How to spot a hidden water leak before it costs you a fortune (Sunraysia homeowners)

A hidden water leak is one of the most expensive plumbing problems a homeowner can face. The cost comes not from the repair itself but from the damage that builds up silently for weeks or months before anyone notices. In the Sunraysia climate, that moisture gets into wall cavities, under slabs, and behind cabinetry, and the rot and mould it causes can cost far more to fix than the original plumbing issue.

Here is how to spot the signs early, how to use your water meter to confirm a leak, and what to expect when you call Brad out to find and fix it.

Warning signs of a hidden water leak

Hidden leaks give themselves away through several reliable symptoms. The more of these you notice, the more confident you can be that there is a leak somewhere in the system.

Your water bill goes up with no change in usage

This is the most common way hidden leaks are discovered. If your quarterly water bill has jumped and you have not been using more water, there is a reasonable chance you have a leak. In Sunraysia, even a slow toilet leak or a dripping outside tap can add hundreds of litres per day to your consumption.

You can hear running water when everything is off

Stand in a quiet room in the house with all taps, appliances, and the toilet fully at rest. If you can hear a faint hiss, trickle, or running sound through the walls or floor, it is worth investigating further.

Damp patches, soft floors, or staining

Water stains on ceilings below a bathroom, soft or spongy patches in a timber floor, bubbling paint on walls, or persistent damp patches in otherwise dry areas are all signs of a slow leak behind the surface. In the Mildura climate where the air is typically dry, unexplained dampness indoors is always a red flag.

Mould or mildew in unusual spots

Mould on bathroom tiles is one thing, but mould growing on a wall nowhere near a shower, or under kitchen cabinetry, usually means moisture is coming from somewhere it should not be.

Cracking or shifting in concrete areas

Leaks under concrete slabs cause the ground beneath them to shift as water erodes the substrate. If you notice new cracking in a concrete path, driveway, or floor slab, or sections that have started to lift or sink, a slab leak is worth ruling out.

How to check your water meter for a leak

This is the most reliable test you can run yourself, and it takes less than an hour.

1. Turn off every tap, appliance, and water outlet in the house. Make sure no one flushes the toilet, starts the dishwasher, or uses any water during the test.
2. Go to your water meter (usually near the front boundary of your property) and write down the exact reading, including the small dials if it has them.
3. Wait 30 minutes without using any water inside or outside.
4. Check the meter again. If the numbers have moved, water has been used somewhere. Since everything was off, it is leaking.

Common locations for hidden leaks in Sunraysia homes

Toilets

A leaking toilet is the single most common source of unexplained high water bills. The leak is usually between the cistern and the pan and is often silent; the water runs straight into the drain without making a sound. The easiest test: put a few drops of food colouring in the cistern and wait 15 minutes without flushing. If the colour appears in the bowl, the cistern is leaking.

Hot water system connections

The inlet and outlet connections on hot water systems are under constant pressure and temperature cycling, which stresses the fittings over time. Small drips at these connections are easy to miss, particularly if the unit is outdoors or in a concealed space.

Underground service pipes

Properties in Dareton, Mildura, and wider Sunraysia often have older underground copper supply pipes that are susceptible to pinhole corrosion. These leaks are directly below the ground and can run for months with the water simply soaking into the soil. The first sign is usually a suspiciously green or lush patch of lawn over where the pipe runs, even during dry periods.

Irrigation and outside taps

Many Sunraysia properties have irrigation systems. Fittings, solenoids, and poly pipe connections outdoors degrade in the heat and UV exposure and can develop slow leaks that never surface visibly because the water soaks straight into the ground.

What Brad does to find a hidden leak

When Brad attends a suspected water leak, he starts with the meter test to confirm water is actually being lost. He then works systematically through the most likely sources based on the symptoms: toilets first, then hot water connections, then internal supply lines, and finally underground or slab sections if the above come up clear.

For suspected slab or underground leaks, Brad uses pressure testing to isolate sections of pipe and narrow down the location before any digging or concrete cutting is needed. This approach minimises disruption and cost compared to guessing at the location and digging speculatively.

Once found, most leaks are repaired in the same visit. Underground and slab leaks may require a follow-up depending on access and the extent of the pipe damage.

Who is responsible for the repair?

As a general rule: the utility is responsible for leaks in the water main up to and including your meter. Everything beyond the meter on your property is your responsibility. If the leak is in the street or at the meter itself, report it to your water authority (Lower Murray Water for most of the Sunraysia region). If it is anywhere on your property side of the meter, that is where Brad comes in.

To discuss a suspected leak or book an inspection, call Brad on 0411 755 399, send a message via the contact page, or see the full plumbing services Brad offers across Greater Sunraysia.