You’re going to see a map of older areas, that is, urban cores and inner-ring suburbs. In other words, I don’t think you’re going to find the correlation you’re probably hoping for.

To be fair, though, the official government line – uh, until today, I guess – is that lead water mains weren’t actually a problem because of the large volume of water flowing through them relative to the rate of corrosion, unless you did something stupid (like the Republican governor-appointed emergency manager did to Flint) to cause them to corrode abnormally rapidly. Hopefully there isn’t much of a widespread correlation between political affiliation and brain damage from exposure to lead via plumbing at all.