5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Sydney Blocked Drains Plumbing on 29 Dec 2025

Blocked drains can be a nuisance that could cause disruption to your daily life. They can cause flooding, bad smells, or even health hazards. If they are not addressed promptly blocked drains may cause serious problems in your plumbing system, leading to costly repair or even replacement.

Key Takeaways

  • Blocked drains can disrupt your day-to-day routine and lead to flooding, unpleasant smells, and even health risks.
  • Oil, grease and fat accumulations can stick to the pipes’ walls causing blockages. Do not pour grease down the drain or make use of hot water and soap for cleaning dishes.
  • The roots of trees naturally expand into the ground searching for nutrients that could cause severe damage, and also block the pipes completely and cause flooding. It is important to regularly keep trees in the vicinity of drainage systems by pruning them.
  • Disposing of non-biodegradable materials like wet towels, wipes and sanitary pads and so on. could cause unpleasant odors emanating from bins and toilets. make sure to wash toilet papers down toilet.
  • Hair

In this post, we’ll look at five common causes of blocked drains and what you can do to avoid them.

Cause 1. Grease, oil and Fat buildup

Oil, grease, and fat could appear as harmless substances to dump down the drain but they can build up over the insides of the pipes, which causes obstruction. In this case the water can’t flow freely through the drainpipes. The best solution is to refrain from pouring grease down the drain. Or use hot water and soap to wash your hands when cleaning dishes because it assists to remove greasy substances.

Cause 2. Tree Roots

The tree’s roots gradually expand into the soil looking for nutrients. This leads to them expanding toward underground pipes. Once inside these pipes tree roots could cause significant damage and could completely stop them from flowing, causing flooding. Therefore, it is essential that if have trees around that you regularly maintain their growth 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 etc. will not cause any major problems in the end, However, when a lot of these products are flushed in toilets, they’ll pile up and push others away, that block pipes. This can cause unpleasant odors to emanate around bins and toilets! Make sure to remember what should be flushed and what shouldn’t (i. it is 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 Blocked Drains Plumbing now and speak to one of our friendly team members.

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