The claim I’m making isn’t that you can’t use non-potable water. It’s that the water quality is regulated (see https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFR...) and you can’t fertilize crops with raw human sewage (https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFR...), both of which are true (with certain exceptions).

I find it is useful to try to disprove your own beliefs before confidently claiming something to be true. The resources are out there and not terribly difficult to locate if you put a modicum of effort into it.

Many farmers in my state water from rivers on their land that aren't even large enough to get EPA attention let alone direct regulation. I think you're under the impression everyone with a vegetable stand is Cargill or something.