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Radon Levels in Power County, Idaho

EPA puts Power County in Zone 2, its middle radon zone, and 26.8% of its 41 reported radon tests (2008 to 2017, laboratory totals) were 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

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  • Share at 4+ pCi/L

    26.8%

    14.7 pts below ID

    Power
    26.8%
    Idaho
    41.5%

    41 tests, 2008 to 2017

  • Median result

    2.5pCi/L

    Below action level

    Power
    2.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    41

    32nd of 37 by tests

    Power
    41
    Ada
    3,030

    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 Idaho

    24 of 37

    Middle half

    Power
    26.8%
    Bear Lake
    78.1%

    By share, of 37 with 30+ tests

Read a result for Power County

Starts at Power County's median, 2.5 pCi/L

2.5pCi/L

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

EPA’s reading of 2.5 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Power County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Power County, At a glance

Power County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Power 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 Power County, 2008 to 2017, laboratory

Reported results by concentration band, Power County, 2008 to 2017, laboratory
Under 2 pCi/L: 32%2 to 4 pCi/L: 41%4 pCi/L and above: 27%

Of 41 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Power County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1331.7%
2 to 4 pCi/L1741.5%
4 pCi/L and above1126.8%
What these figures count

These are the 41 tests reported to CDC for Power 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

Power County, Compared

Power County radon figures, compared

Calculated by Radon411

Power County's 41 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.5 pCi/L and a maximum of 79.6 pCi/L, and 26.8% reached 4 pCi/L. Idaho as a whole (44 Idaho counties, pooled) comes to 41.5%: 14.7 points higher than here.

Among its state's counties it ranks 24th of 37 Idaho counties with 30 or more tests for the same period. Statewide for the same period, Bear Lake County reported the highest share (78.1%) and Payette County the lowest (4.9%).

Below the action level, 13 tests (31.7%) came in under 2 pCi/L, against 31.5% statewide, and 17 tests (41.5%) fell between 2 and 4, against 26.9% statewide. CDC's ten-year totals for Power County went from 38 tests (2005 to 2014) to 41 (2008 to 2017), the share going from 28.9% to 26.8%.

EPA's 1993 zone map puts Power County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 41.9% in Bannock County to 59.5% in Cassia County.

Power County against Idaho, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Power County
Power County4126.8%2.5 pCi/LThis county
Idaho, pooled44 counties, pooled12,96141.5%Not pooled+14.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+8.9 points
Bear Lake Countyhighest in the state3278.1%7.8 pCi/L+51.3 points
Payette Countylowest in the state614.9%1.5 pCi/L−21.9 points
Oneida County, IDborders it2774.1%6.5 pCi/L+47.3 points
Cassia County, IDborders it12159.5%5.4 pCi/L+32.7 points
Blaine County, IDborders it35257.7%5.3 pCi/L+30.9 points
Bingham County, IDborders it44652.0%4.2 pCi/L+25.2 points
Bannock County, IDborders it73241.9%3.2 pCi/L+15.1 points
Where Power County's reported results fell, 2008 to 2017, laboratory, beside Idaho and the United States
ResultPower County testsPower County shareIdaho shareU.S. shareAgainst Idaho
Under 2 pCi/L1331.7%31.5%39.6%+0.2 points
2 to 4 pCi/L1741.5%26.9%24.7%+14.6 points
4 pCi/L and above1126.8%41.5%35.7%−14.7 points
Power County ranked among the 37 Idaho counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Franklin County19 of 377534.7%3.1 pCi/L
Bonner County20 of 3732133.0%2.3 pCi/L
Clearwater County21 of 373330.3%1.8 pCi/L
Gooding County22 of 376728.4%2.4 pCi/L
Valley County23 of 3712827.3%2.3 pCi/L
Power County24 of 374126.8%2.5 pCi/L
Latah County25 of 3715026.0%1.7 pCi/L
Ada County26 of 373,03025.2%2.4 pCi/L
Twin Falls County27 of 3736924.1%2.4 pCi/L
Owyhee County28 of 373023.3%2.1 pCi/L
Boise County29 of 375822.4%2.0 pCi/L
Power County ten-year laboratory totals, against Idaho's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIdaho, pooledChange from the row before
2008 to 20174126.8%2.5 pCi/L79.6 pCi/L41.5%−2.1 points
2007 to 20163828.9%2.4 pCi/L79.6 pCi/L40.8%−1.7 points
2006 to 20153630.6%2.4 pCi/L79.6 pCi/L41.3%+1.7 points
2005 to 20143828.9%2.3 pCi/L79.6 pCi/L41.1%First on file

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

Power County, Geology

The ground under Power County

Predicted

USGS's geologic map puts all of Power County's mapped land in one class: moderate radon potential. The map puts 62.4% of Power County in the area it calls Basin and Range and 37.6% in Eastern Snake river plain and Malheur-Boise-King Section. USGS gives the first a radon index of 11 and the second 10, both in the moderate band (9 to 11).

USGS's geologic areas under Power County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Basin and RangeCenozoic to Paleozoic sedimentary rocks.Moderate1162.4%
Eastern Snake river plain and Malheur-Boise-King SectionBasalt flows.Moderate1037.6%

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

Power County beside the ground around it

Across Idaho 50.7% of the land is rated high; none of Power County's is. Of the 5 counties that border it, 2 have more high-potential ground, Blaine County the most at 63.2%.

Share of land by USGS radon potential: Power County, the 5 counties bordering it and Idaho
AreaEPA zoneLow potentialModerate potentialHigh potential
Power CountyZone 2None100%None
Bannock CountyZone 2None100%None
Oneida CountyZone 2None99.6%0.4%
Bingham CountyZone 2None100%None
Cassia CountyZone 2None100%None
Blaine CountyZone 1None36.8%63.2%
Idaho44 counties, pooled by land areaVaries8.0%41.3%50.7%

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

Local help

Power County, Local resources

Radon testing and mitigation in Power County

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

What it means

Power County, Questions

Questions about radon in Power County

Are radon levels high in Power County?

Over the 2008 to 2017 laboratory totals, 26.8% of the radon tests reported to CDC for Power County, Idaho were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.5 pCi/L. Of 37 Idaho counties with 30 or more tests for the same period, 23 reported a higher share; pooled, the state comes to 41.5%.

Which counties border Power County?

Power County borders 5 counties: Bannock County, Oneida County, Bingham County, Cassia County and Blaine County.

Products

Power County, Products

Testing a home in Power County

In Power County, 26.8% of 41 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 41.5% pooled across Idaho. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Power County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Power County homes, compared

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Power County, Bordering counties

Counties bordering Power County

Calculated by Radon411

Power County, Cities and towns

Cities and towns in Power County

The Census Bureau estimates 8,246 residents in Power County for July 1, 2025, 366 more than in 2020 (+4.6%). Spread over its land, that is 5.9 people to the square mile. Pocatello, the largest place on its list (58,771 residents in all), extends beyond Power County, so no share of the total is worked out for it. CDC's 41 reported tests for 2008 to 2017 work out to 5.0 per 1,000 residents (2025 estimate), close to Idaho's 6.4.

From Pocatello to Rockland, CDC publishes no figure by town: each reads Power County's.

The cities and towns in Power County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Pocatelloextends beyond Power County58,771+3.4%Counted whole
American Falls4,785+4.8%58.0%
Rockland257+7.5%3.1%

3 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 Power County is counted whole, so it has no share.

Power County, Homes

Homes in Power County

Of Power County's 2,960 homes, 70% are detached houses, against 74% across Idaho; 23% are mobile homes. The homes are older than Idaho's as a whole: half were built before 1975 (1990 for Idaho), and 22% date from before 1960. 75% of occupied homes are lived in by their owner (Idaho: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Power County, Idaho, 2019 to 2023
HomesPower CountyIdaho
Housing units2,960776,683
Detached houses70%74%
In buildings of 5 or more2%9%
Mobile homes23%7%
Built before 196022%18%
Built since 200020%35%
Middle year built19751990
Owner-occupied75%72%

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