eli5: When people used wells for drinking water, how did they not get sick? Was there some type of filter or was the water just naturally clean?
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Humans have been purifying water for [1000s of years](https://www.lenntech.com/processes/disinfection/history/history-water-disinfection.htm. most contaminates have been diseases fromm humans or animals. Someone already mentioned cholera in another comment. Ex. If you have cholera and your human waste gets into the ground water, anyone who gets water from a nearby well could get cholera.
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