Is radon high in Long Beach, California?

Low. Averaging the model's ZIP-code predictions across Long Beach (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.4 pCi/L - about 24% below 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. Long Beach ranks 171 of 207 California cities on this site.

Which Long Beach ZIP codes have the highest radon?

Predictions for the 11 modeled ZIP codes in Long Beach range from 1.3 to 1.4 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 Long Beach?

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

What does EPA Radon Zone 2 mean for Long Beach?

Long Beach sits mainly in Los Angeles 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 1.4 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 Long Beach, California

LowEPA Zone 2

Predicted long-term basement average of 1.4 pCi/L (model estimate) across the 11 modeled ZIP codes in Long Beach - about 24% below the US average of 1.8, close to the California average of 1.5. Ranked #171 of 207 California cities on this site. Most of the city lies in Los Angeles County.

Test Long Beach, CA once anyway - radon varies house to house

The predicted basement average here is 1.4 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.

1.4 ± 0.06

pCi/L predicted basement mean (model SD)

0.7 ± 0.09

pCi/L predicted upstairs (above-ground) mean

1.3-1.4

range of ZIP-level basement predictions in the city

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

What this means for Long Beach

The typical Long Beach home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.3 to 1.4 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 Los Angeles County as Zone 2 while the newer model predicts 1.4 pCi/L for Long Beach; where they disagree, we grade on the model but show both.

Comparable California cities: Oakland (1.4), Stockton (1.4), Huntington Park (1.4), Modesto (1.4).

ZIP codes in Long Beach

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
90805	14%	1.4 ± 0.07	0.6	Low
90815	14%	1.4 ± 0.07	0.7	Low
90808	13%	1.4 ± 0.07	0.7	Low
90802	13%	1.3 ± 0.07	0.7	Low
90806	10%	1.4 ± 0.06	0.7	Low
90807	9%	1.4 ± 0.06	0.7	Low
90803	8%	1.4 ± 0.06	0.7	Low
90810	6%	1.4 ± 0.06	0.7	Low
90813	6%	1.3 ± 0.07	0.6	Low
90804	4%	1.3 ± 0.07	0.7	Low
90814	3%	1.4 ± 0.06	0.7	Low
90822	<1%	—	—	no model
90840	<1%	—	—	no model
90831	<1%	—	—	no model

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.

Long Beach radon questions

Is radon high in Long Beach, California?: Low. Averaging the model's ZIP-code predictions across Long Beach (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.4 pCi/L - about 24% below 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. Long Beach ranks 171 of 207 California cities on this site.
Which Long Beach ZIP codes have the highest radon?: Predictions for the 11 modeled ZIP codes in Long Beach range from 1.3 to 1.4 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 Long Beach?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Long Beach's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 2 mean for Long Beach?: Long Beach sits mainly in Los Angeles 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 1.4 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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