On this soil a leak leaves no trace on the surface at all, so we find it with acoustic and pressure equipment instead of digging where it looks likely. On call 24 hours.
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Most leak advice assumes the ground will tell you. Look for the damp patch. Look for the grass that is greener than the rest. On clay that advice is sound.
Around Port Hacking the soil is permeable sand, and permeable means water passes through it rather than being held near the surface. A leak drains straight down and disperses.
So there is no patch, no soft spot and no greener stripe, no matter how long it has been running. Households here routinely discover a leak through a water bill rather than through anything they could see standing in the yard.
That changes how it has to be found. Equipment first, then a small targeted excavation, rather than opening the ground on a guess when the ground has deliberately hidden the answer.
Then water is escaping somewhere, and on this soil you should not expect to ever see it. That is worth acting on now rather than waiting for a sign that will not come.
A damp patch forms when the soil holds water near the surface. The permeable sand around here does the opposite: water goes straight down and takes the evidence with it.
So no wet patch, no greener stripe in the lawn, and no soft ground where you would expect it. All the visual tells that work on clay simply do not.
That is the single most important thing to understand about a leak on this soil.
Shut every tap and appliance, then watch the meter for a quarter of an hour. Movement with nothing running means water is genuinely leaving on your side.
On ground that hides everything else, this is not merely useful. It is close to the only reliable signal a householder has.
Turn any irrigation controller off entirely rather than to a rest day, or it will run during the measurement.
Once the meter has shown a loss, isolate the hot water unit and read again. Two minutes, and it is the single most useful thing a householder can do.
Keep moving: cold side. Stop: the unit or the hot distribution past it.
Before assuming a failed cylinder on a hot-side result, check the relief valve outlet, because a valve that has stopped sealing reads identically on a meter.
Escaping water carries fine sand with it, and the volume it removes leaves a void behind. Over months that shows as paving that dips or a path that rocks underfoot.
It is slow, it is easy to attribute to the paving itself, and it is frequently the only thing above ground that points at a location.
So if something has started moving, mention it. It is worth more here than a description of a symptom.
Sand has very little cohesion, so an open trench does not stand up. Every excavation has to be battered back or shored, which makes each hole substantially larger than the repair.
So the cost of a leak job here is set almost entirely by how many holes get opened and how big each one has to be.
Detection reduces both, which makes it the cheapest line on the invoice rather than the dearest.
Because the water vanishes rather than pooling, there is nothing prompting anybody to notice, and a burst on a buried line can run for a long time before anything gives it away.
Meanwhile it is removing material from under whatever is above it: a path, a driveway, a slab edge.
That is why the bill and the subsidence are the two symptoms worth watching for, rather than water.
Not in the dark, in the rain, on the night it matters. Find the meter, find its tap, and check the tap actually turns on a dry afternoon.
On older properties they seize, and a seized meter tap is its own small job on a quiet Tuesday rather than a crisis at midnight.
Learn the isolating valves indoors too, because closing one handles a specific failure without taking water off the house.
Acoustic listening picks up the noise a pressurised leak makes, and sand carries that sound differently from clay, which is worth knowing rather than guessing at.
Pressure testing sections isolates the run that is losing, and thermal imaging finds a hot water leak behind a surface.
The sequence matters: meter to confirm, isolation to narrow, then locating to a point.
Indoors, water follows the fall of a joist or the top of a slab and appears wherever it escapes. Outdoors on this soil it frequently does not appear at all.
So the absence of a visible symptom is not evidence of anything, and its presence is a clue rather than an address.
That is the reason nothing on this page recommends looking for a wet patch.
The braided hoses under vanities and behind cisterns last around five years and fail all at once, at mains pressure, frequently while nobody is home.
They are cheap, quick to replace, and the most common single cause of a genuinely destructive indoor flood.
Doing them as a set makes sense because they went in together and reach the end together.
On this soil that is the normal way a leak announces itself, because the ground absorbs every other symptom.
The order of work is the meter test, then the hot water isolation, then the run between the meter and the house.
A jump with no change in habits is worth acting on rather than watching for another quarter, because the ground is being emptied while you wait.
Dates, findings, photographs and the invoice from a licensed plumber. Together those describe a concealed leak and its repair in a way anybody assessing it can follow.
Sydney Water has an allowance for exactly that situation, with conditions they set and publish.
We are not assessors and will not advise on eligibility. We will make sure the record exists and is accurate.
Fixed price agreed before work starts. These are indicative 2026 ranges. On this soil the detection spend is what keeps the excavation small, which is usually where the real money is.
Isolated and stopped, any hour. Stops the damage before anything else is decided.
Acoustic and pressure testing to a point, not a general area.
Once located. Access is what moves the figure, not the pipe itself.
Reseated or replaced, usually inside the one visit.
Where it was, what caused it, and whether the ground around it needs attention.
On a burst that comes first, before anyone discusses cause or cost. Stopping the water is the priority.
Acoustic and pressure testing to narrow it to a point, because the surface here will not tell us anything.
A small targeted excavation rather than a wide trench, which on sand is both cheaper and considerably less disruptive.
Pressure tested before the ground goes back, and the surface reinstated properly.
Turn the water off at the meter if you can reach it, then call. A licensed plumber answers at any hour and can be on the way immediately.
Call 1300 381 569Yes, and on this soil that is the normal presentation rather than the unusual one. A leak surfaces when the ground holds water long enough to push it upward. Sand does the opposite. It is permeable, so the water drains vertically and disperses, and nothing ever appears at the surface. No damp patch, no soft spot, no greener stripe across the lawn. The leak can run for a very long time while every visible sign says the property is fine.
Usually the meter or the bill tells you before the ground does. Turn every tap off, close every appliance, and watch the meter for fifteen minutes. If the dial is still turning, water is going somewhere. A bill that has climbed without any change in the household is the other common trigger. Both of those are worth acting on here even when the yard looks completely undisturbed, because it will not show you anything.
With equipment rather than intuition. Acoustic gear listens for the sound of escaping water through the ground, pressure testing isolates which line has lost integrity, and correlation narrows it to a point rather than a general area. That matters more here than almost anywhere, because the alternative is excavating sand on a hunch and there is nothing on the surface to base the hunch on.
It can be, and it is worth checking. Water escaping into sand carries fine material along with it, and that material comes from somewhere. Over time the ground under a path, driveway or slab loses volume and the surface above it settles. A paver that rocks, a crack that keeps opening, a run of path that has sunk at one end. On clay you would not expect that from a leak. Here it is one of the few visible clues you get.
We would strongly suggest not, and not only for the obvious reason. Sand has almost no cohesion, so an open trench in it does not stand up the way one in clay does. The sides run, the hole gets wider than you planned, and you have destabilised more ground than the repair needed. Locating it properly first turns a large excavation into a small one, which on this soil is worth considerably more than it sounds.
First we confirm it is actually under the slab and not somewhere easier, because on sand the absence of a wet patch tells you nothing about depth. Once located, the options are a targeted break-in to the slab or rerouting the line entirely, and which is better depends on where it has failed and what the floor above it is. We price both before you choose, rather than opening the floor and discussing it afterwards.
Detection runs $300 to $600 depending on how much of the property has to be covered. An emergency make-safe is $250 to $500. The repair once we know where it is sits between $400 and $1,200 for most jobs, and the range is wide because access decides it. Paying to locate properly is nearly always cheaper here than paying to dig twice in ground that will not hold a trench open.
Tell us what made you suspect it: the meter, the bill, or something that has moved in the paving. On this soil those are the clues that exist, so they are where we start.
Located with equipment, opened only where it needs opening, and pressure tested before the ground goes back.
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