I was reading a news story about a farmers irrigation system pumping the neighbors well's dry. One family has been without water for a good three weeks. The farmer basically told the family to live with it, because that is the way it is. This also happened 6 years ago with the same irrigation system. It is actually owned by a church and 6 years ago they shut the system down due to bad publicity. The corporate farmer leasing the property now, ain't gonna be so nice.
I look for this to become a very hot topic in the not too distant future. Unless of course you can prove that the aquifer you're pumping out of stops at your property line.