Is radon high in Eastvale, California?

Low. Averaging the model's ZIP-code predictions across Eastvale (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.7 pCi/L - close to the US average of 1.8 and close to the California average of 1.5. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Eastvale ranks 30 of 207 California cities on this site.

Which Eastvale ZIP codes have the highest radon?

Predictions for the 2 modeled ZIP codes in Eastvale range from 1.6 to 1.7 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 0% 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 Eastvale?

Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Eastvale's low predicted average describes the typical home, not yours.

What does EPA Radon Zone 2 mean for Eastvale?

Eastvale sits mainly in Riverside 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 newer model's city average of 1.7 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

Radon levels in Eastvale, California

LowEPA Zone 2

Predicted long-term basement average of 1.7 pCi/L (model estimate) across the 2 modeled ZIP codes in Eastvale - close to the US average of 1.8, close to the California average of 1.5. Ranked #30 of 207 California cities on this site. Most of the city lies in Riverside County.

Test Eastvale, CA once anyway - radon varies house to house

The predicted basement average here is 1.7 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

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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.

1.7 ± 0.06

pCi/L predicted basement mean (model SD)

0.9 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.6-1.7

range of ZIP-level basement predictions in the city

of Eastvale ZIPs predicted ≥ 4 pCi/L (0% ≥ 2)

What this means for Eastvale

The typical Eastvale home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.6 to 1.7 pCi/L.

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). Note that the EPA classifies Riverside County as Zone 2 while the newer model predicts 1.7 pCi/L for Eastvale; where they disagree, we grade on the model but show both.

Comparable California cities: Chino (1.7), Yorba Linda (1.7), Diamond Bar (1.7), Hemet (1.7).

ZIP codes in Eastvale

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
92880	79%	1.7 ± 0.06	0.9	Low
91752	21%	1.6 ± 0.06	0.9	Low

Testing help in California

California's radon program page is at www.cdph.ca.gov; it lists testing and certified-mitigator guidance. 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.

Eastvale radon questions

Is radon high in Eastvale, California?: Low. Averaging the model's ZIP-code predictions across Eastvale (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.7 pCi/L - close to the US average of 1.8 and close to the California average of 1.5. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Eastvale ranks 30 of 207 California cities on this site.
Which Eastvale ZIP codes have the highest radon?: Predictions for the 2 modeled ZIP codes in Eastvale range from 1.6 to 1.7 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 0% 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 Eastvale?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Eastvale's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 2 mean for Eastvale?: Eastvale sits mainly in Riverside 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 newer model's city average of 1.7 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

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