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Radon Levels in Carson City, Nevada

EPA puts Carson City in Zone 1, its highest radon zone, and high results are common there: 40.6% of the 731 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

    40.6%

    17.8 pts above NV

    Carson City
    40.6%
    Nevada
    22.8%

    731 tests, 2008 to 2017

  • Median result

    3.3pCi/L

    Below action level

    Carson City
    3.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    731

    4th of 11 by tests

    Carson City
    731
    Washoe
    5,046

    Reported to CDC before any fix, 2008 to 2017

  • 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

  • Rank in Nevada

    1 of 11

    Top quarter

    Carson City
    40.6%
    Carson City
    40.6%

    By share, of 11 with 30+ tests

Read a result for Carson City

Starts at Carson City's median, 3.3 pCi/L

3.3pCi/L

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

EPA’s reading of 3.3 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. Carson City's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Carson City, At a glance

Carson City at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Carson City 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: Moderate across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Carson City, 2008 to 2017, laboratory

Reported results by concentration band, Carson City, 2008 to 2017, laboratory
Under 2 pCi/L: 28%2 to 4 pCi/L: 31%4 pCi/L and above: 41%

Of 731 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Carson City, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L20427.9%
2 to 4 pCi/L23031.5%
4 pCi/L and above29740.6%
What these figures count

These are the 731 tests reported to CDC for Carson City over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not 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

Carson City, Compared

Carson City radon figures, compared

Calculated by Radon411

In Carson City, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (297 of 731) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.9 points higher. Across 16 Nevada counties pooled together, 22.8% of tests reached that level, so Carson City runs 17.8 points above its state.

Of 5 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 7.4% (Placer County, CA) to 37.0% (Douglas County). By share, Carson City is 1st of 11 Nevada counties with 30 or more tests for the same period.

Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 100.5 pCi/L. Below the action level, 204 tests (27.9%) came in under 2 pCi/L, against 52.5% statewide, and 230 tests (31.5%) fell between 2 and 4, against 24.8% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 40.6% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

CDC's ten-year totals for Carson City went from 665 tests (2005 to 2014) to 731 (2008 to 2017), the share going from 40.8% to 40.6%.

Carson City against Nevada, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Carson City
Carson City73140.6%3.3 pCi/LThis county
Nevada, pooled16 counties, pooled10,93022.8%Not pooled−17.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−4.9 points
Elko Countyhighest in the state15940.3%3.1 pCi/L−0.3 points
Clark Countylowest in the state2,5988.1%0.9 pCi/L−32.5 points
Douglas County, NVborders it1,61737.0%3.1 pCi/L−3.6 points
Lyon County, NVborders it30330.4%2.6 pCi/L−10.2 points
Washoe County, NVborders it5,04622.2%1.9 pCi/L−18.4 points
Storey County, NVborders it3417.6%2.3 pCi/L−23.0 points
Placer County, CAborders it2837.4%1.1 pCi/L−33.2 points
Where Carson City's reported results fell, 2008 to 2017, laboratory, beside Nevada and the United States
ResultCarson City testsCarson City shareNevada shareU.S. shareAgainst Nevada
Under 2 pCi/L20427.9%52.5%39.6%−24.6 points
2 to 4 pCi/L23031.5%24.8%24.7%+6.7 points
4 pCi/L and above29740.6%22.8%35.7%+17.8 points
Carson City ranked among the 11 Nevada counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Carson City1 of 1173140.6%3.3 pCi/L
Elko County2 of 1115940.3%3.1 pCi/L
White Pine County3 of 116939.1%3.1 pCi/L
Douglas County4 of 111,61737.0%3.1 pCi/L
Humboldt County5 of 116532.3%2.3 pCi/L
Lyon County6 of 1130330.4%2.6 pCi/L
Washoe County7 of 115,04622.2%1.9 pCi/L
Storey County8 of 113417.6%2.3 pCi/L
Churchill County9 of 1116112.4%2.1 pCi/L
Nye County10 of 118111.1%1.3 pCi/L
Clark County11 of 112,5988.1%0.9 pCi/L
Carson City ten-year laboratory totals, against Nevada's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestNevada, pooledChange from the row before
2008 to 201773140.6%3.3 pCi/L100.5 pCi/L22.8%−0.2 points
2007 to 201671840.8%3.3 pCi/L100.5 pCi/L22.9%−0.2 points
2006 to 201569841.0%3.3 pCi/L100.5 pCi/L23.7%+0.2 points
2005 to 201466540.8%3.3 pCi/L100.5 pCi/L23.3%First on file

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

Carson City, State data

Nevada's own radon test data

Measured

What Nevada's own agencies publish about radon tests in Carson City, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What the Nevada Radon Education Program reports for the ZIP codes in Carson City

The Nevada Radon Education Program publishes its figures by ZIP code, not by county. These are the 4 ZIP codes that lie wholly or partly in Carson City, each with the state's own figures for it. Period: 1989-2015.

ZIP codes in Carson City
ZIP codeWhat the state reports
89701average 3.7 pCi/L
89703average 6.1 pCi/L
89705average 2.9 pCi/L
89706average 3.1 pCi/L
  • NBMG says the results are based on independently tested homes, not scientific sampling.
  • The service publishes an average for each ZIP code but no count of tests.
  • Site specific testing is the only way to determine local radon concentrations.
  • A ZIP code that crosses the county line is listed whole; its figures cover all of it.

Measured: Nevada Radon Education Program data, 1989-2015.

Carson City, Geology

The ground under Carson City

Predicted

USGS's geologic map puts all of Carson City's mapped land in one class: moderate radon potential. The map puts 89.1% of Carson City in the area it calls Sierra Nevada and 10.9% in Great Basin. USGS gives the first a radon index of 9 and the second 11, both in the moderate band (9 to 11).

USGS's geologic areas under Carson City
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Sierra NevadaNorthern Sierra Nevada is underlain primarily by Paleozoic and Mesozoic metamorphic rocks. Granitic rocks predominate in the southern Sierrra Nevada , with lesser Mesozoic metamorphic rocks.Moderate989.1%
Great BasinSandstone, shale, limestone, mafic volcanic rocks.Moderate1110.9%

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

Carson City beside the ground around it

Across Nevada 17.3% of the land is rated high; none of Carson City's is. Of the 5 counties that border it, 1 has more high-potential ground, Lyon County the most at 13.5%.

Share of land by USGS radon potential: Carson City, the 5 counties bordering it and Nevada
AreaEPA zoneLow potentialModerate potentialHigh potential
Carson CityZone 1None100%None
Storey CountyZone 2None100%None
Douglas CountyZone 1None100%None
Lyon CountyZone 1None86.5%13.5%
Placer County, CAZone 27.7%92.3%None
Washoe CountyZone 242.1%57.9%None
Nevada17 counties, pooled by land areaVaries7.9%74.8%17.3%

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

Local help

Carson City, Local resources

Radon testing and mitigation in Carson City

What Nevada's program says
Email
chrisk@unr.edu

What it means

Carson City, Questions

Questions about radon in Carson City

Are radon levels high in Carson City?

Over the 2008 to 2017 laboratory totals, 40.6% of the radon tests reported to CDC for Carson City, Nevada were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 11 Nevada counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 22.8%.

Which counties border Carson City?

Carson City borders 5 counties: Storey County, NV, Douglas County, NV, Lyon County, NV, Placer County, CA and Washoe County, NV.

Products

Carson City, Products

Testing a home in Carson City

In Carson City, 40.6% of 731 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.8% pooled across Nevada. In Zone 1 the year-round level in Carson City 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

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

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Carson City, Bordering counties

Counties bordering Carson City

Calculated by Radon411

Carson City, Cities and towns

Cities and towns in Carson City

Carson City's population has barely moved since 2020: 58,571 residents on July 1, 2025 against 58,688 then, by the Census Bureau's estimates. That works out to 405 people per square mile of land. Carson City, its one incorporated place, has 58,571 residents, 100.0% of the total. Testing is reported here more often than across the state: CDC's 731 reported tests for 2008 to 2017 come to 12.5 for every 1,000 residents (2025 estimate), against 3.3 for Nevada.

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

Carson City, Carson City: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Carson City58,571−0.2%100.0%

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).

Carson City, Homes

Homes in Carson City

Of Carson City's 24,902 homes, 60% are detached houses, against 60% across Nevada; 20% are in buildings of five or more homes. The homes are older than Nevada's as a whole: half were built before 1980 (1996 for Nevada), and 8% date from before 1960. 63% of occupied homes are lived in by their owner (Nevada: 59%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Carson City, Nevada, 2019 to 2023
HomesCarson CityNevada
Housing units24,9021,307,338
Detached houses60%60%
In buildings of 5 or more20%22%
Mobile homes9%6%
Built before 19608%5%
Built since 200016%40%
Middle year built19801996
Owner-occupied63%59%

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