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 Duval County, Florida
EPA puts Duval County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 6.2% of 792 (2023) reached 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
6.2%
12.3 pts below FL
- Duval
- 6.2%
- Florida
- 18.5%
792 tests, 2023
Median result
0.4pCi/L
Below action level
- Duval
- 0.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
792
9th of 30 by tests
- Duval
- 792
- Broward
- 2,165
Reported to CDC before any fix, 2023
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Florida
16 of 30
Middle half
- Duval
- 6.2%
- Marion
- 44.5%
By share, of 30 with 30+ tests
Read a result for Duval County
Starts at Duval County's median, 0.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.4 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Duval County's median reported result, 2023.
The data
Duval County, At a glance
Duval County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 96% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Duval County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 0.0% |
| 2016 | 0.4% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 1.4% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
| 2023 | 6.2% |
2023: 6.2%. Across these years the share ran from 0.0% to 6.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 792 tests reported to CDC for Duval County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Duval County, Compared
Duval County radon figures, compared
Calculated by Radon411Duval County reports fewer high tests than Florida overall. 6.2% of its 792 tests in 2023 were at or above 4 pCi/L. That is 12.3 points below the 18.5% pooled from 49 Florida counties.
Ordered from highest share down, it comes 16th of 30 Florida counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 33.4%; Duval County sits 27.2 points below it.
Next door, the shares run from 0.0% in Baker County to 0.0% in Nassau County, with Nassau County, Clay County and St. Johns County below Duval County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 6.2% share point the same way here.
Half the tests came in under 0.4 pCi/L and half over it; the single highest reached 10.4 pCi/L. The rest split 93.6% under 2 pCi/L and 0.3% from 2 to 4 (Florida: 57.3% and 24.2%). Year by year, 2014 opened at 0.0% and 2023 closed at 6.2% (up 6.2 points), with 2023 the high at 6.2%.
The busiest year on file was 2022, with 1,209 tests reported; the quietest, 2014, had 132.
Duval CountyFlorida, pooled
6.2% % of tests18.5% % of tests
| Year | Tests | Duval County, at or above 4 pCi/L | Florida, pooled |
|---|---|---|---|
| 2014 | 132 | 0.0% | 25.7% |
| 2015 | 200 | 0.0% | 26.5% |
| 2016 | 237 | 0.4% | 24.3% |
| 2017 | 331 | 0.0% | 21.7% |
| 2018 | 169 | 0.0% | 23.5% |
| 2019 | 420 | 1.4% | 29.6% |
| 2020 | 345 | 0.0% | 23.2% |
| 2021 | 181 | 0.0% | 15.4% |
| 2022 | 1,209 | 0.0% | 22.8% |
| 2023 | 792 | 6.2% | 18.5% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Duval County, Geology
The ground under Duval County
PredictedUSGS's geologic map puts all of Duval County's mapped land in one class: low radon potential. 96.1% 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 | 96.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Duval County beside the ground around it
Across Florida 7.1% of the land is rated moderate; none of Duval County's is. Of the 4 counties that border it, 1 has more moderate-potential ground, Baker County the most at 5.8%.
The map rates the ground, not the air in any home.
Local help
Duval County, Local resources
Radon testing and mitigation in Duval County
Listed radon businesses with an address in Duval 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.
Listed radon professionals by town: Jacksonville, Jacksonville Beach
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
Duval County, Questions
Questions about radon in Duval County
Are radon levels high in Duval County?
In 2023, 6.2% of the radon tests reported to CDC for Duval County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.4 pCi/L. Of 30 Florida counties with 30 or more tests for the same period, 15 reported a higher share; pooled, the state comes to 18.5%.
Which counties border Duval County?
Duval County borders 4 counties: Nassau County, Clay County, St. Johns County and Baker County.
Products
Duval County, Products
Testing a home in Duval County
In Duval County, 6.2% of 792 tests reported to CDC in 2023 reached 4 pCi/L, against 18.5% pooled across Florida. 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 Duval 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
Wave Radon battery smart radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- App only
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Duval County, Bordering counties
Counties bordering Duval County
Calculated by Radon411- Radon levels in Nassau CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 90 tests · 6.2 points below Duval County
- Radon levels in Clay CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 36 tests · 6.2 points below Duval County
- Radon levels in St. Johns CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 96 tests · 6.2 points below Duval County
- Radon levels in Baker CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 48 tests · 6.2 points below Duval County
Duval County, Cities and towns
Cities and towns in Duval County
Duval County is growing: the Census Bureau puts it at 1,062,963 residents on July 1, 2025, up 6.5% from 997,800 in 2020. Packed into its land, that is 1,394 people per square mile. Jacksonville alone is home to 1,017,689 of them, 95.7% of the total. Its 5 incorporated places account for all of those residents. CDC's 792 reported tests for 2023 work out to 0.7 per 1,000 residents (2025 estimate), close to Florida's 0.7.
From Jacksonville to Baldwin, CDC publishes no figure by town: each reads Duval County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Jacksonville | 1,017,689 | +6.9% | 95.7% |
| Jacksonville Beach | 23,615 | −0.9% | 2.2% |
| Atlantic Beach | 13,245 | −1.9% | 1.2% |
| Neptune Beach | 7,020 | −2.4% | 0.7% |
| Baldwin | 1,394 | −0.9% | 0.1% |
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).
Duval County, Homes
Homes in Duval County
Of Duval County's 445,946 homes, 60% are detached houses, against 55% across Florida; 24% are in buildings of five or more homes. Half of its homes were built before 1986, close to Florida's 1988: 19% date from before 1960 and 30% from 2000 or later. 58% of occupied homes are lived in by their owner (Florida: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Duval County | Florida |
|---|---|---|
| Housing units | 445,946 | 10,082,356 |
| Detached houses | 60% | 55% |
| In buildings of 5 or more | 24% | 25% |
| Mobile homes | 4% | 8% |
| Built before 1960 | 19% | 10% |
| Built since 2000 | 30% | 30% |
| Middle year built | 1986 | 1988 |
| Owner-occupied | 58% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.