Skip to content
RADON411

Locations and reports

Utah Radon Map and Levels by County

Utah's counties span EPA Zones 1 and 2. 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

    37.7%

    13.8 pts above U.S.

    Utah
    37.7%
    U.S.
    23.9%

    41,004 tests across 28 counties, 2022

  • Rank among states

    4 of 16

    Ten highest states

    Utah
    37.7%
    Wisconsin
    42.9%

    By share, every state pooled the same way, 2022

  • Counties in EPA Zone 1

    7 of 29

    Some at highest potential

    Zone 1
    7
    Zone 2
    22

    Most counties sit in Zone 2; Zone 1 is the highest potential

  • Highest county

    88.9%

    Beaver County

    Beaver
    88.9%
    Washington
    9.4%

    Counties with 30+ tests, 2022

Read a result for Utah

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. 37.7% of Utah's reported tests reached 4 pCi/L, 2022.

Interpret this readingWhat a fix costs

The data

Utah, At a glance

Utah at a glance

Predicted: EPA radon zone

29 of 29 counties classified

EPA classifies counties, not states. Of the 29 counties in Utah with a zone, 7 are in Zone 1 and 22 in Zone 2.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L7 of 29 counties · 24.1%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L22 of 29 counties · 75.9%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Utah's radon test figures by county: 29 of its 29 counties have one. Each one's share is in the county list.

How to read these figures

Utah, Compared

Utah radon figures, compared

Calculated by Radon411
Utah, 2022
37.7%
of 41,004 tests at or above 4 pCi/L, pooled
Against the U.S.
+13.8points
23.9% pooled
Rank among the states
4 of 16
1 is the highest share
Counties with 30 or more tests
24
Highest
88.9%
Beaver County
Lowest
9.4%
Washington County

Utah pools to 37.7%: that share of 41,004 reported tests from 28 counties in 2022 reached EPA's action level. Nationally the pooled share is 23.9%: 13.8 points lower than here.

Among 16 states pooled the same way it ranks 4th, with Colorado (38.6%) above it and Nebraska (34.0%) below. Beaver County reports the highest share (88.9% of 81 tests) and Washington County the lowest (9.4%); the most tests came from Salt Lake County, 15,201 of them at 34.4%.

Year by year (10 years pooled), the share went from 43.4% (2014) to 36.1% (2023), down 7.2 points, with 2014 the highest at 43.4%. By band, 9 counties at 50% or more, 11 counties at 30% to 50%, 3 counties at 15% to 30%, 1 county at 5% to 15%.

EPA's 1993 map puts 7 of its 29 classified counties in Zone 1; against that, 37.7% of the tests reported since reached 4 pCi/L.

Utah ranked among 16 states by pooled share of tests at or above 4 pCi/L, 2022
StateRankCountiesTestsAt or above 4 pCi/L
Wisconsin1 of 167213,31542.9%
Missouri2 of 16982,56940.8%
Colorado3 of 166028,08538.6%
Utah4 of 162841,00437.7%
Nebraska5 of 168211,19334.0%
Kansas6 of 169618,38532.0%
Minnesota7 of 168723,45831.6%
Tennessee8 of 16789,60623.8%
Florida9 of 165461,39222.8%
New York10 of 16421,37722.4%
Oregon11 of 16336,83420.2%
Utah's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2022
CountyRankTestsAt or above 4 pCi/L
Beaver County1 of 248188.9%
Box Elder County2 of 2444463.5%
Sanpete County3 of 2423757.0%
Morgan County4 of 2420156.7%
Juab County5 of 247556.0%
Tooele County6 of 2497555.1%
Cache County7 of 241,36552.7%
Wasatch County8 of 2460951.7%
Duchesne County9 of 2412951.2%
Sevier County10 of 2415949.1%
Washington County24 of 249249.4%
Grand County23 of 2441117.5%
Iron County22 of 2430317.8%
Millard County21 of 2412626.2%
Weber County20 of 242,31930.1%
Utah's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2022
ShareCountiesTheir testsFor example
50% or more94,116Beaver County, Box Elder County, Sanpete County
30% to 50%1135,064Sevier County, San Juan County, Uintah County
15% to 30%3840Millard County, Iron County, Grand County
5% to 15%1924Washington County
Under 5%00None
Utah pooled by year, against the United States
YearCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
20232927,42236.1%33.4%−1.6 points
20222841,00437.7%23.9%+3.5 points
2021275,30434.2%24.4%−3.4 points
2020264,23637.6%25.5%−0.1 points
2019232,51537.7%29.0%+1.1 points
2018284,68836.6%29.1%−1.6 points
2017276,05838.2%31.7%−1.6 points
2016288,77539.8%31.2%−2.5 points
2015285,88542.3%35.5%−1.1 points
2014263,40943.4%34.9%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Utah, Counties

Utah counties by EPA zone

Predicted

All 29 counties, grouped by the zone EPA predicts and ordered by their reported share at or above 4 pCi/L, under Utah's map. Each county has a page of its own.

Utah radon map by county: EPA radon zones. Map of Utah's 29 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber. 7 in Zone 1, 22 in Zone 2, 0 in Zone 3.
Utah radon map by countyEPA radon zones for Utah's counties: 7 counties in Zone 1, 22 counties in Zone 2, 0 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Utah, 2022

Zone 1: highest predicted potential7

Local help

Utah, Local resources

Local resources in Utah

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

What Utah's program says
Phone
(801) 536-0091
Disclosure when a home is sold or rented
Utah requires that sellers disclose "Hazardous Conditions: Are there any hazardous conditions on the Property such as Radon gas in house or well?"

What it means

Utah, Questions

Questions about radon in Utah

Is radon a problem in Utah?

Of the 29 counties in Utah that EPA's Map of Radon Zones classifies, 7 carry Zone 1 (the highest predicted potential), 22 Zone 2 and 0 Zone 3. Pooled from 28 counties, 37.7% of the 41,004 radon tests reported to CDC in 2022 were at or above 4 pCi/L, 4th of 16 states.

Which Utah counties are in EPA radon Zone 1?

7 counties are in Zone 1: Carbon County, Duchesne County, Grand County, Piute County, Sanpete County, Sevier County, Uintah County.

Which Utah counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2022: Beaver County 88.9% (81 tests), Box Elder County 63.5% (444 tests), Sanpete County 57.0% (237 tests), Morgan County 56.7% (201 tests), Juab County 56.0% (75 tests).

Which EPA region is Utah in?

Utah is in EPA Region 8: Mountains and Plains.

Products

Utah, Products

Testing a home in Utah

37.7% of the 41,004 tests reported to CDC for Utah in 2022 reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Utah; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Utah homes, compared

Explore

Cities in Utah with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.