Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Johnson County, Georgia
EPA puts Johnson County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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
16.1%
Laurens County
- Laurens
- 16.1%
1 of 6 neighbours have 30+ tests, 2007 to 2016
Nearest county
16.1%
Laurens County, 22 miles
- Laurens
- 16.1%
- Georgia
- 23.9%
Share at 4+ pCi/L, 31 tests, 2007 to 2016
Ground above low
None
26.5 pts below Georgia
- Johnson
- 0.0%
- Georgia
- 26.5%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Johnson
- 1
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Johnson 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
Johnson County, At a glance
Johnson County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Johnson County, 2008 to 2017, laboratory
CDC holds 1 reported test for Johnson County over the 2008 to 2017 laboratory totals, a result of 2.2 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Johnson County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Johnson 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).
Johnson County, Compared
Johnson County radon figures, compared
Calculated by Radon411CDC's largest figure for Johnson County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 2.2 pCi/L, with a middle value of 2.2 pCi/L.
Laurens County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 16.1% of its tests at or above 4 pCi/L. Farther out, Richmond County (57 miles away) at 0.0%, Jones County (57 miles away) at 26.5% and Putnam County (59 miles away) at 27.3% have figures too. Pooled across 137 Georgia counties, 23.9% of reported tests reached that level; across every county in the country with a figure, 35.8%.
Statewide for the same period, Barrow County reported the highest share (51.0%) and Dougherty County the lowest (0.0%). EPA's 1993 map puts Johnson County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Johnson County, Geology
The ground under Johnson County
PredictedUSGS's geologic map puts all of Johnson County's mapped land in one class: low radon potential. All of it lies in the area the map calls Coastal Plain, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plain | Cretaceous and Tertiary marine and coastal sediments including limestone, sandstone, sand, silt, and clay. Coastal plan sands containing glauconite may generate locally elevated radon. | Low | 8 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Johnson County beside the ground around it
Across Georgia 26.5% of the land is rated moderate; none of Johnson County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Johnson County, Local resources
Radon testing and mitigation in Johnson County
- Georgia's radon programGeorgia Attorney General's Consumer Protection DivisionGeorgia's radon program does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Georgia.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
A kit costs $15.00 if mailed or $10.00 if picked up at a participating County Extension office.
- Compare kits
- Professionals in Georgia3 professionals are listed in Georgia.
What Georgia's program says
- Licensing of radon professionals
There are no laws mandating a mitigator receive certification in Georgia, however, many mitigators choose to get certified by one of two national programs.
What it means
Johnson County, Questions
Questions about radon in Johnson County
Are radon levels high in Johnson County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Johnson County, Georgia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Laurens County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 16.1% of its tests at or above 4 pCi/L.
Which counties border Johnson County?
Johnson County borders 6 counties: Treutlen County, Emanuel County, Laurens County, Washington County, Jefferson County and Wilkinson County.
Products
Johnson County, Products
Testing a home in Johnson County
No CDC figure names Johnson County; the nearest county with one, Laurens County (22 miles away), reported 16.1% of its tests at or above 4 pCi/L over the 2007 to 2016 laboratory totals, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Johnson County.
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
Monitor
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Johnson County, Bordering counties
Counties bordering Johnson County
Calculated by Radon411- Radon levels in Laurens CountyEPA zone 3
16.1%at or above 4 pCi/L
Median 0.9 pCi/L · 31 tests
- Radon levels in Treutlen CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 4 tests
- Radon levels in Emanuel CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 1 test
- Radon levels in Washington CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 2 tests
- Radon levels in Jefferson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 3 tests
- Radon levels in Wilkinson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
Johnson County, Cities and towns
Cities and towns in Johnson County
The Census Bureau estimates 9,310 residents in Johnson County for July 1, 2025, 130 more than in 2020 (+1.4%). That works out to 31 people per square mile of land. Its largest town, Wrightsville, has 3,585 residents, 38.5% of the total. Reported testing is thin here: 1 test over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Georgia as a whole comes to 2.7.
From Wrightsville to Kite, CDC publishes no figure by town: each reads Johnson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Wrightsville | 3,585 | +3.4% | 38.5% |
| Adrianextends beyond Johnson County | 566 | +2.7% | Counted whole |
| Kite | 156 | −2.5% | 1.7% |
3 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 Johnson County is counted whole, so it has no share.
Johnson County, Homes
Homes in Johnson County
Of Johnson County's 3,571 homes, 61% are detached houses, against 66% across Georgia; 32% are mobile homes. Half of its homes were built before 1984, close to Georgia's 1991: 20% date from before 1960 and 18% from 2000 or later. Owners live in 75% of the occupied homes (Georgia: 65%), so for most households a test and a fix are their own to order.
| Homes | Johnson County | Georgia |
|---|---|---|
| Housing units | 3,571 | 4,483,873 |
| Detached houses | 61% | 66% |
| In buildings of 5 or more | 4% | 16% |
| Mobile homes | 32% | 8% |
| Built before 1960 | 20% | 12% |
| Built since 2000 | 18% | 33% |
| Middle year built | 1984 | 1991 |
| Owner-occupied | 75% | 65% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.