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 cause disruption to your daily life. They can cause smelly water damage, bad smells, and even health hazards. If they are not addressed promptly, blocked drains can cause severe problems for your plumbing system, which could lead to costly repairs or replacements.

Key Takeaways

  • Drains that are blocked can interrupt your daily life and result in the destruction of your home, bad smells and even health dangers.
  • The fat, oil and grease accumulation can build up on the walls of pipes, leading to blockages. Avoid pouring grease down the drain, or make use of hot water and soap to wash dishes.
  • Tree roots naturally grow into the earth to seek nutrients that could cause severe damages and blockages to pipes leading to flooding; regularly maintain nearby trees around drainage systems by pruning them.
  • Wet wipes, towels, and so on. can create unpleasant smells that can be detected around bins and toilets; only wash toilet papers down toilet.
  • Hair

In this article, we will review five common reasons for blocked drains and what you can do to avoid them.

Cause 1. Grease, Oil and Fat Buildup

Fat, grease, and oil might appear to be harmless substances to drain down the toilet, however, over time, they begin to accumulate in the pipes’ walls the pipes causing a blockage. As a result then water cannot move freely through the drainpipes. The solution is to avoid the practice of pouring grease in the drain, or use soap and hot water to wash your hands when cleaning dishes since it can help dissolve greasy substances.

Cause 2. Tree Roots

Over time tree roots naturally extend themselves into the ground looking for nutrients. This leads to them expanding towards underground pipes. Once inside these pipes tree roots could cause significant damage and can completely block them, causing flooding. It is therefore essential if you have trees around that you regularly maintain the growth of your trees around drainage systems by pruning them on a regular basis.

Cause 3: Unwanted items

It’s easy to think that flushing biodegradable products such as the wet wipes, sanitary towel and so on. shouldn’t cause a lot of problems in the long term, However, when a lot of these items go down toilets they will resultantly accumulate pushing others aside blocking pipes – this can cause unpleasant odors to emanate in the vicinity of toilets or bins! Always be aware of what should be flushed and what shouldn’t (i. that only toilet paper 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 Blocked Drains Plumbers Sydney now and speak to one of our friendly team members.

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