We bought a 96 year old house a few months ago. Every time the washing machine is emptying out water comes up in the kitchen sink and the bath tub with a strong sewage smell.
The sink in the bathroom also has a strong sewage smell every time you run the water in it.
There is a crawlspace underneath the house and we have public sewage.
My husband doesn't seem to be to worried about the smell, but it is really starting to bother me. What can we do to fix it?

Becky