0tterbot wrote:

what pollutants are they?

mercury, cadium, PCB's etc



you have to keep in mind that all water is part of the precipitation cycle,
so all water is recycled. the water you drink tomorrow could have been peed
out by elvis ;-) any "pollutants" in your area which enter the
precipitation cycle (or others, elsewhere) are therefore going to be part of
that as well, so it seems odd to have one set of pollutants to be concerned
about which are solely associated with sewage (?)

evaporation usually cleans the water, althougb PCBs have made it ti the
artic by cycles of evaporation.