Why Your Kitchen Sink Smells Like Sewage (And How to Stop It)

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Few things are more unpleasant than walking into your kitchen and being hit with the foul odor of sewage coming from your sink. Not only is it disgusting, but it can also indicate a serious plumbing issue that needs immediate attention.

In this guide, we’ll explore the most common causes of a smelly kitchen sink, DIY solutions to try, and when it’s time to call a professional plumber. If you're in Gloucester Township and need expert help, Mr. Rooter Plumbing of South Jersey is your trusted local plumbing team for fast, reliable service.




Why Does My Kitchen Sink Smell Like Sewage?


A sewage smell from your kitchen sink is usually caused by one of these six common problems:


1. Clogged or Dirty P-Trap

The P-trap (the U-shaped pipe under your sink) is designed to hold water, creating a barrier that prevents sewer gases from entering your home. If it’s clogged with food debris, grease, or soap scum, the water can evaporate, allowing foul odors to escape.

✅ Fix:

  • Remove and clean the P-trap.

  • Pour a mixture of baking soda and vinegar, followed by hot water to break down buildup.


2. Blocked or Damaged Vent Pipe

Your plumbing system has vent pipes that regulate air pressure and allow sewer gases to escape outside. If these vents are clogged (by leaves, debris, or even a bird’s nest), gases can back up into your sink.

✅ Fix:

3. Garbage Disposal Buildup

Food particles, grease, and bacteria can accumulate in your garbage disposal, leading to a rotten egg smell (often caused by hydrogen sulfide gas).

✅ Fix:

  • Grind ice cubes and citrus peels to clean the blades.

  • Run a bleach solution (1 tbsp bleach + 1 quart water) to kill bacteria.


4. Sewer Line Backup

If multiple drains in your home smell bad or gurgle, you may have a sewer line clog or break. This is a serious issue that can lead to sewage backup.

✅ Fix:

  • Avoid using chemical drain cleaners (they can damage pipes).

  • Call a professional plumber immediately for a camera inspection.


5. Bacteria Growth in the Drain

Over time, organic matter (food scraps, grease, soap) can stick to pipe walls, creating a breeding ground for smelly bacteria.

✅ Fix:

  • Pour boiling water + baking soda weekly to break down residue.

  • Use an enzyme drain cleaner to eat away organic buildup.

6. Dry or Cracked P-Trap Seal

If your sink isn’t used often, the water in the P-trap can evaporate, letting sewer gases seep in. In rare cases, the P-trap may even crack.

✅ Fix:

  • Run water in unused sinks periodically.

  • Replace a damaged P-trap if needed.


How to Permanently Eliminate Kitchen Sink Odors

Step 1: Clean the Garbage Disposal

  • Grind ice + salt to scrub the blades.

  • Follow with lemon or vinegar to deodorize.

Step 2: Flush the Drain with Hot Water & Baking Soda

  • Pour 1/2 cup baking soda down the drain.

  • Add 1 cup vinegar, let it foam for 10 minutes, then rinse with boiling water.

Step 3: Check the P-Trap

  • Place a bucket under the sink.

  • Unscrew the P-trap, clean it, and reattach securely.

Step 4: Inspect the Vent Pipe

  • If you suspect a clog, a professional may need to clear it.

Step 5: Call a Plumber if the Smell Persists

If DIY methods don’t work, you may have a hidden sewer line issue that requires expert attention.


When to Call a Professional Plumber

🚨 Call a plumber immediately if:
✔️ The smell persists after cleaning
✔️ Multiple drains are affected
✔️ You hear gurgling sounds
✔️ Water backs up into other sinks

For fast, reliable service in Gloucester Township, contact Mr. Rooter Plumbing of South Jersey. Our licensed technicians use advanced camera inspections to locate hidden clogs and get your plumbing back to normal.

📞 Schedule an appointment today!


Final Thoughts

A smelly kitchen sink is usually fixable with simple cleaning, but sewer gas smells should never be ignored. If the odor won’t go away, don’t hesitate to call a professional.

Mr. Rooter Plumbing of South Jersey is here to help with emergency plumbing services, drain cleaning, and sewer repairs. Trust the experts to keep your home smelling fresh!

🔧 Need help now? Call us for same-day service!

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