The water that is used for residential irrigation is a combination of well water and the water that gets collected by the storm drains. It is NOT reclaimed water from the sanitary sewers (this water is reused, but only on the golf courses). However, even water that comes from the storm drains may have some stuff in it that you may not like, such as dog feces from dogs whose owners fail to pick up after their pet. Whether that makes it unsafe for fruit tree irrigation, I don't know. I tend to doubt it since the "bad" stuff would be highly diluted.
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