Blocked sewer help in St George
Updated October 2026
A blocked sewer is the blockage that affects the whole house. The toilet, shower, sinks and laundry all drain into the one sewer line, so when that line blocks, everything backs up at once. St George Blocked Drains connects you with licensed local drain plumbers who diagnose and clear blocked sewers across St George.
How to tell your sewer is blocked
A single slow sink is a fixture problem. A blocked sewer shows up across the house:
- More than one fixture draining slowly or backing up
- Gurgling from floor drains or the shower when the toilet flushes
- Sewage smells inside or in the yard
- The overflow relief gully outside lifting its grate or overflowing
The overflow relief gully is your early warning system. It is designed to overflow outside before sewage backs up inside the house. If it is pooling or smells, your sewer line is blocked or close to it, and it is worth acting before wastewater finds its way indoors.
Why sewers block in St George
Much of St George was sewered early, and a lot of homes in suburbs like Penshurst, Bexley, Kogarah and Mortdale still run earthenware clay sewer lines. Those pipes are laid in short sections with a joint every metre or so, and after decades of ground movement the joints open up. Mature street trees and backyard plantings send fine feeder roots into any joint that leaks moisture, and the roots grow into a mat that catches paper and waste until the line blocks solid.
The region adds two more patterns. In the unit blocks around Hurstville, Rockdale, Arncliffe and Wolli Creek, many households share one line, and grease and wet wipes build up faster than in a single house. Along the Georges River at places like Blakehurst, Connells Point and Lugarno, homes sitting below street level often drain through long, steep runs or a pumped connection, and those lines have more places for waste to catch.
Other common causes include sanitary items, kitchen fat, sagged or back-falling pipe sections, and in older properties, pipes that have cracked or partially collapsed.
What fixing a blocked sewer involves
The licensed drain plumbers we work with typically follow this sequence:
1. Locate the blockage. Starting from the overflow relief gully and inspection openings, the plumber works out which section of line is blocked.
2. Clear the line. An electric eel or high-pressure water jetter cuts through the blockage. Jetting is the preferred option for roots and grease because it cleans the pipe wall rather than punching a hole through the blockage.
3. Camera the line. A CCTV inspection shows what caused the blockage and the condition of the pipe. For any recurring sewer blockage this step is strongly worth doing.
4. Recommend a lasting fix if needed. If roots have broken the pipe, the options are relining the damaged section or digging and replacing it.
What a blocked sewer costs to fix
Costs vary by job. As a guide for St George: a standard sewer blockage clear typically runs $150 to $400, around $280 for most jobs. Tree root clearing typically runs $250 to $600. A CCTV inspection typically runs $249 to $600, or $350 to $900 combined with jetting. Where roots have broken the pipe and relining is needed, expect $3,000 to $8,000 or more depending on the length and depth of the damaged section.
Your pipe or Sydney Water's pipe
Sydney Water owns and maintains the sewer mains running under St George streets and through backyard easements. As the property owner, you are responsible for the private sewer from your house to the point of connection with the main. If a plumber traces the blockage to Sydney Water's side of the connection, report it to Sydney Water and they repair it at their cost. A camera inspection with a locator gives you the evidence of exactly where the fault sits. In a strata building, the shared drainage is usually common property, so the owners corporation is involved too.
Get a fast quote
St George Blocked Drains is a local connection service rather than a plumbing business. We put you in touch with licensed drain plumbers who handle sewer blockages right across the region, from Kingsgrove and Bexley through Hurstville and Kogarah to Ramsgate and Sans Souci. Describe the problem and you will get a fast quote.
Frequently asked questions
How do I know if my sewer is blocked rather than just one drain?
If multiple fixtures back up or gurgle together, or the overflow relief gully outside is overflowing, the blockage is in the main sewer line rather than a single fixture.
How much does clearing a blocked sewer cost in St George?
Typically $150 to $400 for a standard clear, and $250 to $600 where tree roots are involved. A camera inspection to confirm the cause typically runs $249 to $600. Costs vary by job.
Who is responsible for a blocked sewer, me or Sydney Water?
You are responsible for the private line from your house to the connection point with the main. Sydney Water is responsible for the main itself. A camera and locator will show which side of the connection the fault is on.
Why does my sewer keep blocking every few months?
Recurring blockages almost always mean tree roots or a damaged pipe. Clearing restores flow but the roots regrow. A CCTV inspection will show whether the pipe needs relining for a long-term fix.