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Reviewed by Marcus Aldridge — Senior Editorial Reviewer — Plumbing, HVAC & Wet Trades

Who to call · Plumber

Sewage smell in the bathroom: call a plumber — or fix it yourself

A persistent sewage or rotten-egg smell in a bathroom usually means sewer gas is escaping past a defence that should block it — a dried-out drain trap, a failed toilet wax seal, or a blocked or missing vent pipe. Beyond the odour, sewer gas is unpleasant and, in high concentrations, unhealthy. A plumber can trace the source, refill or repair the trap, reseat the toilet, and clear the vent so the smell stops for good.

Is this your problem?

Symptoms to look for

  1. 01

    Rotten-egg or sewage odour strongest near a drain or the toilet

  2. 02

    Smell returns after a drain has gone unused for a while

  3. 03

    Gurgling from drains when a fixture empties

  4. 04

    Odour worsens on windy days or when other fixtures run

Who to call

Plumber

A plumber smoke-tests the drain system to find a cracked vent or dry trap you cannot see, resets the toilet on a new seal, and clears a blocked vent stack from the roof.

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Fix it yourself

How to fix sewage smell in the bathroom

Sewage smell in the bathroom

easy 15–45 min

Tools: flashlight, bucket, screwdriver · Materials: baking soda and vinegar, wax ring or rubber toilet seal (if the toilet is the source)

Steps

  1. Run water into every drain in the room for a minute, including the floor drain and any unused shower — a dried-out trap lets sewer gas straight in.
  2. Pour a cup of baking soda and a cup of vinegar down the shower and sink drains, wait 15 minutes, and rinse; biofilm in the overflow smells too.
  3. Check the toilet base: if it rocks or the floor around it is damp, the wax seal has failed.
  4. Look at the washing-machine standpipe and the sink overflow for slime, and clean them.
  5. If the smell is strongest with the fan running, check the roof vent for a bird nest or leaves from outside, never from the roof itself.

Stop and call a pro if

  • the smell comes and goes with wind or when the toilet flushes — the vent stack may be blocked or cracked
  • there is a sewage smell in more than one room, or in the garden
  • the toilet seal has failed and the subfloor is soft

What a pro does that you can't

A plumber smoke-tests the drain system to find a cracked vent or dry trap you cannot see, resets the toilet on a new seal, and clears a blocked vent stack from the roof.

DIY cost: $5–25 for cleaning supplies or a wax ring

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FAQ

Frequently asked questions

Who should I call for: Sewage smell in the bathroom?

Call a licensed plumber. Plumbers have the specialized training, tools, and insurance to diagnose sewage smell in the bathroom safely and stand behind the fix. Most offer free quotes and can visit the same day or the next.

Can I fix this myself?

Often, yes: the guide above has 5 steps (easy, 15–45 min, $5–25 for cleaning supplies or a wax ring). Stop and call a plumber if the smell comes and goes with wind or when the toilet flushes — the vent stack may be blocked or cracked.

How fast can a pro come out?

Most plumbers offer same-day or next-day visits for non-emergency issues. True emergencies (burst pipes, gas smell, no heat in winter) are typically handled within 1–4 hours.

How much does it cost to fix?

Costs vary by severity and your location. Submit a free quote request to get real pricing from local pros in your area.

What are the signs of: Sewage smell in the bathroom?

Rotten-egg or sewage odour strongest near a drain or the toilet. Smell returns after a drain has gone unused for a while. Gurgling from drains when a fixture empties. Odour worsens on windy days or when other fixtures run.

Who to call

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