Is radon high in Westfield, Indiana?

Low. Averaging the model's ZIP-code predictions across Westfield (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.6 pCi/L - close to the US average of 1.8 and about 30% below the Indiana average of 2.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Westfield ranks 21 of 23 Indiana cities on this site.

Which Westfield ZIP codes have the highest radon?

Predictions for the 6 modeled ZIP codes in Westfield range from 1.5 to 3.0 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 17% 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 Westfield?

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

What does EPA Radon Zone 1 mean for Westfield?

Westfield sits mainly in Hamilton County, which the EPA classifies as Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 1.6 pCi/L does not line up with Zone 1, 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 Westfield, Indiana

LowEPA Zone 1

Predicted long-term basement average of 1.6 pCi/L (model estimate) across the 6 modeled ZIP codes in Westfield - close to the US average of 1.8, about 30% below the Indiana average of 2.3. Ranked #21 of 23 Indiana cities on this site. Most of the city lies in Hamilton County (its ZIPs also reach into 1 other county).

Test Westfield, IN once anyway - radon varies house to house

The predicted basement average here is 1.6 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.

1.6 ± 0.09

pCi/L predicted basement mean (model SD)

1.3 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.5-3.0

range of ZIP-level basement predictions in the city

of Westfield ZIPs predicted ≥ 4 pCi/L (17% ≥ 2)

What this means for Westfield

The typical Westfield home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.5 to 3.0 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 Hamilton County as Zone 1 while the newer model predicts 1.6 pCi/L for Westfield; where they disagree, we grade on the model but show both.

Comparable Indiana cities: Fishers (1.6), Evansville (1.7), Carmel (1.8), South Bend (1.8).

ZIP codes in Westfield

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
46074	76%	1.5 ± 0.10	1.3	Low
46033	9%	1.8 ± 0.09	1.3	Low
46062	7%	1.7 ± 0.09	1.3	Low
46032	4%	1.8 ± 0.08	1.4	Low
46069	2%	3.0 ± 0.06	1.6	Moderate
46077	1%	1.8 ± 0.08	1.3	Low

Testing help in Indiana

We link only state program pages we could verify, and Indiana'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.

Westfield radon questions

Is radon high in Westfield, Indiana?: Low. Averaging the model's ZIP-code predictions across Westfield (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.6 pCi/L - close to the US average of 1.8 and about 30% below the Indiana average of 2.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Westfield ranks 21 of 23 Indiana cities on this site.
Which Westfield ZIP codes have the highest radon?: Predictions for the 6 modeled ZIP codes in Westfield range from 1.5 to 3.0 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 17% 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 Westfield?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Westfield's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 1 mean for Westfield?: Westfield sits mainly in Hamilton County, which the EPA classifies as Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 1.6 pCi/L does not line up with Zone 1, 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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