What EPA's radon map says about Osceola County

EPA's own radon map rates Osceola County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Osceola County in the 31st percentile nationally for radon potential — higher than 31% of the counties EPA has rated.

Osceola County by the numbers

About 468,058 people live in Osceola County, Florida, spread over 1,327.455 square miles. Averaged across its land area, Osceola County runs about 353 people per square mile. Among counties sharing Osceola County's EPA zone, it outranks 95% of them by population. EPA's geology-based Region 4 groups Osceola County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Osceola County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Osceola County — EPA's guidance to test every home makes no exception for counties predicted low.

If Osceola County tests above the action level

Mitigation cost doesn't depend on Osceola County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Florida's state radon program

Osceola County's test kit answers today; a Airthings radon monitor keeps answering for Osceola County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Osceola County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Osceola County carries, the zone explainer covers what it does and doesn't tell you about any one house.