Dan,
You reminded of a situation a friend of mine back in California had to deal with. Crow Canyon is an area in the East Bay Area hills that sort of devides the bay from the valley. He lives on a few acres and had a well for water. A new development was built in the area and he was given told that he could get a water tap and meter for $30,000 at his house. He declined since it was so much money and is well worked just fine.
A year or so later, he was forced to pay for a water tap and meter because of some law that was passed. I left before it was all finalized, but the price had gone up and he said they were making all the existing home owners in the area pay for the line to the new development. He wasn't happy about it and the homeowners in the area had hired a lawfirm to fight it. I don't know what the final outcome was.
Eddie