I've lived in several states and visited over 20. LA has the worst tap water, but most places are pretty good. Larger cities tend to taste worse than medium cities and rural places.

I think the biggest variable in ability to learn is the willingness to learn. I think we will still annoy the youngin's of tomorrow a little bit, human nature is to avoid some change, but I dont think millennials will be as bad as boomers because of lead exposure.