Hi Everyone!

Whenever I run the washing machine or dishwasher, my entire house will reek of sewer gas for about 24 hours, or until I open all the windows up to allow the smell to dissipate. If I run the dishwasher and the washing machine the same night, the smell is extremely strong. The smell is so strong that it wakes me up frequently in the middle of the night. My bedroom is at the opposite end of the house, and I sleep with the door shut. You can smell the nastiness in the morning when you step outside the house.

I have also noticed when the washing machine is running, almost the entire sink basin in the garage backs up with dirty water, and then drains. Not sure if that's normal.

The layout of my house is classic ranch style (one long line); all the bedrooms at one end, then the kitchen, then laundry room, then garage.

I've reached out to several plumbers to come and inspect, and nobody can figure it out. It's gotten to a point where I want to just tear all the plumbing out and get new pipes (original plumbing from 1961, but pipes are still in "good condition", but every plumber says that may not even fix the problem.

I'm hoping someone here can give me some tips I could try myself, or even share with a plumber to look into.

Thank you!!

Water backing up in the garage sink is not normal. There is a restriction in the sewer pipe that needs to be cleaned and possibly checked with a camera. This is the first thing to do.

Simple first. Is there a floor drain near that section of the house? A dried out floor drain can cauce your issues. Or even a sink that doesnt get used (dried out trap).

Many years ago I had a similar problem in a building I managed. So we shut every door and sealed the doors with blue painters tape, then ran the washing machine. Then we opened one door at a time to find the source. When we found the room with the odor source, we stripped it bare. It turned out that there was a hidden floor drain that had dried out years ago that nobody knew about.