When your basement smells like rotten eggs: weird facts about wastewater mishaps

Had a similar situation last winter—thought it was just a dried-out floor drain, but nope, turned out to be a cracked sewer line under the slab. The smell was unreal. Lemon cleaner just made it worse, like rotten eggs with a side of cleaning aisle. Sometimes you just can’t shortcut these things...

Honestly, I've seen that lemon cleaner trick backfire more times than not. Sometimes, masking the smell just makes it linger even longer in the air, and yeah, the combo is brutal. But I wouldn't always jump straight to cracked lines under the slab. I've come across a lot of cases where it was just a dried-out trap or a venting issue—nothing nearly as catastrophic. Worth checking the simple stuff first before breaking out the jackhammer... saves a lot of headache (and cash) if it's just a neglected drain.

- 100% agree—jumping straight to slab leaks is overkill most of the time.
- Dried-out traps are sneaky and way more common than folks think. Quick fix: pour water down every drain you’ve got, especially if a shower or floor drain hasn’t been used in a while.
- Venting issues can be subtle. Had a job once where the vent stack was blocked by a bird’s nest... smell was unreal, but no digging needed.
- Lemon cleaner just adds “citrus sewer” to the mix if there’s an underlying problem. Not my go-to.
- If you’re getting that sulfur smell, always check for simple stuff first—saves money and your sanity.

Had a similar situation last winter—turned out the guest bathroom floor drain was bone dry. Never realized how fast those traps can dry out.

“Dried-out traps are sneaky and way more common than folks think.”

I had the same thing happen in our laundry room. If anyone else runs into that rotten egg smell, here’s what worked for me:
1. Pour a couple cups of water down every floor drain (don’t forget the utility sink).
2. Wait a bit, then check if the smell fades.
3. If it lingers, try a flashlight—sometimes debris blocks the trap from filling.

“Lemon cleaner’s just a cover-up, totally agree there.”