That's petty scary really.
Not just for the fact that it is Prozac, all the arguments against Anti-depressants deserves its own thread, but the fact that a drug could build up to such levels in the water supplies.
NZ is smaller than the British Isles, but there's still the possibility that the water that we all drink has dodgy levels of dodgy substances in it, all without our knowledge.
It's not like the Prozac has suddenly appeared there, it's just that now the levels are alarming enough to bother telling the public about.