Reply #2: Why need a zip code?

[Nihil]

All you need to do is look at a map ... your waste goes through your
sewage farm and into the river to be extracted by the next community
downstream, fed through their water processing plant and into their tap.
Obviously, the same has happened to the next community upstream too but
it is *your* tap that is dispensing *their* ex-sewage.

In general, the people nearest to the rainfall get the cleanest water
while those closest to the sea get the most shit.

(I realise that this may not apply to some parts of the US, especially
those on the coast who simply dump their waste into the sea, but again,
you don't need a zip code to see this - just a boat trip ...)