Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Martin County, Florida
EPA puts Martin County in Zone 3, its lowest radon zone, and only 29 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
0.0%
22.8 pts below FL
- Martin
- 0.0%
- Florida
- 22.8%
1,284 tests, 2022
Median result
1.5pCi/L
Below action level
- Martin
- 1.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
1,284
13th of 40 by tests
- Martin
- 1,284
- 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
27 of 40
Middle half
- Martin
- 0.0%
- Palm Beach
- 54.7%
By share, of 40 with 30+ tests
Read a result for Martin County
Starts at Martin County's median, 1.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.5 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. Martin County's median reported result, 2022.
The data
Martin County, At a glance
Martin County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 97% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Martin County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 15.0% |
| 2016 | 38.9% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 8.3% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
| 2023 | 24.1% |
2023: 24.1%. Across these years the share ran from 0.0% to 38.9%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 29 tests were reported to CDC for Martin 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).
Martin County, Compared
Martin County radon figures, compared
Calculated by Radon411Only 0 of 1,284 radon tests reported for Martin County in 2022 reached 4 pCi/L (0.0%). The median result, 1.5 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 3.7 pCi/L.
The newest figure, in 2023, counts only 29 tests (24.1% at or above 4 pCi/L), too few to compare, so this reading uses the 1,284-test figure.
Across 54 Florida counties pooled together, 22.8% of tests reached that level, so Martin County runs 22.8 points below its state. Against the national pool of 23.9%, the gap is 23.9 points lower. Its place in the state: 27th 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 0.0% share point the same way here. Of 2 neighbours with a figure, all 2 reported a larger share at or above 4 pCi/L; the spread is 3.2% (St. Lucie County) to 54.7% (Palm Beach County).
Below the action level, 1,077 tests (83.9%) came in under 2 pCi/L, against 52.6% statewide, and 207 tests (16.1%) fell between 2 and 4, against 24.6% statewide. USGS geology rates 97% of the county's land low radon potential.
The busiest year on file was 2022, with 1,284 tests reported; the quietest, 2018, had 2.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Martin County, Geology
The ground under Martin County
PredictedUSGS's geologic map puts all of Martin County's mapped land in one class: low radon potential. 96.6% 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 | 96.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Martin County beside the ground around it
Across Florida 7.1% of the land is rated moderate; none of Martin County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Martin County, Local resources
Radon testing and mitigation in Martin 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
Martin County, Questions
Questions about radon in Martin County
Are radon levels high in Martin County?
In 2023, 24.1% of the radon tests reported to CDC for Martin County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 40 Florida counties with 30 or more tests for the same period, 26 reported a higher share; pooled, the state comes to 22.8%.
Which counties border Martin County?
Martin County borders 5 counties: St. Lucie County, Palm Beach County, Okeechobee County, Glades County and Hendry County.
Products
Martin County, Products
Testing a home in Martin County
In Martin County, 0.0% of 1,284 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 Martin 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
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- 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
Martin County, Bordering counties
Counties bordering Martin County
Calculated by Radon411- Radon levels in Palm Beach CountyEPA zone 3
54.7%at or above 4 pCi/L
Median 4.5 pCi/L · 5,412 tests · 54.7 points above Martin County
- Radon levels in St. Lucie CountyEPA zone 3
3.2%at or above 4 pCi/L
Median 1.2 pCi/L · 2,223 tests · 3.2 points above Martin County
- Radon levels in Hendry CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 2.6 pCi/L · 3 tests · 0.0 points above Martin County
- Radon levels in Okeechobee CountyEPA zone 3
No CDC figure for 2022; its page reads it against its own neighbours.
- Radon levels in Glades CountyEPA zone 3
No CDC figure for 2022; its page reads it against its own neighbours.
Martin County, Cities and towns
Cities and towns in Martin County
The Census Bureau estimates 166,272 residents in Martin County for July 1, 2025, 7,616 more than in 2020 (+4.8%). That works out to 306 people per square mile of land. No town dominates: Stuart, the largest, has 19,451 residents, 11.7% of the total. Together its 5 incorporated places hold 17.8% of those residents; the other 82.2% live outside any of them. Testing is reported here more often than across the state: CDC's 1,284 reported tests for 2022 come to 7.7 for every 1,000 residents (2025 estimate), against 2.6 for Florida.
From Stuart to Ocean Breeze, CDC publishes no figure by town: each reads Martin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Stuart | 19,451 | +11.2% | 11.7% |
| Indiantown | 6,826 | +4.1% | 4.1% |
| Sewall's Point | 2,078 | +4.2% | 1.2% |
| Jupiter Island | 841 | +4.0% | 0.5% |
| Ocean Breeze | 402 | +30.1% | 0.2% |
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).
Martin County, Homes
Homes in Martin County
Fewer than six in ten of Martin County's 82,297 homes are detached houses (54%, against 55% across Florida); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1986, close to Florida's 1988: 6% date from before 1960 and 23% from 2000 or later. Owners live in 80% of the occupied homes (Florida: 67%), so for most households a test and a fix are their own to order.
| Homes | Martin County | Florida |
|---|---|---|
| Housing units | 82,297 | 10,082,356 |
| Detached houses | 54% | 55% |
| In buildings of 5 or more | 21% | 25% |
| Mobile homes | 10% | 8% |
| Built before 1960 | 6% | 10% |
| Built since 2000 | 23% | 30% |
| Middle year built | 1986 | 1988 |
| Owner-occupied | 80% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.