Quick answer: Record your water-meter reading, stop all intentional water use for a defined period, then compare the reading. A change suggests water passed through the meter, but it does not identify the source. Check for automatic water users and visible fixture leaks before assuming you have a damaged underground or slab pipe.
A rising bill or a meter that appears to move when the house is quiet can point to a leak. It can also reflect irrigation, an ice maker, a water softener cycle, a pool auto-fill or another automatic use that was easy to overlook.
A careful meter check gives a plumber useful evidence. It is a screening step—not a leak-location test and not proof that a particular pipe needs replacement.
Before you start: rule out normal water use
Choose a time when nobody needs water. Do not run faucets, toilets, showers, the dishwasher or washing machine during the check. Also account for equipment that can operate automatically:
- irrigation and drip systems;
- pool or spa auto-fill equipment;
- water softener regeneration;
- reverse-osmosis systems;
- ice makers and humidifiers; and
- appliances that may be mid-cycle.
Do not enter a flooded area, lift a heavy utility lid or reach near insects, traffic, exposed wiring or standing water. Meter access and display types vary by utility. If the meter is inaccessible or you are unsure how to read it, contact the water provider or arrange a plumbing visit.
How to check the water meter for possible leakage
- Confirm that all intentional water use is stopped. Tell everyone in the home not to use water until the check is complete.
- Record the full meter reading. A clear photo is useful. Include all displayed digits and any leak or flow indicator you can see without touching utility equipment.
- Wait without using water. EPA WaterSense guidance has long recommended comparing readings across a two-hour no-use period. Southern California’s Otay Water District repeats the same two-hour check.
- Record the reading again. Compare the numbers and indicator position with the first photo.
- Write down anything that operated unexpectedly. A toilet refill, irrigation cycle or appliance can explain the change and helps narrow the next step.
Do not turn the utility-owned meter valve or disassemble the meter. If water is actively damaging the home, skip the test and address the urgent leak.
What the result can—and cannot—tell you
| Result | What it suggests | What it does not prove |
|---|---|---|
| Reading stays the same | No metered water passed during that test window. | That there is no intermittent leak, drain leak, roof leak or moisture problem. |
| Reading changes | Water passed through the meter while use was supposed to be stopped. | That the leak is under the slab, in the yard or at the main line. |
| Flow appears only at certain times | An automatic device, irrigation or an intermittent plumbing problem may be involved. | That the meter or a specific fixture is defective. |
Meter-based flow monitoring has similar limits. The EPA’s 2026 WaterSense leak-detection guide explains that point-of-entry monitors can identify unusual water flow beyond their installation point, but they may not locate the leak and cannot identify every non-supply source, such as a drain or roof leak.
If the meter changes, check clues—not walls
Look and listen without opening walls or excavating:
- A toilet that refills by itself can lose water silently from the tank into the bowl. Precision One’s running-toilet guide explains a safe dye test.
- Check accessible faucet, toilet-supply, appliance and water-heater areas for visible moisture.
- Compare the timing with irrigation or pool schedules and look for unusually wet outdoor areas.
- Listen for water movement when the house is quiet, but do not treat sound alone as proof of a concealed pipe failure.
If water is spreading, a ceiling is bulging, flooring is lifting or moisture is near electrical equipment, keep away from the affected area and call promptly. Close an accessible fixture or main shutoff only if it is safe, familiar and turns normally. Do not force a stuck valve.
What professional leak detection should establish
When you schedule leak detection and repair, share both meter photos, the test duration, automatic water users, recent bill changes and where you have seen or heard water. Those details help separate fixture use from a pressurized supply leak.
Ask the technician:
- What evidence points to the suspected source?
- What testing and access are included?
- Is the investigation separate from the repair?
- Will drywall, flooring, concrete or landscaping restoration be separate?
- How will the repaired area be checked afterward?
If testing confirms a damaged supply pipe, the next step may be a targeted repair, reroute or a defined section of water-line repair or replacement. A moving meter by itself does not justify replacing the entire service or repiping the home.
Should you install a smart leak monitor?
A monitor can help track continuous or unusual flow and send alerts. Some systems include automatic shutoff capability. Compare the installation location, power and battery needs, alert delay, maintenance, compatibility and whether a plumber is needed. EPA notes that leak-detection and flow-monitoring devices are not currently eligible for the WaterSense label, so evaluate actual product specifications rather than relying on that label.
Need help finding unexplained water use?
Precision One Services provides plumbing leak diagnosis for Beaumont and nearby Inland Empire communities. Tell the team what changed, when the meter moved and whether water is actively spreading so the right service can be discussed.
For urgent water damage, call directly. Online requests do not guarantee immediate dispatch.
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