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 Miami-Dade County, Florida
EPA puts Miami-Dade County in Zone 2, its middle radon zone, and 39.6% of its 1,919 reported radon tests (2023) were at or above 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
39.6%
21.1 pts above FL
- Miami-Dade
- 39.6%
- Florida
- 18.5%
1,919 tests, 2023
Median result
2.8pCi/L
Below action level
- Miami-Dade
- 2.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
1,919
2nd of 30 by tests
- Miami-Dade
- 1,919
- Broward
- 2,165
Reported to CDC before any fix, 2023
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Florida
3 of 30
Top quarter
- Miami-Dade
- 39.6%
- Marion
- 44.5%
By share, of 30 with 30+ tests
Read a result for Miami-Dade County
Starts at Miami-Dade County's median, 2.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.8 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Miami-Dade County's median reported result, 2023.
The data
Miami-Dade County, At a glance
Miami-Dade County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Miami-Dade County is a
USGS geologic potential: Low across 80% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Miami-Dade County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 21.7% |
| 2015 | 36.2% |
| 2016 | 43.8% |
| 2017 | 21.8% |
| 2018 | 35.8% |
| 2019 | 61.1% |
| 2020 | 24.7% |
| 2021 | 13.2% |
| 2022 | 15.9% |
| 2023 | 39.6% |
2023: 39.6%. Across these years the share ran from 13.2% to 61.1%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 1,919 tests reported to CDC for Miami-Dade 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).
Miami-Dade County, Compared
Miami-Dade County radon figures, compared
Calculated by Radon411In Miami-Dade County, about 4 in 10 reported tests in 2023 (759 of 1,919) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 6.2 points higher. Across 49 Florida counties pooled together, 18.5% of tests reached that level, so Miami-Dade County runs 21.1 points above its state.
Of 2 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 9.4% (Broward County) to 22.7% (Collier County). By share, Miami-Dade County is 3rd of 30 Florida counties with 30 or more tests for the same period.
Year by year, 2014 opened at 21.7% and 2023 closed at 39.6% (up 17.9 points), with 2019 the high at 61.1%. Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 49.0 pCi/L. Below the action level, 755 tests (39.3%) came in under 2 pCi/L, against 57.3% statewide, and 405 tests (21.1%) fell between 2 and 4, against 24.2% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 39.6% share point the same way here. USGS geology rates 80% of the county's land low radon potential. CDC also counts 154 tests taken after mitigation in Miami-Dade County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2022, with 9,033 tests reported; the quietest, 2017, had 390.
Miami-Dade CountyFlorida, pooled
39.6% % of tests18.5% % of tests
| Year | Tests | Miami-Dade County, at or above 4 pCi/L | Florida, pooled |
|---|---|---|---|
| 2014 | 608 | 21.7% | 25.7% |
| 2015 | 661 | 36.2% | 26.5% |
| 2016 | 592 | 43.8% | 24.3% |
| 2017 | 390 | 21.8% | 21.7% |
| 2018 | 794 | 35.8% | 23.5% |
| 2019 | 1,352 | 61.1% | 29.6% |
| 2020 | 932 | 24.7% | 23.2% |
| 2021 | 1,000 | 13.2% | 15.4% |
| 2022 | 9,033 | 15.9% | 22.8% |
| 2023 | 1,919 | 39.6% | 18.5% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Miami-Dade County, Geology
The ground under Miami-Dade County
PredictedMost of the ground under Miami-Dade County is one class on USGS's geologic map: 79.5% of its land is low radon potential, with 17.5% moderate. The map puts 79.5% of Miami-Dade County in the area it calls Gulf/Atlantic Lowland and Central Highland and 17.5% in Dade County. USGS gives the first a radon index of 6, in the low band (5 to 8), and the second 9, 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 | 79.5% |
| Dade County | Limestone exhibiting a locally anomalous gamma radioactivity signature. | Moderate | 9 | 17.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Miami-Dade County beside the ground around it
Miami-Dade County has more moderate-potential ground than Florida as a whole: 17.5% of its land against 7.1%. None of the 3 counties that border it has any moderate-potential ground.
The map rates the ground, not the air in any home.
Local help
Miami-Dade County, Local resources
Radon testing and mitigation in Miami-Dade County
Listed radon businesses with an address in Miami-Dade 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: Miami, Hialeah, Coral Gables
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
Miami-Dade County, Questions
Questions about radon in Miami-Dade County
Are radon levels high in Miami-Dade County?
In 2023, 39.6% of the radon tests reported to CDC for Miami-Dade County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 30 Florida counties with 30 or more tests for the same period, 2 reported a higher share; pooled, the state comes to 18.5%.
Which counties border Miami-Dade County?
Miami-Dade County borders 3 counties: Broward County, Collier County and Monroe County.
Products
Miami-Dade County, Products
Testing a home in Miami-Dade County
In Miami-Dade County, 39.6% of 1,919 tests reported to CDC in 2023 reached 4 pCi/L, against 18.5% pooled across Florida. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Miami-Dade County; a long-term test tells the year-round average.
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
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Miami-Dade County, Bordering counties
Counties bordering Miami-Dade County
Calculated by Radon411- Radon levels in Collier CountyEPA zone 3
22.7%at or above 4 pCi/L
Median 2.3 pCi/L · 1,607 tests · 16.9 points below Miami-Dade County
- Radon levels in Monroe CountyEPA zone 3
12.5%at or above 4 pCi/L
Median 0.9 pCi/L · 8 tests · 27.1 points below Miami-Dade County
- Radon levels in Broward CountyEPA zone 3
9.4%at or above 4 pCi/L
Median 1.7 pCi/L · 2,165 tests · 30.2 points below Miami-Dade County
Miami-Dade County, Cities and towns
Cities and towns in Miami-Dade County
The Census Bureau estimates 2,802,029 residents in Miami-Dade County for July 1, 2025, 106,510 more than in 2020 (+4.0%). Packed into its land, that is 1,475 people per square mile. No town dominates: Miami, the largest, has 489,812 residents, 17.5% of the total. Together its 34 incorporated places hold 56.8% of those residents; the other 43.2% live outside any of them. CDC's 1,919 reported tests for 2023 work out to 0.7 per 1,000 residents (2025 estimate), close to Florida's 0.7.
From Miami to Indian Creek, CDC publishes no figure by town: each reads Miami-Dade County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Miami | 489,812 | +10.6% | 17.5% |
| Hialeah | 230,968 | +3.8% | 8.2% |
| Miami Gardens | 113,579 | +2.1% | 4.1% |
| Homestead | 86,242 | +7.1% | 3.1% |
| Doral | 81,634 | +7.1% | 2.9% |
| Miami Beach | 81,594 | −1.1% | 2.9% |
| North Miami | 60,884 | +1.8% | 2.2% |
| Coral Gables | 49,578 | −0.3% | 1.8% |
| North Miami Beach | 46,236 | +6.4% | 1.7% |
| Cutler Bay | 44,750 | −1.0% | 1.6% |
| Aventura | 39,880 | −0.4% | 1.4% |
| Miami Lakes | 33,067 | +8.7% | 1.2% |
Places in Miami-Dade County with a city page: 1 of 1
- Palmetto Bay
- Hialeah Gardens
- Sunny Isles Beach
- Sweetwater
- Pinecrest
- Opa-locka
- Key Biscayne
- South Miami
- Miami Springs
- Florida City
- Miami Shores
- North Bay Village
- West Miami
- Bay Harbor Islands
- Surfside
- Biscayne Park
- Bal Harbour
- Virginia Gardens
- El Portal
- Medley
- Golden Beach
- Indian Creek
34 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).
Miami-Dade County, Homes
Homes in Miami-Dade County
Miami-Dade County has 1,085,414 homes, and many share a building: 44% are in buildings of five or more, 39% are detached houses, against 55% across Florida. The homes are older than Florida's as a whole: half were built before 1980 (1988 for Florida), and 21% date from before 1960. 52% 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 | Miami-Dade County | Florida |
|---|---|---|
| Housing units | 1,085,414 | 10,082,356 |
| Detached houses | 39% | 55% |
| In buildings of 5 or more | 44% | 25% |
| Mobile homes | 1% | 8% |
| Built before 1960 | 21% | 10% |
| Built since 2000 | 23% | 30% |
| Middle year built | 1980 | 1988 |
| Owner-occupied | 52% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.