Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Hernando County, Florida
EPA puts Hernando County in Zone 3, its lowest radon zone, and only 5 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
Share at 4+ pCi/L
1.8%
20.9 pts below FL
- Hernando
- 1.8%
- Florida
- 22.7%
223 tests, 2008 to 2017
Median result
0.8pCi/L
Below action level
- Hernando
- 0.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
223
20th of 40 by tests
- Hernando
- 223
- Collier
- 20,308
Reported to CDC before any fix, 2008 to 2017
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
34 of 40
Lowest quarter
- Hernando
- 1.8%
- Marion
- 42.9%
By share, of 40 with 30+ tests
Read a result for Hernando County
Starts at Hernando County's median, 0.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.8 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. Hernando County's median reported result, 2008 to 2017.
The data
Hernando County, At a glance
Hernando County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 59% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Hernando County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.0% |
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 5 tests were reported to CDC for Hernando 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).
Hernando County, Compared
Hernando County radon figures, compared
Calculated by Radon411Only 4 of 223 radon tests reported for Hernando County over the 2008 to 2017 laboratory totals reached 4 pCi/L (1.8%). The median result, 0.8 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 8.5 pCi/L.
The newest figure, in 2023, counts only 5 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 223-test figure.
Across 62 Florida counties pooled together, 22.7% of tests reached that level, so Hernando County runs 20.9 points below its state. Against the national pool of 35.7%, the gap is 33.9 points lower. Its place in the state: 34th of 40 Florida counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 1.8% share point the same way here. Of 3 neighbours with a figure, all 3 reported a larger share at or above 4 pCi/L; the spread is 9.9% (Citrus County) to 25.9% (Sumter County).
Below the action level, 203 tests (91.0%) came in under 2 pCi/L, against 45.5% statewide, and 16 tests (7.2%) fell between 2 and 4, against 31.8% statewide. USGS geology rates 59% of the county's land low radon potential.
The busiest year on file was 2018, with 53 tests reported; the quietest, 2015, had 1.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hernando County, Geology
The ground under Hernando County
PredictedUSGS's geologic map splits Hernando County: 58.6% of its land is low radon potential and 39.1% moderate. The map puts 58.6% of Hernando County in the area it calls Gulf/Atlantic Lowland and Central Highland and 39.1% in Highland Anomalous areas. USGS gives the first a radon index of 6, in the low band (5 to 8), and the second 11, in the moderate band (9 to 11).
| 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 | 58.6% |
| Highland Anomalous areas | Phosphate deposits. | Moderate | 11 | 39.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hernando County beside the ground around it
Hernando County has more moderate-potential ground than Florida as a whole: 39.1% of its land against 7.1%. Of the 3 counties that border it, 1 has more moderate-potential ground, Citrus County the most at 50.4%.
The map rates the ground, not the air in any home.
Local help
Hernando County, Local resources
Radon testing and mitigation in Hernando 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
Hernando County, Questions
Questions about radon in Hernando County
Are radon levels high in Hernando County?
In 2023, 0.0% of the radon tests reported to CDC for Hernando County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.2 pCi/L. Of 40 Florida counties with 30 or more tests for the same period, 33 reported a higher share; pooled, the state comes to 22.7%.
Which counties border Hernando County?
Hernando County borders 3 counties: Pasco County, Sumter County and Citrus County.
Products
Hernando County, Products
Testing a home in Hernando County
In Hernando County, 1.8% of 223 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.7% 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 Hernando 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
MonitorAranet
Radon One battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- 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
Hernando County, Bordering counties
Counties bordering Hernando County
Calculated by Radon411- Radon levels in Sumter CountyEPA zone 3
25.9%at or above 4 pCi/L
Median 1.7 pCi/L · 58 tests · 24.1 points above Hernando County
- Radon levels in Pasco CountyEPA zone 3
10.4%at or above 4 pCi/L
Median 0.8 pCi/L · 154 tests · 8.6 points above Hernando County
- Radon levels in Citrus CountyEPA zone 2
9.9%at or above 4 pCi/L
Median 1.6 pCi/L · 162 tests · 8.1 points above Hernando County
Hernando County, Cities and towns
Cities and towns in Hernando County
Hernando County is growing: the Census Bureau puts it at 221,701 residents on July 1, 2025, up 13.3% from 195,610 in 2020. That works out to 469 people per square mile of land. No town dominates: Brooksville, the largest, has 10,145 residents, 4.6% of the total. Reported testing is thin here: 223 tests over 2008 to 2017, or 1.0 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 2.3.
From Brooksville to Weeki Wachee, CDC publishes no figure by town: each reads Hernando County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Brooksville | 10,145 | +13.7% | 4.6% |
- Weeki Wachee
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).
Hernando County, Homes
Homes in Hernando County
Hernando County is a place of houses on their own lots: 75% of its 90,991 homes are detached single-family houses, against 55% across Florida. Half of its homes were built before 1990, close to Florida's 1988: 3% date from before 1960 and 32% from 2000 or later. 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 | Hernando County | Florida |
|---|---|---|
| Housing units | 90,991 | 10,082,356 |
| Detached houses | 75% | 55% |
| In buildings of 5 or more | 4% | 25% |
| Mobile homes | 16% | 8% |
| Built before 1960 | 3% | 10% |
| Built since 2000 | 32% | 30% |
| Middle year built | 1990 | 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.