Common causes include a dry P-trap in an unused drain, a cracked drain pipe, a blocked or damaged roof vent pipe, a failed toilet wax seal, or organic matter build-up in drain traps.
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Frequently Asked Questions
How do I fix a sewer smell from an unused drain?
Simply pour water down the drain to restore the water seal in the P-trap. Adding a tablespoon of cooking oil helps the seal last longer by slowing evaporation.
Is a sewer smell in the house dangerous?
Sewer gas contains hydrogen sulphide and methane, which are toxic at high concentrations. A persistent smell should be investigated and fixed promptly. Ventilate the area and call a plumber if the smell is strong or persistent.
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