5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Perth Blocked Drains Plumbers on 7 Nov 2025

Blocked drains are an inconvenience which can cause a disruption in your daily life. They can cause flooding, bad smells, and even health hazards. If not promptly dealt with blocked drains can lead to grave problems to the plumbing system, which can lead to costly repairs or replacements.

Key Takeaways

  • The blockage of drains can affect your routine and cause flooding, unpleasant smells and even health dangers.
  • Fat, oil and grease build-up can clog the walls of pipes, leading to blockages; avoid pouring grease down the drain or make use of hot water and soap while cleaning dishes.
  • Tree roots naturally extend themselves into the soil to search for nutrients. This can cause massive damage, and also block the pipes completely which can cause flooding. Ensure you maintain the trees surrounding drainage systems by trimming them.
  • Disposing of non-biodegradable materials like wet towels, wipes and sanitary pads and so on. can cause unpleasant smells emanating around toilets/bin areas; make sure to wash toilet papers down toilet.
  • Hair

In this post, 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 may seem like harmless substances to pour down the drain however, over time, they begin to accumulate within the wall of pipes, which causes a blockage. As a result, water is unable to move freely through the drainpipes. The solution is to avoid throwing grease into the drain. Alternatively, utilize soap and hot water when cleaning dishes because it assists to break down grease-based substances.

Cause 2. Tree Roots

In time, the tree roots naturally expand into the soil seeking nutrients. This leads to them expanding towards underground pipes. Once they are inside the pipes, tree roots can cause massive damage and may completely block them leading to flooding. It’s important therefore if you are near trees that you maintain the growth of your trees around drainage systems by trimming them regularly.

Cause 3: Item that has been thrown away

It’s easy to assume that flushing biodegradable products such as toilet paper, wet wipes etc. won’t cause any significant problems in the end, However, if a large amount of these items are flushed into toilets, they can accumulate pushing others aside that block pipes. This can result in nasty smells emanating in the vicinity of toilets or bins! Always be aware of what should be flushed, and what shouldn’t (i. that 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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