nothing new here
Many years ago (approx 1968/69) I went on a visit with my school to the local sewage works (they did those sort of things back then). At the end of the trip we all stood around the water outfall from the plant. The Chief Chemist took a glass and filled if from the outfall. Then he drank it.
Only one of the class took up his offer to do the same. Ironically, that person went on to get a Phd in Chemistry.