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.
Here is the FAQ in the **same styled HTML + FAQPage schema format** you used earlier:
Frequently Asked Questions (FAQs)
1. Why has my Perth water bill suddenly increased?
A sudden increase in water usage can be caused by a hidden leak, changes in garden reticulation, increased household use or other plumbing issues. If your habits haven’t changed, checking for a leak is a sensible first step.
2. How can I tell if I have a hidden water leak?
Common signs include an unexplained increase in water usage, damp patches, recurring mould, warped flooring, unusual sounds of running water, warm areas on floors and gradually reduced water pressure.
3. How do I check my water meter for a leak?
Turn off all taps and water-using appliances in your home, then check the water meter. If the meter continues moving while no water should be in use, there may be a leak somewhere on your property.
4. Where can hidden water leaks occur in a Perth home?
Hidden leaks can occur under concrete slabs, behind walls, beneath floors, in underground pipework, around bathrooms and kitchens, or along water service lines that are difficult to inspect visually.
5. What damage can a hidden water leak cause?
An untreated leak can waste water and contribute to dampness, mould growth, damaged flooring, timber rot and other property damage. Finding and repairing the source early can help limit the extent of the damage.
6. What methods are used for professional leak detection?
Professional plumbers may use acoustic equipment, thermal imaging, pressure testing and CCTV inspections to help identify the location and source of certain hidden leaks without unnecessary damage to the property.
7. Can a plumber detect and repair a hidden leak?
Yes. Depending on the plumber and the nature of the problem, the same service provider may be able to locate the leak and carry out the necessary repair, which can simplify the process for homeowners.
8. What should I do if I suspect a gas leak?
If you strongly suspect a gas leak, avoid creating sparks or operating electrical switches, move everyone to a safe location and contact the appropriate emergency or licensed gas service. Gas-related work should only be carried out by qualified professionals.
9. Can a hidden leak cause a high water bill?
Yes. A leak that continues for long periods can significantly increase water consumption, particularly when it is located somewhere that isn’t immediately visible.
10. When should I call a plumber for a hidden leak?
Contact a licensed plumber if your water usage has increased without explanation, your meter continues moving when everything is turned off, or you notice signs such as dampness, mould, unusual sounds or reduced water pressure.