How to Detect Hidden Water Leaks in Your Gold Coast Home

Most water leaks don’t announce themselves with a burst pipe or a flooded floor. They build slowly behind walls, under slabs, and beneath lawns — sometimes for months — before the damage becomes visible or the water bill triggers alarm. By then, the cost of water leak repairs is usually far higher than it needed to be.

This guide walks through the warning signs of a concealed water leak, the DIY checks you can do right now, the professional detection technologies our team uses, and what to do once a leak is confirmed — including how to apply for a Gold Coast City Council water bill remission that many homeowners don’t know they’re entitled to.

Signs You May Have a Hidden Water Leak

Hidden leaks rarely stay completely invisible. Before water becomes visible, a property will often show subtler clues. If you notice more than one of the following, a concealed leak is a likely cause.

• Higher than usual water bill. A sudden spike in your water usage — with no change in household habits — is one of the most reliable early indicators. Compare your current bill with the same billing period from the previous year, not just the previous quarter, as seasonal variation can obscure the comparison.
• Water meter ticking over when nothing is in use. If all taps, toilets, and appliances are switched off and your meter is still moving, water is escaping somewhere in your system. The meter test below shows you exactly how to check.
• Damp patches, staining, or bubbling paint. Moisture tracking through walls or ceilings often shows up as discolouration, soft plasterboard, or paint that blisters and peels. Swollen skirting boards and warped timber floors are also common in rooms above or adjacent to leaking pipes.
• Musty smell or mould growth. A persistent musty odour — particularly in bathrooms, laundries, or under-sink cupboards — often signals moisture accumulating behind surfaces. Mould can establish itself on wet plasterboard within 24 to 48 hours, so a musty smell in a consistently ventilated space warrants investigation.
• Unexplained wet patches in the yard. Soggy ground, pooling water on a dry day, or an area of lawn that is noticeably greener or growing faster than the surrounding grass can indicate an underground pipe leak. Canal-side and low-lying Gold Coast properties are particularly prone to this presenting without obvious surface water.
• Reduced water pressure. A gradual drop in pressure from taps or showers — particularly when it affects only part of the property — can point to a leaking supply line diverting water before it reaches the fixture.
• Sounds of running water. If you can hear water moving through walls or beneath floors when all fixtures are off, that sound is diagnostic. Even a faint hissing or dripping in the wall cavity is worth taking seriously.

Read our complete guide to water leak signs on the Gold Coast for a more detailed look at these signs.

The Water Meter Test: The Simplest Check You Can Do

Checking your water meter is the most reliable DIY method for confirming whether a leak exists somewhere in your system. It won’t tell you where the leak is, but it will tell you with certainty whether one is present.

Here’s how to do it:

1. Turn off every tap, toilet, and water-using appliance in the house — including the dishwasher, washing machine, and any garden irrigation systems.
2. Make sure no one in the household uses any water for at least 30 minutes, ideally an hour.
3. Locate your water meter — usually in the front garden near the street verge. Take a clear photo of the reading, including the small dials, and note the time.
4. Return after the waiting period without using any water and take a second reading.
5. If the reading has changed, water is moving through your meter. You have a leak somewhere between the meter and your fixtures.
6. To narrow it down further: turn off the internal stop valve (usually located where the main supply enters the house). If the meter stops, the leak is inside the property. If it continues moving, the leak is in the underground supply line between the meter and the house — which is your responsibility to repair, not the council’s.

The City of Gold Coast may also contact you directly if their monitoring detects abnormally high usage on your property. If you receive such a notification, this test is the recommended first step before calling a licensed plumber.

Tip: A dripping tap alone can waste more than 30 litres of water per day. Before running the meter test, check and fix or isolate any known dripping taps or running toilets — otherwise they will show as a ‘leak’ and prevent you from identifying concealed problems further in the system.

Checking Your Toilet for Silent Leaks

Toilets are a common source of concealed water loss, and a faulty flapper valve can waste thousands of litres before it’s noticed. The leak is silent because water moves directly from the cistern into the bowl rather than onto the floor.

The dye test is a straightforward way to check. Place a few drops of food colouring or a dye tablet into the cistern — not the bowl. Wait 10 to 15 minutes without flushing. If colour appears in the bowl, the flapper valve is no longer sealing properly and is allowing water to pass through continuously. A licensed Gold Coast plumber can replace the flapper quickly and at low cost.

Check every toilet in the house, as it’s common for more than one to develop the issue simultaneously, particularly in older properties or where the water supply has high mineral content.

How Professional Leak Detection Works

When a water leak is confirmed but the source can’t be identified through visual inspection or the meter test, our team uses non-invasive detection equipment to locate the precise point of failure — without tearing up floors or opening walls unnecessarily.

Acoustic Leak Detection

Acoustic listening devices detect the sound of water escaping under pressure through a pipe. The equipment amplifies the noise signature of the leak and allows our plumbers to trace it along the pipe run, narrowing down the location to within centimetres before any excavation or access work begins.

For underground pipes and concealed slab leaks, we use ground microphones capable of detecting the characteristic acoustic signature of a pressurised water escape through concrete, soil, and hard surfaces. The Sewerin Aquaphon A150 is one example of the specialist listening equipment used for this type of work — it can distinguish a leak signal from ambient noise in busy suburban environments, which matters when you’re working around Gold Coast traffic and coastal wind interference.

Thermal Imaging

Thermal imaging cameras detect temperature differences in surfaces caused by moisture. A leaking hot water pipe beneath a tile floor, for example, will create a warm patch detectable by infrared that is invisible to the naked eye. Conversely, a cold water pipe leak behind plasterboard will create a cooler zone. Thermal imaging is particularly useful for multi-storey properties and high-rise units where leak water tracks laterally before appearing at a lower level.

Pressure Testing

Pressure testing involves isolating sections of the pipe system and applying controlled pressure to identify where the system loses it. This method is used when acoustic detection can’t pinpoint the source precisely, or when a pipe run passes through areas where surface-level listening is impractical.

Together, these methods allow our team to identify hidden leaks with a high degree of precision, keeping repair work targeted and minimising disruption to your property.

When to Call a Licensed Plumber

Some checks are well within a homeowner’s capability — the meter test, the dye test, and a thorough visual inspection of accessible fixtures and pipework. But if any of the following applies, it’s time to call a QBCC licensed plumber rather than investigate further yourself:

• Your meter test confirms a leak but you can’t identify the source through visual inspection.
• You suspect an underground water leak — wet ground, sinking pavers, or unusual lawn growth with no obvious cause.
• There are signs of moisture or mould in wall cavities, ceilings, or under-slab areas.
• The property is on a slab foundation, where pipe access requires specialist equipment.
• A leaking toilet or tap has been repaired but the water bill remains elevated — indicating a second, concealed leak.
• You’ve received a high water usage notification from the City of Gold Coast.

Attempting to locate a concealed underground or in-slab leak without the right equipment usually results in unnecessary damage to surfaces and rarely identifies the correct location on the first attempt. Professional detection is faster, less disruptive, and — when it leads to a confirmed repair — opens the door to a council bill remission.

The Gold Coast City Council Concealed Water Leak Remission

This is something many Gold Coast homeowners are unaware of: if a concealed water leak on your property has caused an abnormally high water usage charge, you may be eligible to apply for a remission — a reduction in the excess council charges — under the City of Gold Coast’s Concealed Water Leak Policy.

To be eligible, the following conditions must be met:

• The leak must be in the underground water supply pipe connecting the meter to the first dwelling on the property (not internal fixtures or common property in a strata scheme).
• The leak must be repaired by a Queensland licensed plumber within one month of detection or council notification, whichever is sooner.
• The application must be lodged within three months of the issue date of the water and sewerage rate notice you’re claiming for.
• You must provide a repair invoice from a licensed plumber and, after repair, take two meter readings one week apart to confirm the leak is resolved.
• Only one remission will be considered within any three-year period.

Residential properties and eligible small businesses can receive an adjustment of 100% of the excess council charges attributable to the leak. The full eligibility criteria and application form are available directly from the City of Gold Coast’s concealed water leak page. Our team can provide the repair invoice and documentation you need to support your application.

Acting promptly matters here. The one-month repair window runs from the date you identify the leak — or the date council notifies you of high usage — not from the date you receive the inflated bill. Delaying the repair can disqualify an otherwise valid claim.

Suspect a Water Leak? We Can Find It.

Our licensed plumbers provide water leak detection and water leak repairs across the Gold Coast, including acoustic, thermal, and pressure-based detection for concealed and underground leaks. With a $0 call out fee and same-day availability in most areas, there’s no reason to wait while a hidden leak compounds the damage.

Contact our team to book an inspection.

For related reading, see our guides, Help, I Think I Have a Leak! What Do I Do? and How Thermal Leak Detection Works.