Here is a link to a thread that was done by a man down in Las Vegas, Nevada. He set up a grey water system and using that and lots of mulch was able to grow an orchard in the Nevada desert and he even has worms now! That might not sound like much to you people back east but to get worms here is practically a miracle! I asked him and he did not import them. They just showed up.
https://www.backyardchickens.com/t/674812/my-greywater-orchard-irrigation-project/20#post_9366682
https://www.backyardchickens.com/t/674812/my-greywater-orchard-irrigation-project/20#post_9366682