Overflowing Drains Sydney
Cleared Now Drain Plumbing clears overflowing drains across Sydney: blocked sewers and blocked stormwater drains.
Wednesday Drain Deal
Call Now & Get $65 Off Your First Service
Call (02) 9158 3577 and our CCTV drain camera finds the cause before we clear anything, with a $0 call-out fee.
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Honest Diagnosis
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$0 Call-Out Fee
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Same Day Service
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Lifetime Labour Warranty
What an Overflowing Drain Is Telling You
A drain overflow usually means a blockage somewhere down the line. Sydney Water lists four signs of blocked drains. A sink, bath or toilet empties slowly. A toilet won't flush properly or has overflowed. Gurgling from a toilet or floor drain belongs on that list too, and our gurgling drains page takes it further. Wastewater spills from the drain or gully beside the outside tap. Our blog on spotting a blocked drain expands the list. Sydney Water tells owners to call a licensed plumber for blockages in private pipes. NSW gives draining its own licence category: the flushing or cleansing of sanitary drains that connect with a sewer. The clearing work belongs with our licensed plumbers and drainers. An overflowing drain is one of the blocked drains Sydney homes run into, and our camera finds its cause before we clear anything.
What Makes a Drain Overflow
The usual causes of an overflowing drain are fats, oils and grease poured down sinks, unflushables in toilets, tree roots, and stormwater overwhelming the wastewater network in heavy rain. The 3 Ps are the rule for toilets: pee, poo and toilet paper are the only flushes, plus products that meet AS/NZS 5328, the flushable products standard. Wet wipes sit outside that list and count as a common unflushable item. A partial blockage can let the drain overflow and back up into the lowest fixture. Sydney Water advises planting new trees no closer than 6 metres to wastewater pipes. Our tree roots page covers the trees to avoid near a sewer line.
Overflowing Drains We Clear
Every overflowing drain we come across fits one of the job types below, whether the overflow is stormwater in the rain or sewer at the gully:
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A stormwater overflow shows up when outside drains run over in every downpour and the grate can't take the flow. Leaves and debris build up against the grill and block the grate. Grass or roots growing out of the drain hold back water and debris. Water can also arrive as overland flow from a neighbouring property. Gardens and car washing can also leave an outside drain overflowing every evening with no rain, and that water has nowhere to go. Mosman Council asks residents who suspect a flow problem from a neighbouring property to raise the problem with the neighbour and track down the source cooperatively. The council steps in only where a defect exists with existing systems. Heavy rain can affect either system, and Sydney Water's two-type split covers wastewater overflows only. When the grate runs over in every downpour, a blocked stormwater drain is the usual cause, and that page covers the pipe and pit work in depth.
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A sewer drain overflowing at the gully shows up any hour, not just in rain. Odd plastic pieces can turn up in a sewage overflow. A blocked sewer appears first at the overflow relief gully (ORG), a grated drain near the outside tap. Wastewater spills from the gully when the sewer blocks. An overflow relief gully must sit at least 150 mm below the lowest sanitary fixture to work effectively, under the National Construction Code (NCC) 2022 explanatory note to 3.3.3. The gully's installation follows AS/NZS 3500.2, the standard covering sanitary plumbing and drainage. Wastewater at the gully can point to a blocked sewer line, and that page carries the sewer clearing and repair depth.
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Overflows That Keep Returning
Get a quoteAn overflow that keeps returning usually means roots in the line. Roots that enter small cracks keep growing, take up space and slow drainage until the pipe blocks again. Our Tree Root Removal page owns the root cutting, relining and trees-to-avoid detail.
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Floor, Shower, Laundry Overflows
Get a quoteFixture overflows show up inside the house: a shower or floor drain overflow, or a laundry overflow where the washing machine drain keeps backing up. The washer and floor waste jobs start on our floor waste page, which covers floor drains and their traps in depth.
Rain Overflows vs Dry Weather Overflows
Sydney Water splits wastewater overflows into two main types. A dry weather overflow, also called a choke, is a blockage-driven overflow needing no rain: a partial or complete blockage reduces the pipe's capacity until wastewater backs up. A wet weather overflow happens when flow in very heavy rain exceeds the pipe's capacity. In very heavy rain, extra water enters through cracked pipes, faulty joints, around maintenance hole lids and by stormwater pipes connected straight on. A maintenance hole is the access point Sydney Water uses to clear blockages. If Sydney Water can't reach maintenance holes, wastewater can back up and flow out of grates into the street, the yard or inside the home. The split matters when a drain overflowing in rain keeps overflowing in hot dry weather too, and the owner can't tell rainwater from sewage.
Our Process
Clearing an overflowing drain runs in three steps, camera first:
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Camera check
We inspect with the CCTV drain camera before clearing anything, so the fix targets the real cause instead of a guess. -
The written quote
We write the price down before any work begins, on every job. You never pay to clear a drain without knowing the cause or the cost. -
The clear
We inspect and jet, or run the eel, depending on what the camera found. Hydro jetting suits grease, silt and roots along the pipe wall. The electric eel, the drain machine, bores through a solid blockage. Our jet blaster and electric eel handle the block-and-clear work the picture calls for.
Why Choose Cleared Now Drain Plumbing
Customers have left 300+ five-star reviews. Our team is local and owner-led, with 15+ years' experience:
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Honest Diagnosis on Site
You hear exactly what's wrong with the drain and the fix we suggest, before we touch anything. The camera shows the cause on site, so you're not paying for a guess.
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Open 24 Hours, Same Day
We're open around the clock for same-day emergency service. Same Day Service covers the booking. A real person takes every call, day and night.
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$0 Call-Out, Written Quote
Your $0 call-out fee comes with fair, upfront pricing, no surprises. Your written quote comes through before any work begins, on every job. Best Price Guaranteed applies on a written quote. New customers get $65 off their first service.
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NSW Contractor Licence
Our contractor licence 498750C comes from NSW Fair Trading. The licence covers plumber, drainer, gasfitter and liquefied petroleum (LP) gasfitter classes, which backs our licensed plumbers and drainers title. Cleared Now Drain Plumbing is fully licensed and insured.
Overflowing Drain Costs in Sydney
The blocked drain cost bands below come from What's The Damage, October 2026, a Sydney cost guide, with GST included in every price:
| Job | What's included | Sydney price range | Source |
|---|---|---|---|
| Standard drain clear | A blocked drain cleared by electric eel, Sydney, GST included | $170 to $575 | What's The Damage Sydney guide (October 2026) |
| CCTV camera plus jetting | A stubborn blockage that needs the camera and high-pressure water jetting, Sydney, GST included | $400 to $1,275 | What's The Damage Sydney guide (October 2026) |
| After-hours visit | An evening or weekend call-out, Sydney, GST included | $290 to $805 | What's The Damage Sydney guide (October 2026) |
| Typical Sydney call-out fee | What Sydney plumbers generally charge to attend during business hours | $69 to $170 | What's The Damage Sydney guide (October 2026) |
| Our call-out | A plumber comes to look at the overflowing drain | $0 | Cleared Now Drain Plumbing |
Root intrusion in older clay pipes shows up across Sydney's established suburbs. Relining gets quoted separately after the camera inspection, so the written quote follows the camera check. What's The Damage's October 2026 guide also names sandstone, which can add $500 to $2,000 to excavation work in the inner suburbs.
Areas We Service
Same Day Service reaches overflowing drains across Sydney: Northern Beaches, North Shore, Hills District, Inner West, Eastern Suburbs, Western Sydney, Sutherland Shire and South West Sydney.
Book an Overflowing Drain Plumber in Sydney
A drain overflowing now needs a plumber today, rain or not. Call (02) 9158 3577 any hour: a real person picks up and lines up Same Day Service, with a $0 call-out fee. New customers get $65 off their first service. Our emergency blocked drains service runs the same 24 hours. With Cleared Now Drain Plumbing, the camera finds the cause before we quote, and the Lifetime Labour Warranty covers the labour on the clear.
Frequently Asked Questions
How Much Does It Cost to Clear an Overflowing Drain in Sydney?
What's The Damage's October 2026 Sydney guide puts a standard drain clear at $170 to $575 with an electric eel. What's The Damage also puts camera plus jetting for a stubborn blockage at $400 to $1,275, GST included, in the same October 2026 guide. The camera inspection and what it finds set the band. The written quote confirms the price before any work starts.
Why Does My Outside Drain Overflow Only When It Rains?
Rain is the trigger: the pipe or pit can't take the flow. Very heavy rain pushes extra water in through cracked pipes, faulty joints, maintenance hole lids and stormwater pipes connected straight into the system. Heavy rain is a frequent cause of wastewater overflows. Leaves and debris held against the grill slow the grate further.
Should I Try to Unblock an Overflowing Drain Myself?
DIY stops at lifting the grill and clearing leaves on a drain you know is stormwater. Don't lift the lid or pour test water in when the overflow might be wastewater. A licensed plumber takes over at wastewater in the gully or a blockage below the grate. The how to unblock outside drain guide marks the DIY limit, from the grill down to a deeper blockage.
Is an Overflowing Drain a Health Risk?
Yes, wastewater from an overflowing sewer drain is a health risk. Sydney Water says wastewater carries bacteria, viruses and protozoa, which can cause gastroenteritis through direct contact. Keep children and pets away and stay clear until a licensed plumber clears the blockage.
Who Is Responsible for an Overflowing Drain in Sydney?
The property owner answers for the wastewater pipes up to the connection point, where the private pipes join Sydney Water's network, and calls a licensed plumber there. The blockage probably lies in Sydney Water's pipes when the overflow shows beyond the boundary or neighbours have the same problem. Widespread local flooding points the same way. So does an overflow that runs with no water in use. The blockage probably lies in the private pipes when neighbours are fine, the drainage isn't shared, no local flooding shows, and the overflow comes only while water is in use. Sydney Water's faults line, 13 20 90, answers 24/7 and sends a crew out. A customer can claim reasonable out-of-pocket expenses after paying a licensed plumber for a blockage in Sydney Water's pipes. Claims take up to 8 weeks. Sydney Water's wastewater blockages page sets out the signs that point to its pipes and the faults line for reporting them.
How Do I Book an Overflowing Drain Plumber in Sydney?
One call to (02) 9158 3577 books Same Day Service for the overflowing drain. A real person takes the call at any hour, and the call-out fee is $0.