Post By Admin
May 8, 2025Drain smells like rotten eggs isn’t something that people would love to face, but trust us, it happens a lot more than you think. But it does change your life for the worse.
That’s why, we, as a trusted blocked drain specialist, are about to drop the best tips of what you need to do. The fight of smelly drains in the bathroom will not be as challenging. Let’s get started!
What Causes Your Drain to Smell Like Rotten Eggs
That strong, sulphur-like odour is often a sign of something lurking deeper in your plumbing system. Here are some of the most common causes!
1. Smelly Garbage Disposal
In the kitchen, garbage disposals are a common source of nasty odours. Food scraps and grease can get stuck on the blades or in the nooks and crannies of the disposal unit.
Over time, as they break down, they start to emit a foul, sulphur-like scent that rises straight up through the drain.
If your kitchen sink suddenly smells like something died in it, the disposal is a good place to start sniffing around.
2. Bacteria Buildup in the Pipes
Both kitchen and bathroom sinks are prone to bacteria buildup, especially when organic materials like soap, hair, grease, or food particles accumulate.
As this bacteria feeds on the gunk inside your pipes, it releases gases like hydrogen sulfide.
In many cases, this can be the culprit when your bathroom sink smells like rotten eggs, especially if it’s an older or rarely used sink.
3. Dry or Broken P-Trap
Every sink has a P-trap—that curved section of pipe underneath that holds a bit of water to act as a barrier between your home and the sewer line. If the trap dries out due to disuse or is leaking, that barrier disappears.
The result? Nasty sewer gases escape through the drain and it makes the sink smells like sewage. This is often the case in guest bathrooms or utility sinks that don’t get much action.
4. Clogged or Blocked Vent Pipe
Your home’s plumbing system uses vent pipes to equalise air pressure and safely direct sewer gases out through the roof.
If one of these vents gets clogged—by leaves, animal nests, or even snow—those gases can end up rerouting themselves through your drains instead.
That’s when you get a strong, unpleasant sulfur smell from the sink that just won’t go away, no matter how much you clean the surface.
5. Contaminated Water Heater
This one’s more specific to when the smell comes and goes with hot water. Some water heaters develop bacteria inside the tank, especially if the temperature is set too low.
When the hot water runs, it can carry that unmistakable rotten egg smell through the kitchen or bathroom sink.
While it’s less common, it’s definitely something worth considering if the smell is only present with hot water.
How to Get Rid of the Smell of Rotten Eggs in Your Drain
Want to get rid of your smelly drain right now? Start doing something from these easy methods:
1. Clean Your Garbage Disposal
If your kitchen sink has a disposal unit, trapped food scraps could be the culprit. Cleaning it removes smelly residue and freshens the drain.
Steps:
- Turn off the disposal for safety.
- Drop in a handful of ice cubes and a few lemon slices.
- Turn the disposal on and run cold water as it grinds.
- For deeper cleaning, scrub the inside with a brush and soapy water.
2. Flush the Drain With Hot Water
Boiling water can help dissolve minor blockages and rinse away odour-causing residue. It’s the easiest first step to try before moving on to stronger methods.
Steps:
- Boil a full kettle of water.
- Slowly pour the hot water down the smelly drain.
- Repeat once or twice if needed.
- Finish by running cold water for 30 seconds.
3. Use Baking Soda and Vinegar Combo
If the smell isn’t too strong yet, this natural duo can help. Baking soda and vinegar react to clear away light grime and bacteria, but they’re only effective for simple trouble—don’t expect them to fix major clogs.
Steps:
- Pour ½ cup of baking soda into the drain.
- Add 1 cup of vinegar and let it fizz.
- Leave it for 15–20 minutes.
- Rinse thoroughly with hot water.
4. Use Chemical Drain Cleaners
When natural methods don’t work, many people turn to chemical drain cleaners. While they can dissolve stubborn clogs, they’re harsh on pipes and don’t always solve the root cause of bad smells.
Steps:
- Choose a cleaner suitable for your plumbing.
- Wear gloves and ensure good ventilation.
- Carefully follow the product instructions.
- Rinse the drain with plenty of water afterwards.
5. Unblock a Drain That’s Clogged or Slow
If your sink is draining slowly or backing up, it’s time to unblock the drain. Blockages can trap bacteria and debris, making that rotten egg smell even worse.
Steps:
- Use a plunger to try and loosen the clog.
- Insert a drain snake or wire hanger to remove buildup.
- Remove and clean the P-trap under the sink if you’re comfortable.
- Rinse with hot water to clear away any remaining residue.
Also Read: How to Fix Smelly Toilets
FAQ about Drains Smell Like Rotten Eggs
What drain cleaner gets rid of sulfur smell?
Look for a drain cleaner that targets bacteria and organic buildup. Enzyme-based cleaners are gentle and effective, but for tough smells, chemical drain cleaners may help—just use them with caution.
What is the best thing to pour down a smelly drain?
A mix of baking soda and vinegar works well for light odours. For deeper smells, hot water flushes, enzyme cleaners, or cleaning your garbage disposal are great next steps.
Should I call a plumber if my water smells like rotten eggs?
Yes, especially if the smell is coming from multiple faucets or your water heater. It could point to a plumbing or water supply issue that needs professional attention.
Conclusion
If your drain smells like rotten eggs, it’s usually a sign of bacteria or trapped gunk—not a serious issue, but definitely an unpleasant one.
While some DIY methods can help, it’s not always easy to fix, especially if the smell keeps coming back.
If you’re tired of dealing with it or just want it gone for good, call Neighbourhood Plumbing. We’ll find the root of the problem and get your drains clean, clear, and smelling fresh again.
About the Author
From unclogging the toughest drains to repairing leaking toilets, Ricky is a seasoned plumber who has brought his craftmanship to homes across Melbourne. He is passionate about sharing plumbing tips just as much as he is about fixing your plumbing issues. So, when your taps or pipes begin leaking, you know who to call.
