Is radon high in Cleveland, Ohio?

Low. Averaging the model's ZIP-code predictions across Cleveland (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.3 pCi/L - about 27% below the US average of 1.8 and about 53% below the Ohio average of 2.8. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Cleveland ranks 24 of 27 Ohio cities on this site.

Which Cleveland ZIP codes have the highest radon?

Predictions for the 19 modeled ZIP codes in Cleveland range from 1.1 to 1.8 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 Cleveland?

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

What does EPA Radon Zone 2 mean for Cleveland?

Cleveland sits mainly in Cuyahoga 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 1.3 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 Cleveland, Ohio

LowEPA Zone 2

Predicted long-term basement average of 1.3 pCi/L (model estimate) across the 19 modeled ZIP codes in Cleveland - about 27% below the US average of 1.8, about 53% below the Ohio average of 2.8. Ranked #24 of 27 Ohio cities on this site. Most of the city lies in Cuyahoga County.

Test Cleveland, OH once anyway - radon varies house to house

The predicted basement average here is 1.3 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.

1.3 ± 0.07

pCi/L predicted basement mean (model SD)

0.8 ± 0.08

pCi/L predicted upstairs (above-ground) mean

1.1-1.8

range of ZIP-level basement predictions in the city

of Cleveland ZIPs predicted ≥ 4 pCi/L (0% ≥ 2)

What this means for Cleveland

The typical Cleveland home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.1 to 1.8 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 Cuyahoga County as Zone 2 while the newer model predicts 1.3 pCi/L for Cleveland; where they disagree, we grade on the model but show both.

Comparable Ohio cities: Euclid (1.3), Lakewood (1.2), Toledo (1.1), Cleveland Heights (1.5).

ZIP codes in Cleveland

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
44135	12%	1.4 ± 0.07	0.8	Low
44109	9%	1.2 ± 0.07	0.7	Low
44105	9%	1.6 ± 0.07	0.9	Low
44111	9%	1.2 ± 0.08	0.8	Low
44102	8%	1.2 ± 0.12	0.7	Low
44104	6%	1.3 ± 0.06	0.7	Low
44103	5%	1.3 ± 0.06	0.7	Low
44110	5%	1.2 ± 0.06	0.7	Low
44113	5%	1.2 ± 0.06	0.8	Low
44108	5%	1.2 ± 0.07	0.7	Low
44128	4%	1.8 ± 0.07	0.9	Low
44106	4%	1.3 ± 0.06	0.7	Low
44114	4%	1.2 ± 0.07	0.7	Low
44120	3%	1.5 ± 0.06	0.8	Low
44115	3%	1.1 ± 0.07	0.7	Low
44127	2%	1.3 ± 0.07	0.7	Low
44144	2%	1.4 ± 0.06	0.9	Low
44119	2%	1.2 ± 0.07	0.8	Low
44112	1%	1.3 ± 0.06	0.7	Low
44101	<1%	—	—	no model

Testing help in Ohio

Ohio's radon program page is at odh.ohio.gov; it lists testing and certified-mitigator guidance. 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.

Cleveland radon questions

Is radon high in Cleveland, Ohio?: Low. Averaging the model's ZIP-code predictions across Cleveland (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.3 pCi/L - about 27% below the US average of 1.8 and about 53% below the Ohio average of 2.8. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Cleveland ranks 24 of 27 Ohio cities on this site.
Which Cleveland ZIP codes have the highest radon?: Predictions for the 19 modeled ZIP codes in Cleveland range from 1.1 to 1.8 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 Cleveland?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Cleveland's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 2 mean for Cleveland?: Cleveland sits mainly in Cuyahoga 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 1.3 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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