I have never seen EMT corrosion protection I "judged suitable for the condition." of being buried in Florida. I have dug up EMT that was in the ground less than 5 years and it was a rusty trail of sand with THWN in it.
The only reason you would know it was EMT was the zinc connectors. We do have pretty salty ground water tho, typically 5 PPT or so, west of 41.
