A water bill that 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 the usage is well up on 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
Concealed leaks hurt because they never stop. A small, constant drip runs 24 hours a day, seven days a week, and it adds up fast. A pinhole leak in a pipe under your slab can waste hundreds of litres every single day. Over a three-month billing period, that’s tens of thousands of litres — enough to fill a small swimming pool — all of it billed to you. Left alone, a hidden leak can also cause structural damage, rot timber, lift flooring and feed persistent mould, turning a plumbing problem into a much bigger repair job.
The warning signs worth watching for
The clearest early signal is your water bill itself. If your usage has climbed but your habits haven’t, treat that 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 explanation.
- Paint that bubbles or blisters, or skirting boards and floorboards that feel soft or look warped.
- A musty, damp smell in a particular room, or mould that keeps returning in the same spot after you clean it.
- The sound of running or trickling water when all your taps are turned off.
- A warm patch on the floor, which can point to a leak on the hot water line under the slab.
- Reduced water pressure that has crept in over time.
A quick DIY check: turn off every tap and water-using appliance in the house, then look at your water meter. If the dial is still ticking over, water is going somewhere it shouldn’t.
Don’t forget gas leaks
Water isn’t the only thing that leaks. A gas leak is a genuine safety hazard, and the warning signs are different — a rotten-egg smell near a gas appliance or meter, a hissing sound, or a gas bill that’s higher than it should be. If you ever smell gas strongly, don’t switch anything electrical on or off, get everyone outside, and call for help. Gas work is not a DIY job and must be handled by a licensed gas plumber.
How professional leak detection works
The days of guessing and cutting open walls are long gone. Licensed plumbers now use non-invasive methods to pinpoint a leak before lifting a single tile. Acoustic listening equipment picks up the sound of water escaping under pressure, thermal imaging reveals moisture behind surfaces, pressure testing isolates which section of pipe is failing, and CCTV cameras inspect underground drains and service lines. Combined, these tools locate a leak precisely, which means the repair is targeted rather than destructive.
Why detection and repair should be one job, not two
Here’s something many Perth homeowners don’t realise until they’re in the middle of a problem: many companies only do the detection. They’ll find the leak, hand you a report, and then you’re left to arrange a separate plumber to actually fix it — two visits, two call-out fees, and days of waiting in between while the leak keeps running.
Plumbdog does both. They detect the leak and repair it, water or gas, in one process. Because they’re licensed gas plumbers as well as water specialists, they can safely handle a suspected gas leak and a hidden water leak alike, without needing to refer you elsewhere. That means the problem is found and fixed by the same team, faster and usually for less than juggling two separate providers.
What to do if you suspect a leak
If your bill has spiked or you’ve spotted any of the signs above, act sooner rather than later — a hidden leak only gets more expensive the longer it runs. Do the meter test to confirm water is moving with everything off, note where you’ve seen damp or heard water, and then call a licensed plumber who can both locate and repair the problem in one go.
Plumbdog’s team specialises in finding hidden water and gas leaks across Perth and fixing them on the spot — no second call-out, no waiting on another contractor. As licensed gas plumbers who handle both detection and repairs, they can get to the bottom of a mystery water bill quickly. Find out more about their leak detection services in Perth and put your mind at ease.
