Being 3rd world and the quality of the water do not necessarily go together. What counts is what’s underground and what the population ends up drinking.
I’m sure there was a time, perhaps over a hundred years ago when the US was developing at a rapid pace and not caring much about what was dumped in the soil, that the quality of its drinking water was much worse than in most other parts of the world. Today, however, the situation may be the same in what might be described as developing countries.
As for South America, I lived there for close to twenty-five years and drank more than a couple of sips of water. Currently, I’m in touch with a chemical engineer who is doing first-hand studies on the quality of drinking water down there, and whose pet peeve is the effort by local authorities to fudge on the so-called safety levels of harmful substances in the water supply.
I have to point out, though, that I came upon that paper while researching water filtration methods, and the prospects are encouraging.


