Is radon high in Jersey City, New Jersey?

Low. Averaging the model's ZIP-code predictions across Jersey City (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 0.9 pCi/L - about 48% below the US average of 1.8 and about 28% below the New Jersey average of 1.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Jersey City ranks 21 of 22 New Jersey cities on this site.

Which Jersey City ZIP codes have the highest radon?

Predictions for the 6 modeled ZIP codes in Jersey City range from 0.8 to 1.1 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 Jersey City?

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

What does EPA Radon Zone 2 mean for Jersey City?

Jersey City sits mainly in Hudson 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 0.9 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 Jersey City, New Jersey

LowEPA Zone 2

Predicted long-term basement average of 0.9 pCi/L (model estimate) across the 6 modeled ZIP codes in Jersey City - about 48% below the US average of 1.8, about 28% below the New Jersey average of 1.3. Ranked #21 of 22 New Jersey cities on this site. Most of the city lies in Hudson County.

Test Jersey City, NJ once anyway - radon varies house to house

The predicted basement average here is 0.9 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.

0.9 ± 0.07

pCi/L predicted basement mean (model SD)

0.5 ± 0.07

pCi/L predicted upstairs (above-ground) mean

0.8-1.1

range of ZIP-level basement predictions in the city

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

What this means for Jersey City

The typical Jersey City home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 0.8 to 1.1 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 Hudson County as Zone 2 while the newer model predicts 0.9 pCi/L for Jersey City; where they disagree, we grade on the model but show both.

Comparable New Jersey cities: Hoboken (1.0), Paterson (1.0), Elizabeth (1.0), Passaic (1.0).

ZIP codes in Jersey City

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
07305	39%	0.8 ± 0.07	0.5	Low
07306	20%	1.0 ± 0.06	0.5	Low
07304	14%	1.1 ± 0.06	0.5	Low
07307	13%	1.1 ± 0.06	0.5	Low
07302	10%	0.9 ± 0.07	0.5	Low
07310	4%	1.0 ± 0.07	0.5	Low
07311	<1%	—	—	no model

Testing help in New Jersey

New Jersey's radon program page is at www.nj.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.

Jersey City radon questions

Is radon high in Jersey City, New Jersey?: Low. Averaging the model's ZIP-code predictions across Jersey City (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 0.9 pCi/L - about 48% below the US average of 1.8 and about 28% below the New Jersey average of 1.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Jersey City ranks 21 of 22 New Jersey cities on this site.
Which Jersey City ZIP codes have the highest radon?: Predictions for the 6 modeled ZIP codes in Jersey City range from 0.8 to 1.1 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 Jersey City?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Jersey City's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 2 mean for Jersey City?: Jersey City sits mainly in Hudson 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 0.9 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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