Is radon high in Sparks, Nevada?

Moderate. Averaging the model's ZIP-code predictions across Sparks (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.0 pCi/L - close to the US average of 1.8 and close to the Nevada average of 1.9. That is in the 2-4 pCi/L range where the EPA says to consider fixing. Sparks ranks 3 of 10 Nevada cities on this site.

Which Sparks ZIP codes have the highest radon?

Predictions for the 4 modeled ZIP codes in Sparks range from 1.9 to 2.3 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 50% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.

Should I test for radon in Sparks?

Yes, soon. With a predicted basement average of 2.0 pCi/L, a meaningful share of Sparks homes will test above the 4 pCi/L action level. Start with a short-term kit; if it reads 2 or higher, confirm with a long-term test or a continuous monitor before paying for mitigation.

What does EPA Radon Zone 2 mean for Sparks?

Sparks sits mainly in Washoe County, which the EPA classifies as Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and covers whole counties. The 2001-2021 model agrees with the zone for the city. Neither replaces a test of your own home.

Radon levels in Sparks, Nevada

ModerateEPA Zone 2

Predicted long-term basement average of 2.0 pCi/L (model estimate) across the 4 modeled ZIP codes in Sparks - close to the US average of 1.8, close to the Nevada average of 1.9. Ranked #3 of 10 Nevada cities on this site. Most of the city lies in Washoe County (its ZIPs also reach into 1 other county).

Test Sparks, NV - the EPA says "consider fixing" in this range

The predicted basement average here is 2.0 pCi/L, in the 2-4 pCi/L band where the EPA recommends considering mitigation. Plenty of individual homes in a moderate area test above 4. Start with a short-term test; if it comes back at 2 or higher, follow up with a long-term test or a continuous monitor.

Get a short-term test kit →Or track it with a continuous monitor

Already tested at 4 pCi/L or higher? Find a certified mitigation professional (EPA). A mitigation system typically runs $800-$2,500 installed.

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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

2.0 ± 0.05

pCi/L predicted basement mean (model SD)

1.4 ± 0.06

pCi/L predicted upstairs (above-ground) mean

1.9-2.3

range of ZIP-level basement predictions in the city

of Sparks ZIPs predicted ≥ 4 pCi/L (50% ≥ 2)

What this means for Sparks

The typical Sparks home is predicted in the 2-4 pCi/L band. The EPA's guidance for this range is to consider fixing, because there is no known safe level and a meaningful minority of homes in a moderate area will test above 4.

The city figure is not a separate estimate: it is the mean of the model's ZIP-code predictions, weighted by the share of the city's land in each ZIP (Census 2020 ZCTA-to-place relationship file). The 1993 EPA zone (2) for Washoe and the 2001-2021 model agree here.

Comparable Nevada cities: Reno (2.2), Las Vegas (1.8), North Las Vegas (1.8), Sunrise Manor (1.8).

ZIP codes in Sparks

ZIPs that overlap the city, largest share of its land first. Predicted basement and upstairs means are model estimates; ZIPs the model does not cover show a dash.

ZIP	Share of city	Basement	Upstairs	Grade
89436	53%	1.9 ± 0.05	1.4	Low
89431	24%	2.3 ± 0.05	1.6	Moderate
89434	22%	1.9 ± 0.05	1.1	Low
89502	1%	2.2 ± 0.06	1.4	Moderate

Testing help in Nevada

Nevada's radon program page is at extension.unr.edu and, when we checked it, offered low-cost radon test kits. EPA state radon contacts page. If a test comes back at 4 pCi/L or higher, mitigation typically costs $800-$2,500 installed; use EPA find-a-professional and read the mitigation guide.

Sparks radon questions

Is radon high in Sparks, Nevada?: Moderate. Averaging the model's ZIP-code predictions across Sparks (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.0 pCi/L - close to the US average of 1.8 and close to the Nevada average of 1.9. That is in the 2-4 pCi/L range where the EPA says to consider fixing. Sparks ranks 3 of 10 Nevada cities on this site.
Which Sparks ZIP codes have the highest radon?: Predictions for the 4 modeled ZIP codes in Sparks range from 1.9 to 2.3 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 50% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.
Should I test for radon in Sparks?: Yes, soon. With a predicted basement average of 2.0 pCi/L, a meaningful share of Sparks homes will test above the 4 pCi/L action level. Start with a short-term kit; if it reads 2 or higher, confirm with a long-term test or a continuous monitor before paying for mitigation.
What does EPA Radon Zone 2 mean for Sparks?: Sparks sits mainly in Washoe County, which the EPA classifies as Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and covers whole counties. The 2001-2021 model agrees with the zone for the city. Neither replaces a test of your own home.

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