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Why Toilet Smells like Sewage, and How to Get Rid of the Odor

You clean your toilet regularly, but why it still smells like sewage? This article will not only shows you the possible reasons why toilet smells like sewage, but also provides you with helpful tips to get rid of the horrible odor.

by Niko | 2019-07-28 Share:

The bathroom is definitely the most “special” space in your home. Have you had this concern? You keep cleaning your toilet more often, but it still smells like sewage. There are a number of factors and things can cause a sewage smell coming from your toilet, and it’s always difficult to identify the source of the odor.

In addition to the unpleasant smell, the methane that is found in sewer gas can be harmful to the health of you and your families. No one will want to walk into the bathroom by cynically holding the nose. The following article lists possible reasons why toilet smells like sewage. Besides, you can also find tips to get rid of the horrible odor. No longer suffer from a smelly toilet.

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Why toilet smells like sewage, and how to get rid of the unpleasant odor? Let’s check the possible reasons why your home toilet smells like sewage.

1. No Water in the P-Trap at All

This one is the most common cause, and it’s also the simplest one that you can deal with. Firstly, you’ll need to know what the P-Trap is. Actually, the P-Trap is a U-shaped section of pipe that underneath the sink and holds water.

In normal circumstances, the P-Trap will be filled with water remains after you flush your toilet. It can prevent sewage gas from rising up through your toilet, and then get into your bathroom. But if your house is vacant, and the toilet is not in use for a very long time, water in the P-Trap may evaporate and there is no water at all. This resulted in the bad smell in your toilet (or bathroom).

Simply flush your toilet, repeated several times, to restore the water supply in the P-Trap. Then, you can wait a little while and see if the sewage smell has disappeared.

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2. Toilet Drain is Clogged

Small clogs can build up in the drain of your toilet and bacteria grow on them easily and quickly, even if you flush toilet in a proper way. Over times, your toilet smells like sewage, and it will get worse if you don’t clear the clogs in the toilet drain. Have no idea on how to unclog a toilet with or without plunger?

For more detailed information:

>> 3 Ways to Unclog Toilet without a Plunger

>> Tips You Must Know When Unclogging a Toilet with Plunger

3. Something Wrong with the Vent Pipe

When you notice that your toilet starts smelling like sewage, and you’ve already ruled out the first two possibilities, then it must be something wrong with the vent pipe. Improperly installed vent pipe, cut vent pipe or clogged vent pipe.

There is a vent pipe connected to the plumbing system, allowing air to flow and ventilate sewage gas. If the vent pipe is clogged, the sewage gas cannot be sent outside and it causes sewage smell in your toilet and bathroom. No matter the vent pipe is improperly installed, damaged or clogged, this is something that you may not be resolved. You need to call a professional plumber to clear or reinstall it.  

4. Bacteria in the Toilet Bowl

This issue is particularly evident in the summer. Microorganisms and bacteria from the sewers get into your toilet, and stick to your toilet bowl. The humid and hot conditions make them multiply and thrive rapidly. Your toilet smells like sewage very soon.

Fortunately, this can be fixed in a very easy way. You can use home-made cleaning solutions to clean the toilet bowl or directly pour a couple of cups of bleach down your toilet to kill those sticky microorganisms and bacteria, and get rid of the sewage smell.

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If you still cannot find the source of your toilet smelling like sewage after trying the above possibilities and solutions, we suggest you to contact for plumbing service.

Related Readings for Reference

• How to Fix A Toilet That Keeps Running with 3 Steps

• How to Fix a Leaking Toilet – Fix Internal & External Toilet Leak Yourself

• How to Adjust Toilet Float Less Than 5 Minutes

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