Radon levels in Idaho

Verified county-level radon indicators are available for 44 Idaho counties. Select a county for its source period and sample details.

High results are most common in Bear Lake County (78%) and least common in Payette County (5%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 44 of 44 counties have data
Ada County: 25% of tests at or above 4 pCi/L · 3,030 testsAdams County: 52% of tests at or above 4 pCi/L · 31 testsBannock County: 42% of tests at or above 4 pCi/L · 732 testsBear Lake County: 78% of tests at or above 4 pCi/L · 32 testsBenewah County: 31% of tests at or above 4 pCi/L · 29 testsBingham County: 52% of tests at or above 4 pCi/L · 446 testsBlaine County: 58% of tests at or above 4 pCi/L · 352 testsBoise County: 22% of tests at or above 4 pCi/L · 58 testsBonner County: 33% of tests at or above 4 pCi/L · 321 testsBonneville County: 40% of tests at or above 4 pCi/L · 1,117 testsBoundary County: 20% of tests at or above 4 pCi/L · 45 testsButte County: 76% of tests at or above 4 pCi/L · 29 testsCamas County: 27% of tests at or above 4 pCi/L · 11 testsCanyon County: 11% of tests at or above 4 pCi/L · 563 testsCaribou County: 44% of tests at or above 4 pCi/L · 57 testsCassia County: 60% of tests at or above 4 pCi/L · 121 testsClark County: 75% of tests at or above 4 pCi/L · 4 testsClearwater County: 30% of tests at or above 4 pCi/L · 33 testsCuster County: 73% of tests at or above 4 pCi/L · 33 testsElmore County: 48% of tests at or above 4 pCi/L · 158 testsFranklin County: 35% of tests at or above 4 pCi/L · 75 testsFremont County: 50% of tests at or above 4 pCi/L · 101 testsGem County: 20% of tests at or above 4 pCi/L · 99 testsGooding County: 28% of tests at or above 4 pCi/L · 67 testsIdaho County: 40% of tests at or above 4 pCi/L · 90 testsJefferson County: 67% of tests at or above 4 pCi/L · 207 testsJerome County: 17% of tests at or above 4 pCi/L · 65 testsKootenai County: 61% of tests at or above 4 pCi/L · 2,955 testsLatah County: 26% of tests at or above 4 pCi/L · 150 testsLemhi County: 65% of tests at or above 4 pCi/L · 112 testsLewis County: 50% of tests at or above 4 pCi/L · 6 testsLincoln County: 40% of tests at or above 4 pCi/L · 20 testsMadison County: 64% of tests at or above 4 pCi/L · 314 testsMinidoka County: 15% of tests at or above 4 pCi/L · 72 testsNez Perce County: 22% of tests at or above 4 pCi/L · 149 testsOneida County: 74% of tests at or above 4 pCi/L · 27 testsOwyhee County: 23% of tests at or above 4 pCi/L · 30 testsPayette County: 5% of tests at or above 4 pCi/L · 61 testsPower County: 27% of tests at or above 4 pCi/L · 41 testsShoshone County: 63% of tests at or above 4 pCi/L · 81 testsTeton County: 53% of tests at or above 4 pCi/L · 473 testsTwin Falls County: 24% of tests at or above 4 pCi/L · 369 testsValley County: 27% of tests at or above 4 pCi/L · 128 testsWashington County: 21% of tests at or above 4 pCi/L · 67 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

CountyTests% ≥ 4 pCi/LMedian (pCi/L)EPA zone (1993)Source
Ada County3,03025%2.4Zone 2Radon test results from laboratories through 2017
Adams County3152%4.0Zone 3Radon test results from laboratories through 2017
Bannock County73242%3.2Zone 2Radon test results from laboratories through 2017
Bear Lake County3278%7.8Zone 2Radon test results from laboratories through 2017
Benewah County2931%2.4Zone 1Radon test results from laboratories through 2017
Bingham County44652%4.2Zone 2Radon test results from laboratories through 2017
Blaine County35258%5.3Zone 1Radon test results from laboratories through 2017
Boise County5822%2.0Zone 1Radon test results from laboratories through 2017
Bonner County32133%2.3Zone 1Radon test results from laboratories through 2017
Bonneville County1,11740%3.4Zone 2Radon test results from laboratories through 2017
Boundary County4520%2.1Zone 1Radon test results from laboratories through 2017
Butte County2976%12.8Zone 1Radon test results from laboratories through 2017
Camas County1127%3.3Zone 1Radon test results from laboratories through 2017
Canyon County56311%1.6Zone 2Radon test results from laboratories through 2017
Caribou County5744%3.4Zone 2Radon test results from laboratories through 2017
Cassia County12160%5.4Zone 2Radon test results from laboratories through 2017
Clark County475%14.1Zone 1Radon test results from laboratories through 2017
Clearwater County3330%1.8Zone 1Radon test results from laboratories through 2017
Custer County3373%6.8Zone 1Radon test results from laboratories through 2017
Elmore County15848%3.8Zone 1Radon test results from laboratories through 2017
Franklin County7535%3.1Zone 2Radon test results from laboratories through 2017
Fremont County10150%3.9Zone 1Radon test results from laboratories through 2017
Gem County9920%1.9Zone 3Radon test results from laboratories through 2017
Gooding County6728%2.4Zone 1Radon test results from laboratories through 2017
Idaho County9040%2.9Zone 1Radon test results from laboratories through 2017
Jefferson County20767%5.7Zone 2Radon test results from laboratories through 2017
Jerome County6517%1.9Zone 2Radon test results from laboratories through 2017
Kootenai County2,95561%6.0Zone 1Radon test results from laboratories through 2017
Latah County15026%1.7Zone 1Radon test results from laboratories through 2017
Lemhi County11265%5.2Zone 1Radon test results from laboratories through 2017
Lewis County650%3.8Zone 3Radon test results from laboratories through 2017
Lincoln County2040%3.3Zone 2Radon test results from laboratories through 2017
Madison County31464%6.2Zone 2Radon test results from laboratories through 2017
Minidoka County7215%1.8Zone 2Radon test results from laboratories through 2017
Nez Perce County14922%2.3Zone 3Radon test results from laboratories through 2017
Oneida County2774%6.5Zone 2Radon test results from laboratories through 2017
Owyhee County3023%2.1Zone 2Radon test results from laboratories through 2017
Payette County615%1.5Zone 2Radon test results from laboratories through 2017
Power County4127%2.5Zone 2Radon test results from laboratories through 2017
Shoshone County8163%5.7Zone 1Radon test results from laboratories through 2017
Teton County47353%4.4Zone 2Radon test results from laboratories through 2017
Twin Falls County36924%2.4Zone 2Radon test results from laboratories through 2017
Valley County12827%2.3Zone 1Radon test results from laboratories through 2017
Washington County6721%2.1Zone 3Radon test results from laboratories through 2017

Test your home

County figures show how often tests come back high, not the level in your home. Only a test tells you that: see how to test for radon.

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