I've heard it used mostly in southeastern New Hampshire and eastern Massachusetts and Rhode Island. I always thought it might have been a Boston-influenced type of thing. I'm surprised to hear that it is used elsewhere in the country!
Anyways, I'm more of a western New-Englander when it comes to my speech. I call it a water fountain. However, I still use the word "wicked" somewhat frequently...
although I think I started using that word after I met my stepmom, who is... surprise! - from southeastern New Hampshire.