I don't know where you're getting this from. Generally speaking, regulations and enforcement are tighter than they've ever been. That doesn't mean they're perfect, but you're going to have to show some evidence it's getting worse.
I really don't think you want to go back to the 1970's and 1980's, or the 1940's and 1950's.
I mean, I totally believe you about your water -- I just don't know where you get the idea that it was better in the past. If anything, you as a consumer just didn't have the ability to detect it or filter.