5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Sydney Blocked Drains Plumbing on 29 Dec 2025

Blocked drains can be a nuisance that could disrupt your everyday life. They can lead to the destruction of your home’s plumbing, unpleasant smells and even health hazards. If not promptly dealt with, blocked drains can cause serious issues in the plumbing system, which can lead to costly maintenance or repairs.

Key Takeaways

  • Blockages to drains can cause disruption to your daily life and result in water damage, bad smells and even health dangers.
  • The fat, oil and grease build-up can clog the pipes’ walls, causing blockages. Avoid pouring grease down the drain. Alternatively, make use of hot water and soap when washing dishes.
  • The roots of trees naturally expand in the ground to find nutrients that could cause severe damages and blockages to pipes which can cause flooding. Ensure you maintain trees near drainage systems by pruning them.
  • The flushing of non-biodegradable products like wet toiletries, wipes, and so on. can result in nasty smells that can be detected around bins and toilets; make sure to flush toilet paper down the drain.
  • Hair

In this post, we’ll review five common reasons for blocked drains and how you can stop them from happening.

Cause 1. Grease, oil and Fat buildup

Grease, oil and fat may seem like harmless substances to pour down the drain however, over time, they begin to accumulate on the walls of the pipes causing a blockage. If this happens it is impossible for water to flow freely through the drainpipes. The best solution is to refrain from throwing grease in the drain, or make use of hot water and soap during cleaning dishes because it assists to break down greasy substances.

Cause 2: Tree Roots

In time, the tree roots naturally extend their roots into the earth seeking nutrients. This leads to them expanding toward underground pipes. Once they’re inside, the trees roots can cause a lot of damage and can completely block them, causing flooding. It is therefore essential if you have trees nearby to regularly monitor their growth around drainage systems by pruning them on a regular basis.

Cause 3: Items that are soiled

It’s easy enough to believe that flushing non-biodegradable things like toilet paper, wet wipes and so on. shouldn’t cause a lot of problems over the long haul, However, if a large amount of these items go in the toilets, they’ll pile up and push others away, blocking pipes – this can cause unpleasant odors to emanate around toilets/bin areas too! Always be aware of what should be flushed and what shouldn’t (i. it is only toilet paper should be flushed away).

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 Sydney cleared today, contact Sydney Blocked Drains Plumbing now and speak to one of our friendly team members.

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When it comes to plumbing, you want to make sure you’re working with a qualified professional. At our company, we are licensed and insured professionals who are dedicated to providing quality plumbing services.

We’re here to help with all of your plumbing needs, such as blocked drains, CCTV drain inspections, drain repairs and pipe relining.

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