5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Melbourne Blocked Drains Plumbers on 9 Nov 2025

Blocked drains can be a nuisance that could disrupt your everyday life. They could cause the destruction of your home’s plumbing, unpleasant smells, or even health risks. If they’re not treated promptly blocked drains may cause grave problems to the plumbing system, which can lead to costly repair or even replacement.

Key Takeaways

  • Blockages to drains can cause disruption to your routine and can result in flooding, unpleasant smells, and even health issues.
  • Fat, oil and grease accumulation can build up on the walls of pipes causing blockages. Avoid pouring grease down the drain or use hot water and soap while cleaning dishes.
  • Tree roots naturally grow into the ground searching for nutrients, which could cause serious damages and blockages to pipes that can lead to flooding. Regularly maintain the trees surrounding drainage systems by pruning them.
  • The flushing of non-biodegradable products like wet wipes, towels, etc. can cause unpleasant smells emanating from toilets or bins. be sure to take care to wash your toilet paper in the drain.
  • Hair

In this post, we’ll look at five common causes of blocked drains and what you can do to keep them from happening.

Cause 1. Grease, oil and Fat Buildup

Fat, grease, and oil could appear as harmless substances to flush down the drain, but over time they accumulate within the wall of the pipes, causing a blockage. In this case then water cannot flow freely through the drainpipes. The best solution is to refrain from pouring grease down the drain. Or utilize soap and hot water when cleaning dishes as it helps break down greasy substances.

Cause 2. Tree Roots

Over time tree roots naturally expand into the soil looking for nutrients. This leads to them expanding towards underground pipes. Once they are inside the pipes, tree roots can cause substantial damage and can completely block them leading to flooding. Therefore, it is essential that if have trees in the vicinity that you regularly maintain the growth of your trees in the drainage system by trimming them on a regular basis.

Cause 3: Items that are soiled

It’s easy to assume that flushing items that aren’t biodegradable like toilet paper, wet wipes etc. aren’t likely to cause major issues in the end, However, when a lot of these products are flushed in toilets, they’ll in the accumulation of other items, thereby which can cause a bad smell to be released in the vicinity of toilets or bins! Always be aware of what should be flushed away and what should not (i. that only toilet paper is 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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