What EPA's radon map says about Gulf County

Gulf County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Gulf County ranks higher in radon potential than 11% of rated counties (the 11th percentile).

How Gulf County compares

About 15,876 people live in Gulf County, Florida, spread over 553.467 square miles. That works out to roughly 29 people per square mile. Among counties sharing Gulf County's EPA zone, it outranks 33% of them by population. Geologically, Gulf County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

At Zone 3, Gulf County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 rating means Gulf County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Gulf County

Mitigation cost doesn't depend on Gulf 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

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

More on how this number was built

Gulf County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.