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 could disrupt your everyday life. They can result in water damage, bad smells, or even health risks. If not promptly dealt with, blocked drains can cause serious issues in your plumbing system, which can lead to expensive repairs or replacements.

Key Takeaways

  • The blockage of drains can affect your routine and can cause the destruction of your home, bad smells, and even health risks.
  • Fat, oil and grease accumulations can stick to the walls of pipes causing blockages. Do not pour grease down drains or use soap and hot water when washing dishes.
  • Tree roots naturally extend in the ground to find nutrients. This can cause massive damage, and also block the pipes completely which can cause flooding. Ensure you keep trees in the vicinity of drainage systems by pruning them.
  • Disposing of non-biodegradable materials like wet towels, wipes and sanitary pads etc. could cause unpleasant odors that can be detected around bins and toilets; be sure to flush toilet paper down the toilet.
  • Hair

In this post, we’ll review five common causes of blocked drains and how you can prevent them from happening.

Cause 1. Grease, oil and Fat buildup

Oil, grease, and fat may seem like harmless substances to pour down the drain but over time they accumulate over the insides of pipes, which causes the pipes to become blocked. In this case then water cannot flow freely through drainpipes. It is best to avoid spilling grease down the drain. Or make use of hot water and soap during cleaning dishes because it assists to remove greasy substances.

Cause 2: Tree Roots

In time, the tree roots naturally extend into the ground seeking nutrients. This means that they grow towards underground pipes. Once they are inside the pipes, trees roots can cause a lot of damage and could completely block them leading to flooding. It is therefore essential if you have trees nearby to maintain their growth around drainage systems, by trimming them in a regular manner.

Cause 3: Flushed items

It’s not difficult to conclude that flushing biodegradable products such as wet wipes, sanitary towels and so on. won’t cause any significant problems in the end, but when too many of these items go in the toilets, they’ll pile up and push others away, which can result in nasty smells emanating around toilets/bin areas too! Make sure to remember what should be flushed and what shouldn’t (i. e only toilet paper is to 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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