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 which can cause a disruption in your daily life. They can result in water damage, bad smells, and even health hazards. If they’re not treated promptly blocked drains may cause grave problems to the plumbing system, which can lead to expensive fixes or replacings.

Key Takeaways

  • Drains that are blocked can interrupt your routine and can cause problems with water, bad smells, and even health risks.
  • Grease, oil and fat buildup can accumulate on the pipes’ walls, causing blockages. Avoid pouring grease down drains or use hot water and soap when washing dishes.
  • Tree roots naturally extend themselves into the soil to search for nutrients. This can cause massive damage, and also block the pipes completely leading to flooding; regularly maintain trees near drainage systems by trimming them.
  • Flushing non-biodegradable items like wet towels, wipes and sanitary pads and so on. can result in nasty smells emanating from toilets or bins. be sure to use toilet paper to flush down 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

Oil, grease, and fat may seem like harmless substances to flush down the drain, but over time they accumulate within the wall of pipes causing obstruction. When this occurs it is impossible for water to move freely through the drainpipes. It is best to avoid spilling grease down the drain. Or use soap and hot water when cleaning dishes because it assists to break down greasy substances.

Cause 2: Tree Roots

In time, the tree roots naturally extend into the ground looking for nutrients. This means that they grow toward underground pipes. Once they are inside the pipes, trees roots can cause a lot of damage and may completely stop them from flowing, causing flooding. It’s crucial, therefore, if you have trees nearby to regularly monitor their growth around drainage systems, by trimming them regularly.

Cause 3: Flushed items

It’s easy to think that flushing biodegradable products such as wet towels, sanitary wipes etc. aren’t likely to cause major issues in the long run however, if too many of these products are flushed down toilets they will resultantly build up, pushing other items aside and that block pipes. This can cause unpleasant odors to emanate around the toilets and bins too! Make sure to remember what should be flushed, and what shouldn’t (i. it is only toilet papers should be flushed out).

Cause 4: Hair

Additional Information

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