I have a 600' well, had we known that we'd have to go that deep we would have looked more closely at rain water catchment. The issue with rain water catchment is drought. Around here there really isn't the delivery infrastructure to get water delivered, that means I would have to massively upsize my holding capacity. At minimum I would need a 10,000 gallon holding tank, and likely more than that. a 10,000 gallon tank is going to run around $7-8K installed plus pumping expenses (similar to a well) with the addition of water treatment for biologicals that just isn't needed with most wells, and an additional treated water holding tank. Add more storage capacity and the price only rises. There is a pretty decent way to see if rain catchment is an economical choice, look around and see if there are any installed in your area. There tend to be pretty good reasons why one method is preferred in an area vs. other options.
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