5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Blocked Drains Plumbing Sydney on 29 Oct 2025

Blocked drains are an inconvenience which can cause a disruption in your daily life. They can cause smelly water damage, bad smells and even health hazards. If they’re not treated promptly blocked drains may cause serious issues in your plumbing system, resulting in costly repair or even replacement.

Key Takeaways

  • Blocked drains can disrupt your daily life and result in flooding, unpleasant smells, and even health risks.
  • Fat, oil and grease accumulations can stick to the pipes’ walls, causing obstructions; try not to pour grease down the drain or use hot water and soap when washing dishes.
  • Tree roots naturally extend into the soil to search for nutrients, which could cause serious damage and completely block pipes leading to flooding; regularly keep trees in the vicinity of drainage systems by pruning them.
  • Flushing non-biodegradable items like wet towels, wipes and sanitary pads and so on. could cause unpleasant odors emanating from toilets or bins. only take care to wash your toilet paper in the drain.
  • Hair

In this post, we’ll explore five reasons for blocked drains and how you can keep them from happening.

Cause 1. Grease, oil and Fat buildup

Oil, grease, and fat may appear like harmless materials to flush down the drain, but as time passes, they build up on the walls of the pipes, causing the pipes to become blocked. As a result, water is unable to move freely through the drainpipes. The best solution is to refrain from throwing grease down the drain. Or use hot water and soap while cleaning dishes since it can help break down grease-based substances.

Cause 2: Tree Roots

As time passes, tree roots naturally extend themselves into the ground seeking nutrients. This implies that they expand toward underground pipes. Once they’re inside, the tree roots can cause substantial damage and even block them, causing flooding. It’s important therefore if you have trees around to maintain the growth of your trees around drainage systems, by trimming them regularly.

Cause 3: Items that are soiled

It’s easy enough to believe that flushing items that aren’t biodegradable like the wet wipes, sanitary towel and so on. shouldn’t cause a lot of problems in the long term, However, if a large amount of these items are flushed into toilets, they can build up, pushing other items aside and 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 be flushed out).

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 Plumbing Sydney now and speak to one of our friendly team members.

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We’re here to help with all of your plumbing needs, such as blocked drains, CCTV drain inspections, drain repairs and pipe relining.

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