5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Sydney Plumber Blocked Drains on 26 Oct 2025

Blocked drains are a source of frustration that could disrupt your everyday life. They can result in the destruction of your home’s plumbing, unpleasant odours, and even health hazards. If they are not addressed promptly blocked drains could cause grave problems to the plumbing system, which can lead to expensive fixes or replacings.

Key Takeaways

  • Drains that are blocked can interrupt your daily life and cause flooding, unpleasant smells, and even health risks.
  • Fat, oil and grease accumulation can build up on the pipes’ walls, causing blockages. Avoid pouring grease down the drain, or use soap and hot water when washing dishes.
  • The roots of trees naturally expand into the ground searching for nutrients that could cause severe damage to pipes and even completely block them leading to flooding; regularly keep trees in the vicinity of drainage systems by pruning them.
  • Flushing non-biodegradable items like wet wipes, sanitary towels and so on. can result in nasty smells emanating from toilets or bins. make sure to take care to wash your toilet paper in the toilet.
  • Hair

In this article, we will explore five causes of blocked drains and what you can do to stop them from happening.

Cause 1. Grease, Oil and Fat buildup

Fat, grease and oil may seem like harmless substances to flush down the drain, but they can build up over the insides of the pipes, causing obstruction. If this happens then water cannot flow freely through drainpipes. The solution is to stop spilling grease down the drain or make use of hot water and soap during cleaning dishes as it helps break down greasy substances.

Cause 2: Tree Roots

In time, the tree roots naturally expand into the soil in search of nutrients, which implies that they expand towards underground pipes. Once they are inside the pipes, trees roots can cause a lot of damage and could completely stop them from flowing, causing flooding. It’s important therefore if you have trees nearby to regularly monitor their growth around drainage systems by pruning them in a regular manner.

Cause 3: Flushed items

It’s easy to think that flushing non-biodegradable items like wet towels, sanitary wipes and so on. aren’t likely to cause major issues over the long haul, However, if a large amount of these items go in the toilets, they’ll pile up and push others away, in the way of pipes. This could cause a bad smell to be released around the toilets and bins too! Always remember what should be flushed and what shouldn’t (i. the only toilet paper should be flushed away).

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 Sydney Plumber Blocked Drains now and speak to one of our friendly team members.

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