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Radon in Las Vegas, Nevada

EPA puts Clark County, where Las Vegas is, in Zone 3, its lowest radon zone, and most reported tests there come back low, though 8.1% of 2,598 (2008 to 2017, laboratory totals) reached 4 pCi/L. 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

    8.1%

    14.7 pts below NV

    Clark
    8.1%
    Nevada
    22.8%

    Clark, 11th of 11 in NV, 2008 to 2017

  • Median result

    0.9pCi/L

    Below action level

    Clark
    0.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Clark's tests, 2008 to 2017

  • Nearest county

    11.1%

    Nye, 141 miles

    Nye
    11.1%
    Clark
    8.1%

    81 tests, 2008 to 2017

  • EPA radon zone

    Zone 3

    Low potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    Clark, where Las Vegas is

  • Tests reported

    2,598

    In Clark

    Clark
    2,598
    Nye
    81

    Reported to CDC before any fix, 2008 to 2017

Read a result for Las Vegas

Starts at Clark County's median, 0.9 pCi/L

0.9pCi/L

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

EPA’s reading of 0.9 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Clark County's median reported result, 2008 to 2017.

Interpret this reading

The data

Las Vegas, What is published

What is published for Las Vegas

Information:

Every figure for Las Vegas is a county's

Radon data is published by county, not by city, so for Las Vegas it is Clark County's: its EPA zone (Zone 3) and the 2,598 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.

Las Vegas covers 142 square miles of land, all of it in Clark County. About 679,817 people live there, 4,793 to the square mile.

Las Vegas, Counties

The county Las Vegas lies in

Measured

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

Clark CountyZone 3Lower predicted potential

8.1%
Reported tests at or above 4 pCi/L
0.9 pCi/L
Median reported result
2,598 tests
Tests reported to CDC
None
Yearly figures on file

Clark County ranks 11th of 11 Nevada counties with 30 or more tests for that period, 14.7 points below the 22.8% pooled across Nevada's counties, 27.6 points below the national pool of 35.7%.

Measured from the middle of Las Vegas, the nearest counties with a CDC figure for 2008 to 2017, laboratory are Nye County (141 miles, 11.1% of 81 tests), White Pine County (222 miles, 39.1% of 69 tests) and Churchill County (285 miles, 12.4% of 161 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 11.1% to 40.6%; the farthest of them, Elko County, is 339 miles away at 40.3%.

No business in the directory gives Las Vegas as its address; the Nevada list covers it. Nevada's other cities with a page of their own: Reno.

The counties around Las Vegas

By distance from the middle of Las Vegas; counties with 30 or more tests.

Nearest counties to Las Vegas with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Nye County141 mi8111.1%1.3 pCi/L
White Pine County222 mi6939.1%3.1 pCi/L
Churchill County285 mi16112.4%2.1 pCi/L
Lyon County288 mi30330.4%2.6 pCi/L
Douglas County302 mi1,61737.0%3.1 pCi/L
Carson City317 mi73140.6%3.3 pCi/L
Storey County322 mi3417.6%2.3 pCi/L
Elko County339 mi15940.3%3.1 pCi/L

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

Las Vegas, Geology

The ground under Las Vegas

Predicted

Most of the ground under Las Vegas is one class on USGS's geologic map: 93.5% of its land is moderate radon potential, with 6.5% low. The map puts 93.5% of Las Vegas in the area it calls Great Basin and 6.5% in Great Basin. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Las Vegas
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Great BasinSandstone, shale, limestone, mafic volcanic rocks.Moderate1193.5%
Great BasinSandstone, shale, limestone, mafic volcanic rocks.Low86.5%

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

Las Vegas beside its county and Nevada

Las Vegas sits on more moderate-potential ground than Clark County as a whole: 93.5% of the city against 37.7% of the county. Across Nevada 17.3% of the land is rated high; none of Las Vegas' is.

Share of land by USGS radon potential: Las Vegas, the county it lies in and Nevada
AreaEPA zoneLow potentialModerate potentialHigh potential
Las VegasBy county6.5%93.5%None
Clark CountyZone 362.3%37.7%None
Nevada17 counties, pooled by land areaVaries7.9%74.8%17.3%

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

Las Vegas, Homes

Homes in Las Vegas

Of Las Vegas' 263,958 homes, 62% are detached houses, against 60% across Clark County; 23% are in buildings of five or more homes. Half of its homes were built before 1994, close to Clark County's 1997: 6% date from before 1960 and 32% from 2000 or later. 56% of occupied homes are lived in by their owner (Clark County: 57%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Las Vegas, Clark County, Nevada, 2019 to 2023
HomesLas VegasClark CountyNevada
Housing units263,958935,9601,307,338
Detached houses62%60%60%
In buildings of 5 or more23%24%22%
Mobile homes1%3%6%
Built before 19606%3%5%
Built since 200032%43%40%
Middle year built199419971996
Owner-occupied56%57%59%

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

Local help

Las Vegas, Local resources

Local resources for Las Vegas

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

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

What it means

Las Vegas, Questions

Questions about radon in Las Vegas

What radon zone is Las Vegas in?

Las Vegas takes its zone from Clark County, which EPA puts in Zone 3, the map's lowest class: a predicted county average under 2 pCi/L. A low zone does not clear a house: homes over the action level are found in all three.

What are radon levels in Las Vegas?

Reported levels around Las Vegas run low: 8.1% of 2,598 tests from Clark County for 2008 to 2017 (laboratory totals) reached 4 pCi/L. The median reported result was 0.9 pCi/L. Low is not none.

Should I test my home in Las Vegas?

Yes, even here. Clark County reported 210 of 2,598 tests at or above 4 pCi/L. That is below Nevada's pooled 22.8%, and still not a reason to skip it, and ranks Clark County 11th of the 11 Nevada counties with 30 or more tests. Testing found those homes; the county's low share did not. How to test a home.

What ground is Las Vegas built on, as far as radon goes?

93.5% of Las Vegas sits on what USGS's map calls "Great Basin", rated moderate for radon potential, radon index 11; another 6.5% is "Great Basin", rated low for radon potential, radon index 8. So the ground changes within Las Vegas itself.

Is radon higher in the counties around Las Vegas?

Higher, in every direction measured: all 8 of the nearest counties with a figure report a larger share of high tests than Clark County's 8.1%, up to Carson City (40.6%, 317 miles off).

The answers use the published figures of Clark County, the county Las Vegas lies in.

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