Would it be weird at all if i asked my friend to wash her hands when she gets to work?

Well she’s more of my sisters friend but we are still friends. Anyways, I live with my mom and our well water currently has coliform in it. I still wash my hands in it but I wash my hands when I get to the store and work so im not spreading the coliform around. My friend is renting a room from us and she will be using the water too. She works at FedEx as a package handler and I dont want her getting the coliform all over the packages. Would it be weird if I asked her to make sure she washes her hands when she gets to work?