5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Perth Blocked Drains Plumbers on 7 Nov 2025

Blocked drains can be a nuisance which can cause a disruption in your daily life. They can result in the destruction of your home’s plumbing, unpleasant smells and even health hazards. If they are not addressed promptly, blocked drains can cause serious issues in your plumbing system, resulting in expensive maintenance or repairs.

Key Takeaways

  • The blockage of drains can affect your day-to-day routine and lead to the destruction of your home, bad smells, and even health risks.
  • The fat, oil and grease accumulations can stick to the walls of pipes causing obstructions; try not to pour grease down drains or use hot water and soap to wash dishes.
  • The roots of trees naturally expand in the ground to find nutrients, which could cause serious damage to pipes and even completely block them leading to flooding; regularly keep trees in the vicinity of drainage systems by pruning them.
  • Flushing non-biodegradable items like wet towels, wipes and sanitary pads etc. can create unpleasant smells that can be detected around bins and toilets; make sure to wash toilet papers down toilet.
  • Hair

In this article, we’ll examine five of the most 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 as time passes, they build up over the insides of pipes, which causes an obstruction. As a result then water cannot move freely through the drainpipes. The solution is to avoid throwing grease down the drain. Or utilize soap and hot water while cleaning dishes, as this helps dissolve greasy substances.

Cause 2: Tree Roots

Over time tree roots naturally extend their roots into the earth searching for nutrients which leads to them expanding towards underground pipes. Once inside the pipes, tree roots can cause massive damage and can completely block them, leading to flooding. It’s important therefore if you are near trees that you maintain their growth in the drainage system by trimming them in a regular manner.

Cause 3: Item that has been thrown away

It’s easy to assume that flushing items that aren’t biodegradable like the wet wipes, sanitary towel etc. shouldn’t cause a lot of problems in the end, but when too many of these items are put down toilets they will resultantly accumulate pushing others aside which can cause unpleasant odors to emanate around bins and toilets! Always remember what should be flushed, and what shouldn’t (i. that only toilet papers should have to be flushed).

Cause 4 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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Clearing blocked drains can be difficult and it’s best to get a professional plumbing service involved to tackle it for you, To get your blocked drain in Perth cleared today, contact Perth Blocked Drains Plumbers now and speak to one of our friendly team members.

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