5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Perth Blocked Drains Plumbers on 7 Nov 2025

Blocked drains are a hassle that can disrupt your daily life. They could cause smelly water damage, bad smells and even health hazards. If not promptly dealt with blocked drains may cause serious problems in the plumbing system, resulting in expensive fixes or replacings.

Key Takeaways

  • Drains that are blocked can interrupt your routine and lead to water damage, bad smells, and even health risks.
  • Grease, oil and fat buildup can accumulate on the walls of pipes causing obstructions; try not to pour grease down the drain or use soap and hot water to wash dishes.
  • The roots of trees naturally expand into the ground searching for nutrients, which could cause serious damage to pipes and even completely block them which can cause flooding. Ensure you maintain trees near drainage systems by pruning them.
  • The flushing of non-biodegradable products like wet wipes, towels, and so on. can create unpleasant smells that can be detected around bins and toilets; just flush toilet paper down the drain.
  • Hair

In this article, we will look at five common reasons for blocked drains and the best way to prevent them from happening.

Cause 1. Grease, oil and Fat buildup

Oil, grease, and fat may seem like harmless substances to flush down the drain, but over time they accumulate in the pipes’ walls the pipes, creating a blockage. As a result then water cannot flow freely through drainpipes. The solution is to avoid the practice of pouring grease down the drain. Or make use of hot water and soap to wash your hands when cleaning dishes as it helps break down grease-based substances.

Cause 2. Tree Roots

As time passes, tree roots naturally expand into the soil seeking nutrients. This leads to them expanding towards underground pipes. Once inside these pipes tree roots can cause massive damage and could completely block them, leading to flooding. It is therefore essential if you have trees in the vicinity to regularly monitor the growth of your trees in the drainage system by trimming them in a regular manner.

Cause 3: Unwanted items

It’s easy enough to believe that flushing items that aren’t biodegradable like the wet wipes, sanitary towel and so on. aren’t likely to cause major issues over the long haul, However, if a large amount of these products are flushed in the toilets, they’ll accumulate pushing others aside in the way of pipes. This could cause unpleasant odors to emanate around bins and toilets! Always be aware of what should be flushed away and what should not (i. that only toilet paper needs to be flushed away).

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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