Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Sumter County, Florida
EPA puts Sumter County in Zone 3, its lowest radon zone, and only 12 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
10.7%
12.1 pts below FL
- Sumter
- 10.7%
- Florida
- 22.8%
84 tests, 2022
Median result
1.9pCi/L
Below action level
- Sumter
- 1.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
84
31st of 40 by tests
- Sumter
- 84
- Miami-Dade
- 9,033
Reported to CDC before any fix, 2022
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
18 of 40
Middle half
- Sumter
- 10.7%
- Palm Beach
- 54.7%
By share, of 40 with 30+ tests
Read a result for Sumter County
Starts at Sumter County's median, 1.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.9 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. Sumter County's median reported result, 2022.
The data
Sumter County, At a glance
Sumter County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 81% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Sumter County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 0.0% |
| 2017 | 37.8% |
| 2018 | 0.0% |
| 2019 | 20.0% |
| 2020 | 0.0% |
| 2021 | 7.7% |
| 2022 | 10.7% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 37.8%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 12 tests were reported to CDC for Sumter 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).
Sumter County, Compared
Sumter County radon figures, compared
Calculated by Radon411Sumter County reports fewer high tests than Florida overall. 10.7% of its 84 tests in 2022 were at or above 4 pCi/L. That is 12.1 points below the 22.8% pooled from 54 Florida counties.
The newest figure, in 2023, counts only 12 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 84-test figure.
Ordered from highest share down, it comes 18th of 40 Florida counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 23.9%; Sumter County sits 13.2 points below it.
Next door, the shares run from 0.0% in Lake County to 31.9% in Marion County, with Polk County, Pasco County and Lake County below Sumter County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 10.7% share point the same way here.
Half the tests came in under 1.9 pCi/L and half over it; the single highest reached 5.9 pCi/L. The rest split 53.6% under 2 pCi/L and 35.7% from 2 to 4 (Florida: 52.6% and 24.6%).
The busiest year on file was 2022, with 84 tests reported; the quietest, 2015, had 2.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sumter County, Geology
The ground under Sumter County
PredictedMost of the ground under Sumter County is one class on USGS's geologic map: 80.6% of its land is low radon potential, with 19.4% moderate. The map puts 80.6% of Sumter County in the area it calls Gulf/Atlantic Lowland and Central Highland and 19.4% 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 | 80.6% |
| Highland Anomalous areas | Phosphate deposits. | Moderate | 11 | 19.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sumter County beside the ground around it
Sumter County has more moderate-potential ground than Florida as a whole: 19.4% of its land against 7.1%. Of the 6 counties that border it, 5 have more moderate-potential ground, Citrus County the most at 50.4%.
The map rates the ground, not the air in any home.
Local help
Sumter County, Local resources
Radon testing and mitigation in Sumter 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
Sumter County, Questions
Questions about radon in Sumter County
Are radon levels high in Sumter County?
In 2023, 0.0% of the radon tests reported to CDC for Sumter County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 40 Florida counties with 30 or more tests for the same period, 17 reported a higher share; pooled, the state comes to 22.8%.
Which counties border Sumter County?
Sumter County borders 6 counties: Hernando County, Pasco County, Lake County, Citrus County, Marion County and Polk County.
Products
Sumter County, Products
Testing a home in Sumter County
In Sumter County, 10.7% of 84 tests reported to CDC in 2022 reached 4 pCi/L, against 22.8% 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 Sumter 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
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Sumter County, Bordering counties
Counties bordering Sumter County
Calculated by Radon411- Radon levels in Marion CountyEPA zone 2
31.9%at or above 4 pCi/L
Median 2.8 pCi/L · 546 tests · 21.2 points above Sumter County
- Radon levels in Polk CountyEPA zone 2
10.3%at or above 4 pCi/L
Median 2.0 pCi/L · 1,713 tests · 0.4 points below Sumter County
- Radon levels in Pasco CountyEPA zone 3
0.8%at or above 4 pCi/L
Median 0.8 pCi/L · 381 tests · 9.9 points below Sumter County
- Radon levels in Hernando CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.8 pCi/L · 6 tests · 10.7 points below Sumter County
- Radon levels in Lake CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 168 tests · 10.7 points below Sumter County
- Radon levels in Citrus CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.4 pCi/L · 6 tests · 10.7 points below Sumter County
Sumter County, Cities and towns
Cities and towns in Sumter County
Sumter County is growing: the Census Bureau puts it at 157,772 residents on July 1, 2025, up 21.1% from 130,293 in 2020. That works out to 283 people per square mile of land. No town dominates: Wildwood, the largest, has 19,436 residents, 12.3% of the total. Together its 5 incorporated places hold 16.1% of those residents; the other 83.9% live outside any of them. Reported testing is thin here: 84 tests over 2022, or 0.5 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 2.6.
From Wildwood to Coleman, CDC publishes no figure by town: each reads Sumter County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Wildwood | 19,436 | +21.8% | 12.3% |
| Bushnell | 3,157 | −0.1% | 2.0% |
| Center Hill | 1,081 | +23.5% | 0.7% |
| Webster | 989 | +22.9% | 0.6% |
| Coleman | 803 | +22.0% | 0.5% |
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).
Sumter County, Homes
Homes in Sumter County
Sumter County is a place of houses on their own lots: 82% of its 80,371 homes are detached single-family houses, against 55% across Florida. Much of Sumter County is recent building: 69% of its homes have gone up since 2000 and the middle year built is 2005, against 1988 for Florida. Owners live in 88% of the occupied homes (Florida: 67%), so for most households a test and a fix are their own to order.
| Homes | Sumter County | Florida |
|---|---|---|
| Housing units | 80,371 | 10,082,356 |
| Detached houses | 82% | 55% |
| In buildings of 5 or more | 3% | 25% |
| Mobile homes | 13% | 8% |
| Built before 1960 | 3% | 10% |
| Built since 2000 | 69% | 30% |
| Middle year built | 2005 | 1988 |
| Owner-occupied | 88% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.