5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Sydney Plumber Blocked Drains on 26 Oct 2025

Blocked drains can be a nuisance that can disrupt your daily life. They can lead to water damage, bad smells, or even health risks. If they are not addressed promptly blocked drains could cause grave problems to your plumbing system, which could lead to costly maintenance or repairs.

Key Takeaways

  • Blocked drains can disrupt your daily life and result in water damage, bad smells, and even health issues.
  • The fat, oil and grease build-up can clog the walls of pipes causing blockages. Avoid pouring grease down the drain or use hot water and soap for cleaning dishes.
  • Tree roots naturally grow into the ground searching for nutrients which may cause significant damages and blockages to pipes which can cause flooding. Ensure you maintain trees near drainage systems by trimming them.
  • The flushing of non-biodegradable products like wet wipes, sanitary towels etc. could cause unpleasant odors that can be detected around bins and toilets; only wash toilet papers down drain.
  • Hair

In this post, we’ll explore five reasons for blocked drains and what you can do to prevent them from happening.

Cause 1. Grease, oil and Fat Buildup

Fat, grease and oil may appear like harmless materials to dump down the drain but they can build up on the walls of the pipes, which causes a blockage. In this case the water can’t flow freely through drainpipes. The solution is to avoid spilling grease down the drain. Or use hot water and soap during cleaning dishes, as this helps break down greasy substances.

Cause 2. Tree Roots

In time, the tree roots naturally extend into the ground in search of nutrients, which leads to them expanding toward underground pipes. Once inside these pipes tree roots could cause significant damage and could completely stop them from flowing, causing flooding. It’s crucial, therefore, if you are near trees to regularly monitor their growth around drainage systems, by trimming them in a regular manner.

Cause 3: Items that are soiled

It’s easy to assume that flushing biodegradable products such as toilet paper, wet wipes and so on. aren’t likely to cause major issues in the end, however, if too many of these items are flushed in toilets, they’ll accumulate pushing others aside that block pipes. This can cause a bad smell to be released around bins and toilets! Make sure to remember what should be flushed and what shouldn’t (i. it is only toilet paper should have to be flushed).

Cause 4: Hair

Additional Information

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Are you experiencing a clogged toilet, blocked shower drain, overflowing drains or an issue with your kitchen sink? We can help you sort out your drain blockage problem quickly and provide the following services:

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Clearing blocked drains can be difficult and it’s best to get a professional plumbing service involved to tackle it for you, To get your blocked drain in Sydney cleared today, contact Sydney Plumber Blocked Drains now and speak to one of our friendly team members.

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