No Christa it is not dumb. He has not stated where or what kind of water he is using. But chlorine levels in tap water do not get anywhere high enough to kill that quickly. Chlorine also dissipates quickly. So maybe then chloramine ? If so levels would have to way above stds to kill that fast. With that being said no, he is running carbon, which removes chlorine and chloramine.
Something else in the tap water doing that would be considered toxic to humans. Well water for non-human consumption, never seen but possible. Some water from a run-off ditch yes.