What EPA's radon map says about Palm Beach County

EPA places Palm Beach County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Palm Beach County in the 32nd percentile nationally for radon potential — higher than 32% of the counties EPA has rated.

Where Palm Beach County sits nationally

About 1,582,055 people live in Palm Beach County, Florida, spread over 1,964.32 square miles. Population density there runs about 805 people per square mile. Among counties sharing Palm Beach County's EPA zone, it outranks 99% of them by population. Palm Beach 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 Palm Beach County

A Zone 3 county like Palm Beach County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Palm Beach County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Palm Beach County tests above the action level

Mitigation cost doesn't depend on Palm Beach 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

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

The methodology guide shows exactly which EPA and Census sources feed Palm Beach County's numbers. Whatever zone Palm Beach County carries, the zone explainer covers what it does and doesn't tell you about any one house.