Is Your Toilet smells like sewage after flushed? You are in the right place. I can imagine how awful odor it is while after flush- most embarrassing, killer smell.
The sulfur smell in the toilet can produce several reasons like vent pipe has an issue, dry out water barrier, etc.
In the year back, I had faced with my Kohler Cimarron the same sewer smell all over my toilet after a flush.
Guess what doing everything, and ended up calling a plumber and paid more than 300 dollars to solve such a silly problem.
The man was very polite and gave all the details about the septic tank, how to clean the air vent without climbing the roof, and what to do if the sewage smells spread after rain, so further there is no need to call them.
I think you also not to spend bucks for such easy problems- I give the details- about why there is sewage smell in the toilet while flushed and what to do.
- Why does the toilet Smell Like Sewage After Flushing
- Final Word- Toilet Smells Like Sewage After Flushed
Why does the toilet Smell Like Sewage After Flushing
There are two to three major reasons for a toilet being smelly when flush.
- P-trap
2. Air vent pipe
3. Clogged Drainage
Other reasons for rotten egg smell after flushing toilet like- Cracked Toilet Bowl, Broken wax seal, Rarely used toilet and faucets. These occur in the minor case.

P- Trap can Cause for Smell in the Toilet
P- trap is an extra plumbing fixture installed in the home particularly below the sink. P- trap works as a water-barrier too.
If you notice extra piping below the nearest bathroom sink or in the kitchen that is P-trap. P- trap lies horizontally so its U bend can hold water.
The U bend holds and seals the water to prevent gases from the toilet too. P-trap also acts as an air venting system. It directly conjoins to the vent stack.
Whenever you use the sink or the toilet the wastewater flows from there, and sewer odor passes to the vent stack, seal water prevents to return odor.
If you notice egg smells coming from the toilet after flushing, then it’s definitely the P-trap issue. Either it’s stuck with fibers, hairs, etc, or it cracked somewhere.
How to clean P-trap Mess
Take toilet snake and simply snake it out. Toilet snake remove all fiber materials clog there. Or use the best toilet unclogger.
Green Gobbler’s industrial-strength drain clog remover is one of the best, safe, eco-friendly, profession use clog removers. My plumber suggests Green Gobbler’s Drain Cleaner.
I have used it since and it has given me a wondrous result. Whenever I feel the drain is going to be blocked, or slow drain. I put in 2 cups, and it has done its job amazingly well.
I must say Green Gobbler’s drain clog remover is my savior. It can be your savior too. It is one product that covers everything from the toilet bowl to the kitchen sink and is used in all.
Green Gobbler eco-friendly drain clog remover only breaks down the clogging agent, does not harm the septic tank, and even does not kill the enzyme and bacteria responsible for the waste breakdown process.
The AIR VENT PIPE is Another Main cause for Sewer Smell Coming out From The Toilet When Flush
The plumbing air vent or Vent stack is generally installed on top of the roof to circulate the toxic gases from the house.
The vent pipe is connected to the toilet, some other faucets of your house.
Plumbing Vent stack work one way, whenever use the toilet the solid waste goes down through the drainage pipe, and the Gas moves upper remove from the roof vent.
Natural disasters, snowfalls, birds getting stuck, leaves getting stuck – all of these cause the vent pipe to close, creating clogs. As a result, waste gas does not come out but returns to the toilet.
A blocked vent pipe can cause the toilet to overflow without a clog.
Then whenever you flush the toilet, there is a rotten stench. You can hear a sound like Gurgling. Do you ever hear that sound from the toilet? If so, immediately unclog the vent stack.
How to Prevent Smell if Vent Stack Cause the Problems
First, try to unblock the vent pipe, then use the Vent Cap for further prevention.
Recently, my neighbor installed a Camco vent cover on their roof vent. Although it is for RVs, it perfectly fits into their roof vent.
They are very satisfied with the result. If my vent cap gets old, I’m definitely going to buy a Camco Vent Cover.
Do you know the best part? It is from Camco, the most trustworthy company for plumbing at an extremely reasonable price.
Clogged Drainage is Another Cause For Sewage Like Smells in Toilet After Each Flush
It’s true we always throw toilet papers, dentures, toys, etc in the toilet, no wonder flush down them.
Toilet blocking is most common, and things can get messed up after clogging the toilet drain even overflowing.
A toilet mostly blocked its trap-way seal. You can use the Green Gobbler drain opener to unclog the drain.
Other Significant Reasons For Toilet Sewer Odor
Wax Seal Damage
Wax ring or Wax seal locates beneath the toilet bowl. It seals the main sewage drain and toilet trapway and prevents leakage.
Each toilet base includes a wax ring that aids in the sealing of water leaks and odor after flushing.
The worn or damaged wax seal does not keep the odor at bay during flushing. If you feel toilet rocks as you sit, it means the seal has been broken.
Simply replace the wax ring and the problem is solved.
Cracked Toilet
Oh my God! In very unlucky if toilet cracks, you can’t see the crack. You have to buy a new toilet for this.
Because the toilet bowl has a crack, water can flow through it, causing sewer odors to enter the bathroom.
The most serious issue is a cracked toilet.
Unused Toilet
An unused Toilet probably causes an egg smell odor because the water barrier becomes dry, and it can’t prevent the sewer gas back.
To avoid such a situation, use the toilet on a regular basis or flush at least once a day.
Final Word- Toilet Smells Like Sewage After Flushed
Sewer smell indicates not a good sign. The toilet needs fixing or removal since it is clogged. You may not always be able to pinpoint the root reason. Then you’ll have to call a specialist.
The filthy toilet smells like rotten eggs, which is most likely due to hydrogen sulfide gas. Hydrogen Sulfide is produced by sewer bacteria. -This is not very hazardous to one’s health.
However, the true danger is Methane Gas– Which can result in life-threatening symptoms such as vomiting, fainting, and exploding.