[Fomite]

I would be extremely suspicious of any method that found it free of bacteria. Tap water is not sterile (neither is bottled water).

Free of pathogens, maybe. Free of bacteria? Not even a little bit. Especially once it's traveled through household plumbing.

[gamblor956]

Tap water isn't guaranteed to be sterile, but it can be based on the condition of the water system and pipes.