My Bathroom Sink Drain Smells Like Rotten Eggs

By | September 21, 2019

My Bathroom Sink Drain Smells Like Rotten Eggs: Why and How to Fix It

If your bathroom sink drain emits a foul odor resembling rotten eggs, don't ignore it. This unpleasant scent is a telltale sign of a plumbing issue that requires prompt attention to prevent further problems.

Causes of the Rotten Egg Smell

Bacteria thrive in dark, moist environments, making drains ideal breeding grounds. Hydrogen sulfide gas (H2S), commonly known as sewer gas, is a byproduct of their decomposition of organic matter, such as hair, soap scum, and food particles. This toxic gas has a strong odor that resembles rotten eggs.

Other potential causes of the rotten egg smell in your bathroom sink drain include:

  • Dry P-trap: The P-trap is the U-shaped pipe under your sink that holds water to prevent sewer gas from escaping.
  • Clogged drain: Hair, soap scum, and other debris can accumulate in your drain, blocking the flow of water and creating ideal conditions for bacteria to breed.
  • Damaged pipes: Cracks or leaks in your drainpipes can allow sewer gas to seep into your bathroom.

Health Risks of Hydrogen Sulfide Gas

While exposure to low levels of hydrogen sulfide gas is generally harmless, prolonged inhalation can cause health issues such as:

  • Eye irritation
  • Respiratory irritation
  • Nausea and vomiting
  • Headaches
  • In high concentrations, hydrogen sulfide gas can be fatal.

How to Fix the Rotten Egg Smell

If you detect a rotten egg smell coming from your bathroom sink drain, take the following steps to resolve the issue:

  • Run hot water: Pouring hot water down the drain can help flush out any buildup of bacteria and organic matter.
  • Pour baking soda and vinegar: Make a paste by mixing baking soda and white vinegar. Pour the paste down the drain and let it sit for several hours or overnight. Flush with water to rinse.
  • Use a drain cleaner: Commercial drain cleaners are effective in removing clogs and killing bacteria. Follow the instructions on the product label carefully.
  • Check the P-trap: Remove the P-trap by unscrewing the nuts that hold it in place. Clean it thoroughly with a drain brush and reinstall it, ensuring that it is properly sealed.
  • Call a plumber: If the home remedies do not eliminate the smell, you may have a more serious plumbing issue that requires professional attention.

Preventing the Rotten Egg Smell

To prevent the rotten egg smell from recurring, practice the following tips:

  • Clean your bathroom sink and drain regularly with a mild disinfectant.
  • Use a drain screen to catch hair and debris before they can clog the drain.
  • Avoid pouring grease, oil, and other solids down the drain.
  • Flush the drain with hot water once a week to prevent buildup.
  • If you notice a slow drain, address it promptly to prevent clogs.

By following these steps, you can eliminate the rotten egg smell from your bathroom sink drain and ensure a healthy and odor-free environment in your bathroom.


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