I have been told by some people that should know what they are talking about, here in Georgia that the State of Georgia Department of Natural Resources does not permit permanent moorings, of any kind, not even in designated anchorage areas! It is a regulation, not a law, and people who have looked into this have hit a stone bureaucratic stone wall. I need to investigate further myself.
It is kind of sad. Near where I live there is a designated ancharage area which is fairly large and is unused.
Where I used to keep boats, in Connecticut and Massachusetts, there was usually a harbor master and he told you where you could put your mooring, and might specify what it should be, usually a mushroom. Not here in the State of Georgia.
Forumites, what is the situation where you are?