Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Lorain County, Ohio
EPA puts Lorain County in Zone 2, its middle radon zone, and high results are common there: 45.4% of the 3,307 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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
45.4%
6.9 pts below OH
- Lorain
- 45.4%
- Ohio
- 52.3%
3,307 tests, 2008 to 2017
Median result
3.6pCi/L
Below action level
- Lorain
- 3.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
3,307
8th of 79 by tests
- Lorain
- 3,307
- 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
57 of 79
Middle half
- Lorain
- 45.4%
- Pickaway
- 81.4%
By share, of 79 with 30+ tests
Read a result for Lorain County
Starts at Lorain County's median, 3.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.6 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. Lorain County's median reported result, 2008 to 2017.
The data
Lorain County, At a glance
Lorain County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Lorain 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 Lorain County, 2008 to 2017, laboratory
Under 2 pCi/L: 23%2 to 4 pCi/L: 32%4 pCi/L and above: 45%
Of 3,307 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 758 | 22.9% |
| 2 to 4 pCi/L | 1,049 | 31.7% |
| 4 pCi/L and above | 1,500 | 45.4% |
What these figures count
These are the 3,307 tests reported to CDC for Lorain 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).
Lorain County, Compared
Lorain County radon figures, compared
Calculated by Radon411In Lorain County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (1,500 of 3,307) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 9.7 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Lorain County runs 6.9 points below its state.
Of 5 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 21.7% (Cuyahoga County) to 62.9% (Ashland County). By share, Lorain County is 57th of 79 Ohio counties with 30 or more tests for the same period.
Half the tests came in under 3.6 pCi/L and half over it; the single highest reached 76.9 pCi/L. Below the action level, 758 tests (22.9%) came in under 2 pCi/L, against 23.1% statewide, and 1,049 tests (31.7%) fell between 2 and 4, against 24.6% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 45.4% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 406 tests taken after mitigation in Lorain County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Lorain County went from 2,189 tests (2005 to 2014) to 3,307 (2008 to 2017), the share going from 45.9% to 45.4%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Lorain County, Geology
The ground under Lorain County
PredictedUSGS's geologic map puts all of Lorain County's mapped land in one class: moderate radon potential. The map puts 69.6% of Lorain County in the area it calls Glaciated Plateau and 30.4% 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 | 69.6% |
| Lake Plains | Glacial lake deposits, Devonian shale and limestone. | Moderate | 10 | 30.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lorain County beside the ground around it
Across Ohio 62.8% of the land is rated high; none of Lorain County's is. Of the 5 counties that border it, 3 have more high-potential ground, Ashland County the most at 68.5%.
The map rates the ground, not the air in any home.
Local help
Lorain County, Local resources
Radon testing and mitigation in Lorain County
Listed radon businesses with an address in Lorain 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: Lorain, North Ridgeville, Avon Lake, Avon, Amherst, Oberlin, Wellington
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
Lorain County, Questions
Questions about radon in Lorain County
Are radon levels high in Lorain County?
Over the 2008 to 2017 laboratory totals, 45.4% of the radon tests reported to CDC for Lorain County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 56 reported a higher share; pooled, the state comes to 52.3%.
Which counties border Lorain County?
Lorain County borders 5 counties: Medina County, Cuyahoga County, Huron County, Erie County and Ashland County.
Products
Lorain County, Products
Testing a home in Lorain County
In Lorain County, 45.4% of 3,307 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 Lorain 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
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Lorain County, Bordering counties
Counties bordering Lorain County
Calculated by Radon411- Radon levels in Ashland CountyEPA zone 1
62.9%at or above 4 pCi/L
Median 5.4 pCi/L · 340 tests · 17.5 points above Lorain County
- Radon levels in Huron CountyEPA zone 1
59.4%at or above 4 pCi/L
Median 4.9 pCi/L · 796 tests · 14.0 points above Lorain County
- Radon levels in Erie CountyEPA zone 2
54.5%at or above 4 pCi/L
Median 4.4 pCi/L · 1,651 tests · 9.1 points above Lorain County
- Radon levels in Medina CountyEPA zone 2
43.4%at or above 4 pCi/L
Median 3.5 pCi/L · 2,139 tests · 2.0 points below Lorain County
- Radon levels in Cuyahoga CountyEPA zone 2
21.7%at or above 4 pCi/L
Median 2.0 pCi/L · 10,092 tests · 23.7 points below Lorain County
Lorain County, Cities and towns
Cities and towns in Lorain County
The Census Bureau estimates 323,219 residents in Lorain County for July 1, 2025, 9,705 more than in 2020 (+3.1%). That works out to 659 people per square mile of land. Its largest town, Lorain, has 65,366 residents, 20.2% of the total. CDC's 3,307 reported tests for 2008 to 2017 work out to 10.2 per 1,000 residents (2025 estimate), close to Ohio's 8.3.
From Lorain to Rochester, CDC publishes no figure by town: each reads Lorain County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lorain | 65,366 | +0.3% | 20.2% |
| Elyria | 53,634 | +1.9% | 16.6% |
| North Ridgeville | 37,786 | +6.6% | 11.7% |
| Avon Lake | 26,486 | +4.8% | 8.2% |
| Avon | 25,611 | +2.7% | 7.9% |
| Amherst | 12,974 | +1.7% | 4.0% |
| Vermilionextends beyond Lorain County | 10,695 | +0.3% | Counted whole |
| Sheffield Lake | 8,971 | +0.2% | 2.8% |
| Oberlin | 8,603 | −0.1% | 2.7% |
| Grafton | 5,764 | −3.0% | 1.8% |
| Wellington | 4,802 | −0.1% | 1.5% |
| Sheffield | 4,757 | +14.0% | 1.5% |
- LaGrange
- South Amherst
- Kipton
- Rochester
16 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). A place that extends beyond Lorain County is counted whole, so it has no share.
Lorain County, Homes
Homes in Lorain County
Lorain County is a place of houses on their own lots: 76% of its 135,584 homes are detached single-family houses, against 69% across Ohio. Half of its homes were built before 1972, close to Ohio's 1970: 34% date from before 1960 and 21% from 2000 or later. 74% 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 | Lorain County | Ohio |
|---|---|---|
| Housing units | 135,584 | 5,271,573 |
| Detached houses | 76% | 69% |
| In buildings of 5 or more | 11% | 15% |
| Mobile homes | 2% | 4% |
| Built before 1960 | 34% | 38% |
| Built since 2000 | 21% | 16% |
| Middle year built | 1972 | 1970 |
| Owner-occupied | 74% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.