5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Perth Blocked Drains Plumber on 8 May 2026

Blocked drains can be a nuisance that can disrupt your daily life. They can result in the destruction of your home’s plumbing, unpleasant smells and even health risks. If not dealt with promptly blocked drains could cause serious problems in the plumbing system, which could lead to costly maintenance or repairs.

Key Takeaways

  • Blocked drains can disrupt your routine and cause water damage, bad odours and even health hazards.
  • Fat, oil and grease accumulations can stick to the pipes’ walls causing blockages; avoid pouring grease down the drain, or use hot water and soap while cleaning dishes.
  • Tree roots naturally extend themselves in the ground to find nutrients. This can cause massive damage to pipes and even completely block them which can cause flooding. Ensure you maintain trees near drainage systems by pruning them.
  • Disposing of non-biodegradable materials like wet towels, wipes and sanitary pads etc. could cause unpleasant odors that can be detected around bins and toilets; make sure to use toilet paper to flush down drain.
  • Hair

In this article, we’ll explore five reasons for blocked drains and how you can 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 over time they accumulate within the wall of pipes, creating a blockage. If this happens then water cannot flow freely through drainpipes. The solution is to stop throwing grease in the drain, or use soap and hot water during cleaning dishes because it assists to dissolve greasy substances.

Cause 2: Tree Roots

The tree’s roots gradually extend into the ground in search of nutrients, which means that they grow towards underground pipes. Once inside these pipes trees roots can cause a lot of damage and could completely block them leading to flooding. It’s crucial, therefore, if you have trees nearby that you regularly maintain the growth of your trees in the drainage system by trimming them in a regular manner.

Cause 3: Items that are soiled

It’s easy to assume that flushing non-biodegradable items like wet wipes, sanitary towels and so on. shouldn’t cause a lot of problems in the long term, However, if a large amount of these items are flushed down toilets they will resultantly in the accumulation of other items, thereby in the way of pipes. This could result in nasty smells emanating around bins and toilets! Be aware of what needs to be flushed, and what shouldn’t (i. the only toilet paper is to be flushed out).

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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