Is radon high in San Angelo, Texas?

Low. Averaging the model's ZIP-code predictions across San Angelo (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 about 1.2× the Texas average of 1.5. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. San Angelo ranks 14 of 83 Texas cities on this site.

Which San Angelo ZIP codes have the highest radon?

Predictions for the 4 modeled ZIP codes in San Angelo range from 1.4 to 2.0 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 25% 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 San Angelo?

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

What does EPA Radon Zone 3 mean for San Angelo?

San Angelo sits mainly in Tom Green County, which the EPA classifies as Zone 3 - low potential (< 2 pCi/L). The zone map dates from 1993 and covers whole counties. The 2001-2021 model agrees with the zone for the city. Neither replaces a test of your own home.

Radon levels in San Angelo, Texas

LowEPA Zone 3

Predicted long-term basement average of 1.8 pCi/L (model estimate) across the 4 modeled ZIP codes in San Angelo - close to the US average of 1.8, about 1.2× the Texas average of 1.5. Ranked #14 of 83 Texas cities on this site. Most of the city lies in Tom Green County.

Test San Angelo, TX 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 ± 0.07

pCi/L predicted basement mean (model SD)

0.7 ± 0.08

pCi/L predicted upstairs (above-ground) mean

1.4-2.0

range of ZIP-level basement predictions in the city

of San Angelo ZIPs predicted ≥ 4 pCi/L (25% ≥ 2)

What this means for San Angelo

The typical San Angelo home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.4 to 2.0 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). The 1993 EPA zone (3) for Tom Green and the 2001-2021 model agree here.

Comparable Texas cities: McKinney (1.8), Midland (1.8), Little Elm (1.7), Grand Prairie (1.7).

ZIP codes in San Angelo

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
76904	35%	1.9 ± 0.06	0.8	Low
76903	33%	1.4 ± 0.07	0.6	Low
76905	16%	2.0 ± 0.07	0.8	Moderate
76901	13%	1.9 ± 0.07	0.8	Low
76908	3%	—	—	no model
76909	<1%	—	—	no model

Testing help in Texas

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

San Angelo radon questions

Is radon high in San Angelo, Texas?: Low. Averaging the model's ZIP-code predictions across San Angelo (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 about 1.2× the Texas average of 1.5. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. San Angelo ranks 14 of 83 Texas cities on this site.
Which San Angelo ZIP codes have the highest radon?: Predictions for the 4 modeled ZIP codes in San Angelo range from 1.4 to 2.0 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 25% 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 San Angelo?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; San Angelo's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 3 mean for San Angelo?: San Angelo sits mainly in Tom Green County, which the EPA classifies as Zone 3 - low potential (< 2 pCi/L). The zone map dates from 1993 and covers whole counties. The 2001-2021 model agrees with the zone for the city. Neither replaces a test of your own home.

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