There's exactly one "communist" country on earth, which is North Korea. And that happens to be quite good on this metric. Whatever correlation you are imaginin

There's exactly one "communist" country on earth, which is North Korea. And that happens to be quite good on this metric. Whatever correlation you are imagining in South America is completely spurious, even with your litany of reasons to exclude anything that doesn't fit your worldview. Most every government on the continent has switched between left- or right-leaning governments at least once in the last decade, and I assure you tap water quality changes much slower. Brasil, for example, switched from Da Silva (left) to Bolsonaro (right) just a little more than a year ago. And, oh, look: the map's CDC data is from 2018: https://www.cdc.gov/healthywater/drinking/data/index.html https://www.cdc.gov/healthywater/drinking/data/index.html The Scandinavian countries that are frequently cited as examples any advanced nations' left strives to imitate are obviously killing it on drinking water quality, as well.