I'm curious about this as well. We have it off and on in our 1976 house. We've had several suggestions given to us about what it might be (seem to match up to yours) but we've yet to find the solution.

Hello,
I have recently been having this problem as well. About two weeks ago the house started smelling like eggs to the point where you had to leave because it would give you a headache. Now this only happens when you run the washing machine for the first time after it sits for a day or so. Now the layout if the kitchen is next to the washroom so the drain goes from the kitchen sink to the washroom and down into the foundation of the home. By the way we live in Orange California and we have a public sewer hook up. And so far I have tried cleaning the garbage disposal, snaking the vent pipe above the kitchen (which was clogged) as well as the vent pipe above the washroom. Oh......and by the way, this started about the same time our kitchen sink clogged up. I snaked it clear BUT the wife dumped Drain-O down the pipe so?!?!

The only odd part is that the smell seems to roar out of the dining room which is in front of the kitchen and washroom. Oh please help me out with this! I am so stumped!!! And sick of the smell!!!

Anyone who installs an AAV should be sent to jail and not pass go

Depending on a piece of rubber and plastic to keep carcinogenic fumes from entering a structure takes a certain mind set.

Snaking is useless when it comes to cleaning a waste line fro a kitchen or laundry room as a snake will not scour the lines just bores a hole through soft stoppages (soap film and grease)

Water Jetting is the correct procedure

Also checking the fresh air inlet to make sure it is not blocked and the vent terminal

Ideally an oil of peppermint test or a smoke test can usually find a defect in a vent.. The usual approach is to check the traps , possibly use hydrogen peroxide down the drain to kill order forming bacteria which is a lot safer then bleach and unlike caustic chemicals will not damage the pipe

Do you have a burst sewage pipe near your house? That might explain why there is the smell during some months if the wind blows in a different direction. You might want to survey the area just in case. If the fault lies with your own home, then I am not sure how to help you. Maybe keeping the house well ventilated with air fresheners may help.

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This is really a major problem for your. I can understand how difficult it is to live in the house which is surrounded by sewage smell. I think that is because you might have your sewage tanks inside the house and they are full of waste. I advice you to call related associate to mend the problem that may be bursting of pipe and do not forget to make your sewage tank out of your home. You can find various Professional Cleaners that specialized in sewage cleaning. They can better advice you and can solve your problem.

Was this problem ever solved and if so what was the solution? We are having the same problem...

We had this same problem in our newly flipped house and had a plumber come to take a look. He determined that the issue was in the upstairs bathroom. The flange for the toilet was installed before the tile was laid, which created a small gap between the flange and the toilet itself that allowed air to escape depending on the air pressure that day. It never seemed to be coming from the bathroom b/c the smell would sink and pool down around the bottom of the staircase throughout the day. He added in a wax ring which sealed the gap and we haven't had the problem since.