5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Blocked Drains Plumbers Sydney on 10 Oct 2025

Blocked drains are a hassle that could disrupt your everyday life. They can lead to flooding, bad odours, and even health risks. If not dealt with promptly, blocked drains can cause serious problems in your plumbing system, which could lead to costly repairs or replacements.

Key Takeaways

  • Blockages to drains can cause disruption to your routine and can lead to the destruction of your home, bad smells and even health dangers.
  • The fat, oil and grease accumulations can stick to the pipes’ walls, causing blockages. Avoid pouring grease down drains or use soap and hot water when washing dishes.
  • Tree roots naturally extend themselves in the ground to find nutrients that could cause severe damage, and also block the pipes completely which can cause flooding. Ensure you maintain trees near drainage systems by pruning them.
  • The flushing of non-biodegradable products like wet wipes, towels, and so on. can cause unpleasant smells emanating around toilets/bin areas; just take care to wash your toilet paper in the drain.
  • Hair

In this article, we’ll examine five of the most common reasons for blocked drains and the best way to avoid them.

Cause 1: Grease, Oil and fat buildup

Oil, grease, and fat might appear to be harmless substances to pour down the drain however, over time, they begin to accumulate in the pipes’ walls the pipes, creating a blockage. When this occurs it is impossible for water to flow freely through the drainpipes. It is best to avoid the practice of pouring grease down the drain or utilize soap and hot water when cleaning dishes since it can help remove greasy substances.

Cause 2: Tree Roots

Over time tree roots naturally extend into the ground seeking nutrients. This results in them growing towards underground pipes. Once they’re inside, the tree roots could cause significant damage and even block them, causing flooding. It’s important therefore if you have trees in the vicinity that you regularly maintain the growth of your trees in the drainage system by trimming them regularly.

Cause 3: Flushed items

It’s not difficult to conclude that flushing non-biodegradable items like toilet paper, wet wipes and so on. won’t cause any significant problems over the long haul, but when too many of these products are flushed in toilets, they’ll build up, pushing other items aside and blocking pipes – this can result in nasty smells emanating around the toilets and bins too! Always be aware of what should be flushed and what shouldn’t (i. the only toilet paper is to have to 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 Blocked Drains Plumbers Sydney now and speak to one of our friendly team members.

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