5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Perth Blocked Drains Plumber on 12 Oct 2026

Blocked drains can be a nuisance that could disrupt your everyday life. They could cause smelly water damage, bad smells, or even health hazards. If they’re not treated promptly blocked drains could cause severe problems for the plumbing system, which could lead to costly maintenance or repairs.

Key Takeaways

  • Blockages to drains can cause disruption to your routine and can cause water damage, bad smells, and even health risks.
  • The fat, oil and grease accumulations can stick to the walls of pipes, leading to blockages; avoid pouring grease down the drain, or use hot water and soap to wash dishes.
  • Tree roots naturally extend into the earth to seek nutrients, which could cause serious damage to pipes and even completely block them that can lead to flooding. Regularly maintain the trees surrounding drainage systems by trimming them.
  • Wet wipes, sanitary towels and so on. can result in nasty smells emanating from toilets or bins. just wash toilet papers down toilet.
  • Hair

In this article, we will examine five of the most common causes of blocked drains and what you can do to prevent them from happening.

Cause 1. Grease, oil and Fat Buildup

Fat, grease, and oil may seem like harmless substances to drain down the toilet, but as time passes, they build up on the walls of pipes, which causes obstruction. In this case the water can’t move freely through the drainpipes. The solution is to stop throwing grease in the drain, or utilize soap and hot water during cleaning dishes because it assists to break down greasy substances.

Cause 2: Tree Roots

Over time tree roots naturally extend their roots into the earth searching for nutrients which means that they grow towards underground pipes. Once they are inside the pipes, trees roots can cause a lot of damage and may completely block them, causing flooding. It’s crucial, therefore, if you have trees in the vicinity that you maintain their growth around drainage systems by pruning them regularly.

Cause 3: Flushed items

It’s easy to assume that flushing non-biodegradable things like the wet wipes, sanitary towel etc. shouldn’t cause a lot of problems in the long run but when too many of these products are flushed down toilets they will resultantly build up, pushing other items aside and which can cause a bad smell to be released around toilets/bin areas too! Always be aware of what should be flushed away and what should not (i. the only toilet paper is to be flushed out).

Cause 4: Hair

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