Is St. Lucie County, FL a radon risk area?

EPA's own radon map rates St. Lucie County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and St. Lucie County lands in the 31st percentile for radon potential.

How St. Lucie County compares

About 390,670 people live in St. Lucie County, Florida, spread over 571.874 square miles. Population density there runs about 683 people per square mile. Rank 71 by population within its EPA zone puts St. Lucie County at the 93rd percentile among zone peers. St. Lucie County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in St. Lucie County

St. Lucie 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 St. Lucie County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in St. Lucie County

Nothing about St. Lucie 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

St. Lucie County's test kit answers today; a Airthings radon monitor keeps answering for St. Lucie 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone St. Lucie County carries, the zone explainer covers what it does and doesn't tell you about any one house.