Is radon high in St. Petersburg, Florida?

Low. Averaging the model's ZIP-code predictions across St. Petersburg (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.2 pCi/L - about 35% below the US average of 1.8 and close to the Florida average of 1.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. St. Petersburg ranks 68 of 89 Florida cities on this site.

Which St. Petersburg ZIP codes have the highest radon?

Predictions for the 14 modeled ZIP codes in St. Petersburg range from 0.9 to 1.4 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 St. Petersburg?

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

What does EPA Radon Zone 3 mean for St. Petersburg?

St. Petersburg sits mainly in Pinellas 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 St. Petersburg, Florida

LowEPA Zone 3

Predicted long-term basement average of 1.2 pCi/L (model estimate) across the 14 modeled ZIP codes in St. Petersburg - about 35% below the US average of 1.8, close to the Florida average of 1.3. Ranked #68 of 89 Florida cities on this site. Most of the city lies in Pinellas County.

Test St. Petersburg, FL once anyway - radon varies house to house

The predicted basement average here is 1.2 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.

Get a short-term test kit →Or track it with a continuous monitor

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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.

1.2 ± 0.08

pCi/L predicted basement mean (model SD)

0.9 ± 0.08

pCi/L predicted upstairs (above-ground) mean

0.9-1.4

range of ZIP-level basement predictions in the city

of St. Petersburg ZIPs predicted ≥ 4 pCi/L (0% ≥ 2)

What this means for St. Petersburg

The typical St. Petersburg home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 0.9 to 1.4 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 Pinellas and the 2001-2021 model agree here.

Comparable Florida cities: Fort Lauderdale (1.2), Oakland Park (1.2), Tampa (1.2), Kissimmee (1.2).

ZIP codes in St. Petersburg

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
33702	13%	1.3 ± 0.07	1.1	Low
33710	13%	1.3 ± 0.06	0.9	Low
33713	11%	1.2 ± 0.07	0.9	Low
33712	11%	1.0 ± 0.09	0.7	Low
33716	10%	1.1 ± 0.10	1.0	Low
33705	9%	1.0 ± 0.09	0.7	Low
33703	8%	1.3 ± 0.07	1.1	Low
33711	7%	1.1 ± 0.07	0.7	Low
33704	6%	1.1 ± 0.07	1.0	Low
33701	4%	0.9 ± 0.09	0.7	Low
33707	3%	1.1 ± 0.08	0.7	Low
33762	2%	1.3 ± 0.07	1.3	Low
33714	2%	1.1 ± 0.09	0.9	Low
33715	2%	1.3 ± 0.06	1.0	Low

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.

St. Petersburg radon questions

Is radon high in St. Petersburg, Florida?: Low. Averaging the model's ZIP-code predictions across St. Petersburg (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.2 pCi/L - about 35% below the US average of 1.8 and close to the Florida average of 1.3. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. St. Petersburg ranks 68 of 89 Florida cities on this site.
Which St. Petersburg ZIP codes have the highest radon?: Predictions for the 14 modeled ZIP codes in St. Petersburg range from 0.9 to 1.4 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 St. Petersburg?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; St. Petersburg's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 3 mean for St. Petersburg?: St. Petersburg sits mainly in Pinellas 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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