Our waterways are becoming more and more polluted due to PFAS, plastics, medicines, drugs, and new chemicals made by companies that just hand over the responsibility of cleaning to plants paid for by public moneys. Detecting the different chemicals and filtering them out if getting harder and harder. Could the simple solution of heating up past a point where even PFAS/forever chemicals decomposes (400C for PFAS, 500C to be more sure about other stuff) be alright?
Golly gee, if only there were some form of energy generation that required boiling vast amounts of water to turn into steam. But no, that would be silly.
You definitely wouldn’t want to drink the water from any of those systems you’re describing though :)