It’s Sunday night. The shower is up around your ankles, the kitchen sink is taking its time, and every time the washing machine empties, the toilet makes a noise like it’s clearing its throat. Then someone spots water bubbling up through a grate in the backyard.
I’ve been clearing blocked drains around South-West Sydney for 13-plus years, and that story is most of my Monday mornings. The good news is a blocked drain nearly always tells you where the problem is before anyone picks up a tool. If you would rather hand it to a licensed blocked drains plumber in South West Sydney, ring 0455 222 292 and Paul answers, with no call-out fee.
A blocked drain in a single fixture is usually hair, grease or soap, and a plunger, hot water or pulling out the hair trap will often clear it. If more than one fixture is slow, the drains gurgle, or water comes up the gully outside, the blockage is in your sewer line, usually tree roots or a damaged pipe, and it needs a plumber with a CCTV camera and a jet blaster.
Work out where the blockage is before you touch anything
The first question: one fixture, or the whole house?
One slow fixture (a slow draining sink, a shower that pools, a toilet that fills high) means the blockage is local, in the trap or the branch pipe right behind it.
Two or more fixtures playing up at once means the blockage is further down, in the main sewer line everything drains into. Flush the toilet and the shower burps; no plunger fixes that.
A gurgling drain is air being pulled back through the water seals in your traps because water is squeezing past a partial blockage. It’s an early warning, usually a few weeks ahead of the full block.
A sewer smell in the house with no gurgling is usually a dried-out trap; the floor waste in the spare bathroom nobody uses is the classic, and a jug of water down it fixes it. Smell plus gurgling means the sewer is backing up.
The overflow relief gully: the grate in the yard doing its job
Just about every house on the Sydney sewer has an overflow relief gully, or ORG: a grated outlet outside, usually near the kitchen or laundry, set lower than your indoor drains so that when the sewer blocks, the overflow comes out in the garden instead of up through your shower.
If water, or worse, is coming up through that grate, you don’t have a sink problem. You have a blocked sewer: stop running water, stop flushing, and call a plumber.
And please don’t pave over it. A surprising number of them live under a pot plant. Ask me how I know.
| What you’re seeing | Likely cause | What to do |
|---|---|---|
| One slow draining sink or basin | Grease, food scraps or soap in the trap | Plunge, hot water, clean the trap |
| Blocked shower drain, water pooling | Hair and soap in the hair trap | Pull the hair trap, then a hand snake |
| Blocked toilet, bowl fills high | Too much paper, wipes, a small toy | Flange plunger; stop flushing |
| Gurgling drain when another fixture empties | Partial blockage in the main line or vent | Go easy on water; book a CCTV inspection |
| Every fixture slow, or waste backing up | Blocked sewer: roots, collapse, wipes | Stop using water; call a plumber |
| Water or sewage at the overflow relief gully | Sewer blocked between house and main | Don’t lift the grate; call a plumber now |
| Yard pooling after rain, downpipes overflowing | Blocked stormwater drain: leaves, silt, roots | Clear grates and downpipes; jet blast if underground |
What’s actually blocking it
Kitchen sinks block from the inside out. Fat goes down hot, cools in the pipe, and grabs every coffee ground that follows. A blocked kitchen sink is rarely one big lump; it’s months of layers.
Showers and basins are hair and soap. A blocked toilet is usually too much paper in one go, “flushable” wipes (they aren’t; they knit together), or something a small person posted. The toy car is a classic.
Stormwater is a separate pipe system. A blocked stormwater drain is leaves, silt and roots: water pooling in the yard after a storm, downpipes overflowing, damp creeping into a wall. It’s rainwater rather than sewage, so it’s easier to ignore, right up until it’s under the house.
Tree roots in drains, and why the older suburbs cop it
Tree roots in a drain are the main cause of the whole-house sewer blockages I see. Roots follow moisture, get in through a hairline gap at a weeping joint, and thicken into a mat that catches every bit of paper going past.
A lot of the older homes around Liverpool and Fairfield still run on earthenware (clay) sewer pipes from the 1950s to 80s, with a joint every metre or so, and big street trees to match. There’s more in tree roots in sewer pipes.
Out in the newer estates like Austral and Leppington, the pipes are PVC and roots can’t get into a sound glued joint. What I find there is builder issues: a shallow pipe crushed by a trailer, a joint that was never glued, a length half-full of render from the build. Two-year-old house, blocked sewer, understandably annoyed owner.
How to unblock a drain yourself (the safe stuff)
If it’s one fixture, have a go. This is the order I’d do it in at home.
- Plunge it properly. Run a few centimetres of water in, block the overflow hole with a wet cloth, and give it a dozen firm pumps. For a toilet, use a flange plunger, the one with the extra lip.
- Hot water for a greasy kitchen sink. A kettle poured slowly softens a fresh grease slug. Once, not five times, and never into a toilet bowl; hot water and cold porcelain don’t get along.
- Pull the shower hair trap. Lift the grate, remove the basket or pop-up waste, and haul out the hair. It’s revolting, and it fixes most blocked shower drains on its own.
- Empty the bottle trap under the basin. Bucket underneath, unscrew the base, tip it out, rinse, washer back where it came from.
- Try a hand-crank drain snake. A small one from the hardware shop is fine for the trap and the first stretch of pipe. Gently in, crank when you hit resistance, slowly out.
Bicarb and vinegar? It fizzes and freshens a smelly waste. Nobody has ever cleared a real blockage with it, but plenty of people have enjoyed the volcano.
What not to do (a word about the drain unblocker aisle)
Caustic chemical drain unblockers are the ones I’d leave on the shelf. They work by heat and by eating whatever they touch, and on an old clay pipe or a tired PVC joint, that means the pipe and its seals.
If it doesn’t shift the blockage, and on hair and roots it usually doesn’t, whoever opens that trap next is working in caustic soda. That’s usually me.
Don’t push a snake into the sewer line either. A hired electric eel can punch through a clay joint or jam on a root mass, and now the cheap job has an excavation attached.
Don’t keep flushing a blocked toilet hoping for a different result. And if there’s sewage at the gully, leave the grate alone; there’s a reason plumbers get their hepatitis shots.
What a blocked drain plumber actually does
CCTV drain inspection first
A CCTV drain inspection is a small camera on a stiff push rod, fed down the pipe from an inspection opening while I watch the screen. In ten minutes I know what the blockage is (roots, grease, a collapsed section, a sagging belly) and how far in it sits.
A locator finds the camera head from the surface, which is the difference between a small hole in the right spot and a trench across the lawn.
Jet blasting (hydro jetting)
Jet blasting, or hydro jetting, is a hose with a nozzle that fires high-pressure water backwards to pull itself along the pipe, with forward jets to cut whatever’s in front. It slices roots, scours grease off the walls and flushes the lot to the main.
An electric eel punches a hole through a blockage and leaves the rest on the walls, which is why the same drain blocks again six months later. On a bad one I’ll jet it, then put the camera back down to check.
Roots, relining or digging
If the pipe is sound, jetting the roots out every year or two is a perfectly reasonable plan, and I’ll say so. If a crack or joint has opened up, relining usually beats digging: a resin-soaked liner cured inside the old pipe gives you a new pipe inside the old one, no trench.
If the pipe has collapsed or bellied, excavation is the honest answer. We own our own Komatsu PC18 mini excavator, so that part is done by us rather than waiting on a contractor. More on our sewer and stormwater page.
Who is responsible for a blocked sewer: Sydney Water vs the owner
Short version: Sydney Water owns and maintains the sewer main in the street, and you own the private pipes on your property up to where they connect to it. A blockage in the main is Sydney Water’s job, at no charge to you. A blockage in your pipes is yours.
If the neighbours are gurgling too, it’s probably the main, so call Sydney Water before you call me. If it’s only your place, it’s almost always the private line. Sydney Water can supply a Sewer Service Diagram showing where your private pipes run.
Stormwater is the other half: your local council generally looks after the street side, and the pipes on your block are yours.
Blocked drain cost in South-West Sydney
Blocked drain cost depends almost entirely on where the blockage is. Sydney 2026 price guides put a standard single-fixture clear at roughly $180 to $450, and a sewer line job with CCTV and jetting at $400 to $1,025, plus a call-out fee of $69 to $170. After hours, expect 50 to 100% more; an after-hours visit with an hour or two of work is commonly $400 to $900 all up.
Those figures come from What’s the Damage and line up with what I see. Relining and excavation depend on length and depth, so I won’t guess here; every job is quoted on inspection, once the camera’s been down.
We do a lot of blocked drains in Liverpool, and the older pipes there mean a fair share are the CCTV-and-jet kind. Whoever you use, make sure they hold a NSW plumbing licence; you can check one through NSW Fair Trading.
Drain blocked? Work out which drain first
The fix depends on the fixture. A blocked sink is grease and food in the trap and clears with a plunger, hot water and a hand snake. A blocked shower drain is hair and soap in the hair trap. A blocked toilet is paper, wipes or a toy. If more than one of them is slow at once, stop: that is the sewer line, and it is a plumber job.
Blocked drainage that keeps coming back
A drain that blocks, clears and blocks again a few months later is telling you something is inside the pipe, not just passing through it. Usually that is roots, sometimes a bellied or cracked section holding debris. Jet blasting blocked drains clears the lot rather than punching a hole through it, and the camera afterwards shows why it keeps happening. More on the root cause in tree roots in pipes.
Blocked sewer drain vs blocked stormwater drain
Your sewer takes the toilets, sinks and showers; your stormwater takes the roof and the yard. They are separate systems. Sewage or grey water at the overflow gully is a blocked sewer drain. A yard, driveway or garage that floods in rain is a blocked stormwater drain, usually leaves and silt at the pits and downpipe connections: see blocked stormwater drains. We clear both, and the sewer and stormwater plumber page covers the repairs.
Blocked drain in Liverpool, Fairfield or Campbelltown? Start here
If you are reading this in South West Sydney, the local pages say what is usually wrong in your suburb and what Paul does about it. In Liverpool it is shared lines under the unit blocks and roots in the clay sewers of the older streets. In Fairfield it is earthenware sewers under fifty-year-old figs, gums and jacarandas. In Campbelltown it is reactive clay soil cracking the old joints and roots finding the gaps. Everywhere else within about 20 km of Austral, from Camden to Cabramatta, the blocked drains page covers how a job runs, the blocked sewer drain page covers the whole-house blockage, and service areas lists every suburb. No call-out fee anywhere, and the camera goes down before anything is quoted.
When to call a plumber
Call when the plunger and hair trap haven’t done it, or when any of these show up:
- More than one fixture is slow or backing up at once.
- Drains gurgle when another fixture empties.
- Water or sewage is coming up the overflow relief gully outside.
- A sewer smell that hangs around after you’ve topped up the floor wastes.
- The same drain has blocked twice this year; something’s in there, and it isn’t leaving on its own.
If that’s you, give us a call or book online and we’ll bring the camera.
Related guides: do drain unblockers work and smelly drains.
Need it sorted? Ring 0455 222 292 any hour or book online. Monarch Civil & Plumbing is a blocked drains plumber in South West Sydney: Liverpool, Fairfield, Campbelltown and Camden, no call-out fee, and the rate is the same after hours.
Frequently asked
How do I know if my blocked drain is the sewer or just the sink?
If only one fixture is slow, the blockage is local, in the trap or the pipe right behind it. If two or more fixtures are slow at once, drains gurgle when something else empties, or water comes up through the overflow relief gully outside, the blockage is in your main sewer line and needs a plumber.
Can I use a chemical drain unblocker on a blocked drain?
You can, but I wouldn't, especially on the older clay drains common around Liverpool and Fairfield. Caustic unblockers generate heat and attack old pipes and seals, and they rarely shift hair or roots. If it fails, the next person to open the trap is working in caustic soda. A plunger, hot water and a hand snake are safer first moves.
Who is responsible for a blocked sewer, Sydney Water or the owner?
Sydney Water owns and maintains the sewer main in the street and will clear a blockage in it at no charge. The property owner is responsible for the private sewer pipes on their land up to the point of connection. If your neighbours have the same problem, call Sydney Water first; if it's only your house, it's almost certainly your line.
How much does it cost to unblock a drain in Sydney?
Sydney 2026 price guides put a standard single-fixture clear at around $180 to $450, and a sewer blockage with a CCTV inspection and jet blasting at $400 to $1,025, plus a call-out fee of roughly $69 to $170. After-hours work runs 50 to 100% more. Relining or excavation is quoted separately once the camera has shown what's wrong.
Why does my drain gurgle when I flush the toilet?
Gurgling means air is being pulled back through the water seal in a trap because it can't move freely through the pipe. Usually that's a partial blockage building up in the sewer line, often tree roots, or a blocked vent pipe. It's an early warning; a full block generally follows within a few weeks.
What is the overflow relief gully and why is water coming out of it?
The overflow relief gully is the grated drain outside your house, usually near the kitchen or laundry, set lower than your indoor fixtures. When the sewer line blocks, it's designed to release the overflow into the garden rather than through your shower or toilet. Water or sewage coming out of it means the sewer is blocked and you should stop using water and call a plumber.
Licensed plumber and drainer based in Austral, 13+ years in the trade, working across Liverpool, Fairfield and the Macarthur region. About Paul