Blocked Drain FAQs
Direct answers, grouped by what you are trying to work out: what is wrong, what to do about it, and what happens next. Each answer links to the page that covers it properly.
Working out what is wrong
Start here if you are still identifying the problem.
What are the signs of a blocked main drain?
The defining sign is several fixtures misbehaving at once rather than one. Look for a toilet that rises, bubbles or gurgles when a shower or washing machine runs, more than one fixture draining slowly at the same time, gurgling from one drain when a different one is used, and waste water discharging from an overflow gully outside. Any of those points at the shared drain rather than at an individual fixture.
Why do my drains keep blocking?
A repeat blockage in the same location almost always means the cause is still there. The usual candidates are roots entering through a cracked or open joint, a section of pipe that has cracked or shifted, or a sag holding water and solids instead of carrying them away. Clearing restores flow but does not change the pipe, so the same thing happens again. If the gap between blockages is shrinking, that is the clearest signal that something structural is involved.
What is the difference between a sewer blockage and a stormwater blockage?
They are separate pipe systems. The sanitary sewer drain carries waste water from toilets, sinks, showers and laundries. The stormwater system carries rain from roofs, gutters and paved areas. Two questions tell them apart: does the problem only happen when it rains, and is any waste water involved? Rain-only with no waste water is stormwater. Waste water backing up, whatever the weather, is the sanitary drain. Work done on one system does nothing for the other.
Can tree roots cause recurring blockages?
Yes, and they are one of the most common reasons a drain blocks repeatedly in the same spot. Roots grow toward moisture and enter through an existing defect — a crack, an open joint, a displaced section — then keep growing inside the pipe where they catch everything that passes. Clearing removes the roots but not the opening they came through, so they return. Ending the cycle means repairing the defect, which first means locating it.
Covered in more depth on blocked sewer drains and blocked stormwater drains.
Methods and equipment
What the common tools do, and where each one stops being the right answer.
When is a CCTV drain inspection useful?
The clearest case is a drain that has blocked more than once in the same place, because that pattern is evidence the pipe itself is contributing. It is also useful before authorising any repair work, when a blockage cleared unusually hard, and when buying a property with mature trees or older drainage. It is generally not necessary for a straightforward one-off blockage that cleared easily.
Does high pressure jetting damage pipes?
Used appropriately on a sound pipe, jetting is a normal clearing and maintenance method. The risk sits with pipes that are already compromised — cracked, displaced, corroded or badly jointed. That is the argument for inspecting first where there is reason to suspect the pipe is in poor condition, rather than assuming it is fine and finding out afterwards.
Is a jetter better than a drain snake?
Neither is universally better. A jetter uses water to cut through a blockage and scour build-up off the pipe wall, which suits grease, silt and sludge. A cable machine can grip, cut and pull things that water cannot move, and it can be more practical on some access arrangements. They are different tools with overlapping uses, and the right choice depends on what is in the pipe and what condition the pipe is in.
Should the drain be cleared before or after a camera inspection?
Usually the line has to be flowing before an inspection produces anything useful, because a camera cannot see through a full pipe. The common sequence is to clear enough to restore flow, then inspect to establish why it blocked. Where a pipe is suspected to be fragile, that order sometimes changes.
Covered in more depth on high pressure drain jetting and CCTV drain inspections.
Responsibility, price and what to do now
The practical questions that come up around the work rather than in the pipe.
Who is responsible if the blockage is in the public sewer?
Responsibility generally divides according to where the blockage is: drainage on the property is maintained differently from the public sewer network beyond it. Because the specific arrangement is set by current local policy and can change, the practical step is to establish where the blockage actually is — which a camera inspection can help with — and to check the current published position rather than relying on a general rule.
What information should I have ready when I call?
Which fixtures are affected and which are not; whether the problem only appears when it rains; when it started; whether it has happened before and roughly how long ago; whether anything has surfaced outside; and where the drain access point is, if you know. Access details like gates, dogs and parking are worth mentioning too.
How is the price of a blocked drain job determined?
No pricing is published on this site, because none has been verified. What can be said generally is which factors move it: how accessible the drain is, how much of the line needs to be worked, what is causing the blockage, whether diagnostic work is involved, and whether the visit is during ordinary hours. Ask for the basis of a price before work starts rather than after.
What should I stop doing while I wait for someone?
If waste water is backing up or surfacing, stop using water everywhere on the property — no flushing, no showers, no dishwasher or washing machine. Every addition goes into a system that has nowhere to put it. Keep people and pets away from anything that has surfaced. Avoid chemical drain cleaners in a fixture that is already full, and do not attempt to clear a main-line blockage yourself.
Responsibility is covered in more depth in who is responsible for a blocked sewer drain on the Gold Coast.
Question not answered here?
Describe what the drain is doing. Most situations are quicker to work out in conversation than to look up.
Call 0483 909 757