Sewer Smell in the House: Causes, Risks, and Fixes
March 9, 2026

Quick Answer

Sewer smell indoors is often caused by a dry P trap, a failing wax ring, venting issues, or sewer line problems. Run water in unused drains, check for leaks at toilets, and schedule an inspection if odors persist.

Common causes homeowners miss

  • Dry trap in guest bath or floor drain
  • Loose toilet seal or failing wax ring
  • Vent pipe issues or blocked vent
  • Sewer line blockage forcing gas back into the home

What you can do today

  • Run water in every sink, tub, and shower
  • Pour water into floor drains
  • Check toilet base for movement or moisture
  • Avoid chemical drain cleaners that can damage plumbing

When to call

  • Smell continues after traps are filled
  • Multiple drains affected
  • Gurgling sounds, slow drains, or backups

FAQ

  • Is sewer gas dangerous?

     It can be unhealthy and should be addressed.

  • Why does it come and go?

    Traps dry out, venting changes, and pressure shifts.


  • Does a drain clog cause smell?

    Yes, especially with buildup.


CG Plumbing can identify the source quickly and fix it cleanly so your home stays safe and comfortable.

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