Superstition (1982) | HORROR/SLASHER | FULL MOVIE

A family moves into a long-condemned New England household with a big pond out back that everybody loves to swim in. Soon, however, they find that the pond was the site of the execution- by-drowning of a witch three hundred years before, and she's back to revenge herself on anybody nearby, whether they're Catholic or not.

IMDb: https://www.imdb.com/title/tt0084739