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 source of frustration that could disrupt your everyday life. They can cause smelly water damage, bad odours, and even health risks. If not promptly dealt with blocked drains can lead to serious problems in the plumbing system, which could lead to costly repairs or replacements.

Key Takeaways

  • Blocked drains can disrupt your routine and cause water damage, bad odours and even health hazards.
  • Oil, grease and fat accumulations can stick to the walls of pipes causing obstructions; try not to pour grease down the drain, or make use of hot water and soap when washing 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 the trees surrounding drainage systems by pruning them.
  • Disposing of non-biodegradable materials like wet wipes, towels, etc. can result in nasty smells emanating from bins and toilets. only use toilet paper to flush down toilet.
  • 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

Grease, oil and fat could appear as harmless substances to flush down the drain, but over time they accumulate within the wall of the pipes, creating obstruction. In this case the water can’t flow freely through the drainpipes. The solution is to avoid pouring grease into the drain. Alternatively, utilize soap and hot water while cleaning dishes as it helps break down greasy substances.

Cause 2: Tree Roots

In time, the tree roots naturally extend their roots into the earth searching for nutrients which results in them growing towards underground pipes. Once inside the pipes, tree roots can cause substantial damage and may completely block them, causing flooding. Therefore, it is essential that if have trees in the vicinity that you regularly maintain the growth of your trees around drainage systems, by trimming them on a regular basis.

Cause 3: Unwanted items

It’s easy to assume that flushing items that aren’t biodegradable like wet towels, sanitary wipes and so on. shouldn’t cause a lot of problems in the long run however, if too many of these items are flushed in toilets, they’ll accumulate pushing others aside which can create unpleasant smells around bins and toilets! Make sure to remember what should be flushed and what shouldn’t (i. e only toilet paper is 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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