Secondly, having clean drinking water is almost an entirely 20th century convention. For the longest time Western European states up until the mid 19th century "pissed and shit" in their water. They didn't have developed sewer systems and really didn't understand the need for sewer systems till the mid 19th century. So having clean drinking water is very much a new thing that we're very lucky to have. If not for technology we'd still be in the same boat.
Hell, how "civilized" are we? We're so ridiculously dependent upon modern technology. Without it, we'd be lost. For alot of people that's their ancestral lands, going to tell them to move is equivalent to me going to your home and saying leave even though you've been there for generations. Please, do some additional reading before spouting off.