Water Bill Suddenly Higher? How to Spot a Hidden Leak in Your Perth Home Before It Costs You Thousands

A water bill that suddenly jumps for no obvious reason is one of the most common ways Perth homeowners discover they have a hidden leak. Nobody has filled a pool, the garden reticulation hasn’t changed, yet water usage is significantly higher than during the same quarter last year. Often, the culprit is a slow leak you can’t see — under a slab, behind a wall, or in an underground service line — quietly wasting water and money around the clock. Here’s how to recognise the signs early and what to do about them.

Why hidden leaks are so expensive

The reason concealed leaks can be so costly is that they may continue unnoticed for long periods. A small, constant leak can run 24 hours a day, seven days a week, and the wasted water quickly adds up. A pinhole leak in a pipe under your slab, for example, can waste hundreds of litres every day. Over a three-month billing period, that can amount to tens of thousands of litres — potentially enough to fill a small swimming pool — all of which may be reflected in your water bill.

Left untreated, a hidden leak can also cause structural damage, rot timber, damage flooring and contribute to persistent mould growth, turning a plumbing problem into a much larger repair job.

The warning signs worth watching for

The clearest early warning sign is your water bill itself. If your usage has increased but your household habits haven’t changed, treat it as a red flag rather than a fluke. Beyond the bill, keep an eye out for:

• Damp or discoloured patches on walls, ceilings or floors that appear without an obvious explanation.
• Paint that bubbles or blisters, or skirting boards and floorboards that feel soft or appear warped.
• A musty or damp smell in a particular room, or mould that keeps returning to the same spot after cleaning.
• The sound of running or trickling water when all your taps are turned off.
• A warm patch on the floor, which may indicate a leak in a hot-water line beneath the slab.
• Reduced water pressure that has gradually developed over time.

A quick DIY check can help confirm whether water is flowing when it shouldn’t be. Turn off every tap and water-using appliance in the house, then check your water meter. If the meter is still moving, water may be escaping somewhere it shouldn’t.

Don’t forget gas leaks

Water isn’t the only thing that can leak. A gas leak is a serious safety hazard, and the warning signs are different. These may include a rotten-egg smell near a gas appliance or meter, a hissing sound, or an unexpectedly high gas bill.

If you smell gas strongly, don’t switch electrical appliances or switches on or off. Get everyone outside and seek professional help immediately. Gas work is not a DIY job and should only be carried out by a licensed gas plumber.

How professional leak detection works

Modern leak detection doesn’t always require guesswork or extensive excavation. Licensed plumbers can use a range of non-invasive methods to help pinpoint a leak before lifting tiles or opening walls.

Acoustic listening equipment can detect the sound of water escaping under pressure, while thermal imaging can help identify temperature changes associated with moisture or leaking hot-water pipes. Pressure testing can help isolate the section of pipe that may be failing, while CCTV cameras can be used to inspect certain underground drains and pipework.

Used together, these methods can help locate a leak more precisely, allowing repairs to be targeted and potentially reducing unnecessary damage to your property.

Why detection and repair should be one job, not two

Here’s something many Perth homeowners don’t realise until they’re dealing with a leak: some companies specialise in detection but don’t carry out the repair themselves. They may locate the leak and provide a report, leaving you to arrange a separate plumber to fix it. That can mean another visit, another call-out fee and additional waiting while the leak continues.

Plumbdog offers both leak detection and repair. They can detect and repair water and gas leaks as part of the same service. As licensed gas plumbers and water specialists, they can also handle suspected gas leaks safely without requiring you to arrange a separate contractor.

Having the same team identify and repair the problem can make the process simpler and help reduce delays between detection and repair.

What to do if you suspect a leak

If your water bill has suddenly increased or you’ve noticed any of the warning signs above, act sooner rather than later. A hidden leak can become more costly the longer it remains undetected.

Start with the water-meter test to check whether water is being used when everything is switched off. Make a note of any damp patches, unusual sounds, smells or changes in water pressure, and then contact a licensed plumber who can locate and repair the problem.

Plumbdog’s team specialises in detecting and repairing hidden water and gas leaks across Perth. By handling both detection and repairs, they can help identify the source of a mystery water bill and address the underlying problem without the need to coordinate multiple contractors.

Find out more about their leak detection services in Perth and get professional help before a small leak becomes a much bigger problem.

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