Is Calhoun County, FL a radon risk area?

Calhoun County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 9th percentile for radon potential — Calhoun County outranks 9% of every county EPA has rated.

Calhoun County by the numbers

About 13,278 people live in Calhoun County, Florida, spread over 567.336 square miles. Averaged across its land area, Calhoun County runs about 23 people per square mile. Rank 747 by population within its EPA zone puts Calhoun County at the 28th percentile among zone peers. EPA's geology-based Region 4 groups Calhoun County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Calhoun County

Calhoun County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Calhoun County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Calhoun County

Nothing about Calhoun County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Florida's state radon program

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Calhoun County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.