A water meter records water passing through it. Comparing readings during a period when nothing uses water can reveal flow you did not intend. Automatic appliances and shared supplies must be considered before interpreting the result.
In this guide
Tools and preparation
- A safely accessible meter.
- A clock.
- A way to record the reading.
Confirm how your utility displays usage.
Time is a planning estimate, not a timed field test. Material prices vary; check the correct parts and local prices before buying.
Steps and safe checks
1. Choose a no-use period
Let everyone know the test is underway. Account for irrigation, ice makers, water treatment equipment and other automatic users. Do not disable essential or safety-related systems merely to run a test.
2. Record the starting reading
Read the meter without dismantling it. Note all relevant digits, units and any leak indicator. A photo helps prevent transcription mistakes; utility smart-meter displays may refresh differently from mechanical meters.
3. Wait and compare
EPA suggests a two-hour period with no water use. Take the second reading in the same way. If it changes, first check whether any expected or automatic use occurred during the interval.
4. Narrow the investigation safely
Look at toilets, visible fixtures and accessible appliance connections. Do not dig for a buried line or close unfamiliar shared valves. Give the utility or plumber the readings and the exact test conditions.
Check the result
Unexplained movement supports further investigation. No change during this test does not exclude an intermittent leak or a leak too small for the display resolution.
Common mistakes
Comparing different digits, ignoring an irrigation cycle or treating meter movement as proof of a specific damaged pipe can lead to unnecessary work.
When to call a professional
Contact the utility about meter questions or unexplained high use. Use a plumber for inaccessible leakage, wet ground near a service line or damage requiring excavation.
What can happen if you postpone it?
An unnoticed leak can waste metered water. A meter change suggests water movement, but does not identify a pipe or justify destructive exploratory work.
Prevent a repeat
Save ordinary usage records and investigate changes promptly. A meter check is especially useful when the bill rises without a household explanation.
Sources and scope
Source check: November 4, 2026. AI-assisted educational writing checked against the linked documentation; no firsthand testing or licensed professional review is claimed. Manufacturer instructions and applicable local requirements take priority.