.0%23.4 pCi/L24.5 pCi/L10.6%First on file

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

Jeff Davis County, Geology

The ground under Jeff Davis County

Predicted

USGS's geologic map puts all of Jeff Davis County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Western Mountains and Basins, to which USGS gives a radon index of 9, in the moderate band (9 to 11).

USGS's geologic areas under Jeff Davis County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Western Mountains and BasinsPrecambrian igneous rocks, silicic volcanic rocks, and alluvium.Moderate9100%

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

Jeff Davis County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Jeff Davis County's is. Of the 6 counties that border it, 1 has more high-potential ground, Hudspeth County the most at 8.2%.

Share of land by USGS radon potential: Jeff Davis County, the 6 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Jeff Davis CountyZone 2None100%None
Presidio CountyZone 2None99.8%None
Culberson CountyZone 2None100%None
Reeves CountyZone 20.1%99.9%None
Hudspeth CountyZone 2None91.7%8.2%
Pecos CountyZone 362.2%37.8%None
Brewster CountyZone 212.7%87.2%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

Jeff Davis County, Local resources

Radon testing and mitigation in Jeff Davis 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

Jeff Davis County, Questions

Questions about radon in Jeff Davis County

Are radon levels high in Jeff Davis County?

Over the 2008 to 2017 laboratory totals, 28.6% of the radon tests reported to CDC for Jeff Davis County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.1 pCi/L. Of the 8 nearest counties with a figure, within 389 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 71.4%.

Which counties border Jeff Davis County?

Jeff Davis County borders 6 counties: Presidio County, Culberson County, Reeves County, Hudspeth County, Pecos County and Brewster County.

Products

Jeff Davis County, Products

Testing a home in Jeff Davis County

No CDC figure names Jeff Davis County; the nearest county with one, El Paso County (144 miles away), reported 0.0% 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 Jeff Davis County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Jeff Davis County homes, compared

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Jeff Davis County, Bordering counties

Counties bordering Jeff Davis County

Calculated by Radon411

Jeff Davis County, Cities and towns

Cities and towns in Jeff Davis County

Jeff Davis County has been losing residents: from 1,987 in 2020 to 1,711 on July 1, 2025, a fall of 13.9% by the Census Bureau's estimates. Spread over its land, that is 0.8 people to the square mile. Valentine, its one incorporated place, has 61 residents, 3.6% of the total. Testing is reported here more often than across the state: CDC's 7 reported tests for 2008 to 2017 come to 4.1 for every 1,000 residents (2025 estimate), against 0.1 for Texas.

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

Valentine, Jeff Davis County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Valentine61−15.3%3.6%

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).

Jeff Davis County, Homes

Homes in Jeff Davis County

Jeff Davis County is a place of houses on their own lots: 81% of its 1,483 homes are detached single-family houses, against 65% across Texas. Half of its homes were built before 1990, close to Texas' 1990: 16% date from before 1960 and 36% from 2000 or later. Owners live in 90% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.

Homes in Jeff Davis County, Texas, 2019 to 2023
HomesJeff Davis CountyTexas
Housing units1,48311,890,808
Detached houses81%65%
In buildings of 5 or more0%21%
Mobile homes19%7%
Built before 196016%13%
Built since 200036%37%
Middle year built19901990
Owner-occupied90%63%

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