If someone uses the word "bubbler" instead of "water fountain" or "drinking fountain", they are likely from Milwaukee or at least Wisconsin. I say this as a Wisconsinite who knows that many people outside of the state have not heard this way of referring to a water fountain. "Water fountain" and "drinking fountain" also have regional differences, but they both have widespread use across the United States, so this wouldn't clue you into much. I've heard that Eastern Massachusetts also uses this terminology, but I have not been there so I cannot say from personal experience.
Along the same lines, if someone refers to a casserole as a "hot dish" (and especially if they have strong feelings about which term is correct) they are likely from Minnesota or North Dakota.
If someone uses the word "bubbler" instead of "water fountain" or "drinking fountain", they are likely from Milwaukee or at least Wisconsin. I say this as a Wisconsinite who knows that many people outside of the state have not heard this way of referring to a water fountain. "Water fountain" and "drinking fountain" also have regional differences, but they both have widespread use across the United States, so this wouldn't clue you into much. I've heard that Eastern Massachusetts also uses this terminology, but I have not been there so I cannot say from personal experience.
Along the same lines, if someone refers to a casserole as a "hot dish" (and especially if they have strong feelings about which term is correct) they are likely from Minnesota or North Dakota.