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The Daily Insight

Why does my bathroom sink water smell like sewer

Author

Gabriel Cooper

Updated on April 04, 2026

Generally, a rotten egg (or sulfurous), decayed or sewage-like odor in household water is a result of bacterial activity, which can be due to: Bacteria growing in the drain: This is the most common cause of these types of odors. … The bacteria can produce a gas that smells like rotten eggs or sewage.

How do you get rid of sewer smell in bathroom sink?

Pour baking soda and vinegar down the drain: Run hot tap water for several seconds, and then turn the water off. Dump one cup of baking soda down the drain followed by two cups of hot vinegar. Let the concoction fizz. After one hour, flush the drain with hot tap water.

Why does my faucet water smell like sewage?

Your water smells of sewage due to bacteria in your drain pipe producing gases that arise when the faucet is turned on. … It is commonly caused by bacteria that forms in your hot water heater when it is run at low temperatures or turned off for a period of time. Hydrogen sulfide can be smelled at levels as low as .

How do you get rid of sewer water smell?

3) Bleach can be used to eliminate the sewage smell. Pour three cups of bleach into drains and toilets. You can also pour three cups of mineral water into drains. 4) To get rid of the smell, make a mixture of water and bleach in a large bucket.

Why does bathroom sink smell like rotten eggs?

A smelly sink is usually caused by bacteria build up from grease, fat and food which have been flushed down the drain. These will then get stuck in the pipes causing the familiar rotten egg smell.

Why does my water smell like rotten eggs?

Hydrogen sulfide gas (H2S) can give water a “rotten egg” taste or odor. This gas can occur in wells anywhere and be: Naturally occurring – a result of decay and chemical reactions with soil and rocks. Produced by certain “sulfur bacteria” in the groundwater, well, or plumbing system.

How do you fix a smelly P-trap?

To eliminate odors coming from a dry p-trap, pour half a gallon of water into the trap to restore the barrier. It will prevent the odors from seeping through the drain. Another helpful method is to add a cup of white vinegar bleach to get rid of larvae and slow down the evaporation.

Can sulfur in your water harm you?

Sulfur is found in many foods and is considered a vital part of a healthy diet, but too much sulfur in your drinking water can lead to diarrhea and dehydration. Sulfur not only stinks and makes your water taste bad, it can also stain your sinks, toilets, and clothing and even damage plumbing.

Why does my bathroom smell weird?

Shampoos, soaps, hair and bodily fluids can congeal at the bottom of the waste, and when they accumulate, they will emit a smell. You can use drain-cleaning solutions to remove this sludge from the bottom of the trap.

Why does my water smell like poop?

One of the common reasons is drain obstacle or drain clogs. An block in the drain will often prevent water from flowing freely through the pipes. Oftentimes, the water become stuck along with other solid materials. And once these materials start to rot or decompose, it produces a poop-like smell.

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How do you get the rotten egg smell out of a drain?

If your drain smells like rotten eggs, you must disinfect the pipes to get rid of the odor. You can eliminate the bacteria by pouring a ½ cup of bleach down your drains. However, if you would like an alternative, pour down ½ a cup of baking soda and 1 cup of vinegar.

How do I know if my P-trap is bad?

One common reason your drain smells bad is a dried p trap. A dried p trap will result in a sewer odor emitting from a sink that maybe hasn’t been used in a while. A p trap is designed to use water to block the sewer gases from leaking up the drain. If a sink’s p trap dies out this can result in a drain that smells bad.

How do I stop my bathroom drains from smelling?

  1. Drain brush cleaner.
  2. Boiling water.
  3. Baking soda.
  4. White distilled vinegar.

Where is P-trap located?

The P-trap is a crucial element of the home plumbing system. It is the U-shaped section of the pipe located underneath the sink. Its function is to trap and hold enough water, which acts as a barrier to prevent sewer gases and odors from making their way into the bathroom.

Why does my sink water smell?

Bacteria growing in the drain: This is the most common cause of these types of odors. Over time, organic matter such as hair, soap and food waste can accumulate on the walls of the drain. These deposits serve as a food for bacteria to grow. The bacteria can produce a gas that smells like rotten eggs or sewage.

Why does sewer smell come and go?

One of the most common causes of sewage smells is a clogged drain. When your home’s wastewater has nowhere to go, the odors will come back up the drain they should be going down.

Is it OK to shower in water that smells like sulfur?

It’s perfectly safe to shower in sulfur water. Doing so won’t endanger your health or wellbeing. Having said that, the presence of sulfur water in your plumbing might cause it to rust or corrode over time. Especially if the sulfur water contains high amounts of hydrogen sulfide.

Why do I always smell rotten eggs?

Common olfactory hallucinations include lots of icky odors. Sufferers report smelling hydrogen sulfide (rotten eggs), bad perfume, garbage, a gas leak, wet dog, pungent body odor or spoiled fish or feces.

Why does my house randomly smell like sewer?

Possible Causes for the Sewer Smell: leaks from rotted or cracked drain pipes. a clogged drain. loose-fitting pipe connections. a stopped-up or too-short vent pipe.

Why does my house smell like sewer at night?

The first and most common cause of a sewer smell in your house is the bacteria and decomposing waste in the sewer system. … Residential toilets have a u-shaped sewer trap in their system where water accumulates, forming a barrier between the sewer gases and your home.

Can I pour bleach down the drain?

Bleach and cleaning fluids create toxic gasses when mixed together. If you pour bleach and other cleaning agents down your sink drains, and they mix in your pipes, you can contaminate the air in your home with the resulting gas created. The following items should never be poured down the sink with bleach: Vinegar.

Can P traps dry out?

P-traps can dry out as quickly as a month, sometimes even less than that. This happens most often in winter. To prevent your P-trap from drying out, run the sink or shower for a minute or two once a week to keep water flowing and your P-traps from drying out.

Why does my bathroom smell like sewer after I shower?

Smelling sewer in the home means there is an issue in the shower with the drain, a vent pipe that is cut or not installed properly on the toilet, or seals that are broken or loose. Finally, a build-up in the overflow of the sink can also cause this smell.

How do you tell if your sewer vent pipe is clogged?

  1. A Primer on Plumbing Vents. …
  2. Water Takes A Long Time to Drain. …
  3. Dry and Empty Toilet Tanks. …
  4. Foul Smells. …
  5. Gurgling or “Glugging” Sounds as Water Goes Down the Drain. …
  6. Get Those Clogs Out of Your Plumbing Vent ASAP.