Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Highlands County, Florida
EPA puts Highlands County in Zone 3, its lowest radon zone, and only 27 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
28.4%
Polk County
- Polk
- 28.4%
- Osceola
- 0.8%
4 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
4.4%
DeSoto County, 31 miles
- DeSoto
- 4.4%
- Florida
- 22.7%
Share at 4+ pCi/L, 45 tests, 2008 to 2017
Ground above low
None
7.1 pts below Florida
- Highlands
- 0.0%
- Florida
- 7.1%
Share of land USGS rates moderate or high potential
Tests reported
27
Too few for a share
- Highlands
- 27
- 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 Highlands 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
Highlands County, At a glance
Highlands 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 Highlands County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2018 | 10.0% |
| 2020 | 0.0% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 10.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 27 tests were reported to CDC for Highlands 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).
Highlands County, Compared
Highlands County radon figures, compared
Calculated by Radon411CDC's largest figure for Highlands County rests on 27 tests in 2022, 0 of them at or above 4 pCi/L, so each test moves its share by 3.7 points and no rank or comparison is drawn from it. Results reached as high as 2.1 pCi/L, with a middle value of 1.5 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Polk County reported the largest share at or above 4 pCi/L, 28.4%, and Osceola County the smallest, 0.8%, with Charlotte County at 25.3% and DeSoto County at 4.4% between. Farther out, Indian River County (51 miles away) at 2.5%, St. Lucie County (53 miles away) at 0.0% and Martin County (59 miles away) at 10.7% 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 Highlands 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.
Highlands County, Geology
The ground under Highlands County
PredictedUSGS's geologic map puts all of Highlands 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.
Highlands County beside the ground around it
Across Florida 7.1% of the land is rated moderate; none of Highlands County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Polk County the most at 33.7%.
The map rates the ground, not the air in any home.
Local help
Highlands County, Local resources
Radon testing and mitigation in Highlands 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
Highlands County, Questions
Questions about radon in Highlands County
Are radon levels high in Highlands County?
In 2022, 0.0% of the radon tests reported to CDC for Highlands County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Polk County reported the largest share at or above 4 pCi/L, 28.4%, and Osceola County the smallest, 0.8%, with Charlotte County at 25.3% and DeSoto County at 4.4% between.
Which counties border Highlands County?
Highlands County borders 7 counties: Glades County, Okeechobee County, Hardee County, DeSoto County, Charlotte County, Osceola County and Polk County.
Products
Highlands County, Products
Testing a home in Highlands County
No CDC figure names Highlands County; the nearest county with one, DeSoto County (31 miles away), reported 4.4% 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 Highlands 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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Highlands County, Bordering counties
Counties bordering Highlands County
Calculated by Radon411- Radon levels in Polk CountyEPA zone 2
28.4%at or above 4 pCi/L
Median 2.1 pCi/L · 617 tests
- Radon levels in Charlotte CountyEPA zone 3
25.3%at or above 4 pCi/L
Median 2.2 pCi/L · 162 tests
- Radon levels in DeSoto CountyEPA zone 3
4.4%at or above 4 pCi/L
Median 0.6 pCi/L · 45 tests
- Radon levels in Osceola CountyEPA zone 3
0.8%at or above 4 pCi/L
Median 0.8 pCi/L · 240 tests
- Radon levels in Glades CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.7 pCi/L · 3 tests
- Radon levels in Okeechobee CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.5 pCi/L · 3 tests
- Radon levels in Hardee CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.9 pCi/L · 1 test
Highlands County, Cities and towns
Cities and towns in Highlands County
Highlands County is growing: the Census Bureau puts it at 111,122 residents on July 1, 2025, up 9.7% from 101,341 in 2020. That works out to 109 people per square mile of land. No town dominates: Sebring, the largest, has 12,059 residents, 10.9% of the total. Together its 3 incorporated places hold 22.7% of those residents; the other 77.3% live outside any of them. Reported testing is thin here: 27 tests over 2022, or 0.2 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 2.6.
From Sebring to Lake Placid, CDC publishes no figure by town: each reads Highlands County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sebring | 12,059 | +10.0% | 10.9% |
| Avon Park | 10,514 | +9.0% | 9.5% |
| Lake Placid | 2,599 | +8.8% | 2.3% |
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).
Highlands County, Homes
Homes in Highlands County
Of Highlands County's 58,086 homes, 61% are detached houses, against 55% across Florida; 24% are mobile homes. Half of its homes were built before 1986, close to Florida's 1988: 8% date from before 1960 and 21% from 2000 or later. Owners live in 79% of the occupied homes (Florida: 67%), so for most households a test and a fix are their own to order.
| Homes | Highlands County | Florida |
|---|---|---|
| Housing units | 58,086 | 10,082,356 |
| Detached houses | 61% | 55% |
| In buildings of 5 or more | 5% | 25% |
| Mobile homes | 24% | 8% |
| Built before 1960 | 8% | 10% |
| Built since 2000 | 21% | 30% |
| Middle year built | 1986 | 1988 |
| Owner-occupied | 79% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.