The first line of attack with hard water is more soap. You might try soap sticks and face lathering. It's easier to get more soap involved that way. if you don't have something in stick form, just rub the puck right on your face (soften it with water first if it's a really hard soap). Some soaps contain EDTA, which helps with hard water by binding up the metal ions in the water. Arko has this, and I'm sure quite a few others do. Just check the label.
http://en.wikipedia.org/wiki/Edta
http://en.wikipedia.org/wiki/Edta