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 Pasco County, Florida
EPA puts Pasco County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 0.6% of 164 (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
0.6%
17.9 pts below FL
- Pasco
- 0.6%
- Florida
- 18.5%
164 tests, 2023
Median result
0.8pCi/L
Below action level
- Pasco
- 0.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
164
17th of 30 by tests
- Pasco
- 164
- 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
22 of 30
Middle half
- Pasco
- 0.6%
- Marion
- 44.5%
By share, of 30 with 30+ tests
Read a result for Pasco County
Starts at Pasco 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. Pasco County's median reported result, 2023.
The data
Pasco County, At a glance
Pasco County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 76% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Pasco County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 26.7% |
| 2015 | 5.6% |
| 2016 | 12.2% |
| 2017 | 2.5% |
| 2018 | 0.0% |
| 2019 | 2.8% |
| 2020 | 63.4% |
| 2021 | 0.0% |
| 2022 | 0.8% |
| 2023 | 0.6% |
2023: 0.6%. Across these years the share ran from 0.0% to 63.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 164 tests reported to CDC for Pasco 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).
Pasco County, Compared
Pasco County radon figures, compared
Calculated by Radon411Only 1 of 164 radon tests reported for Pasco County in 2023 reached 4 pCi/L (0.6%). 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 4.4 pCi/L.
Across 49 Florida counties pooled together, 18.5% of tests reached that level, so Pasco County runs 17.9 points below its state. Against the national pool of 33.4%, the gap is 32.8 points lower. Its place in the state: 22nd of 30 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 0.6% 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 5.9% (Pinellas County) to 11.0% (Polk County).
Below the action level, 143 tests (87.2%) came in under 2 pCi/L, against 57.3% statewide, and 20 tests (12.2%) fell between 2 and 4, against 24.2% statewide. Over 10 years of annual figures the share fell 26.1 points, from 26.7% in 2014 to 0.6% in 2023; its peak was 63.4% in 2020. USGS geology rates 76% of the county's land low radon potential.
The busiest year on file was 2022, with 381 tests reported; the quietest, 2014, had 30.
Pasco CountyFlorida, pooled
0.6% % of tests18.5% % of tests
| Year | Tests | Pasco County, at or above 4 pCi/L | Florida, pooled |
|---|---|---|---|
| 2014 | 30 | 26.7% | 25.7% |
| 2015 | 54 | 5.6% | 26.5% |
| 2016 | 82 | 12.2% | 24.3% |
| 2017 | 40 | 2.5% | 21.7% |
| 2018 | 43 | 0.0% | 23.5% |
| 2019 | 36 | 2.8% | 29.6% |
| 2020 | 71 | 63.4% | 23.2% |
| 2021 | 36 | 0.0% | 15.4% |
| 2022 | 381 | 0.8% | 22.8% |
| 2023 | 164 | 0.6% | 18.5% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Pasco County, Geology
The ground under Pasco County
PredictedMost of the ground under Pasco County is one class on USGS's geologic map: 76.2% of its land is low radon potential, with 23.0% moderate. The map puts 76.2% of Pasco County in the area it calls Gulf/Atlantic Lowland and Central Highland and 23.0% 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 | 76.2% |
| Highland Anomalous areas | Phosphate deposits. | Moderate | 11 | 23.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Pasco County beside the ground around it
Pasco County has more moderate-potential ground than Florida as a whole: 23.0% of its land against 7.1%. Of the 5 counties that border it, 3 have more moderate-potential ground, Hillsborough County the most at 41.4%.
The map rates the ground, not the air in any home.
Local help
Pasco County, Local resources
Radon testing and mitigation in Pasco 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
Pasco County, Questions
Questions about radon in Pasco County
Are radon levels high in Pasco County?
In 2023, 0.6% of the radon tests reported to CDC for Pasco County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Of 30 Florida counties with 30 or more tests for the same period, 21 reported a higher share; pooled, the state comes to 18.5%.
Which counties border Pasco County?
Pasco County borders 5 counties: Hernando County, Sumter County, Hillsborough County, Pinellas County and Polk County.
Products
Pasco County, Products
Testing a home in Pasco County
In Pasco County, 0.6% of 164 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 Pasco 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
Pasco County, Bordering counties
Counties bordering Pasco County
Calculated by Radon411- Radon levels in Polk CountyEPA zone 2
11.0%at or above 4 pCi/L
Median 1.1 pCi/L · 136 tests · 10.4 points above Pasco County
- Radon levels in Hillsborough CountyEPA zone 2
7.5%at or above 4 pCi/L
Median 0.9 pCi/L · 984 tests · 6.9 points above Pasco County
- Radon levels in Pinellas CountyEPA zone 3
5.9%at or above 4 pCi/L
Median 1.2 pCi/L · 559 tests · 5.3 points above Pasco County
- Radon levels in Hernando CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 5 tests · 0.6 points below Pasco County
- Radon levels in Sumter CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 12 tests · 0.6 points below Pasco County
Pasco County, Cities and towns
Cities and towns in Pasco County
Pasco County is growing: the Census Bureau puts it at 674,516 residents on July 1, 2025, up 19.1% from 566,170 in 2020. That works out to 903 people per square mile of land. No town dominates: Zephyrhills, the largest, has 22,447 residents, 3.3% of the total. Together its 6 incorporated places hold 8.7% of those residents; the other 91.3% live outside any of them. Reported testing is thin here: 164 tests over 2023, or 0.2 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 0.7.
From Zephyrhills to San Antonio, CDC publishes no figure by town: each reads Pasco County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Zephyrhills | 22,447 | +29.5% | 3.3% |
| New Port Richey | 18,299 | +9.0% | 2.7% |
| Dade City | 10,173 | +40.7% | 1.5% |
| Port Richey | 3,655 | +18.5% | 0.5% |
| St. Leo | 2,468 | +0.1% | 0.4% |
| San Antonio | 1,603 | +23.2% | 0.2% |
6 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).
Pasco County, Homes
Homes in Pasco County
Of Pasco County's 265,118 homes, 64% are detached houses, against 55% across Florida; 18% are mobile homes. Half of its homes were built before 1991, close to Florida's 1988: 3% date from before 1960 and 36% from 2000 or later. Owners live in 76% of the occupied homes (Florida: 67%), so for most households a test and a fix are their own to order.
| Homes | Pasco County | Florida |
|---|---|---|
| Housing units | 265,118 | 10,082,356 |
| Detached houses | 64% | 55% |
| In buildings of 5 or more | 9% | 25% |
| Mobile homes | 18% | 8% |
| Built before 1960 | 3% | 10% |
| Built since 2000 | 36% | 30% |
| Middle year built | 1991 | 1988 |
| Owner-occupied | 76% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.