You can tell a little by the type of vegetation, if you have pine trees their roots are going to be pulling fresh or near fresh water. It also depends upon soils, so you really can't measure from MSL and actually know. You can take an auger or post hole digger and go down a few feet and see what you find, i.e. sand, wet sand, clay, much etc.
You also need to know if you are in a floodplain or wetland, each have restrictions on what you can and can't do plus requisite permitting.
Hell, there are full size pine trees on those itty bitty islands off Galvez Landing surrounded by salt water.
Anyways, fresh water floats on top of salt water.
Even if it is in the ground.
That's party island. Me and a old buddy used to throw keg parties out there almost 30yrs ago. His Dad owned a large piece of property on the canal and he had a well with fresh water. Saltwater wasn't a problem.
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