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Radon Levels in Jefferson County, Oklahoma

EPA puts Jefferson 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

How to test this homeFind a certified tester

  • Nearest county

    8.9%

    Oklahoma County, 102 miles

    Oklahoma
    8.9%
    Oklahoma
    12.6%

    Share at 4+ pCi/L, 135 tests, 2006 to 2015

  • Ground above low

    None

    15.2 pts below Oklahoma

    Jefferson
    0.0%
    Oklahoma
    15.2%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Jefferson
    1
    Needed
    30

    2008 to 2017, 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 Jefferson 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

Jefferson County, At a glance

Jefferson County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Jefferson 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

CDC holds 1 reported test for Jefferson County over the 2008 to 2017 laboratory totals, a result of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Jefferson County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Jefferson 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

Jefferson County, Compared

Jefferson County radon figures, compared

Calculated by Radon411

CDC's largest figure for Jefferson County rests on 1 test over the 2008 to 2017 laboratory totals, 0 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 0.1 pCi/L, with a middle value of 0.1 pCi/L.

The nearest counties with a figure are Oklahoma County (102 miles away) at 8.9%, Tulsa County (175 miles away) at 6.0% and Cherokee County (203 miles away) at 32.0%. Pooled across 53 Oklahoma counties, 12.6% of reported tests reached that level; across every county in the country with a figure, 36.3%.

Statewide for the same period, Delaware County reported the highest share (44.7%) and Tulsa County the lowest (6.0%). EPA's 1993 map puts Jefferson County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.

Oklahoma, the United States and the counties around Jefferson County, 2006 to 2015, laboratory
AreaTestsAt or above 4 pCi/LMedian
Oklahoma, pooled53 counties, pooled86012.6%Not pooled
United States, pooled2,669 counties, pooled1,805,52836.3%Not pooled
Delaware Countyhighest in the state3844.7%2.5 pCi/L
Tulsa Countylowest in the state3006.0%0.9 pCi/L
Carter County, OKborders it825.0%1.5 pCi/L
Stephens County, OKborders it20.0%0.8 pCi/L
Montague County, TXborders it120.0%0.1 pCi/L
The nearest Oklahoma counties to Jefferson County with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Oklahoma County102 mi1358.9%0.9 pCi/L
Tulsa County175 mi3006.0%0.9 pCi/L
Cherokee County203 mi5032.0%1.9 pCi/L
Washington County210 mi5311.3%1.9 pCi/L
Delaware County233 mi3844.7%2.5 pCi/L
Jefferson County ten-year laboratory totals, against Oklahoma's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOklahoma, pooledChange from the row before
2008 to 201710.0%0.1 pCi/L0.1 pCi/L12.7%Level
2007 to 201610.0%0.1 pCi/L0.1 pCi/L12.1%Level
2006 to 201510.0%0.1 pCi/L0.1 pCi/L12.6%Level
2005 to 201410.0%0.1 pCi/L0.1 pCi/L12.0%First on file

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

Jefferson County, Geology

The ground under Jefferson County

Predicted

USGS's geologic map puts all of Jefferson County's mapped land in one class: low radon potential. All of it lies in the area the map calls Central Oklahoma Plains and Hills, to which USGS gives a radon index of 7, in the low band (5 to 8).

USGS's geologic areas under Jefferson County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Oklahoma Plains and HillsNonmarine Permian and Tertiary rocks, including shale, sandstone, and conglomerate in the western part, and Mississippian and Pennsylvanian rocks in the eastern part.Low799.6%

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

Jefferson County beside the ground around it

Across Oklahoma 0.6% of the land is rated high; none of Jefferson County's is. None of the 6 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Jefferson County, the 6 counties bordering it and Oklahoma
AreaEPA zoneLow potentialModerate potentialHigh potential
Jefferson CountyZone 3100%NoneNone
Stephens CountyZone 3100%NoneNone
Montague County, TXZone 3100%NoneNone
Love CountyZone 3100%NoneNone
Cotton CountyZone 3100%NoneNone
Clay County, TXZone 3100%NoneNone
Carter CountyZone 3100%NoneNone
Oklahoma77 counties, pooled by land areaVaries84.8%14.6%0.6%

The map rates the ground, not the air in any home.

Local help

Jefferson County, Local resources

Radon testing and mitigation in Jefferson County

What it means

Jefferson County, Questions

Questions about radon in Jefferson County

Are radon levels high in Jefferson County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Jefferson County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the 5 nearest counties with a figure, within 233 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.

Which counties border Jefferson County?

Jefferson County borders 6 counties: Stephens County, OK, Montague County, TX, Love County, OK, Cotton County, OK, Clay County, TX and Carter County, OK.

Products

Jefferson County, Products

Testing a home in Jefferson County

No CDC figure names Jefferson County; the nearest county with one, Oklahoma County (102 miles away), reported 8.9% of its tests at or above 4 pCi/L over the 2006 to 2015 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 Jefferson County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Jefferson County homes, compared

Explore

Jefferson County, Bordering counties

Counties bordering Jefferson County

Calculated by Radon411

Jefferson County, Cities and towns

Cities and towns in Jefferson County

The Census Bureau estimates 5,431 residents in Jefferson County for July 1, 2025, 116 more than in 2020 (+2.2%). Spread over its land, that is 7.2 people to the square mile. Its largest town, Waurika, has 1,867 residents, 34.4% of the total. Together its 8 incorporated places hold 74.5% of those residents; the other 25.5% live outside any of them. CDC's 1 reported test for 2008 to 2017 work out to 0.2 per 1,000 residents (2025 estimate), close to Oklahoma's 0.2.

From Waurika to Sugden, CDC publishes no figure by town: each reads Jefferson County's.

The cities and towns in Jefferson County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Waurika1,867+1.7%34.4%
Ringling887+2.3%16.3%
Ryan678+2.0%12.5%
Terral284+1.8%5.2%
Cornish112+0.9%2.1%
Hastings109+2.8%2.0%
Addington85+3.7%1.6%
Sugden22Level0.4%

8 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).

Jefferson County, Homes

Homes in Jefferson County

Jefferson County is a place of houses on their own lots: 81% of its 2,742 homes are detached single-family houses, against 73% across Oklahoma. The homes are older than Oklahoma's as a whole: half were built before 1971 (1980 for Oklahoma), and 35% date from before 1960. 72% of occupied homes are lived in by their owner (Oklahoma: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Jefferson County, Oklahoma, 2019 to 2023
HomesJefferson CountyOklahoma
Housing units2,7421,763,036
Detached houses81%73%
In buildings of 5 or more1%12%
Mobile homes9%9%
Built before 196035%21%
Built since 200010%25%
Middle year built19711980
Owner-occupied72%66%

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