5 Common Causes of Blocked Drains and How to Prevent Them

Posted by Perth Blocked Drains Plumber on 7 Dec 2025

Blocked drains are an inconvenience that could disrupt your everyday life. They can result in the destruction of your home’s plumbing, unpleasant smells, and even health risks. If they’re not treated promptly blocked drains may cause serious problems in the plumbing system, which could lead to expensive fixes or replacings.

Key Takeaways

  • Drains that are blocked can interrupt your routine and result in flooding, unpleasant smells, and even health issues.
  • Grease, oil and fat build-up can clog the walls of pipes, leading to blockages. Do not pour grease down the drain, or use hot water and soap for cleaning dishes.
  • Tree roots naturally grow in the ground to find nutrients that could cause severe damage to pipes and even completely block them and cause flooding. It is important to regularly maintain trees near drainage systems by trimming them.
  • Disposing of non-biodegradable materials like wet towels, wipes and sanitary pads and so on. can result in nasty smells that can be detected around bins and toilets; just take care to wash your toilet paper in the drain.
  • Hair

In this post, we’ll examine five of the most common causes of blocked drains and how you can avoid them.

Cause 1: Grease, Oil and Fat buildup

Fat, grease and oil may seem like harmless substances to dump down the drain but over time they accumulate on the walls of pipes causing a blockage. In this case the water can’t flow freely through drainpipes. The best solution is to refrain from the practice of pouring grease into the drain. Alternatively, utilize soap and hot water while cleaning dishes as it helps break down grease-based substances.

Cause 2. Tree Roots

The tree’s roots gradually expand into the soil seeking nutrients. This leads to them expanding toward underground pipes. Once they’re inside, the tree roots can cause massive damage and may completely block them, leading to flooding. It’s important therefore if you are near trees to maintain the growth of your trees around drainage systems by trimming them in a regular manner.

Cause 3: Flushed items

It’s easy enough to believe that flushing items that aren’t biodegradable like the wet wipes, sanitary towel and so on. will not cause any major problems in the end, However, when a lot of these items go in toilets, they’ll accumulate pushing others aside blocking pipes – this 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. the only toilet paper should 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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