I am adding a bathroom in a basement (on a pit system) The house is about 40 to 50 years old and the plumbing system is on a septic system. Whenever it rains hard they get sewer smell in the basement only. I have not cut into any drains or vents yet. I can't find any old drains or vents that have been cut. This problem has been going on for a couple of years and the homeowner has had multiple plumbing and septic companies out and they have not fixed or found the problem. The homeowner has had the septic tank cleaned about 5 months ago. Does anyone have any ideas where the smell is coming from and why it only happens when it rains?
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