Meter movement means water is passing somewhere
If the meter continues to register flow when you believe every outlet is off, the first thought is naturally a leak. That is possible, but start by making sure nothing has been overlooked. Toilets can leak silently into the pan, water softeners may regenerate automatically, appliances can fill briefly and outside taps or garden systems may be connected out of sight. Record the meter reading, leave all water use stopped for a sensible period, then check again. A tiny movement over a few seconds is less informative than a clear change over ten or twenty minutes.
Toilets are worth checking before hidden pipes
A modern toilet can pass water from the cistern straight into the bowl without creating a puddle. The inlet valve then replaces that water, causing the meter to move intermittently. Look for a faint trickle down the back of the pan or listen for periodic refilling. If the property has more than one toilet, check them all. This simple fault can account for continuous low-level water use and is much easier to repair than a buried supply pipe.
Use the internal stopcock as a dividing point
If you know where the main internal stopcock is and it operates correctly, closing it can help establish whether the apparent flow is inside or before the property. If the meter still moves with the internal supply shut, the issue may lie on the service pipe between meter and stopcock, or the meter may serve more than one supply depending on the property arrangement. Do not force a seized valve for the sake of this test. If the stopcock is unreliable, that deserves attention in its own right.
Shared supplies can complicate the picture
Some older terraces, converted properties and flats have shared incoming water arrangements. A meter thought to serve one home may be positioned in a chamber with several others, and identifying the correct one is not always obvious. Check the meter serial number against the bill rather than relying only on location. If turning your internal stopcock does not alter the meter flow as expected, speak to the water company before assuming there is a concealed leak beneath your floor.
What a plumber can do next
Once obvious water use has been ruled out, a plumber can isolate branches and compare the meter response. That may identify whether the leak is on a toilet feed, hot-water branch, outside supply or another part of the system. If the suspect section is buried or inaccessible, specialist detection may be appropriate before floors or walls are opened. The aim is to reduce the search area systematically. Replacing random fittings because they look old rarely helps with a meter-only symptom.
Keep a simple record of the readings
Write down the exact reading and time, then repeat the test under the same conditions. If possible, photograph the meter so there is no doubt about the digits or indicator position. Tell the plumber whether the movement is steady or occasional and whether shutting the internal stopcock changes it. Also mention recent unusually high bills. Those details distinguish a genuine continuous loss from small normal bursts of appliance use and give the investigation a much clearer starting point.
Separate normal consumption from genuine continuous loss
A meter test is most useful when conditions are controlled. Choose a time when nobody needs water, turn off appliances that may fill automatically and avoid running taps or flushing toilets during the test period. If a water softener, irrigation system or automatic filling device is installed, account for that as well. Repeat the check rather than relying on one brief glance. A steady meter movement over repeated tests is much stronger evidence than a single twitch of the indicator. If the water company offers advice about meter testing or suspected supply-pipe leakage, their information can help establish whether the issue sits before or after your internal stopcock. Bringing those readings to a plumber gives them something measurable to work from and reduces the chance of searching the property for a leak that is actually an unnoticed appliance or toilet fault.
This page is general guidance about why is my water meter moving when everything is turned off; the cause in an individual property depends on the actual plumbing arrangement.