Boiling water?

I was told yesterday that I need to be boiling the water before I mix it with the formula. I was told this at the WIC office but my Dr didn't tell us this when we talked about bottle feeding. My baby is 2 weeks old and I've seen the Dr twice since she was born and she never told me. The lady at the WIC office has me worried now! She told me if I don't it will make my daughter sick. Has anyone else been told this?