5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Blocked Drains Plumbing Sydney on 29 Oct 2025

Blocked drains are a source of frustration that could disrupt your everyday life. They can cause the destruction of your home’s plumbing, unpleasant smells, or even health risks. If not dealt with promptly blocked drains could cause severe problems for your plumbing system, which can lead to costly repairs or replacements.

Key Takeaways

  • Blockages to drains can cause disruption to your day-to-day routine and cause problems with water, bad smells, and even health risks.
  • Oil, grease and fat accumulations can stick to the walls of pipes causing blockages. Do not pour grease down the drain or use soap and hot water when washing dishes.
  • Tree roots naturally extend into the ground searching for nutrients that could cause severe damage and completely block pipes that can lead to flooding. Regularly maintain nearby trees around drainage systems by trimming them.
  • Flushing non-biodegradable items like wet wipes, towels, and so on. can result in nasty smells that can be detected around bins and toilets; be sure to flush toilet paper down the drain.
  • Hair

In this article, we will explore five reasons for blocked drains and what you can do to prevent them from happening.

Cause 1. Grease, Oil and Fat Buildup

Fat, grease and oil could appear as harmless substances to drain down the toilet, however, over time, they begin to accumulate on the walls of the pipes, creating an obstruction. In this case, water is unable to flow freely through the drainpipes. The best solution is to refrain from spilling grease down the drain or use soap and hot water when cleaning dishes because it assists to remove greasy substances.

Cause 2. Tree Roots

As time passes, tree roots naturally extend into the ground in search of nutrients, which implies that they expand towards underground pipes. Once they’re inside, the tree roots can cause substantial damage and can completely block them, causing flooding. Therefore, it is essential that if have trees nearby that you regularly maintain the growth of your trees around drainage systems, by trimming the trees regularly.

Cause 3: Flushed items

It’s not difficult to conclude that flushing biodegradable products such as the wet wipes, sanitary towel etc. will not cause any major problems over the long haul, However, when a lot of these products are flushed in the toilets, they’ll build up, pushing other items aside and which can cause unpleasant odors to emanate around the toilets and bins too! Make sure to remember what should be flushed and which shouldn’t (i. it is 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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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 Sydney cleared today, contact Blocked Drains Plumbing Sydney now and speak to one of our friendly team members.

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