Why does my bathroom smell like sewage or rotten eggs?
That sewer smell is unpleasant, but it’s usually fixable. Here’s what’s likely going on:
Dry P-trap – This is the most common cause. Every drain has a curved pipe underneath that holds water to block sewer gas. If a drain hasn’t been used in a while, that water evaporates. Quick fix: Run water for 20-30 seconds in all drains, especially ones you don’t use often (guest bathrooms, basement floor drains).
Toilet wax ring – If the smell is strongest near the toilet, the wax seal between the toilet and floor may be failing. You might also notice the toilet rocking slightly. This needs a plumber to reset the toilet with a new ring.
Vent pipe issues – Your plumbing has vent pipes that go through the roof to let sewer gas escape outside. If these get blocked (leaves, bird nests, ice) or cracked, gas backs up into your home. Gurgling drains are a telltale sign.
Sewage ejector pump – If you have a basement bathroom, check that your ejector pump is working properly. A failing pump can cause odors.
Important: If the smell is more like natural gas (rotten eggs but sharper), leave immediately and call 911 – that’s a gas leak, not a sewer issue.
If running water in your drains doesn’t solve it within a day, it’s time to have a plumber inspect your sewer and vent lines. Would you like help scheduling that?
Quick explainer from Erin
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