Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Gallia County, Ohio
EPA puts Gallia County in Zone 2, its middle radon zone, and only 21 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
41.7%
Jackson County
- Jackson
- 41.7%
- Cabell
- 16.6%
3 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
30.3%
Lawrence County, 20 miles
- Lawrence
- 30.3%
- Ohio
- 52.3%
Share at 4+ pCi/L, 66 tests, 2008 to 2017
Ground above low
100.0%
0.1 pts above Ohio
- Gallia
- 100.0%
- Ohio
- 99.9%
Share of land USGS rates moderate or high potential
Tests reported
28
Too few for a share
- Gallia
- 28
- Needed
- 30
2006 to 2015, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Gallia County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 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.
The data
Gallia County, At a glance
Gallia County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Gallia 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 Gallia County, 2008 to 2017, laboratory
CDC holds 21 reported tests for Gallia County over the 2008 to 2017 laboratory totals, with a median of 3.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Gallia County beside the counties around it is how this page reads it.
What these figures count
Only 21 tests were reported to CDC for Gallia County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Gallia County, Compared
Gallia County radon figures, compared
Calculated by Radon411CDC's largest figure for Gallia County rests on 28 tests over the 2006 to 2015 laboratory totals, 12 of them at or above 4 pCi/L, so each test moves its share by 3.6 points and no rank or comparison is drawn from it. Results reached as high as 43.3 pCi/L, with a middle value of 3.3 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Jackson County reported the largest share at or above 4 pCi/L, 41.7%, and Cabell County, WV the smallest, 16.6%, with Lawrence County at 30.3% between. Farther out, Scioto County (37 miles away) at 37.0%, Athens County (38 miles away) at 38.1% and Pike County (44 miles away) at 56.1% have figures too. Pooled across 88 Ohio counties, 52.3% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Pickaway County reported the highest share (81.4%) and Cuyahoga County the lowest (21.7%). EPA's 1993 map puts Gallia County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Gallia County, Geology
The ground under Gallia County
PredictedUSGS's geologic map puts all of Gallia County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Unglaciated Plateau, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Unglaciated Plateau | Mississippian through Permian limestone, dolomite, and shale. | Moderate | 11 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Gallia County beside the ground around it
Across Ohio 62.8% of the land is rated high; none of Gallia County's is. Of the 6 counties that border it, 3 have more high-potential ground, Vinton County the most at 19.3%.
The map rates the ground, not the air in any home.
Local help
Gallia County, Local resources
Radon testing and mitigation in Gallia 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.
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
Gallia County, Questions
Questions about radon in Gallia County
Are radon levels high in Gallia County?
Over the 2008 to 2017 laboratory totals, 33.3% of the radon tests reported to CDC for Gallia County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Jackson County reported the largest share at or above 4 pCi/L, 41.7%, and Cabell County, WV the smallest, 16.6%, with Lawrence County at 30.3% between.
Which counties border Gallia County?
Gallia County borders 6 counties: Lawrence County, OH, Jackson County, OH, Mason County, WV, Meigs County, OH, Cabell County, WV and Vinton County, OH.
Products
Gallia County, Products
Testing a home in Gallia County
No CDC figure names Gallia County; the nearest county with one, Lawrence County (20 miles away), reported 30.3% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Gallia County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Gallia County, Bordering counties
Counties bordering Gallia County
Calculated by Radon411- Radon levels in Jackson County, OHEPA zone 2
41.7%at or above 4 pCi/L
Median 3.3 pCi/L · 48 tests
- Radon levels in Lawrence County, OHEPA zone 2
30.3%at or above 4 pCi/L
Median 2.5 pCi/L · 66 tests
- Radon levels in Vinton County, OHEPA zone 2
25.0%at or above 4 pCi/L
Median 1.9 pCi/L · 4 tests
- Radon levels in Mason County, WVEPA zone 2
23.1%at or above 4 pCi/L
Median 2.4 pCi/L · 13 tests
- Radon levels in Meigs County, OHEPA zone 2
20.0%at or above 4 pCi/L
Median 2.7 pCi/L · 20 tests
- Radon levels in Cabell County, WVEPA zone 2
16.6%at or above 4 pCi/L
Median 2.0 pCi/L · 145 tests
Gallia County, Cities and towns
Cities and towns in Gallia County
About 29,072 people live in Gallia County by the Census Bureau's estimate for July 1, 2025, 154 fewer than in 2020 (−0.5%). That works out to 62 people per square mile of land. No town dominates: Gallipolis, the largest, has 3,318 residents, 11.4% of the total. Together its 6 incorporated places hold 17.2% of those residents; the other 82.8% live outside any of them. Reported testing is thin here: 28 tests over 2006 to 2015, or 1.0 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 7.6.
From Gallipolis to Centerville (Thurman), CDC publishes no figure by town: each reads Gallia County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Gallipolis | 3,318 | −0.1% | 11.4% |
| Rio Grande | 837 | +15.6% | 2.9% |
| Crown City | 419 | −0.7% | 1.4% |
| Vinton | 224 | −0.4% | 0.8% |
| Cheshire | 123 | −1.6% | 0.4% |
| Centerville (Thurman) | 87 | −1.1% | 0.3% |
6 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).
Gallia County, Homes
Homes in Gallia County
Of Gallia County's 13,454 homes, 67% are detached houses, against 69% across Ohio; 24% are mobile homes. Much of Gallia County is recent building: 21% of its homes have gone up since 2000 and the middle year built is 1979, against 1970 for Ohio. Owners live in 76% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.
| Homes | Gallia County | Ohio |
|---|---|---|
| Housing units | 13,454 | 5,271,573 |
| Detached houses | 67% | 69% |
| In buildings of 5 or more | 3% | 15% |
| Mobile homes | 24% | 4% |
| Built before 1960 | 22% | 38% |
| Built since 2000 | 21% | 16% |
| Middle year built | 1979 | 1970 |
| Owner-occupied | 76% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.