Water is the decision that gets one line on the listing sheet and then quietly outranks everything you actually planned to think about. Pick the wrong source and you don’t find out at the quote stage; you find out in the driest week of the year, with a foundation already poured.
Ten plain questions about your land, your household and your appetite for hauling. No geology homework. At the end you get a named source, why it fits what you told us, what tends to bite the people who choose it, and your first three moves.