How do you do a water-meter leak test? Choose a time when nobody will use water, record the meter, wait at least four hours without using taps, toilets or appliances, then compare the reading. Watercare says an increased reading indicates you are likely to have a leak and should contact a registered plumber.
Water-meter leak test: step by step
- Pick a period of at least four hours with no water use; overnight can be practical.
- Record or photograph the meter reading before the test.
- Do not run taps, flush toilets, use appliances or turn off the meter tap during the test.
- Read the meter again and compare it with the first reading.
- If it has increased, contact a registered plumber to locate and repair the leak.
Read Watercare’s current official Auckland leak-test instructions for meter-specific advice.
What the test can and cannot tell you
| The test can indicate | The test cannot identify |
|---|---|
| Possible ongoing water use when no water should be used | The exact pipe, appliance or location causing the leak |
| Whether it is sensible to contact a plumber promptly | Whether walls, carpet or flooring are dry |
Illustrative scenario: a changing meter overnight
Illustrative scenario, not a customer result. A homeowner records a meter before bed and sees a higher reading in the morning despite no water use. A registered plumber investigates the source. Once the leak is repaired, affected materials can be assessed separately for drying needs.
After a confirmed leak
Use our guide to hidden water-leak signs to document affected areas. For a suitable contained clean-water event, the Drying Combo thermal and moisture check can guide dehumidifier and fan placement. Do not use equipment hire instead of resolving an active plumbing leak.
Frequently asked questions
How long should I wait during a water-meter leak test?
Watercare advises at least four hours with no water use. Overnight is often the easiest way to achieve this.
Should I turn off the meter tap for the test?
No. Watercare’s instructions say not to turn off the meter tap; you need to see whether the meter changes while water is not being used.
Does a water-meter test show where a leak is?
No. It indicates possible water use or leakage. A registered plumber should investigate and repair the source.