Skip to content
RADON411

Locations and reports

Radon Levels in Klickitat County, Washington

EPA puts Klickitat County in Zone 2, its middle radon zone, and only 20 radon tests from it are on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    48.5%

    33.5 pts above WA

    Klickitat
    48.5%
    Washington
    15.0%

    33 tests, 2014

  • Median result

    3.4pCi/L

    Below action level

    Klickitat
    3.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2014

  • Tests reported

    33

    13th of 14 by tests

    Klickitat
    33
    King
    689

    Reported to CDC before any fix, 2014

  • 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 Washington

    1 of 14

    Top quarter

    Klickitat
    48.5%
    Klickitat
    48.5%

    By share, of 14 with 30+ tests

Read a result for Klickitat County

Starts at Klickitat County's median, 3.4 pCi/L

3.4pCi/L

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

EPA’s reading of 3.4 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. Klickitat County's median reported result, 2014.

Interpret this readingWhat a fix costs

The data

Klickitat County, At a glance

Klickitat County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Klickitat 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 90% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Klickitat County, 2020

Share of reported tests at or above 4 pCi/L, by year, Klickitat County
Share of reported tests at or above 4 pCi/L, by year, Klickitat County
YearShare of reported tests at or above 4 pCi/L
201448.5%
201530.0%
201614.8%
201731.6%
20180.0%
201930.4%
202030.0%

2020: 30.0%. Across these years the share ran from 0.0% to 48.5%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 20 tests were reported to CDC for Klickitat County over 2020, 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: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).

How to read these figures

Klickitat County, Compared

Klickitat County radon figures, compared

Calculated by Radon411

In Klickitat County, about 5 in 10 reported tests in 2014 (16 of 33) were at or above EPA's action level. Against the national pool of 34.9%, the gap is 13.6 points higher. Across 36 Washington counties pooled together, 15.0% of tests reached that level, so Klickitat County runs 33.5 points above its state.

The newest figure, in 2020, counts only 20 tests (30.0% at or above 4 pCi/L), too few to compare, so this reading uses the 33-test figure.

Of 2 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 5.3% (Benton County) to 30.9% (Hood River County, OR). By share, Klickitat County is 1st of 14 Washington counties with 30 or more tests for the same period.

Half the tests came in under 3.4 pCi/L and half over it; the single highest reached 18.7 pCi/L. Below the action level, 14 tests (42.4%) came in under 2 pCi/L, against 72.8% statewide, and 3 tests (9.1%) fell between 2 and 4, against 12.2% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 48.5% share point the same way here. USGS geology rates 90% of the county's land moderate radon potential.

The busiest year on file was 2014, with 33 tests reported; the quietest, 2015, had 10.

Klickitat County against Washington, the United States and nearby counties, 2014
AreaTestsAt or above 4 pCi/LMedianDifference from Klickitat County
Klickitat County3348.5%3.4 pCi/LThis county
Washington, pooled36 counties, pooled3,15315.0%Not pooled−33.5 points
United States, pooled925 counties, pooled517,29334.9%Not pooled−13.6 points
Spokane Countyhighest in the state60034.7%2.2 pCi/L−13.8 points
Skagit Countylowest in the state300.0%0.5 pCi/L−48.5 points
Sherman County, ORborders it333.3%1.5 pCi/L−15.2 points
Hood River County, ORborders it5530.9%1.8 pCi/L−17.6 points
Skamania County, WAborders it825.0%2.7 pCi/L−23.5 points
Wasco County, ORborders it137.7%1.2 pCi/L−40.8 points
Benton County, WAborders it1135.3%0.7 pCi/L−43.2 points
Yakima County, WAborders it210.0%0.8 pCi/L−48.5 points
Where Klickitat County's reported results fell, 2014, beside Washington and the United States
ResultKlickitat County testsKlickitat County shareWashington shareU.S. shareAgainst Washington
Under 2 pCi/L1442.4%72.8%40.0%−30.4 points
2 to 4 pCi/L39.1%12.2%25.1%−3.1 points
4 pCi/L and above1648.5%15.0%34.9%+33.5 points
Klickitat County ranked among the 14 Washington counties with 30 or more tests, by share at or above 4 pCi/L, 2014
CountyRankTestsAt or above 4 pCi/LMedian
Klickitat County1 of 143348.5%3.4 pCi/L
Spokane County2 of 1460034.7%2.2 pCi/L
Cowlitz County3 of 1413222.7%1.0 pCi/L
Clark County4 of 1457118.6%1.1 pCi/L
Pierce County5 of 1421515.3%0.9 pCi/L
Whitman County6 of 147812.8%0.7 pCi/L
Thurston County7 of 141126.3%0.6 pCi/L
Benton County8 of 141135.3%0.7 pCi/L
Snohomish County9 of 141303.8%0.5 pCi/L
Lewis County10 of 14712.8%0.4 pCi/L
King County11 of 146892.2%0.4 pCi/L
Klickitat County radon tests by year, against Washington's pooled share
YearTestsAt or above 4 pCi/LMedianHighestWashington, pooledChange from the row before
20202030.0%2.2 pCi/L43.6 pCi/L19.0%−0.4 points
20192330.4%3.2 pCi/L15.9 pCi/L20.9%+30.4 points
2018130.0%1.6 pCi/L3.2 pCi/L16.1%−31.6 points
20171931.6%2.0 pCi/L9.5 pCi/L19.1%+16.8 points
20162714.8%2.1 pCi/L36.5 pCi/L16.6%−15.2 points
20151030.0%2.9 pCi/L17.7 pCi/L17.4%−18.5 points
20143348.5%3.4 pCi/L18.7 pCi/L15.0%First on file

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

Klickitat County, Geology

The ground under Klickitat County

Predicted

Most of the ground under Klickitat County is one class on USGS's geologic map: 90.2% of its land is moderate radon potential, with 9.8% low. The map puts 86.4% of Klickitat County in the area it calls Columbia Basin and 9.8% in Cascade Mountains, with 2 smaller areas beside them. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 6, in the low band (5 to 8).

USGS's geologic areas under Klickitat County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Columbia BasinBasaltic rocks low in uranium content. Uranium content of soils is moderately elevated.Moderate1086.4%
Cascade MountainsNorthern Cascade Mountains are Mesozoic metamorphic rocks intruded by Mesozoic and Tertiary granitic rocks. Southern Cascade Mountains are composed primarily of Tertiary and Holocene volcanic rocks.Low69.8%
Columbia River GorgeRiver and lacustrine delta deposits and volcanic debris flows.Moderate93.2%
Deschutes Umatilla PlateauTertiary basalt, basaltic breccia, tuffaceous sedimentary rocks and tuff. Elevated uranium in soils.Moderate90.6%

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

Klickitat County beside the ground around it

Across Washington 13.7% of the land is rated high; none of Klickitat County's is. Of the 8 counties that border it, 5 have more moderate-potential ground, Benton County the most at 100%.

Share of land by USGS radon potential: Klickitat County, the 8 counties bordering it and Washington
AreaEPA zoneLow potentialModerate potentialHigh potential
Klickitat CountyZone 29.8%90.2%None
Sherman County, ORZone 2None100%None
Gilliam County, ORZone 2None100%None
Wasco County, ORZone 25.0%95.0%None
Hood River County, ORZone 241.1%58.9%None
Yakima CountyZone 219.7%80.3%None
Skamania CountyZone 175.5%24.0%None
Morrow County, ORZone 2None100%None
Benton CountyZone 2None100%None
Washington38 counties, pooled by land areaVaries46.4%39.0%13.7%

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

Local help

Klickitat County, Local resources

Radon testing and mitigation in Klickitat County

What Washington's program says
Phone
360-236-3200
Email
doh.radon@doh.wa.gov

What it means

Klickitat County, Questions

Questions about radon in Klickitat County

Are radon levels high in Klickitat County?

In 2020, 30.0% of the radon tests reported to CDC for Klickitat County, Washington were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 14 Washington counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 15.0%.

Which counties border Klickitat County?

Klickitat County borders 8 counties: Sherman County, OR, Gilliam County, OR, Wasco County, OR, Hood River County, OR, Yakima County, WA, Skamania County, WA, Morrow County, OR and Benton County, WA.

Products

Klickitat County, Products

Testing a home in Klickitat County

In Klickitat County, 48.5% of 33 tests reported to CDC in 2014 reached 4 pCi/L, against 15.0% pooled across Washington. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Klickitat County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Klickitat County homes, compared

Explore

Klickitat County, Bordering counties

Counties bordering Klickitat County

Calculated by Radon411

Klickitat County, Cities and towns

Cities and towns in Klickitat County

Klickitat County is growing: the Census Bureau puts it at 24,331 residents on July 1, 2025, up 6.6% from 22,817 in 2020. That works out to 13 people per square mile of land. No town dominates: Goldendale, the largest, has 3,528 residents, 14.5% of the total. Together its 3 incorporated places hold 29.3% of those residents; the other 70.7% live outside any of them. Testing is reported here more often than across the state: CDC's 33 reported tests for 2014 come to 1.4 for every 1,000 residents (2025 estimate), against 0.4 for Washington.

From Goldendale to Bingen, CDC publishes no figure by town: each reads Klickitat County's.

The cities and towns in Klickitat County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Goldendale3,528+2.1%14.5%
White Salmon2,655+4.4%10.9%
Bingen952+21.9%3.9%

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).

Klickitat County, Homes

Homes in Klickitat County

Of Klickitat County's 10,722 homes, 74% are detached houses, against 62% across Washington; 17% are mobile homes. Half of its homes were built before 1983, close to Washington's 1984: 28% date from before 1960 and 27% from 2000 or later. Owners live in 76% of the occupied homes (Washington: 64%), so for most households a test and a fix are their own to order.

Homes in Klickitat County, Washington, 2019 to 2023
HomesKlickitat CountyWashington
Housing units10,7223,262,667
Detached houses74%62%
In buildings of 5 or more2%22%
Mobile homes17%6%
Built before 196028%21%
Built since 200027%28%
Middle year built19831984
Owner-occupied76%64%

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