Had one job where the trap looked fine, but a tiny crack underneath was letting it seep out slow—took forever to spot.
That’s wild, and honestly I’m not always convinced it’s just drafts or cracks. I had a basement job where the smell kept coming back even after refilling every trap. Ended up finding an old, half-capped cleanout behind some drywall—barely leaking, but enough to let sewer gas sneak in. Sometimes it’s not the obvious stuff, and you’ve gotta poke around in weird spots. Old houses, man... they’ve got secrets.
Sometimes it’s not the obvious stuff, and you’ve gotta poke around in weird spots. Old houses, man... they’ve got secrets.
Totally get that—old houses are like escape rooms for smells. Here’s what I’ve run into:
- Even a hairline crack in a vent stack can let gas drift down, especially if it’s tucked behind a wall.
- Floor drains with dried-out traps are classic, but sometimes it’s a missing cleanout plug, just like you said.
- Had one where the smell was actually from a dead mouse in the wall, not plumbing at all. That was... memorable.
It’s never just “refill the trap and done.” Always something hiding where you least expect it.
Had a job once where the homeowner swore it was a sewer leak, but after hours of chasing pipes and sniffing around, turned out to be a cracked foundation letting in swampy groundwater. The smell was almost identical to rotten eggs—sulfur bacteria, not gas. Sometimes you’re tearing up half the basement before you realize it’s not even the plumbing. Old houses really do keep you guessing... and humble.
Sometimes you’re tearing up half the basement before you realize it’s not even the plumbing. Old houses really do keep you guessing... and humble.
- Been there, done that. Chased a “sewer” smell for two days once—ended up being a dead mouse in the sump pit.
- Sulfur bacteria can really mess with your nose. Not always about pipes or drains.
- Foundation cracks are sneaky. Water seeps in, brings all sorts of smells with it.
- Pro tip: always check the sump and any crawlspaces before ripping out drywall. Saves a ton of headache (and back pain).
- Old houses? They’re like mystery novels, but with more mold.
Man, the number of times I’ve been called out for a “rotten egg” smell and it’s not even the plumbing... you’d be surprised. Sometimes it’s just a dry floor drain letting sewer gas creep up, or like you said, something nasty in the sump pit. Had a guy once who swore his pipes were shot—turned out his dog had dragged a dead squirrel behind the furnace. Old houses really do keep you on your toes. Always worth checking the simple stuff before you start demo’ing walls.