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 which can cause a disruption in your daily life. They can result in flooding, bad smells, or even health risks. If not promptly dealt with blocked drains may cause serious issues in the plumbing system, leading to expensive repairs or replacements.

Key Takeaways

  • Drains that are blocked can interrupt your day-to-day routine and cause the destruction of your home, bad smells, and even health risks.
  • Oil, grease and fat build-up can clog the pipes’ walls causing obstructions; try not to pour grease down drains or use soap and hot water for cleaning dishes.
  • Tree roots naturally extend in the ground to find nutrients, which could cause serious damage to pipes and even completely block them and cause flooding. It is important to regularly maintain the trees surrounding drainage systems by trimming them.
  • Flushing non-biodegradable items like wet toiletries, wipes, and so on. could cause unpleasant odors emanating around toilets/bin areas; make sure to flush toilet paper down the drain.
  • Hair

In this article, we’ll review five common causes of blocked drains and ways to stop them from happening.

Cause 1: Grease, Oil and Fat buildup

Fat, grease, and oil might appear to be harmless substances to pour down the drain but they can build up within the wall of pipes, creating obstruction. When this occurs then water cannot flow freely through drainpipes. It is best to avoid throwing grease in the drain, or make use of hot water and soap while cleaning dishes since it can help break down greasy substances.

Cause 2: Tree Roots

As time passes, tree roots naturally extend their roots into the earth looking for nutrients. This leads to them expanding towards underground pipes. Once they are inside the pipes, trees roots can cause a lot of damage and may completely block them, leading to flooding. It is therefore essential if you have trees nearby that you maintain the growth of your trees around drainage systems by pruning the trees regularly.

Cause 3: Flushed items

It’s easy enough to believe that flushing items that aren’t biodegradable like the wet wipes, sanitary towel and so on. will not cause any major problems in the long run However, when a lot of these products are flushed down toilets they will resultantly build up, pushing other items aside and that block pipes. This can cause a bad smell to be released around the toilets and bins too! Always remember what should be flushed and what shouldn’t (i. it is only toilet paper needs 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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