Signs of a hidden water leak and how to detect one
Hidden leaks are easy to miss until they cause real damage. Here are the signs to look for and how professional leak detection finds the source.
Not every leak is visible. Water can escape behind walls, under floors, or inside the pipework without you noticing until the damage is done. Catching a hidden leak early can save you from costly repairs and rising water bills.
Here are the tell-tale signs to watch for and how professional leak detection finds the source without tearing the place apart.
Tell-tale signs of a hidden leak
Look out for these clues:
- Unexplained damp or staining on walls, ceilings or floors.
- A musty smell that lingers in a room.
- Higher-than-usual water bills for no obvious reason.
- Low water pressure that appears suddenly.
- Persistent condensation or a patch that never dries.
- A constantly running or trickling sound in the pipework.
If you notice several of these, it is worth investigating before the problem spreads.
How to check for yourself
You can do a simple meter test. Turn off all taps and water-using appliances, note the reading on your water meter, and leave the property untouched for an hour. If the meter is still ticking over, water is going somewhere.
You can also check visible pipework under sinks, behind appliances, and around the boiler for drips or damp.
Where hidden leaks hide
The most common places are:
- Behind walls and under floors in bathrooms and kitchens.
- Around appliances such as washing machines and dishwashers.
- In pipework under the ground between the meter and the property.
- Near radiators, valves and the boiler.
- In waste pipes where a joint has failed.
Why professional leak detection is worth it
A leak detection specialist uses moisture metres and listening equipment to pinpoint the source without unnecessary excavation. Finding the exact location first means the repair is targeted and the damage is limited, which usually saves money compared with guessing and opening up walls.
If you suspect a hidden leak, our plumbing service can trace the source and carry out the repair. The Thames Water website also explains how to check for leaks on the supply side and how to report one outside your property.
