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Radon in Coeur d'Alene, Idaho

EPA puts Kootenai County, where Coeur d'Alene is, in Zone 1, its highest radon zone, and high results are common there: 61.0% of the 2,955 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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

    61.0%

    19.5 pts above ID

    Kootenai
    61.0%
    Idaho
    41.5%

    Kootenai, 7th of 37 in ID, 2008 to 2017

  • Median result

    6.0pCi/L

    Action level reached

    Kootenai
    6.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Kootenai's tests, 2008 to 2017

  • Nearest county

    33.0%

    Bonner, 42 miles

    Bonner
    33.0%
    Kootenai
    61.0%

    321 tests, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    Kootenai, where Coeur d'Alene is

  • Tests reported

    2,955

    In Kootenai

    Kootenai
    2,955
    Bonner
    321

    Reported to CDC before any fix, 2008 to 2017

Read a result for Coeur d'Alene

Starts at Kootenai County's median, 6.0 pCi/L

6.0pCi/L

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

EPA’s reading of 6.0 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. Kootenai County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Coeur d'Alene, What is published

What is published for Coeur d'Alene

Information:

Every figure for Coeur d'Alene is a county's

Radon data is published by county, not by city, so for Coeur d'Alene it is Kootenai County's: its EPA zone (Zone 1) and the 2,955 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.

Coeur d'Alene covers 16.1 square miles of land, all of it in Kootenai County. About 58,179 people live there, 3,613 to the square mile.

Coeur d'Alene, Counties

The county Coeur d'Alene lies in

Measured

Kootenai County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.

Kootenai CountyZone 1Highest predicted potential

61.0%
Reported tests at or above 4 pCi/L
6.0 pCi/L
Median reported result
2,955 tests
Tests reported to CDC
None
Yearly figures on file

Kootenai County ranks 7th of 37 Idaho counties with 30 or more tests for that period, 19.5 points above the 41.5% pooled across Idaho's counties, 25.3 points above the national pool of 35.7%.

Measured from the middle of Coeur d'Alene, the nearest counties with a CDC figure for 2008 to 2017, laboratory are Bonner County (42 miles, 33.0% of 321 tests), Shoshone County (49 miles, 63.0% of 81 tests) and Latah County (61 miles, 26.0% of 150 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 20.0% to 63.0%; the farthest of them, Adams County, is 195 miles away at 51.6%.

No business in the directory gives Coeur d'Alene as its address; the Idaho list covers it. Idaho's other cities with a page of their own: Boise.

The counties around Coeur d'Alene

By distance from the middle of Coeur d'Alene; counties with 30 or more tests.

Nearest counties to Coeur d'Alene with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Bonner County42 mi32133.0%2.3 pCi/L
Shoshone County49 mi8163.0%5.7 pCi/L
Latah County61 mi15026.0%1.7 pCi/L
Boundary County75 mi4520.0%2.1 pCi/L
Clearwater County89 mi3330.3%1.8 pCi/L
Nez Perce County95 mi14922.1%2.3 pCi/L
Idaho County143 mi9040.0%2.9 pCi/L
Adams County195 mi3151.6%4.0 pCi/L

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.

Coeur d'Alene, Geology

The ground under Coeur d'Alene

Predicted

USGS's geologic map puts all of Coeur d'Alene's mapped land in one class: high radon potential. 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 Coeur d'Alene
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern Rocky Mountain ProvinceDiorite and granite of the Idaho batholith.High12100%

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

Coeur d'Alene beside its county and Idaho

The ground under Coeur d'Alene is close to Kootenai County's as a whole: 100% rated high against 91.5%. Coeur d'Alene has more high-potential ground than Idaho as a whole: 100% of its land against 50.7%.

Share of land by USGS radon potential: Coeur d'Alene, the county it lies in and Idaho
AreaEPA zoneLow potentialModerate potentialHigh potential
Coeur d'AleneBy countyNoneNone100%
Kootenai CountyZone 1None8.5%91.5%
Idaho44 counties, pooled by land areaVaries8.0%41.3%50.7%

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

Coeur d'Alene, Homes

Homes in Coeur d'Alene

Of Coeur d'Alene's 25,568 homes, 64% are detached houses, against 74% across Kootenai County; 18% are in buildings of five or more homes. Half of its homes were built before 1994, close to Kootenai County's 1995: 17% date from before 1960 and 40% from 2000 or later. 60% of occupied homes are lived in by their owner (Kootenai County: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Coeur d'Alene, Kootenai County, Idaho, 2019 to 2023
HomesCoeur d'AleneKootenai CountyIdaho
Housing units25,56878,013776,683
Detached houses64%74%74%
In buildings of 5 or more18%10%9%
Mobile homes4%8%7%
Built before 196017%11%18%
Built since 200040%41%35%
Middle year built199419951990
Owner-occupied60%72%72%

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

Local help

Coeur d'Alene, Local resources

Local resources for Coeur d'Alene

Who to ask in Idaho: its radon program, test kits and professionals.

The program's own words on licensing are on the Idaho page.

What it means

Coeur d'Alene, Questions

Questions about radon in Coeur d'Alene

What radon zone is Coeur d'Alene in?

EPA's map puts Kootenai County, and with it Coeur d'Alene, in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.

What are radon levels in Coeur d'Alene?

High results are ordinary around Coeur d'Alene: 61.0% of the 2,955 tests reported from Kootenai County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home. The median reported result was 6.0 pCi/L.

Should I test my home in Coeur d'Alene?

Yes. Kootenai County reported about 1,803 of its 2,955 tests at or above 4 pCi/L. That is above Idaho's pooled 41.5%, and ranks Kootenai County 7th of the 37 Idaho counties with 30 or more tests. Which homes they were, no map can say. How to test a home.

What ground is Coeur d'Alene built on, as far as radon goes?

USGS's geologic map puts all of Coeur d'Alene on one named area, "Northern Rocky Mountain Province", rated high for radon potential, radon index 12.

Is radon higher in the counties around Coeur d'Alene?

It depends which way you go. 1 of the 8 nearest counties with a figure report a larger share than Kootenai County's 61.0% and 7 a smaller one: from Boundary County (20.0%, 75 miles off) to Shoshone County (63.0%, 49 miles off).

The answers use the published figures of Kootenai County, the county Coeur d'Alene lies in.

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