I'm sort of confused: you could have said the same thing about lead 70 years ago.
I guess your point is that we had better prove with absolute certainty that this is a problem before we try to do something about it, since it would be a bit expensive to rework the entire world's plumbing and pointless to target anything short of that.
You'd need to rework more than the worlds plumbing considering thats not even whats tainting things. The source says its often from runoff, from rain dissolving naturally occurring aluminum precipitated all over the earths crust and bringing it into the water supply. The only solution to that would be to distill all water. Imagine those energy costs.
My point is basically we are doomed for this, c'est la vie, live your life, probably something else will be taking you out at the end of the day anyhow.
