Blocked stormwater drain help in the Adelaide Hills
Updated October 2026
Stormwater drains only get tested when it rains, and in the Hills it rains properly. Water pooling against the house, overflowing gutters and downpipes, a flooded garage at the bottom of a steep driveway or a swampy patch of lawn are all signs the stormwater system is not carrying water away. Adelaide Hills Blocked Drains connects you with licensed local drain plumbers who clear and repair blocked stormwater drains across the Hills.
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
- Water sheeting down a driveway instead of entering the grate at the bottom
- Damp patches, moss or rising damp on walls near ground level
- A soggy section of lawn that never quite dries out
Unlike a blocked waste line, 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 the Adelaide Hills
The Hills put more through a stormwater system than the plains do, and a few local factors do most of the damage:
- Leaf litter, and a lot of it. The suburbs these hills are known for, Stirling, Aldgate, Crafers, Bridgewater, Mount Lofty's shoulders generally, are full of mature deciduous and native trees. Autumn fills gutters, downpipes and surface pits faster than most owners expect, and the following winter finds the blockage for you.
- Rainfall. The Hills receive considerably more rain than Adelaide below, and systems sized or installed decades ago now see a lot of water in a short time.
- Steep blocks. Water runs fast down sloping ground and carries soil, bark, mulch and gravel straight into pits and pipes. Long driveways act as channels, and the grate at the bottom takes everything the driveway collected on the way down.
- Gravel and unsealed surfaces. Unsealed driveways and tracks shed fine gravel and grit with every storm, and it settles in the flatter sections of pipe until the line silts up.
- Tree roots. The roots that invade waste lines invade stormwater pipes too, especially older clay or concrete lines in established gardens. Stormwater pipes are often shallower, which puts them closer to feeder roots.
- Bushfire season debris. After a dry summer, the first solid autumn rain washes accumulated ash, dust and fine debris off roofs and ground into the system all at once.
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 silt, gravel and leaf litter through the pipe and cuts tree roots off the walls.
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 the Adelaide Hills 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.
Stormwater and septic are not the same system
A point worth making in a region with a lot of septic systems: stormwater and wastewater are separate, and they should stay that way. Rainwater running into a septic tank or a CWMS connection overloads it fast, and a soakage or irrigation area that is already taking winter groundwater cannot take roof water as well. If your septic system only misbehaves during heavy rain, the cause may be stormwater finding its way in, through a cracked lid, an open inspection point or a surface drain discharging in the wrong place. A plumber can trace it.
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 road reserve belong to the local council, which across this region is mostly Adelaide Hills Council or Mount Barker District Council depending on your suburb. 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 winter
The cheapest time to fix a stormwater drain is a dry week in summer. If your drains struggled in the last heavy rain, a clear and camera inspection now costs far less than water damage later. Adelaide Hills Blocked Drains is a local referral service: we connect you with licensed drain plumbers who service suburbs from Crafers West and Piccadilly to Woodside, Lobethal, Nairne and Mount Barker. 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 the Adelaide Hills?
Typically $150 to $400 for a standard clear, with combined camera and jetting jobs typically $350 to $900. Silt-heavy or root-affected lines sit toward the upper end. Costs vary by job.
Why does my stormwater drain keep filling with silt?
On steep blocks and unsealed driveways, every storm washes soil and grit into pits, where it 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 the Hills 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.