Radon levels in Miami, Florida
LowEPA Zone 2Predicted long-term basement average of 1.0 pCi/L (model estimate) across the 18 modeled ZIP codes in Miami - about 43% below the US average of 1.8, about 17% below the Florida average of 1.3. Ranked #84 of 89 Florida cities on this site. Most of the city lies in Miami-Dade County.
Test Miami, FL once anyway - radon varies house to house
The predicted basement average here is 1.0 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.
1.0 ± 0.07
pCi/L predicted basement mean (model SD)
1.1 ± 0.15
pCi/L predicted upstairs (above-ground) mean
1.0-1.1
range of ZIP-level basement predictions in the city
0%
of Miami ZIPs predicted ≥ 4 pCi/L (0% ≥ 2)
What this means for Miami
The typical Miami home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.0 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 Miami-Dade County as Zone 2 while the newer model predicts 1.0 pCi/L for Miami; where they disagree, we grade on the model but show both.
Comparable Florida cities: Delray Beach (1.0), Fountainebleau (1.0), North Miami (1.0), Clearwater (1.1).
ZIP codes in Miami
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 |
|---|---|---|---|---|
| 33125 | 11% | 1.0 ± 0.07 | 1.0 | Low |
| 33133 | 11% | 1.1 ± 0.07 | 1.1 | Low |
| 33127 | 9% | 1.1 ± 0.07 | 1.1 | Low |
| 33142 | 8% | 1.0 ± 0.08 | 1.1 | Low |
| 33145 | 7% | 1.0 ± 0.08 | 1.0 | Low |
| 33126 | 6% | 1.0 ± 0.08 | 1.0 | Low |
| 33135 | 6% | 1.0 ± 0.08 | 1.1 | Low |
| 33137 | 6% | 1.0 ± 0.07 | 1.0 | Low |
| 33138 | 5% | 1.0 ± 0.07 | 0.9 | Low |
| 33132 | 4% | 1.0 ± 0.07 | 1.0 | Low |
| 33136 | 4% | 1.0 ± 0.08 | 0.9 | Low |
| 33129 | 4% | 1.1 ± 0.07 | 1.0 | Low |
| 33149 | 4% | 1.1 ± 0.07 | 1.1 | Low |
| 33150 | 3% | 1.0 ± 0.07 | 1.1 | Low |
| 33130 | 3% | 1.0 ± 0.09 | 1.0 | Low |
| 33134 | 3% | 1.1 ± 0.07 | 1.3 | Low |
| 33144 | 3% | 1.1 ± 0.07 | 1.1 | Low |
| 33131 | 1% | 1.0 ± 0.07 | 1.1 | Low |
| 33128 | 1% | — | — | no model |
| 33101 | <1% | — | — | no model |
Testing help in Florida
Florida's radon program page is at www.floridahealth.gov and, when we checked it, offered a free radon test kit on request. 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.
Miami radon questions
- Is radon high in Miami, Florida?
- Low. Averaging the model's ZIP-code predictions across Miami (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.0 pCi/L - about 43% below the US average of 1.8 and about 17% below the Florida average of 1.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Miami ranks 84 of 89 Florida cities on this site.
- Which Miami ZIP codes have the highest radon?
- Predictions for the 18 modeled ZIP codes in Miami range from 1.0 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 Miami?
- Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Miami's low predicted average describes the typical home, not yours.
- What does EPA Radon Zone 2 mean for Miami?
- Miami sits mainly in Miami-Dade 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 1.0 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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