When a Quiet Gurgle Turned into Three Flooded Basements: My Sewer Lesson

https://dlf-ne.org/why-your-house-smells-like-sewage-and-what-to-do-about-it-straightforward-tests-and-fixes/

It started as a small annoyance. I was washing dishes while my teen flushed the toilet and I heard a strange gurgling from the sink. A few days later, the bathtub bubbled when the upstairs toilet was flushed