Is Highlands County, FL a radon risk area?

EPA's own radon map rates Highlands County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 26th percentile for radon potential — Highlands County outranks 26% of every county EPA has rated.

How Highlands County compares

About 109,778 people live in Highlands County, Florida, spread over 1,017.67 square miles. That works out to roughly 108 people per square mile. Rank 207 by population within its EPA zone puts Highlands County at the 80th percentile among zone peers. EPA's geology-based Region 4 groups Highlands County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Highlands County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Highlands County testing above the action level often enough that skipping a test isn't the safe assumption.

If Highlands County tests above the action level

Nothing about Highlands 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

Highlands County's test kit answers today; a Airthings radon monitor keeps answering for Highlands 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

Highlands County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.