Locations and reports
Radon Levels in Orange County, Florida
What this means for you
- Your area: EPA rates Orange County Zone 3, the lowest of its three radon zones. That is a prediction for the whole county, and homes with elevated levels occur in all three zones.
- Local tests: Of 1,107 radon tests reported to CDC for Orange County (2023), 9.5% were at or above 4 pCi/L, EPA's action level.
- Your home: The only way to know your home’s level is to test it.
pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.
In 2023, 9.5% of the radon tests reported to CDC for Orange County, Florida came back at or above the EPA action level of 4 pCi/L, and the median result was 0.9 pCi/L. EPA's Map of Radon Zones places the county in Zone 3, lower predicted potential. Radon levels vary from home to home, so only a test measures the level in yours.
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
EPA predicts an average indoor of less than 2 pCi/L (less than 75 Bq/m³) across the county as a whole.
This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.
USGS geologic potential: High across 100% of the county's land area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Orange County, 2023
- Tests reported
- 1,107
- At or above 4 pCi/L
- 9.5%
- Median result
- 0.9 pCi/L
Of 1,107 pre-mitigation tests reported to CDC, not homes in this area. CDC publishes the share in each band, not a count per band, so the per-band counts in the table are calculated by Radon411 and rounded to add up to the published total.
| Result band | Tests Calculated by Radon411 | Share Measured |
|---|---|---|
| Under 2 pCi/L | 871 | 78.7% |
| 2 to 4 pCi/L | 131 | 11.8% |
| 4 pCi/L and above | 105 | 9.5% |
Distribution of tested buildings, not this house. People testing before a sale, or because they suspect a problem, are over-represented in any reported testing data.
Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Orange County, In figures
Orange County in figures
What the published data says about Orange County, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places Orange County in Zone 3, lower predicted potential, as it does 57 other counties of Florida's 67.
Of the 6 bordering counties, EPA places Polk County in Zone 2 and Brevard County, Lake County, Osceola County, Seminole County and Volusia County in Zone 3.
Reported tests
MeasuredCDC has annual figures for Orange County for 10 years, 2014 to 2023. In 2023, 9.5% of 1,107 reported tests were at or above 4 pCi/L.
Across those years the share ranged from 0.7% (2021) to 23.3% (2018). Few tests in a year can move it a long way.
Local record
Florida's radon program is the Florida’s Radon Program, run by Florida Department of Health; its contacts are under Local resources.
The county's largest incorporated places are Orlando, Apopka and Ocoee; the figures here cover them as part of the county.
Orange County, Reported testing
Reported testing over time
Measured| Year | Median reported result | Highest reported result | Share of tests at or above 4 pCi/L |
|---|---|---|---|
| 2014 | 0.8 pCi/L | 11.8 pCi/L | 4.1% |
| 2015 | 0.9 pCi/L | 10.3 pCi/L | 4.4% |
| 2016 | 0.9 pCi/L | 9.7 pCi/L | 1.9% |
| 2017 | 0.9 pCi/L | 54.0 pCi/L | 5.6% |
| 2018 | 2.5 pCi/L | 53.0 pCi/L | 23.3% |
| 2019 | 0.6 pCi/L | 9.9 pCi/L | 2.6% |
| 2020 | 0.9 pCi/L | 13.7 pCi/L | 2.9% |
| 2021 | 1.0 pCi/L | 4.8 pCi/L | 0.7% |
| 2022 | 1.0 pCi/L | 14.6 pCi/L | 7.1% |
| 2023 | 0.9 pCi/L | 10.4 pCi/L | 9.5% |
What these figures count
Every percentage here is a share of radon tests reported to CDC for Orange County in 2023. It is not a share of homes in Orange County, and it is not a random sample: it counts only the tests people chose to run and that were reported.
The shares and the median are calculated from pre-mitigation tests (1,107 for 2023). CDC also reports the number of buildings tested (1,015), a different count, so the two totals are not interchangeable.
Orange County, Comparison
How Orange County compares
MeasuredOrange County's own published CDC figures beside those of the counties that border it, for the same period.
Share of reported tests at or above 4 pCi/L
Measured2023, highest first. Each county’s own published CDC figure.
- Polk CountyFL136 tests11.0%
- Orange CountyThis page1,107 tests9.5%
- Seminole CountyFL190 tests1.6%
- Osceola CountyFL70 tests1.4%
- Volusia CountyFL163 tests1.2%
Published for 2023 without this measure: Lake County, FL; Brevard County, FL.
Median reported result
Measured2023, highest first. Each county’s own published CDC figure.
- Osceola CountyFL70 tests1.2 pCi/L
- Polk CountyFL136 tests1.1 pCi/L
- Orange CountyThis page1,107 tests0.9 pCi/L
- Brevard CountyFLTest count not published0.7 pCi/L
- Lake CountyFLTest count not published0.6 pCi/L
- Seminole CountyFL190 tests0.6 pCi/L
- Volusia CountyFL163 tests0.6 pCi/L
Each figure is that county’s own published CDC figure for 2023, counting radon tests reported to CDC, not homes. Orange County is this page. Nothing is averaged or combined across counties. The test count beside each county is CDC’s published number of pre-mitigation tests behind its figures. Figures from few tests can swing widely from year to year. Every Florida county’s own figure is in the Florida county table.
CDC publishes this figure only for counties here, so there is no state or national number to compare Orange County, Florida with.
Orange County, Bordering counties
Counties bordering Orange County
Calculated by Radon4116 counties share a boundary with Orange County, computed from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county’s report can be worth reading alongside this one.
Orange County, Local resources
Local resources in Florida
Who to ask in Florida: the state's radon program, test kits and professionals.
Florida’s Radon Program
Florida Department of Health
Florida’s radon program answers questions about testing, mitigation and the rules where you live.
- 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.
Test kits
The program says: Protect your family by requesting a FREE radon test kit.
Radon professionals
5 professionals are listed in Florida.
Professionals in FloridaOrange County, Cities and towns
Cities and towns in Orange County
The radon figures on this page are for Orange County as a whole. They do not differ by city or town.
- Orlando
- Apopka
- Ocoee
- Winter Garden
- Winter Park
- Maitland
- Belle Isle
- Oakland
- Windermere
- Edgewood
- Eatonville
- Lake Buena Vista
- Bay Lake
13 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files.
Orange County, Questions
Questions about radon in Orange County
Common questions8 questions, answered from the figures above
How do I get a radon test in Orange County?
EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. No certified tester listed on Radon411 names Orange County as a service area yet. The Florida radon program is the place to ask about certified testers and any test kit offer it runs.
How to test a homeTest kits comparedFree and low-cost kits by stateFlorida radon program
Are radon levels high in Orange County?
In 2023, 9.5% of the radon tests reported to CDC for Orange County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. That is a share of reported tests, not of homes. EPA places Orange County in Zone 3, lower predicted potential, a predicted average indoor screening level less than 2 pCi/L. Homes with elevated levels occur in all three zones, so the figures describe the area, not your house. Testing is the only way to know the radon level in a specific building.
Who does radon mitigation in Orange County?
No listed mitigator names Orange County as a service area yet; the Florida directory lists 5 companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional. Your state radon program is the place to check whether Florida requires one.
How radon mitigation worksWhat mitigation costsMitigators in Florida
What EPA radon zone is Orange County in?
EPA places Orange County, Florida in Zone 3, which EPA describes as lower predicted potential for the area. A zone is a prediction for the whole county and never determines whether a particular home should be tested. EPA recommends testing every home regardless of zone.
Should I test my home in Orange County?
Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.
When is the best time of year to test?
EPA says short-term tests stay in the home from 2 to 90 days and that all radon tests should run a minimum of 48 hours; long-term tests stay more than 90 days. EPA's guides do not name a best season: they say radon levels tend to vary from day to day and season to season, so a long-term test is more likely than a short-term test to tell you the year-round average.
What does it cost to test?
EPA's Citizen's Guide calls testing easy and inexpensive, and EPA's Home Buyer's and Seller's Guide says passive short-term and long-term devices are generally inexpensive, while active devices may cost more. No national average price is published for this, so Radon411 does not give one. What testing costs.
Which counties border Orange County?
Orange County borders 6 counties, derived from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county's report can be relevant.
What these figures mean if you own, buy, sell or rent
The reported-test figures on this page describe Orange County, Florida in 2023. They describe tests other people carried out in other buildings, and none of them measures yours.
- How to test a home
If you own your home
Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.
- Buying a house: radon guide
If you are buying
Ask for past results and any system's post-mitigation test, and test during the sale.
- Selling a house: radon guide
If you are selling
Testing before you list puts the timing in your hands; disclosure rules differ by state.
- Radon in rental homes
If you rent, or rent out a home
A tenant can test; a fix is the owner's to make, and duties differ by state.
How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.
Orange County, Products
Testing and mitigation products
Whatever the figures for Orange County show, only a test tells you about one home.
Testing
- Short-term test kitsPassive detectors exposed for a few days under closed-building conditions, then analyzed by a lab.
- Long-term test kitsDetectors exposed for more than 90 days, for a closer picture of the annual average.
- Continuous monitorsPowered devices that log radon on a repeating cycle, often used for transaction tests.
- Digital detectorsConsumer devices that display a running radon reading without a lab.
- Water radon testsKits for radon dissolved in well water, analyzed by a lab.
Mitigation
- Mitigation fansThe inline fan that keeps a soil depressurization system running, sized by the installer.
- System indicatorsU-tube manometers and fan alarms that show whether a mitigation system is still working.
- Sealing materialsCrack, joint and sump sealing used alongside a mitigation system, not instead of one.
Orange County / Next steps
What to do next
Learn
Know what radon is
What radon is, how it gets indoors, and why a county zone is not a reading for your home.
Learn about radonTest
Test the building you live in
Short-term or long-term, where the device goes, and closed-house conditions.
How to testFix
Bring a high level down
How a mitigation system works, and the retest that confirms it.
How mitigation worksFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.
Find a professional
Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.