As I recall, you need a certain type of rock for radon, had the problem back up north, house was on the 'reading prong', had to install a mitigation system, this was after 3 years prior tests that were OK. Anyway, Florida appears to sit on a lot of limestone (sinkholes...) and sand, neither of which are a source of radon.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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