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Radon Levels in Camas County, Idaho

EPA puts Camas County in Zone 1, its highest radon zone, and only 11 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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  • Highest bordering

    57.7%

    Blaine County

    Blaine
    57.7%
    Gooding
    28.4%

    3 of 4 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    28.4%

    Gooding County, 34 miles

    Gooding
    28.4%
    Idaho
    41.5%

    Share at 4+ pCi/L, 67 tests, 2008 to 2017

  • Ground above low

    100.0%

    8.0 pts above Idaho

    Camas
    100.0%
    Idaho
    92.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    11

    Too few for a share

    Camas
    11
    Needed
    30

    2008 to 2017, laboratory

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

Read a result for Camas 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

Camas County, At a glance

Camas County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Camas County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

CDC holds 11 reported tests for Camas County over the 2008 to 2017 laboratory totals, with a median of 3.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Camas County beside the counties around it is how this page reads it.

What these figures count

Only 11 tests were reported to CDC for Camas 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

Camas County, Compared

Camas County radon figures, compared

Calculated by Radon411

CDC's largest figure for Camas County rests on 11 tests over the 2008 to 2017 laboratory totals, 3 of them at or above 4 pCi/L, so each test moves its share by 9.1 points and no rank or comparison is drawn from it. Results reached as high as 7.6 pCi/L, with a middle value of 3.3 pCi/L.

Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Blaine County reported the largest share at or above 4 pCi/L, 57.7%, and Gooding County the smallest, 28.4%, with Elmore County at 48.1% between. Farther out, Boise County (59 miles away) at 22.4%, Custer County (60 miles away) at 72.7% and Jerome County (60 miles away) at 16.9% have figures too. Pooled across 44 Idaho counties, 41.5% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Bear Lake County reported the highest share (78.1%) and Payette County the lowest (4.9%). EPA's 1993 map puts Camas County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.

Idaho, the United States and the counties around Camas County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
Idaho, pooled44 counties, pooled12,96141.5%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Bear Lake Countyhighest in the state3278.1%7.8 pCi/L
Payette Countylowest in the state614.9%1.5 pCi/L
Blaine County, IDborders it35257.7%5.3 pCi/L
Elmore County, IDborders it15848.1%3.8 pCi/L
Lincoln County, IDborders it2040.0%3.3 pCi/L
Gooding County, IDborders it6728.4%2.4 pCi/L
The nearest Idaho counties to Camas County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Gooding County34 mi6728.4%2.4 pCi/L
Elmore County34 mi15848.1%3.8 pCi/L
Blaine County42 mi35257.7%5.3 pCi/L
Boise County59 mi5822.4%2.0 pCi/L
Custer County60 mi3372.7%6.8 pCi/L
Jerome County60 mi6516.9%1.9 pCi/L
Ada County72 mi3,03025.2%2.4 pCi/L
Minidoka County72 mi7215.3%1.8 pCi/L
Camas County ten-year laboratory totals, against Idaho's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIdaho, pooledChange from the row before
2008 to 20171127.3%3.3 pCi/L7.6 pCi/L41.5%+14.8 points
2007 to 2016812.5%2.0 pCi/L4.3 pCi/L40.8%Level
2006 to 2015812.5%2.0 pCi/L4.3 pCi/L41.3%Level
2005 to 2014812.5%2.0 pCi/L4.3 pCi/L41.1%First on file

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

Camas County, Geology

The ground under Camas County

Predicted

Most of the ground under Camas County is one class on USGS's geologic map: 99.8% of its land is high radon potential, with 0.2% moderate. All of it lies in the area the map calls Northern Rocky Mountain Province, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Camas County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern Rocky Mountain ProvinceDiorite and granite of the Idaho batholith.High1299.8%

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

Camas County beside the ground around it

Camas County has more high-potential ground than Idaho as a whole: 99.8% of its land against 50.7%. Of the 4 counties that border it, none has as large a share of high-potential ground; Elmore County comes nearest at 65.1%.

Share of land by USGS radon potential: Camas County, the 4 counties bordering it and Idaho
AreaEPA zoneLow potentialModerate potentialHigh potential
Camas CountyZone 1None0.2%99.8%
Gooding CountyZone 1None46.2%53.8%
Elmore CountyZone 1None34.9%65.1%
Lincoln CountyZone 2None98.1%1.9%
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

Camas County, Local resources

Radon testing and mitigation in Camas County

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

What it means

Camas County, Questions

Questions about radon in Camas County

Are radon levels high in Camas County?

Over the 2008 to 2017 laboratory totals, 27.3% of the radon tests reported to CDC for Camas County, Idaho were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Blaine County reported the largest share at or above 4 pCi/L, 57.7%, and Gooding County the smallest, 28.4%, with Elmore County at 48.1% between.

Which counties border Camas County?

Camas County borders 4 counties: Gooding County, Elmore County, Lincoln County and Blaine County.

Products

Camas County, Products

Testing a home in Camas County

No CDC figure names Camas County; the nearest county with one, Gooding County (34 miles away), reported 28.4% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 1 the year-round level in Camas County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Camas County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Camas County

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Camas County, Bordering counties

Counties bordering Camas County

Calculated by Radon411

Camas County, Cities and towns

Cities and towns in Camas County

Camas County is growing: the Census Bureau puts it at 1,316 residents on July 1, 2025, up 21.7% from 1,081 in 2020. Spread over its land, that is 1.2 people to the square mile. Fairfield, its one incorporated place, has 501 residents, 38.1% of the total. CDC's 11 reported tests for 2008 to 2017 work out to 8.4 per 1,000 residents (2025 estimate), close to Idaho's 6.4.

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

Fairfield, Camas County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Fairfield501+12.3%38.1%

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).

Camas County, Homes

Homes in Camas County

Camas County is a place of houses on their own lots: 88% of its 694 homes are detached single-family houses, against 74% across Idaho. Half of its homes were built before 1991, close to Idaho's 1990: 27% date from before 1960 and 33% from 2000 or later. Owners live in 76% of the occupied homes (Idaho: 72%), so for most households a test and a fix are their own to order.

Homes in Camas County, Idaho, 2019 to 2023
HomesCamas CountyIdaho
Housing units694776,683
Detached houses88%74%
In buildings of 5 or more0%9%
Mobile homes10%7%
Built before 196027%18%
Built since 200033%35%
Middle year built19911990
Owner-occupied76%72%

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