Why Your House Smells Like Sewage and What to Do About It — Straightforward Tests and Fixes

https://www.canberratimes.com.au/story/9118615/top-plumbing-warning-signs-you-shouldnt-ignore/

How common drain odors are, what they cost, and why you should take them seriously The data suggests drain and sewer smells are among the most frequent plumbing complaints homeowners call for