Just a note, if you have a septic tank please don't do this, it kills the bacteria that breaks down what comes into it.
Originally Posted by
sassey
this sounds crazy but I know of a lady that couldn't find the source of where her problem was it just smelled musty she poured bleach down every drain every day for about a week and the smell left now she flushes bleach about once a week to prevent it happening again. she could try this untill she can get it fixed if it is a leak
Since it is Phoenix in an ultra dry climate, has she had the swamp cooler/air conditioner serviced?
Otherwise I agree with the others water is leaking somewhere and needs to be stopped or dry rot will set in and it is like cancer, just keeps growing if the wood isn't replaced.