This article on 3 pages enumerates sacred springs and wells in Poland.
Ooops, it seems the link got deleted somehow and now when I want to bring it back, it says it doesn`t exist anymore. Strange. ?????
So, famous sacred springs one by one.
Wasilków - Holy Water Sanctuary, north east Poland
pl.wikipedia.org/wiki/Sanktuarium_Matki_Boskiej_Bolesnej_w_%C5%9Awi%C4%99tej_Wodzie_(Wasilk%C3%B3w)