Can Blocked Drains Cause Bad Smells?

Nuclear disaster survivor with gas mask

Blocked drains can cause all sorts of problems in and around your home, and one of the biggest issues you might encounter is when blocked drains cause bad smells.

When it comes to assessing blocked drains, it’s important to understand whether they can cause fouls smells in the home, as well as what causes blocked drains, and how to prevent it from happening.

What Causes Blocked Drains to Smell?

Yes, blocked drains can indeed cause bad smells around your home.

Offensive smells coming from drains in the home is, regrettably quite common, and the two components that cause the foul smells are ammonia and hydrogen sulfide.

So it is important that you make sure you look at what it is that actually causes the smell from blocked drains.

1. Partial Blockages

Partial blockages can occur at any time, and will often be the reason for causing bad smells to come from your drains.

This generally happens when a product that doesn’t decompose is washed down the drain and becomes trapped.

Toilet plunger

It can happen a lot with a build-up of toilet paper as well, and this sometimes occurs in the U-bend.

A partial blockage can cause an accumulation of waste, and this can cause the smell to occur too.

2. Trapped Food

Trapped food is one of the primary causes of bad smelling drains

Flushing food scraps down the drain can cause bad smells

Generally, what will happen is that the food fragments that are washed down the drain will collect together and start rotting, and once the food starts to decompose, the smell will increase.

Try where possible to avoid washing food down the drain in order to combat this.

3. Sewer Problems

If you find that problems with smells are coming from sinks all over the house, then the problem could be a sewage-related issue.

“Yes, blocked drains can indeed cause bad smells around your home.”

This is generally something that will be obvious as the smell tends to be worse when the issue is with sewage (for obvious reasons).


If you believe there is a problem with sewage causing bad odours, then you need to get in touch with your council and let them know.

How to Fix This Problem

There are a few simple things you can do to prevent blocked drains causing bad smells.

Drain cleaning products are a great way to ensure your drains are running smoothly so waste product doesn’t accumulate.

Boiling water in the kettle and pouring it down the blocked drain can help stop bad smells

Try tipping boiling hot water down the plughole at the end of each day to loosen any grease deposits.

A combination of baking soda and white vinegar is another great way of being able to deal with the issue of blocked drains too.


If your drains continue to get blocked and smelly, then the best thing to do is to call your one of our professional Gold Coast Plumbers.

They’ll inspect the insides of your drains and find out why the blockage keeps happening and fix it for good!


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