Blocked downpipe and stormwater line clearing
If rain bursts out of the bottom of a downpipe, bubbles up around its base, or you notice gutters overflowing at the downpipe in storms, the pipe underneath is almost certainly choked. Our Matraville-based plumbers clear blocked downpipes and the underground stormwater lines they feed for homes across the southern Eastern Suburbs, with your options and a fixed price explained up front.
Signs of a blocked downpipe
Water spilling at ground level
When the line below is full, rain has nowhere to go but out of the joint where the downpipe meets the ground pipe, flooding the garden bed or path.
Overflow near the top in heavy rain
Water pouring over the edge right where the downpipe starts usually means the downpipe or the pipe below it cannot take the flow. The blockage is often lower than people think.
Gurgling or a slow trickle
A downpipe that still gurgles or drips long after the rain stops is draining far too slowly, a sign of leaves and sand packed in somewhere.
Soggy ground or sinking soil
A wet patch or a slight dip along the path of an underground line can mean water is escaping from a blocked or broken joint.
What causes downpipes to block
Leaves, twigs, seed pods and roof grit wash off with every storm and slide straight into the downpipe. On their own they might pass through, but where the downpipe bends into the ground they tend to snag and build a plug. Add a layer of sand, which blows onto roofs and washes in from paths in coastal suburbs, and the underground line slowly fills from the bottom up.
Older stormwater lines bring extra trouble. Clay pipes with loose joints let roots and soil in, and a pipe that has sagged or cracked holds debris instead of letting it run through. Sometimes a line has simply been crushed by a car, a tree or years of ground movement.
How we clear a blocked downpipe
We work from ground level. After finding where the downpipe enters the stormwater system, we open the line at the base or at the nearest pit and use a high-pressure jetter to blast out the leaves, sand and silt. The jet travels along the underground pipe toward the kerb or discharge point, scouring it clean as it goes.
Once water is flowing freely, we can run a drain camera through the line to check what's going on inside. That footage shows whether the blockage was just debris or whether a broken joint, root intrusion or collapsed section caused it. If there's damage, we explain the repair options and give you a fixed price for each, so you choose the fix that suits you.
To help stop it happening again, we can fit a ground-level leaf trap or an inspection opening near the base of the downpipe, so debris can be cleared without digging.
Blocked downpipes in southern Eastern Suburbs homes
Sand is the big one in this part of Sydney. In Maroubra, Malabar, Little Bay and Matraville, sand finds its way into almost every stormwater line we open, and once it settles in a low spot it sets almost like concrete. Jetting is the only practical way to shift it.
Homes near big street trees, especially older brick and fibro houses in Botany and Matraville, also get a steady load of leaves and gumnuts. Their stormwater lines are often old clay, laid long before modern PVC, so roots and cracked joints are common. In the newer townhouses and duplexes of Pagewood and Eastgardens, downpipes are often tucked into tight spaces and connected to long shared lines, which makes a blockage harder to spot until water spills out.
What you can safely check yourself
- Clear leaves and sand from any stormwater pit grates near the downpipe.
- Look at the base of the downpipe after rain for spilling water or wet ground.
- Check that the kerb outlet at the street is not buried under leaves or sand.
- Stay off ladders and the roof. If the problem looks to be higher up, leave it to a professional.
Why locals ring us for blocked downpipes
- Based locally at Girawah Place, Matraville
- 100-plus five-star ratings from Google reviewers
- We quote on site at no cost and fix the price before starting
- Lifetime warranty covering labour on our workmanship
- Licensed plumbing and gasfitting team, Lic. 398171C
Common questions
How do I know if the downpipe or the underground line is blocked?
If water spills out where the downpipe meets the ground, the blockage is usually in the underground line. We find the exact spot by opening the line and using the jetter and camera.
Why does water overflow at the downpipe in heavy rain?
When the downpipe or the pipe below it is partly blocked, it cannot carry a big storm's worth of water, so it backs up and spills over at the top of the downpipe.
Can I clear a blocked downpipe with a garden hose?
A hose can sometimes flush loose leaves near the bottom, but it will not shift packed sand or roots further along. Avoid climbing ladders to try it.
Do you need to get on the roof to clear a downpipe?
No. We clear the downpipe and the stormwater line from ground level, using the opening at the base or the nearest pit.
What if the camera finds a broken pipe?
We show you the footage, explain the damage and give you repair options with a fixed price, such as replacing a short section or relining the pipe.
How can I stop my downpipe blocking again?
Keeping pits and grates clear helps, and a ground-level leaf trap or an inspection opening near the base makes future clean-outs quick and easy.
Is a blocked downpipe urgent?
It is worth fixing soon. Water spilling around the base can soak footings, wash out paths and find its way under the house in the next storm.
This is part of our stormwater plumbing service. See also drain jetting, blocked drains and stormwater pit installation. We clear downpipes for homes in Maroubra, Malabar, Little Bay and Botany.
Want to know more first? Our free stormwater guide explains how your downpipes, pits and stormwater lines fit together.