You hear it before you see it. A hiss behind the wall, a drip through the ceiling, or a spray under the kitchen sink that’s already soaking the cupboard. A burst pipe moves fast, and the first few minutes decide whether you’re mopping up a puddle or drying out floorboards for a week.
This is a calm, in-order plan for exactly that moment. No jargon, no guesswork. Do these things in this order and you’ll limit the damage before anyone even knocks on your door.
TL;DR: the first five minutes
- Shut off the water at the mains. This is the single most important move. It stops more water reaching the burst.
- Open your taps. Turn on cold taps and flush a toilet to drain the pressure out of the pipes and slow the leak.
- Kill the power if water is near anything electrical. Only if you can do it safely and without standing in water.
- Move and protect your stuff, then contain the water with towels, buckets, or a container under the leak.
- Call a licensed plumber and take a few photos for your insurer while you wait.
Step 1: Shut off the water at the mains
Everything starts here. The quicker you stop the flow, the less water ends up in your walls, ceiling, and floor. Every minute the water runs is more damage.
Your main stop tap is usually near the water meter at the front of the property, often by the boundary or near the front fence. In units and apartments there’s frequently an isolation valve inside the unit, sometimes in the bathroom, laundry, or a hallway cupboard. Turn it clockwise to close it. It can be stiff if it hasn’t been touched in years, so give it a firm turn.
If the burst is on one fixture, like a toilet or the pipe under a basin, there may be a smaller isolation valve right at that fixture you can close instead. But if you’re not sure or it’s spraying badly, just go straight for the mains. Going without water for an hour beats flooding the house.
Worth knowing for later: from the water meter into your home, the pipes are your responsibility. Everything from the meter to your house and within your property, including internal pipes, fixtures and hot water systems, is your responsibility. If the water is gushing out on the street side of the meter instead, that’s likely a Sydney Water main. If you notice an unusual amount of water in a public space, contact Sydney Water immediately on 13 20 90, available 24 hours a day, 7 days a week.
Step 2: Drain the pressure out of the pipes
Once the mains is off, there’s still water sitting in the pipes with pressure behind it. Open the cold taps around the house and flush a toilet or two. That drains the system down and eases the pressure on the damaged pipe, so the leak slows to a trickle instead of a spray.
Leave the hot taps for now if you’ve got a storage hot water unit, and don’t drain that system dry. You’re just relieving the pressure in the pipework, not emptying every tank in the house.
Step 3: If water’s near electrics, deal with power safely
Water and electricity are a dangerous mix. If the burst is spreading toward power points, an appliance, a light fitting, or your switchboard, you want the power off.
Here’s the rule that matters most: never stand in water to reach a switchboard, and never touch electrical switches with wet hands. If you can safely and dryly reach the board, switch off the affected circuit or the main switch. If you can’t reach it without walking through water, don’t risk it. Stay clear, keep everyone away from the wet area, and get a plumber or electrician on the phone.
If a ceiling is sagging or bulging with trapped water, stay out from under it. That water is heavy and the plaster can come down without warning.
Step 4: Contain the water and protect your things
With the flow stopped and pressure released, the panic is over. Now limit the mess.
- Put a bucket, tub, or container under any active drip.
- Lay down towels or a mop to soak up standing water before it soaks into skirting boards and subfloor.
- Move furniture, rugs, electronics, and anything valuable out of the wet zone.
- Lift curtains and cords off the floor.
Standing water doesn’t just damage flooring. Left for a day or two it turns into swollen skirting, warped floors, and mould, which is a far bigger repair than the pipe itself. Getting it dry quickly genuinely saves money.
Step 5: Photograph the damage for your insurer
Before you clean everything up, spend a minute documenting it. Take clear photos and a short video of the burst, the water, and anything that’s been damaged. Note where the broken pipe is if you can see it, because that helps the plumber head straight to it when they arrive.
Home and contents insurance often covers sudden water damage from a burst pipe, so a few photos now can make a claim far easier later. Check your own policy for what’s covered before you assume anything.
Step 6: Call a licensed plumber
Shutting the water off is a stopgap, not a fix. The pipe still needs repairing, and a burst is often a sign of a wider problem: corroded old pipework, ground movement, or pressure issues that will strike again somewhere else. A licensed plumber can locate the break, repair or replace the damaged section properly, and check the rest of the system while they’re there.
In older Sydney homes especially, original pipework tends to give suddenly after years of wear. If you’re in the St George area or the Shire and water’s going where it shouldn’t, our team runs a 24/7 emergency plumbing service and a real plumber answers the phone, not a call centre. When you call, we’ll talk you through shutting off the water if you haven’t already and give you an honest ETA.
Is it actually an emergency, or can it wait until morning?
Once the water’s off and contained, a slow leak from a small isolated pipe you’ve already shut off can sometimes wait for a booked appointment. But treat it as an emergency if:
- You can’t stop the water even after shutting the mains.
- Water is coming through a ceiling or spreading fast.
- It’s near electrical fittings or the switchboard.
- The house is unusable, or you’ve got no water at all because you’ve had to keep the mains off.
When in doubt, call. It costs nothing to describe the problem and get an honest read on whether it needs sorting tonight.
What not to do
- Don’t ignore a “small” burst. Water tracks along beams and behind walls, so what looks minor on the surface is often worse out of sight.
- Don’t tape or patch it and forget it. A temporary wrap might slow a drip until the plumber arrives, but it’s not a repair.
- Don’t touch electrical anything while standing in water. Ever.
- Don’t put off finding out why it burst. A recurring failure usually means the pipework itself is on the way out.
A quick word on prevention
Most bursts in Sydney trace back to ageing pipes, high pressure, or the odd exposed line that cops a cold snap. Knowing where your mains stop tap is before anything goes wrong is half the battle, so go and find it this weekend and check it actually turns. If you want to get ahead of the seasonal risk, our guide on preventing frozen pipes over a Sydney winter covers the exposed spots worth protecting. And if you keep seeing damp patches or unexplained water without an obvious source, that’s worth a proper leak detection check before it becomes the next burst.
The takeaway
When a pipe bursts, the order is simple: water off at the mains, taps open to drain the pressure, power safe if it’s near electrics, then protect your gear and call a plumber. Do those first steps calmly and you turn a potential disaster into a manageable repair. If you’re local and it’s happening right now, don’t wait it out. Get the burst pipe sorted before the water spreads.