Is Polk County, FL a radon risk area?

EPA places Polk County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 65th percentile for radon potential — Polk County outranks 65% of every county EPA has rated.

Where Polk County sits nationally

About 852,878 people live in Polk County, Florida, spread over 1,798.466 square miles. Population density there runs about 474 people per square mile. Rank 25 by population within its EPA zone puts Polk County at the 98th percentile among zone peers. Geologically, Polk County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

Polk County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Polk County — testing is the only way to know an individual home's actual level.

Next steps for a home in Polk County

Nothing about Polk 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

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

Polk 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.