“Blocked drain” covers a wide range of situations — from a slow bath drain to a backyard full of sewage. The distinction between a blocked drain and a blocked sewer matters because the urgency, the repair method, and the cost are completely different.
What’s the Difference?
A blocked drain is a localised blockage in a single fixture’s waste pipe — it typically affects only that fixture. A blocked sewer is a blockage in the main sewer line that serves your entire property. A sewer blockage affects multiple fixtures simultaneously. Think of it like this: a blocked drain is one lane of traffic stopped. A blocked sewer is the whole motorway.
How to Tell Which One You Have
One slow fixture (e.g. the shower drains slowly) → Likely a blocked drain, localised to that fixture.
Multiple fixtures draining slowly at the same time → Likely a sewer blockage.
Flushing the toilet causes water to rise in the shower or bath → Sewer blockage — water is backing up through the lowest fixture.
Sewage smell from floor drains or yard → Sewer blockage or overflow — urgent.
Gurgling sounds from multiple drains when one fixture is used → Sewer or shared branch line partially blocked.
Who’s Responsible: You or Melbourne Water?
The property owner is responsible for the sewer drain from the house to the point of connection with the Melbourne Water network — typically at or near the property boundary. Melbourne Water is responsible for the main sewer beyond that point. A licensed plumber with CCTV capability can identify exactly where the blockage is.
Common Causes of Sewer Blockages in Melbourne
Tree root intrusion is the leading cause in Melbourne’s established suburbs. Older clay sewer pipes (common in inner-city suburbs built before the 1970s) are especially vulnerable. Grease accumulation gradually narrows the pipe. Foreign objects accumulating at a partial restriction. Collapsed pipe sections in older properties.
How Urgent Is a Sewer Blockage?
Very. If you’re seeing multi-fixture symptoms, call same-day. If sewage is actively overflowing: stop using all water immediately and call immediately.
Sedcon Plumbing clears blocked drains and sewer lines across Melbourne — same day in most cases. Call 0468 013 012 or see our blocked drain service →