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RD1 short-term charcoal radon test kit
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Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Cuyahoga County, Ohio
EPA puts Cuyahoga County in Zone 2, its middle radon zone, and 21.7% of its 10,092 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
21.7%
30.6 pts below OH
- Cuyahoga
- 21.7%
- Ohio
- 52.3%
10,092 tests, 2008 to 2017
Median result
2.0pCi/L
Below action level
- Cuyahoga
- 2.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
10,092
2nd of 79 by tests
- Cuyahoga
- 10,092
- Franklin
- 16,142
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Ohio
79 of 79
Lowest quarter
- Cuyahoga
- 21.7%
- Pickaway
- 81.4%
By share, of 79 with 30+ tests
Read a result for Cuyahoga County
Starts at Cuyahoga County's median, 2.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.0 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Cuyahoga County's median reported result, 2008 to 2017.
The data
Cuyahoga County, At a glance
Cuyahoga County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Cuyahoga County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Cuyahoga County, 2008 to 2017, laboratory
Under 2 pCi/L: 48%2 to 4 pCi/L: 30%4 pCi/L and above: 22%
Of 10,092 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 4,817 | 47.7% |
| 2 to 4 pCi/L | 3,086 | 30.6% |
| 4 pCi/L and above | 2,189 | 21.7% |
What these figures count
These are the 10,092 tests reported to CDC for Cuyahoga County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Cuyahoga County, Compared
Cuyahoga County radon figures, compared
Calculated by Radon411Cuyahoga County's 10,092 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.0 pCi/L and a maximum of 56.4 pCi/L, and 21.7% reached 4 pCi/L. Ohio as a whole (88 Ohio counties, pooled) comes to 52.3%: 30.6 points higher than here.
Among its state's counties it ranks 79th of 79 Ohio counties with 30 or more tests for the same period. Statewide for the same period, Pickaway County reported the highest share (81.4%) and Geauga County the lowest (23.4%).
Below the action level, 4,817 tests (47.7%) came in under 2 pCi/L, against 23.1% statewide, and 3,086 tests (30.6%) fell between 2 and 4, against 24.6% statewide. CDC's ten-year totals for Cuyahoga County went from 6,240 tests (2005 to 2014) to 10,092 (2008 to 2017), the share going from 22.9% to 21.7%.
EPA's 1993 zone map puts Cuyahoga County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 23.4% in Geauga County to 45.4% in Lorain County.
CDC also counts 439 tests taken after mitigation in Cuyahoga County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cuyahoga County, Geology
The ground under Cuyahoga County
PredictedUSGS's geologic map puts all of Cuyahoga County's mapped land in one class: moderate radon potential. The map puts 64.6% of Cuyahoga County in the area it calls Glaciated Plateau and 35.3% in Lake Plains. USGS gives the first a radon index of 11 and the second 10, both in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glaciated Plateau | Devonian, Mississippian and Permian carbonates and shales. | Moderate | 11 | 64.6% |
| Lake Plains | Glacial lake deposits, Devonian shale and limestone. | Moderate | 10 | 35.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cuyahoga County beside the ground around it
Across Ohio 62.8% of the land is rated high; none of Cuyahoga County's is. Of the 6 counties that border it, 5 have more moderate-potential ground, Geauga County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Cuyahoga County, Local resources
Radon testing and mitigation in Cuyahoga County
Listed radon businesses with an address in Cuyahoga County:
- Radon Education and Licensing ProgramRadon Education and Licensing Program, run by Ohio Department of Health, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Ohio.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Free radon test kits are available for Ohio homeowners.
- Compare kits
- Professionals in Ohio479 professionals are listed in Ohio.
Listed radon professionals by town: Cleveland, Parma, Lakewood, Euclid, Strongsville, Cleveland Heights, Westlake, North Royalton, Garfield Heights, Solon, Rocky River, Parma Heights, Mayfield Heights, Berea, Brecksville, University Heights, Bedford, Seven Hills, Highland Heights, Chagrin Falls, Walton Hills
What Ohio's program says
- Phone
- 614-728-0272
- indoor.radon@odh.ohio.gov
- Licensing of radon professionals
This program licenses companies and persons directly involved with the radon testing and mitigation industry.
What it means
Cuyahoga County, Questions
Questions about radon in Cuyahoga County
Are radon levels high in Cuyahoga County?
Over the 2008 to 2017 laboratory totals, 21.7% of the radon tests reported to CDC for Cuyahoga County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 78 reported a higher share; pooled, the state comes to 52.3%.
Which counties border Cuyahoga County?
Cuyahoga County borders 6 counties: Summit County, Lorain County, Medina County, Geauga County, Portage County and Lake County.
Products
Cuyahoga County, Products
Testing a home in Cuyahoga County
In Cuyahoga County, 21.7% of 10,092 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Cuyahoga County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Cuyahoga County, Bordering counties
Counties bordering Cuyahoga County
Calculated by Radon411- Radon levels in Lorain CountyEPA zone 2
45.4%at or above 4 pCi/L
Median 3.6 pCi/L · 3,307 tests · 23.7 points above Cuyahoga County
- Radon levels in Medina CountyEPA zone 2
43.4%at or above 4 pCi/L
Median 3.5 pCi/L · 2,139 tests · 21.7 points above Cuyahoga County
- Radon levels in Portage CountyEPA zone 2
39.3%at or above 4 pCi/L
Median 3.2 pCi/L · 1,661 tests · 17.6 points above Cuyahoga County
- Radon levels in Summit CountyEPA zone 1
38.7%at or above 4 pCi/L
Median 3.1 pCi/L · 6,486 tests · 17.0 points above Cuyahoga County
- Radon levels in Lake CountyEPA zone 2
27.2%at or above 4 pCi/L
Median 2.4 pCi/L · 2,349 tests · 5.5 points above Cuyahoga County
- Radon levels in Geauga CountyEPA zone 2
23.4%at or above 4 pCi/L
Median 2.4 pCi/L · 1,469 tests · 1.7 points above Cuyahoga County
Cuyahoga County, Cities and towns
Cities and towns in Cuyahoga County
About 1,232,925 people live in Cuyahoga County by the Census Bureau's estimate for July 1, 2025, 29,694 fewer than in 2020 (−2.4%). Packed into its land, that is 2,697 people per square mile. Its largest town, Cleveland, has 363,608 residents, 29.5% of the total. CDC's 10,092 reported tests for 2008 to 2017 work out to 8.2 per 1,000 residents (2025 estimate), close to Ohio's 8.3.
From Cleveland to Linndale, CDC publishes no figure by town: each reads Cuyahoga County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cleveland | 363,608 | −2.2% | 29.5% |
| Parma | 78,581 | −2.9% | 6.4% |
| Lakewood | 49,027 | −3.5% | 4.0% |
| Euclid | 47,962 | −3.3% | 3.9% |
| Strongsville | 45,629 | −1.7% | 3.7% |
| Cleveland Heights | 43,750 | −3.3% | 3.5% |
| Westlake | 33,904 | −0.9% | 2.7% |
| North Olmsted | 31,542 | −2.6% | 2.6% |
| North Royalton | 30,936 | −1.1% | 2.5% |
| Garfield Heights | 28,790 | −3.2% | 2.3% |
| Shaker Heights | 28,466 | −3.2% | 2.3% |
| Solon | 23,679 | −2.2% | 1.9% |
Places in Cuyahoga County with a city page: 1 of 2
- Maple Heights
- Rocky River
- South Euclid
- Parma Heights
- Broadview Heights
- Mayfield Heights
- Brook Park
- Berea
- Fairview Park
- Bay Village
- Middleburg Heights
- Brecksville
- Beachwood
- Lyndhurst
- Warrensville Heights
- East Cleveland
- University Heights
- Bedford
- Seven Hills
- Brooklyn
- Bedford Heights
- Richmond Heights
- Olmsted Falls
- Highland Heights
The other 21 places in Cuyahoga County
- Independence
- Pepper Pike
- Chagrin Falls
- Orange
- Moreland Hills
- Oakwood
- Mayfield
- Gates Mills
- Walton Hills
- Valley View
- Newburgh Heights
- Brooklyn Heights
- Bratenahl
- North Randall
- Glenwillow
- Bentleyville
- Highland Hills
- Hunting Valley (part)
- Woodmere
- Cuyahoga Heights
- Linndale
57 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Cuyahoga County, Homes
Homes in Cuyahoga County
Of Cuyahoga County's 615,513 homes, 59% are detached houses, against 69% across Ohio; 24% are in buildings of five or more homes. The homes are older than Ohio's as a whole: half were built before 1957 (1970 for Ohio), and 57% date from before 1960. 59% of occupied homes are lived in by their owner (Ohio: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Cuyahoga County | Ohio |
|---|---|---|
| Housing units | 615,513 | 5,271,573 |
| Detached houses | 59% | 69% |
| In buildings of 5 or more | 24% | 15% |
| Mobile homes | 1% | 4% |
| Built before 1960 | 57% | 38% |
| Built since 2000 | 7% | 16% |
| Middle year built | 1957 | 1970 |
| Owner-occupied | 59% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.