5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Sydney Blocked Drains Plumbers on 17 Sep 2026

Blocked drains are an inconvenience that could cause disruption to your daily life. They can cause smelly water damage, bad smells, and even health risks. If not promptly dealt with, blocked drains can cause serious problems in the plumbing system, which can lead to costly repair or even replacement.

Key Takeaways

  • Blocked drains can disrupt your routine and can cause the destruction of your home, bad smells, and even health risks.
  • Fat, oil and grease build-up can clog the walls of pipes causing blockages. Do not pour grease down the drain. Alternatively, use hot water and soap when washing dishes.
  • Tree roots naturally extend themselves in the ground to find nutrients which may cause significant damage and completely block pipes which can cause flooding. Ensure you maintain the trees surrounding drainage systems by trimming them.
  • The flushing of non-biodegradable products like wet wipes, towels, etc. can create unpleasant smells emanating from bins and toilets. just take care to wash your toilet paper in the drain.
  • Hair

In this article, we will examine five of the most common reasons for blocked drains and the best way to stop them from happening.

Cause 1. Grease, oil and Fat Buildup

Fat, grease, and oil may seem like harmless substances to drain down the toilet, but as time passes, they build up within the wall of pipes, creating the pipes to become blocked. If this happens then water cannot flow freely through the drainpipes. The solution is to stop the practice of pouring grease in the drain, or make use of hot water and soap during cleaning dishes because it assists to break down grease-based substances.

Cause 2. Tree Roots

Over time tree roots naturally extend themselves into the ground seeking nutrients. This results in them growing toward underground pipes. Once inside these pipes tree roots can cause massive damage and could completely block them, leading to flooding. It is therefore essential if you have trees around to regularly monitor the growth of your trees around drainage systems by trimming them regularly.

Cause 3: Item that has been thrown away

It’s not difficult to conclude that flushing items that aren’t biodegradable like wet wipes, sanitary towels etc. aren’t likely to cause major issues in the end, however, if too many of these items go into toilets, they can build up, pushing other items aside and blocking pipes – this can result in nasty smells emanating around bins and toilets! Always be aware of what should be flushed and what shouldn’t (i. it is only toilet papers should be flushed).

Cause 4 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 Blocked Drains Plumbers now and speak to one of our friendly team members.

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