Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Franklin County, Florida
EPA puts Franklin County in Zone 3, its lowest radon zone, and only 12 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
8.9%
Wakulla County
- Wakulla
- 8.9%
1 of 3 neighbours have 30+ tests, 2008 to 2017
Nearest county
8.9%
Wakulla County, 32 miles
- Wakulla
- 8.9%
- Florida
- 22.7%
Share at 4+ pCi/L, 79 tests, 2008 to 2017
Ground above low
None
7.1 pts below Florida
- Franklin
- 0.0%
- Florida
- 7.1%
Share of land USGS rates moderate or high potential
Tests reported
12
Too few for a share
- Franklin
- 12
- Needed
- 30
2022
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 Franklin 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
Franklin County, At a glance
Franklin County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 91% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Franklin County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 12 tests were reported to CDC for Franklin County over 2022, 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: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).
Franklin County, Compared
Franklin County radon figures, compared
Calculated by Radon411CDC's largest figure for Franklin County rests on 12 tests in 2022, 0 of them at or above 4 pCi/L, so each test moves its share by 8.3 points and no rank or comparison is drawn from it. Results reached as high as 0.7 pCi/L, with a middle value of 0.3 pCi/L.
Wakulla County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 8.9% of its tests at or above 4 pCi/L. Farther out, Gadsden County (50 miles away) at 6.3%, Leon County (51 miles away) at 23.3% and Jefferson County (67 miles away) at 6.1% have figures too. Pooled across 62 Florida counties, 22.7% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Marion County reported the highest share (42.9%) and St. Lucie County the lowest (0.0%). EPA's 1993 map puts Franklin County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 91% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Franklin County, Geology
The ground under Franklin County
PredictedUSGS's geologic map puts all of Franklin County's mapped land in one class: low radon potential. 91.4% of it lies in the area the map calls Gulf/Atlantic Lowland and Central Highland, to which USGS gives a radon index of 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Gulf/Atlantic Lowland and Central Highland | sand, silt, clay, gravel | Low | 6 | 91.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Franklin County beside the ground around it
Across Florida 7.1% of the land is rated moderate; none of Franklin County's is. None of the 3 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Franklin County, Local resources
Radon testing and mitigation in Franklin County
- Florida’s Radon ProgramFlorida’s Radon Program, run by Florida Department of Health, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Florida.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Protect your family by requesting a FREE radon test kit.
- Compare kits
- Professionals in Florida77 professionals are listed in Florida.
What Florida's program says
- Phone
- 850-245-4288
- PHtoxicology@FLhealth.gov
- Licensing of radon professionals
Florida Statutes require the certification of businesses and individuals providing radon services or any other radon related activity.
What it means
Franklin County, Questions
Questions about radon in Franklin County
Are radon levels high in Franklin County?
In 2022, 0.0% of the radon tests reported to CDC for Franklin County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.3 pCi/L. Wakulla County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 8.9% of its tests at or above 4 pCi/L.
Which counties border Franklin County?
Franklin County borders 3 counties: Gulf County, Liberty County and Wakulla County.
Products
Franklin County, Products
Testing a home in Franklin County
No CDC figure names Franklin County; the nearest county with one, Wakulla County (32 miles away), reported 8.9% 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. 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 Franklin County.
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
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Franklin County, Bordering counties
Counties bordering Franklin County
Calculated by Radon411- Radon levels in Wakulla CountyEPA zone 3
8.9%at or above 4 pCi/L
Median 1.5 pCi/L · 79 tests
- Radon levels in Gulf CountyEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Liberty CountyEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Franklin County, Cities and towns
Cities and towns in Franklin County
The Census Bureau estimates 13,029 residents in Franklin County for July 1, 2025, 556 more than in 2020 (+4.5%). That works out to 24 people per square mile of land. No town dominates: Carrabelle, the largest, has 2,572 residents, 19.7% of the total. Together its 2 incorporated places hold 38.7% of those residents; the other 61.3% live outside any of them. Reported testing is thin here: 12 tests over 2022, or 0.9 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 2.6.
From Carrabelle to Apalachicola, CDC publishes no figure by town: each reads Franklin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Carrabelle | 2,572 | −1.9% | 19.7% |
| Apalachicola | 2,473 | +5.8% | 19.0% |
2 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).
Franklin County, Homes
Homes in Franklin County
Of Franklin County's 8,476 homes, 72% are detached houses, against 55% across Florida; 15% are mobile homes. Half of its homes were built before 1986, close to Florida's 1988: 17% date from before 1960 and 26% from 2000 or later. Owners live in 77% of the occupied homes (Florida: 67%), so for most households a test and a fix are their own to order.
| Homes | Franklin County | Florida |
|---|---|---|
| Housing units | 8,476 | 10,082,356 |
| Detached houses | 72% | 55% |
| In buildings of 5 or more | 6% | 25% |
| Mobile homes | 15% | 8% |
| Built before 1960 | 17% | 10% |
| Built since 2000 | 26% | 30% |
| Middle year built | 1986 | 1988 |
| Owner-occupied | 77% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.