Honestly, I’ve seen way too many folks jump to worst-case scenarios with that rotten egg smell. Nine times out of ten, it’s just a dry trap or a forgotten floor drain. Before you even think about backflow preventers or ripping up concrete, try this: pour a bucket of water down every drain in the basement—especially ones you never use. If the smell lingers, then yeah, smoke testing is a solid next step. It’s wild how often the “big fix” is just a $0.10 solution and not a $2k plumbing job.
Not saying you’re wrong, but I’ve had the “just pour water down the drain” trick backfire on me before.
Maybe in newer houses, but my old place had a cracked vent pipe behind the wall, and no amount of water fixed that. Took forever to track it down. Sometimes it really is something bigger, even if you wish it wasn’t. Just saying, don’t rule out the pricier fixes too quickly.“Nine times out of ten, it’s just a dry trap or a forgotten floor drain.”
That’s a good callout—sometimes it’s not just a dry trap or forgotten drain. I’ve seen “just pour water down the drain” work, but only when it’s actually a dry trap. Once you’re dealing with vent pipes or cracks behind the wall, you’re into a whole different ballgame.
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Couldn’t agree more. Chasing down sewer gas in older homes can turn into a real headache.“Sometimes it really is something bigger, even if you wish it wasn’t.”
- Water in the trap is only going to help if the trap’s intact and there are no leaks upstream.
- If you smell rotten eggs and topping off the traps doesn’t help, check for:
- Cracked or disconnected vent pipes (especially behind walls)
- Bad wax ring under toilets (common culprit)
- Floor drains that look fine but have failed gaskets underneath
- Any sign of mold or persistent moisture near plumbing? That’s usually a red flag for hidden leaks.
I always tell folks: trust your nose and don’t ignore that sulfur smell. If water doesn’t fix it quick, time to start looking deeper... sometimes the pricier fix is the only real solution.
Funny you mention the wax ring under the toilet—ran into that exact issue last winter. Folks kept dumping bleach down the floor drain, thinking it was just a dry trap, but the smell never budged. Turned out the wax ring had failed and sewer gas was sneaking up from underneath. Ever notice how those little leaks can go undetected for ages? Makes me wonder how many people just live with that smell, thinking it’s “normal basement funk.” Anyone ever had to tear up a finished floor just to get at a hidden leak? That’s always a treat...
Tearing up a finished floor for a hidden leak is the stuff of nightmares, honestly. Had to do it once in a rental—brand new laminate, too. Folks always think it’s just “old house smell” or something harmless, but that sewer gas is no joke. I’m with you, those little leaks can go undetected for way too long. It’s wild how many people just get used to it and never dig deeper. Sometimes you’ve gotta trust your nose and not just mask it with bleach or air fresheners.