Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Flagler County, Florida
EPA puts Flagler County in Zone 3, its lowest radon zone, and only 2 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
6.0%
St. Johns County
- St. Johns
- 6.0%
- Putnam
- 1.1%
3 of 3 neighbours have 30+ tests, 2008 to 2017
Nearest county
1.1%
Putnam County, 28 miles
- Putnam
- 1.1%
- Florida
- 22.7%
Share at 4+ pCi/L, 95 tests, 2008 to 2017
Ground above low
None
7.1 pts below Florida
- Flagler
- 0.0%
- Florida
- 7.1%
Share of land USGS rates moderate or high potential
Tests reported
21
Too few for a share
- Flagler
- 21
- 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 Flagler 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
Flagler County, At a glance
Flagler 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 Flagler County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2021 | 0.0% |
| 2022 | 14.3% |
| 2023 | 100.0% |
2023: 100.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 2 tests were reported to CDC for Flagler County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Flagler County, Compared
Flagler County radon figures, compared
Calculated by Radon411CDC's largest figure for Flagler County rests on 21 tests in 2022, 3 of them at or above 4 pCi/L, so each test moves its share by 4.8 points and no rank or comparison is drawn from it. Results reached as high as 5.6 pCi/L, with a middle value of 0.5 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: St. Johns County reported the largest share at or above 4 pCi/L, 6.0%, and Putnam County the smallest, 1.1%, with Volusia County at 1.8% between. Farther out, Marion County (48 miles away) at 42.9%, Seminole County (51 miles away) at 4.2% and Lake County (54 miles away) at 3.1% 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 Flagler 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.
Flagler County, Geology
The ground under Flagler County
PredictedUSGS's geologic map puts all of Flagler County's mapped land in one class: low radon potential. All 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Flagler County beside the ground around it
Across Florida 7.1% of the land is rated moderate; none of Flagler 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
Flagler County, Local resources
Radon testing and mitigation in Flagler 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
Flagler County, Questions
Questions about radon in Flagler County
Are radon levels high in Flagler County?
In 2023, 100.0% of the radon tests reported to CDC for Flagler County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.4 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: St. Johns County reported the largest share at or above 4 pCi/L, 6.0%, and Putnam County the smallest, 1.1%, with Volusia County at 1.8% between.
Which counties border Flagler County?
Flagler County borders 3 counties: Putnam County, Volusia County and St. Johns County.
Products
Flagler County, Products
Testing a home in Flagler County
No CDC figure names Flagler County; the nearest county with one, Putnam County (28 miles away), reported 1.1% 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 Flagler 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
Monitor
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
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
Flagler County, Bordering counties
Counties bordering Flagler County
Calculated by Radon411- Radon levels in St. Johns CountyEPA zone 3
6.0%at or above 4 pCi/L
Median 0.7 pCi/L · 50 tests
- Radon levels in Volusia CountyEPA zone 3
1.8%at or above 4 pCi/L
Median 0.7 pCi/L · 457 tests
- Radon levels in Putnam CountyEPA zone 3
1.1%at or above 4 pCi/L
Median 0.1 pCi/L · 95 tests
Flagler County, Cities and towns
Cities and towns in Flagler County
Flagler County is growing: the Census Bureau puts it at 140,360 residents on July 1, 2025, up 21.0% from 116,031 in 2020. That works out to 289 people per square mile of land. Palm Coast alone is home to 109,886 of them, 78.3% of the total. Reported testing is thin here: 21 tests over 2022, or 0.1 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 2.6.
From Palm Coast to Marineland, CDC publishes no figure by town: each reads Flagler County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Palm Coast | 109,886 | +22.5% | 78.3% |
| Flagler Beachextends beyond Flagler County | 5,595 | +8.5% | Counted whole |
| Bunnell | 4,298 | +30.8% | 3.1% |
| Beverly Beach | 521 | +10.9% | 0.4% |
| Marinelandextends beyond Flagler County | 9 | +12.5% | Counted whole |
5 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 Flagler County is counted whole, so it has no share.
Flagler County, Homes
Homes in Flagler County
Flagler County is a place of houses on their own lots: 80% of its 58,520 homes are detached single-family houses, against 55% across Florida. Much of Flagler County is recent building: 55% of its homes have gone up since 2000 and the middle year built is 2001, against 1988 for Florida. Owners live in 82% of the occupied homes (Florida: 67%), so for most households a test and a fix are their own to order.
| Homes | Flagler County | Florida |
|---|---|---|
| Housing units | 58,520 | 10,082,356 |
| Detached houses | 80% | 55% |
| In buildings of 5 or more | 8% | 25% |
| Mobile homes | 4% | 8% |
| Built before 1960 | 1% | 10% |
| Built since 2000 | 55% | 30% |
| Middle year built | 2001 | 1988 |
| 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.