Now, this one is a horror movie plot. If the rotten egg smell is random and intense, it might be sewer gas backing up through a dry trap. Every sink and floor drain has a U-shaped pipe that holds water, blocking smelly sewer fumes from invading your home.
Why Does It Smell Like Rotten Eggs
No water in that pipe? Boom. You’ve got a direct line to the underground swamp. Just dump a bucket of water down rarely-used drains (like that basement floor drain nobody looks at) and say “goodbye” to the egg reaper.
The Red Flag: It’s Not Just an Annoyance
Before you laugh this off, know this: natural gas companies add a rotten egg smell to propane and methane so you can detect leaks. If you smell it near your stove, furnace, or any gas line, do not turn any lights on or flip switches. Leave immediately and call the gas company.
I know, I know—I sound like a safety pamphlet at your mom’s house. But dying for the sake of a blog read is not on my bucket list, okay? Trust your nose on this one.
