Blocked stormwater drain help in St George
Updated October 2026
Stormwater drains only get tested when it rains, and by then it is too late to find out they are blocked. Water pooling against the house, overflowing gutters and downpipes, a flooded garage or a swampy lawn are all signs the stormwater system is not carrying water away. St George Blocked Drains connects you with licensed local drain plumbers who clear and repair blocked stormwater drains across St George.
Signs of a blocked stormwater drain
- Downpipes overflowing at the top during rain
- Water pooling around the base of the house or in low spots of the yard
- Grated surface drains and channel drains holding water
- Damp patches, moss or rising damp on walls near ground level
- A soggy section of lawn that never quite dries out
Unlike a blocked sewer, a blocked stormwater drain rarely smells or backs up indoors, so it often goes unnoticed until a heavy downpour causes flooding or water damage.
Why stormwater drains block in St George
St George's stormwater systems deal with a mix of conditions, and a few local factors do most of the damage:
- Sand. Along the Botany Bay foreshore at Brighton-Le-Sands, Monterey, Ramsgate and Dolls Point, sandy soil washes into pits and pipes and settles in the flat sections. Over time the pipe silts up until a moderate shower overwhelms it.
- Flat, low-lying ground. Suburbs near Muddy Creek, the Cooks River and Wolli Creek have little natural fall, so stormwater moves slowly and drops sediment as it goes.
- Steep blocks. On the Georges River side, at Oatley, Lugarno, Kyle Bay and Blakehurst, water runs fast down sloping blocks and carries soil, leaves and mulch straight into pits and pipes.
- Tree roots. The roots that invade sewer lines invade stormwater pipes too, especially older clay or concrete lines in established suburbs like Bexley, Penshurst and Kingsgrove. Stormwater pipes are often shallower than sewers, which puts them closer to feeder roots.
- Leaves and building debris. Leaf litter from street trees collects at bends and pits, and renovations send soil and offcuts into unsealed pits.
What clearing a stormwater drain involves
The licensed drain plumbers we work with usually take this approach:
1. Inspect pits and downpipes. Many blockages sit in an accessible pit full of leaves and silt, which can be cleared by hand or vacuum.
2. Jet blast the lines. High-pressure water jetting flushes sand, silt and leaf litter through the pipe and cuts tree roots off the walls. For sand-laden lines near the bay this is the standard method.
3. Camera the pipe. A CCTV inspection confirms the pipe is clear and shows any cracks, sags or collapsed sections that will keep catching debris.
4. Fix structural faults. Broken sections can be repaired, relined or re-laid, and poorly draining designs improved with extra pits or re-grading.
What it costs
Costs vary by job. A standard stormwater blockage clear in St George 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, and a combined camera and jetting job typically runs $350 to $900. If roots have broken the pipe, relining typically costs $3,000 to $8,000 or more depending on the length of the damaged run.
Whose drain is it
Private stormwater drainage on your property, from roof gutters and downpipes to the street kerb or the council system, is the owner's responsibility. The pits and pipes in the street belong to the local council, which across St George is mostly Georges River Council or Bayside Council depending on your suburb, and the sewer mains belong to Sydney Water. If water is backing up from a blocked street pit rather than your own line, report it to your council. A plumber can quickly tell you which side of the boundary the problem sits on.
Get ahead of the next storm
The cheapest time to fix a stormwater drain is a dry week. If your drains struggled in the last heavy rain, a clear and camera inspection now costs far less than water damage later. St George Blocked Drains is a local referral service: we connect you with licensed drain plumbers who service suburbs from Riverwood and Peakhurst to Arncliffe, Rockdale and Sans Souci. Tell us what you noticed and get a fast quote.
Frequently asked questions
How much does it cost to clear a blocked stormwater drain in St George?
Typically $150 to $400 for a standard clear, with combined camera and jetting jobs typically $350 to $900. Sand-heavy or root-affected lines sit toward the upper end. Costs vary by job.
Why does my stormwater drain keep filling with sand?
Near the bay, in suburbs like Brighton-Le-Sands and Ramsgate, sandy soil washes into pits and settles in flat pipe runs. Jetting flushes it out, and fitting silt traps or fixing pipe grades slows the build-up.
Who is responsible for stormwater drains, me or the council?
You are responsible for the drainage on your property up to the kerb or the council connection. Your local council looks after the street pits and mains.
Can tree roots block a stormwater drain?
Yes, and in St George's leafier suburbs they often do. Stormwater pipes are usually shallow, which puts them within easy reach of tree roots. Jetting clears the roots, and a camera shows whether the pipe itself is damaged.