Also, I have never met anyone that calls water fountains "bubblers". Never. Well, one, but she just did jokingly. Then again I'm in Madison, maybe it's different here.
Maybe it's more of a Milwaukee/eastern WI thing? I grew up near Milwaukee and it was always bubbler.
There is a specific reason this is said in parts of Wisconsin, at least:
"Bubbler is a trademarked name that refers to what some may call a drinking fountain."
http://en.wikipedia.org/wiki/Bubbler