Right, and the other side of that is that cities couldn't exist at all if we relied on well water alone. There isn't enough concentrated in one place, even if it were clean enough to avoid continuzous cholera outbreaks. Even in relatively wet parts of the country. New York for instance uses billions of gallons daily, piped in from upstate - and has had to for over a hundred years.
The point isn't that the area can't supply its own water, nor that upstate NY can't supply enough water for NYC. The point is that even in a water-rich region, a city like NYC (or even one the size of Albany) cannot support its population off well water. Thus the existence of modern economic centers is dependent on piping in water. Telling city dwellers that they should get their water from wells so as to avoid dependence on their neighbors for their water is an absurdity.
