Sewage Smell in Your House? 6 Causes and How to Get Rid of It
By Top Florida Plumbers · Updated 2026-11-08
Sewer gas smells bad, and it isn't harmless – it can contain methane and hydrogen sulfide. Here's how to track down the source.
Common causes
- Dry P-trap – a sink, floor drain or guest bathroom that isn't used lets the water seal evaporate. Run water for a minute.
- Failed toilet wax ring – a rocking toilet or smell near the base means the seal is gone.
- Blocked or damaged plumbing vent – birds' nests, leaves or a cracked vent pipe let gas back into the house.
- Cracked or broken sewer line – especially if the smell is strongest outside or in the yard.
- Sewage backup in a floor drain or cleanout
- Biofilm in drains – a sulfur smell from one sink is often just bacteria in the drain.
What to do
Refill dry traps, then check whether toilets rock. If the odor persists or comes with slow drains and gurgling, call a plumber. We use smoke testing and sewer cameras to find cracks and leaks quickly, and we repair sewer lines with trenchless methods wherever possible.
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