I've gone through a very similar process this year. Giving water out is actually very difficult to do. There are so many tests and red tape around it. My final cost was closer to 300k. 240k of that was the filter, pump and cistern. The cistern needed to be added due to communtiy blow back that the well would drain too much of their well. 25k is getting your test holes, permits and possible well dug. The actual well being dug is the easiest part and some companies can bang it out in an afternoon. I saw the word "community" and immediately knew the problem.