Just thought of something else: where we live, the closest city is slowly creeping this way. Soon I expect them to take us into their ETJ. When they do, the only way you can get a permit to install a new well, septic tank or drainage field, is to agree to hook onto city water and sewage once it is available.
One thing the bastards neglect to tell you is that no one can hook onto city sewage & water without being annexed by the city.
So this means if your well or septic system fails, and you need a permit to repair/replace it, the city will not issue a permit unless you agree to their terms. They have you between a rock and a hard place because you are without working plumbing and most likely will agree to anything to make your house liveable again.
Bob