The Water Meter Test: Find Out in 30 Minutes Whether You Have a Hidden Leak

Most leaks we find in homes are invisible. Water escapes from a pipe under the tiles, inside a wall or on the tank line, and you only notice when the bill arrives or a damp patch appears months later. The good news is you already have a free leak detector at home: your water meter. Here is how to run the test and read the result.

Before you start: prepare the house

The test relies on one idea: if everything is off and the meter still moves, water is going somewhere you can't see. So:

• Close every tap and shower, inside and outside.
• Stop the washing machine, dishwasher and anything else that uses water.
• Make sure no toilet cistern is refilling.
• If you have an RO filter under the sink, close its valve — it drains water while it runs.

Tip: run the test late at night or early in the morning, when nobody is using water.

The test, step by step

1. Read the meter and take a photo

Most meters have a small star or wheel indicator that turns even with a tiny flow.

2. Wait 30 minutes

Don't open any tap. For a more accurate result, wait an hour.

3. Compare

• Same numbers, indicator still: no leak on the lines after the meter.
• Indicator creeping slightly: a small leak — often a cistern or a dripping tap.
• Numbers clearly changed: a real leak that needs checking soon.

Found a leak? Narrow it down

1. Close the tank or pump valve and repeat. If the meter stops, the leak is probably on the tank line or float valve.
2. Close bathroom valves one by one. The bathroom that stops the meter is the culprit.
3. Put a few drops of food colouring in the cistern and wait 15 minutes without flushing. Colour in the bowl means the cistern leaks.
4. Look for signs: damp at the bottom of walls, hollow-sounding tiles, or running water noise in a quiet house.

Why not wait?

A hidden leak never fixes itself. Under the tiles it means damp that ruins tiles and paint, water reaching the structure, a bill that keeps rising — and in apartments, water dripping into your neighbour's ceiling.

How we find leaks without breaking

With our leak detection service we use a thermal camera, an acoustic listening device and a moisture meter. Once we pinpoint the spot, we open only there instead of breaking up the whole bathroom.

FAQ

The meter moves only a little — is that normal?

No. Any movement with everything closed means water is going somewhere. It may be minor, but it's worth knowing why.

Can I do the test in an apartment?

Yes, if your apartment has its own meter. With a shared building meter the result isn't reliable and equipment testing is needed.

Summary

The meter test takes half an hour and can save you money and breaking. If it shows a leak, contact us and we'll bring the detection equipment.