Blocked drains are the single most common plumbing call-out in Melbourne. They’re also largely preventable — if you know what causes them.
The Most Common Causes of Blocked Drains in Melbourne
Tree Roots — Melbourne’s inner suburbs are lined with established trees. Tree roots are drawn to the moisture inside sewer and stormwater pipes. Inner Melbourne’s older clay and terracotta pipes (common in Fitzroy, Richmond, Collingwood, and Brunswick) are especially vulnerable.
Grease and Fat Buildup — Cooking oil poured down the sink solidifies as it cools, coating pipe walls and narrowing flow over time.
Hair in Bathroom Drains — Hair tangles around drain fittings and combines with soap scum to form a dense plug.
Foreign Objects — Wet wipes (even “flushable” ones), cotton pads, sanitary products, and dental floss are common culprits.
Collapsed or Damaged Pipes — Older Melbourne properties may have pipes that have deteriorated or shifted due to ground movement.
Soap Scum and Mineral Buildup — Over time, soap residue and mineral deposits coat the inside of pipes, reducing diameter.
Warning Signs of a Blocked Drain
Watch for: water draining slowly from any sink, bath, or shower; gurgling sounds from drains or toilets; water backing up in one fixture when another is used; unpleasant odours from drain openings; water pooling in your yard near the sewer inspection point. Any of these means something is blocking your drain system — don’t wait.
What Actually Works for Prevention
In the kitchen: Never pour cooking oil down the sink. Use a sink strainer to catch food scraps. Run hot water through the drain after washing dishes.
In the bathroom: Fit a hair catcher over every shower and bath drain. Clear it weekly. Use liquid soap instead of bar soap where possible.
In the toilet: Only flush toilet paper — nothing else. “Flushable” wet wipes do not break down adequately.
When to Call a Plumber
A plunger is fine for a simple surface blockage. Call a plumber if a plunger hasn’t cleared it after a couple of attempts, multiple drains are slow simultaneously, or there’s sewage smell from floor drains. See our blocked drain service →
Got a blocked drain right now? Call 0468 013 012 — available same day and 24/7 for emergencies across Melbourne.
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