my area of NE FL is 100% chance, go deep enough and you will hit water. usually 2-3 different zones here you can pull from. we normally get wells from 40-160' (rock well), 200-380' (intermediate well- "salt&pepper"), 480-700' (artesian) .. just depends on what type of water they want and how much they wanna spend. but just because there is an abundance of water doesnt mean NE FL drilling is easy, we have to fight with "cave-ins", sand, bad clay, shell, gravel, etc.. .. on top of the fact that we are mostly low-land, so its always muddy and nasty, and hot.
here most close neighbors will have same well depths within 10' or so. although there are those few places we have drilled wells within 50' and they be totally different in terms of rock formations and well volume. i've even drilled a 100' rock well at one house, then there be no rock at his neighbors and have to go 260' to get to the next zone. can sometimes vary alot in a short distance.. the key is knowing where these uncertain areas are.
thats what makes well drilling so unique.. changes so much from area to area. any pinhead can work hard and operate equipment, but if you dont have enough experience to know what to expect here and there within your area, and how to prepare for it, you will have a very tough road as a new well driller starting out. running the equipment is the easy part.
a pvc well here that is drilled correctly "should" be the last well you ever need..