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Radon Levels in Oneida County, Idaho

EPA puts Oneida County in Zone 2, its middle radon zone, and only 27 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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  • Share at 4+ pCi/L

    74.2%

    33.4 pts above ID

    Oneida
    74.2%
    Idaho
    40.8%

    31 tests, 2007 to 2016

  • Median result

    6.5pCi/L

    Action level reached

    Oneida
    6.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2007 to 2016

  • Tests reported

    31

    40th of 40 by tests

    Oneida
    31
    Ada
    2,966

    Reported to CDC before any fix, 2007 to 2016

  • 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 Idaho

    2 of 40

    Top quarter

    Oneida
    74.2%
    Bear Lake
    78.1%

    By share, of 40 with 30+ tests

Read a result for Oneida County

Starts at Oneida County's median, 6.5 pCi/L

6.5pCi/L

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

EPA’s reading of 6.5 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. Oneida County's median reported result, 2007 to 2016.

Interpret this readingWhat a fix costs

The data

Oneida County, At a glance

Oneida County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Oneida 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 Oneida County, 2008 to 2017, laboratory

CDC holds 27 reported tests for Oneida County over the 2008 to 2017 laboratory totals, with a median of 6.5 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Oneida County beside the counties around it is how this page reads it.

What these figures count

Only 27 tests were reported to CDC for Oneida 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

Oneida County, Compared

Oneida County radon figures, compared

Calculated by Radon411

More than half: 74.2% of the 31 radon tests reported to CDC for Oneida County over the 2007 to 2016 laboratory totals read at least 4 pCi/L. That places it 2nd of 40 Idaho counties with 30 or more tests for the same period. That is 33.4 points above the 40.8% pooled from 44 Idaho counties.

The newest figure, over the 2008 to 2017 laboratory totals, counts only 27 tests (74.1% at or above 4 pCi/L), too few to compare, so this reading uses the 31-test figure.

The median result, 6.5 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 16.3 pCi/L. The rest split 16.1% under 2 pCi/L and 9.7% from 2 to 4 (Idaho: 32.2% and 27.0%). The reported tests do not follow EPA's Zone 2 label for Oneida County (predicted average between 2 and 4 pCi/L): 74.2% of them reached 4 pCi/L, fewer than that label suggests.

No bordering county with a figure for the same period reported a higher share; the closest is Box Elder County, UT at 65.6%, the lowest Power County at 28.9%. Statewide for the same period, Bear Lake County reported the highest share (78.1%) and Payette County the lowest (5.5%).

CDC's ten-year totals for Oneida County went from 30 tests (2005 to 2014) to 27 (2008 to 2017), the share going from 73.3% to 74.1%.

Nationally, every county with a figure for the same period pools to 35.8%; Oneida County sits 38.4 points above it.

Oneida County against Idaho, the United States and nearby counties, 2007 to 2016, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Oneida County
Oneida County3174.2%6.5 pCi/LThis county
Idaho, pooled44 counties, pooled12,49540.8%Not pooled−33.4 points
United States, pooled2,666 counties, pooled1,939,02535.8%Not pooled−38.4 points
Bear Lake Countyhighest in the state3278.1%6.5 pCi/L+3.9 points
Payette Countylowest in the state555.5%1.3 pCi/L−68.7 points
Box Elder County, UTborders it41965.6%6.1 pCi/L−8.6 points
Cassia County, IDborders it9662.5%5.8 pCi/L−11.7 points
Cache County, UTborders it1,27857.0%4.7 pCi/L−17.2 points
Bannock County, IDborders it72641.7%3.1 pCi/L−32.5 points
Franklin County, IDborders it7630.3%2.8 pCi/L−43.9 points
Power County, IDborders it3828.9%2.4 pCi/L−45.3 points
Where Oneida County's reported results fell, 2007 to 2016, laboratory, beside Idaho and the United States
ResultOneida County testsOneida County shareIdaho shareU.S. shareAgainst Idaho
Under 2 pCi/L516.1%32.2%39.6%−16.1 points
2 to 4 pCi/L39.7%27.0%24.6%−17.3 points
4 pCi/L and above2374.2%40.8%35.8%+33.4 points
Oneida County ranked among the 40 Idaho counties with 30 or more tests, by share at or above 4 pCi/L, 2007 to 2016, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Bear Lake County1 of 403278.1%6.5 pCi/L
Butte County2 of 403174.2%13.0 pCi/L
Oneida County2 of 403174.2%6.5 pCi/L
Custer County4 of 403873.7%6.8 pCi/L
Madison County5 of 4027965.6%6.5 pCi/L
Jefferson County6 of 4018763.6%5.3 pCi/L
Cassia County7 of 409662.5%5.8 pCi/L
Lemhi County8 of 4015360.8%5.1 pCi/L
Kootenai County9 of 402,83460.7%5.9 pCi/L
Shoshone County10 of 408759.8%4.5 pCi/L
Blaine County11 of 4032653.4%4.4 pCi/L
Oneida County ten-year laboratory totals, against Idaho's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIdaho, pooledChange from the row before
2008 to 20172774.1%6.5 pCi/L16.3 pCi/L41.5%−0.1 points
2007 to 20163174.2%6.5 pCi/L16.3 pCi/L40.8%+0.9 points
2006 to 20153073.3%6.2 pCi/L16.3 pCi/L41.3%Level
2005 to 20143073.3%6.2 pCi/L16.3 pCi/L41.1%First on file

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

Oneida County, Geology

The ground under Oneida County

Predicted

Most of the ground under Oneida County is one class on USGS's geologic map: 99.6% of its land is moderate radon potential, with 0.4% high. All of it lies in the area the map calls Basin and Range, to which USGS gives a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Oneida County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Basin and RangeCenozoic to Paleozoic sedimentary rocks.Moderate1199.5%

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

Oneida County beside the ground around it

Idaho as a whole has more high-potential ground than Oneida County: 50.7% of its land, against 0.4% here. Of the 6 counties that border it, 3 have more high-potential ground, Cache County, UT the most at 44.7%.

Share of land by USGS radon potential: Oneida County, the 6 counties bordering it and Idaho
AreaEPA zoneLow potentialModerate potentialHigh potential
Oneida CountyZone 2None99.6%0.4%
Bannock CountyZone 2None100%None
Power CountyZone 2None100%None
Franklin CountyZone 2None68.4%31.6%
Cassia CountyZone 2None100%None
Box Elder County, UTZone 2None97.4%2.6%
Cache County, UTZone 2None55.3%44.7%
Idaho44 counties, pooled by land areaVaries8.0%41.3%50.7%

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

Local help

Oneida County, Local resources

Radon testing and mitigation in Oneida County

What Idaho's program says
Phone
800-445-8647
Email
radon@dhw.idaho.gov

What it means

Oneida County, Questions

Questions about radon in Oneida County

Are radon levels high in Oneida County?

Over the 2008 to 2017 laboratory totals, 74.1% of the radon tests reported to CDC for Oneida County, Idaho were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.5 pCi/L. Of 40 Idaho counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 40.8%.

Which counties border Oneida County?

Oneida County borders 6 counties: Bannock County, ID, Power County, ID, Franklin County, ID, Cassia County, ID, Box Elder County, UT and Cache County, UT.

Products

Oneida County, Products

Testing a home in Oneida County

In Oneida County, 74.2% of 31 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 40.8% pooled across Idaho. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Oneida County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Oneida County homes, compared

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Oneida County, Bordering counties

Counties bordering Oneida County

Calculated by Radon411

Oneida County, Cities and towns

Cities and towns in Oneida County

Oneida County is growing: the Census Bureau puts it at 5,085 residents on July 1, 2025, up 11.4% from 4,564 in 2020. Spread over its land, that is 4.2 people to the square mile. Malad City, its one incorporated place, has 2,338 residents, 46.0% of the total. CDC's 31 reported tests for 2007 to 2016 work out to 6.1 per 1,000 residents (2025 estimate), close to Idaho's 6.2.

Malad City is the one incorporated place here; CDC publishes no figure by town, so it reads Oneida County's.

Malad City, Oneida County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Malad City2,338+1.8%46.0%

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).

Oneida County, Homes

Homes in Oneida County

Oneida County is a place of houses on their own lots: 94% of its 2,062 homes are detached single-family houses, against 74% across Idaho. The homes are older than Idaho's as a whole: half were built before 1963 (1990 for Idaho), and 49% date from before 1960. Owners live in 87% of the occupied homes (Idaho: 72%), so for most households a test and a fix are their own to order.

Homes in Oneida County, Idaho, 2019 to 2023
HomesOneida CountyIdaho
Housing units2,062776,683
Detached houses94%74%
In buildings of 5 or more1%9%
Mobile homes3%7%
Built before 196049%18%
Built since 200019%35%
Middle year built19631990
Owner-occupied87%72%

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