There is at least one spring still in use in Milwaukee, the Bay View Iron Well, which I used to drink from copiously. It always seemed ancient and pure and mysterious, even though everyone knows about it. If anyone knows about this Sterling Spring Water Company, though, please post a comment about it.
Here is a photo of that area now, where 115th street crosses over Underwood Creek, courtesy of Google Street View. It is interesting to note that the watershed divides just west of there, at approximately 124th street. Is there still a spring there? Is it safe to drink from?