Is radon high in Fall River, Massachusetts?

Low. Averaging the model's ZIP-code predictions across Fall River (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.8 pCi/L - close to the US average of 1.8 and close to the Massachusetts average of 1.8. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Fall River ranks 10 of 29 Massachusetts cities on this site.

Which Fall River ZIP codes have the highest radon?

Predictions for the 7 modeled ZIP codes in Fall River range from 1.2 to 2.5 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 43% at or above 2. That spread is why the ZIP table below matters more than the city-wide number.

Should I test for radon in Fall River?

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

What does EPA Radon Zone 2 mean for Fall River?

Fall River sits mainly in Bristol 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 1.8 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 Fall River, Massachusetts

LowEPA Zone 2

Predicted long-term basement average of 1.8 pCi/L (model estimate) across the 7 modeled ZIP codes in Fall River - close to the US average of 1.8, close to the Massachusetts average of 1.8. Ranked #10 of 29 Massachusetts cities on this site. Most of the city lies in Bristol County.

Test Fall River, MA once anyway - radon varies house to house

The predicted basement average here is 1.8 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.

1.8 ± 0.06

pCi/L predicted basement mean (model SD)

0.9 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.2-2.5

range of ZIP-level basement predictions in the city

of Fall River ZIPs predicted ≥ 4 pCi/L (43% ≥ 2)

What this means for Fall River

The typical Fall River home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.2 to 2.5 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 Bristol County as Zone 2 while the newer model predicts 1.8 pCi/L for Fall River; where they disagree, we grade on the model but show both.

Comparable Massachusetts cities: Lynn (1.8), Medford (1.8), Barnstable (1.8), Weymouth (1.9).

ZIP codes in Fall River

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
02720	40%	1.5 ± 0.07	0.9	Low
02790	14%	2.5 ± 0.06	1.2	Moderate
02717	14%	2.2 ± 0.05	1.2	Moderate
02721	12%	1.3 ± 0.07	0.7	Low
02747	10%	2.4 ± 0.08	1.1	Moderate
02724	5%	1.3 ± 0.06	0.7	Low
02723	5%	1.2 ± 0.06	0.6	Low

Testing help in Massachusetts

We link only state program pages we could verify, and Massachusetts's did not respond when we checked, so start from the 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.

Fall River radon questions

Is radon high in Fall River, Massachusetts?: Low. Averaging the model's ZIP-code predictions across Fall River (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.8 pCi/L - close to the US average of 1.8 and close to the Massachusetts average of 1.8. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Fall River ranks 10 of 29 Massachusetts cities on this site.
Which Fall River ZIP codes have the highest radon?: Predictions for the 7 modeled ZIP codes in Fall River range from 1.2 to 2.5 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 43% at or above 2. That spread is why the ZIP table below matters more than the city-wide number.
Should I test for radon in Fall River?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Fall River's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 2 mean for Fall River?: Fall River sits mainly in Bristol 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 1.8 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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