What EPA's radon map says about Pinellas County

EPA's own radon map rates Pinellas County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Pinellas County in the 32nd percentile nationally for radon potential — higher than 32% of the counties EPA has rated.

Pinellas County by the numbers

About 965,870 people live in Pinellas County, Florida, spread over 273.793 square miles. Population density there runs about 3,528 people per square mile. Among counties sharing Pinellas County's EPA zone, it outranks 97% of them by population. EPA's geology-based Region 4 groups Pinellas County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Pinellas County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Don't read Zone 3 as a pass for Pinellas County — EPA's guidance to test every home makes no exception for counties predicted low.

If Pinellas County tests above the action level

Mitigation cost doesn't depend on Pinellas 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.