Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Morrow County, Ohio
EPA puts Morrow County in Zone 1, its highest radon zone, and high results are common there: 65.0% of the 177 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
65.0%
12.7 pts above OH
- Morrow
- 65.0%
- Ohio
- 52.3%
177 tests, 2008 to 2017
Median result
5.7pCi/L
Action level reached
- Morrow
- 5.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
177
57th of 79 by tests
- Morrow
- 177
- Franklin
- 16,142
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Ohio
15 of 79
Top quarter
- Morrow
- 65.0%
- Pickaway
- 81.4%
By share, of 79 with 30+ tests
Read a result for Morrow County
Starts at Morrow County's median, 5.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 5.7 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Morrow County's median reported result, 2008 to 2017.
The data
Morrow County, At a glance
Morrow County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Morrow County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Morrow County, 2008 to 2017, laboratory
Under 2 pCi/L: 18%2 to 4 pCi/L: 17%4 pCi/L and above: 65%
Of 177 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 31 | 17.5% |
| 2 to 4 pCi/L | 31 | 17.5% |
| 4 pCi/L and above | 115 | 65.0% |
What these figures count
These are the 177 tests reported to CDC for Morrow 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).
Morrow County, Compared
Morrow County radon figures, compared
Calculated by Radon411More than half: 65.0% of the 177 radon tests reported to CDC for Morrow County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 15th of 79 Ohio counties with 30 or more tests for the same period. That is 12.7 points above the 52.3% pooled from 88 Ohio counties.
The median result, 5.7 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 62.9 pCi/L. The rest split 17.5% under 2 pCi/L and 17.5% from 2 to 4 (Ohio: 23.1% and 24.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 65.0% share point the same way here.
3 of its 5 bordering counties with figures ran higher, led by Delaware County at 72.2%; Crawford County reported 59.5%. Statewide for the same period, Pickaway County reported the highest share (81.4%) and Cuyahoga County the lowest (21.7%).
CDC's ten-year totals for Morrow County went from 126 tests (2005 to 2014) to 177 (2008 to 2017), the share going from 64.3% to 65.0%.
Nationally, every county with a figure for the same period pools to 35.7%; Morrow County sits 29.3 points above it. CDC also counts 6 tests taken after mitigation in Morrow 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.
Morrow County, Geology
The ground under Morrow County
PredictedUSGS's geologic map puts all of Morrow County's mapped land in one class: high radon potential. All of it lies in the area the map calls Till Plains, to which USGS gives a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Till Plains | Glacial deposits underlain by Ordovician through Devonian limestone and shale. | High | 14 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Morrow County beside the ground around it
Morrow County has more high-potential ground than Ohio as a whole: 100% of its land against 62.8%. Of the 5 counties that border it, none has as large a share of high-potential ground; Crawford County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Morrow County, Local resources
Radon testing and mitigation in Morrow County
Listed radon businesses with an address in Morrow 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: Galion, Mount Gilead
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
Morrow County, Questions
Questions about radon in Morrow County
Are radon levels high in Morrow County?
Over the 2008 to 2017 laboratory totals, 65.0% of the radon tests reported to CDC for Morrow County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.7 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 14 reported a higher share; pooled, the state comes to 52.3%.
Which counties border Morrow County?
Morrow County borders 5 counties: Delaware County, Marion County, Richland County, Knox County and Crawford County.
Products
Morrow County, Products
Testing a home in Morrow County
In Morrow County, 65.0% of 177 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 1 the year-round level in Morrow County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Morrow County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Morrow County
Explore
Morrow County, Bordering counties
Counties bordering Morrow County
Calculated by Radon411- Radon levels in Delaware CountyEPA zone 1
72.2%at or above 4 pCi/L
Median 6.4 pCi/L · 3,730 tests · 7.2 points above Morrow County
- Radon levels in Knox CountyEPA zone 1
72.0%at or above 4 pCi/L
Median 8.1 pCi/L · 1,530 tests · 7.0 points above Morrow County
- Radon levels in Marion CountyEPA zone 1
65.3%at or above 4 pCi/L
Median 6.4 pCi/L · 265 tests · 0.3 points above Morrow County
- Radon levels in Richland CountyEPA zone 1
62.2%at or above 4 pCi/L
Median 5.2 pCi/L · 1,327 tests · 2.8 points below Morrow County
- Radon levels in Crawford CountyEPA zone 1
59.5%at or above 4 pCi/L
Median 4.7 pCi/L · 210 tests · 5.5 points below Morrow County
Morrow County, Cities and towns
Cities and towns in Morrow County
The Census Bureau estimates 36,305 residents in Morrow County for July 1, 2025, 1,309 more than in 2020 (+3.7%). That works out to 89 people per square mile of land. Galion, the largest place on its list (10,370 residents in all), extends beyond Morrow County, so no share of the total is worked out for it. Reported testing is thin here: 177 tests over 2008 to 2017, or 4.9 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.
From Galion to Sparta, CDC publishes no figure by town: each reads Morrow County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Galionextends beyond Morrow County | 10,370 | −0.7% | Counted whole |
| Mount Gilead | 3,575 | +2.1% | 9.8% |
| Cardington | 2,247 | +7.8% | 6.2% |
| Edison | 449 | +6.7% | 1.2% |
| Marengo | 285 | +1.8% | 0.8% |
| Fulton | 254 | +2.8% | 0.7% |
| Chesterville | 208 | +5.6% | 0.6% |
| Sparta | 127 | +1.6% | 0.3% |
8 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Morrow County is counted whole, so it has no share.
Morrow County, Homes
Homes in Morrow County
Morrow County is a place of houses on their own lots: 82% of its 14,615 homes are detached single-family houses, against 69% across Ohio. Much of Morrow County is recent building: 25% of its homes have gone up since 2000 and the middle year built is 1979, against 1970 for Ohio. Owners live in 82% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.
| Homes | Morrow County | Ohio |
|---|---|---|
| Housing units | 14,615 | 5,271,573 |
| Detached houses | 82% | 69% |
| In buildings of 5 or more | 3% | 15% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 29% | 38% |
| Built since 2000 | 25% | 16% |
| Middle year built | 1979 | 1970 |
| Owner-occupied | 82% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.