5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Local Sydney Blocked Drains on 21 Oct 2025

Blocked drains are an inconvenience that could cause disruption to your daily life. They could cause flooding, bad smells and even health risks. If they’re not treated promptly, blocked drains can cause serious issues in your plumbing system, which can lead to expensive fixes or replacings.

Key Takeaways

  • Blockages to drains can cause disruption to your daily life and result in problems with water, bad odours and even health hazards.
  • Fat, oil and grease build-up can clog the pipes’ walls, causing blockages; avoid pouring grease down the drain or make use of hot water and soap when washing dishes.
  • Tree roots naturally extend into the ground searching for nutrients which may cause significant damage, and also block the pipes completely which can cause flooding. Ensure you keep trees in the vicinity of drainage systems by trimming them.
  • The flushing of non-biodegradable products like wet toiletries, wipes, etc. could cause unpleasant odors emanating from toilets or bins. just take care to wash your toilet paper in the drain.
  • Hair

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

Cause 1. Grease, oil and Fat Buildup

Fat, grease, and oil might appear to be harmless substances to drain down the toilet, but as time passes, they build up in the pipes’ walls the pipes, which causes a blockage. As a result, water is unable to flow freely through the drainpipes. It is best to avoid throwing grease down the drain or use soap and hot water to wash your hands when cleaning dishes, as this helps break down grease-based substances.

Cause 2. Tree Roots

As time passes, tree roots naturally extend into the ground looking for nutrients. This implies that they expand towards underground pipes. Once inside the pipes, tree roots can cause massive damage and can completely block them leading to flooding. It’s important therefore if you have trees around to maintain the growth of your trees around drainage systems by pruning them on a regular basis.

Cause 3: Items that are soiled

It’s easy to assume that flushing items that aren’t biodegradable like the wet wipes, sanitary towel and so on. won’t cause any significant problems in the long term, however, if too many of these items go down toilets they will resultantly build up, pushing other items aside and blocking pipes – this can create unpleasant smells around toilets/bin areas too! Be aware of what needs to be flushed and which shouldn’t (i. e 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 Local Sydney Blocked Drains now and speak to one of our friendly team members.

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