I answered this in other comments: First tap water is potentially illegal to dump on its own, for example because of fluorine/chlorine (heated water is also pot

I answered this in other comments: First tap water is potentially illegal to dump on its own, for example because of fluorine/chlorine (heated water is also potentially illegal to dump). Second it is not tap water it is water that has gone through an industrial process, which can add toxins to the water. Third, you need to go through the permitting process before dumping to show that the water is in fact not contaminated because you can't unscramble an egg. You don't get to say "trust me bro", for good reason.