My parents are in the same situation. Their house in the valley with a spring up on the mountian south of their house. My uncle wanted a house there too so he asked my grandfather about splitting water rights and he agreed so my parents had to let them hook up to their spring and holding tank. every summer we would run out of water watching them fill their pools or kids running through sprinklers, water slides or whatever. Then their kids grew up and one pulled a trailer in and hooked it up too so mow my parnets have a pump in the creek for washing and buy botteled water for drinking as there is never any water in the spring. My parnets do all the maintenance on the spring and tank and never get help from the uncle. Once they are gone and I inherit the land I don't know what I'm going to do with it. i'd sell the house and south side of the farm since its just some trees and nothing really there but would run into the issue of showing a good water supply as well.