Wouldn&#x27;t most tap water in the US fit under this definition?  My father used to work at a waste water treatment facility.  At one end of the plant was all of the raw sewage that came in from the city, at the other end, it had been cleaned and purified to the point you could swim in it and probably be OK drinking from it.  I know that from there they didn&#x27;t just dump the water back into the local rivers and ponds, it went back to the water treatment facility not too far away where it found its way back into homes.