5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Melbourne Blocked Drains Plumber on 19 Feb 2026

Blocked drains are a source of frustration that can disrupt your daily life. They can lead to water damage, bad smells, or even health risks. If they are not addressed promptly blocked drains can lead to grave problems to your plumbing system, leading to expensive maintenance or repairs.

Key Takeaways

  • Blockages to drains can cause disruption to your routine and can cause water damage, bad odours and even health hazards.
  • Grease, oil and fat accumulations can stick to the pipes’ walls, causing blockages. Avoid pouring grease down the drain, or make use of hot water and soap for cleaning dishes.
  • Tree roots naturally grow into the soil to search for nutrients which may cause significant damage to pipes and even completely block them which can cause flooding. Ensure you maintain trees near drainage systems by pruning them.
  • Wet towels, wipes and sanitary pads and so on. could cause unpleasant odors that can be detected around bins and toilets; only flush toilet paper down the drain.
  • Hair

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

Cause 1. Grease, oil and fat buildup

Grease, oil and fat could appear as harmless substances to flush down the drain, however, over time, they begin to accumulate over the insides of pipes causing an obstruction. As a result the water can’t flow freely through drainpipes. The solution is to stop throwing grease in the drain, or use soap and hot water when cleaning dishes because it assists to dissolve greasy substances.

Cause 2: Tree Roots

Over time tree roots naturally extend themselves into the ground seeking nutrients. This results in them growing toward underground pipes. Once they’re inside, the trees roots can cause a lot of damage and can completely stop them from flowing, causing 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 the trees regularly.

Cause 3: Items that are soiled

It’s easy to assume that flushing non-biodegradable items like wet wipes, sanitary towels etc. aren’t likely to cause major issues in the long term, However, if a large amount of these items are put in toilets, they’ll in the accumulation of other items, thereby which can result in nasty smells emanating around the toilets and bins too! Make sure to remember what should be flushed, and what shouldn’t (i. e 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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