If you’ve turned off your internal stopcock and your water meter is still moving, it’s a strong signal that something isn’t right. At that point, you’ve effectively isolated your home’s internal plumbing — so any continued water usage is unlikely to be coming from inside the property.
This situation often points toward a problem on the supply pipe — the underground pipe that runs from your meter into your home.
It’s one of the clearest indicators homeowners see when trying to understand whether a leak exists beyond internal pipework.
What turning off the stopcock actually does
Your internal stopcock shuts off water flow into your home’s plumbing system.
This means:
- No water should be entering taps, appliances, or internal pipework
- All internal usage is effectively stopped
- Any continued flow must be happening elsewhere
So if the meter is still registering movement after the stopcock is off, it suggests water is escaping before it reaches your internal system.
If you want to understand how supply pipe leaks develop in this section, see mains water leaks explained.
Why this often points to a supply pipe leak
The supply pipe sits between your water meter and your home. If water is flowing when your internal system is isolated, the leak is likely somewhere along that route.
This is because:
- The meter measures all water passing through it
- The stopcock prevents water entering your home
- Any movement after isolation indicates water loss before the property
In simple terms, the system has been narrowed down — and the supply pipe becomes the most likely cause.
Could anything else cause the meter to move?
There are a few rare scenarios, but they are far less common.
These might include:
- A faulty or partially closed stopcock
- A shared supply arrangement affecting readings
- Very minor residual movement immediately after turning off the supply
However, if the meter continues to move consistently, it’s usually a strong indication of a leak rather than a fault.
What you should do next
At this point, the goal is not to guess — it’s to confirm the leak properly and locate it accurately.
The Leak Hunter will pinpoint the exact position of the leak on your supply pipe and guide you toward the most effective repair, without unnecessary disruption.
This involves:
- Confirming the leak is on the supply pipe
- Tracing the pipe route underground
- Pinpointing the exact leak location
To see how this is done, visit how we find mains water leaks.
Why this situation shouldn’t be ignored
Even if there’s no visible damage, a supply pipe leak will continue as long as water is flowing through the system.
Over time, this can lead to:
- Increased water bills
- Ground softening around the pipe
- Potential damage to surfaces above
Because the leak is continuous, early confirmation and repair help keep the situation controlled.
What happens once the leak is confirmed
Once the leak is located, the next step is choosing the right repair approach.
This could involve:
- A targeted repair to the affected section
- Replacing part of the pipe if needed
- Planning access to minimise disruption
You can read more about this stage here: what happens after a mains water leak is found.
Final thoughts
If your stopcock is turned off and your meter is still moving, it’s one of the clearest signs that water is escaping somewhere before it reaches your home.
The key is not to rely on assumption — but to confirm the exact cause and location properly.
Once identified, the problem becomes much easier to resolve, and you can move forward with a clear, controlled plan.
To understand how we diagnose and resolve supply pipe leaks from start to finish, visit mains water leak detection.
Frequently asked questions
Do you only cover my area?
If you’re outside these areas, don’t worry — our team covers most of the South East, providing trusted leak detection services throughout London, Kent, Sussex, and Surrey.
Does a moving meter always mean a leak?
Not always, but if the stopcock is off and the meter continues to move, it strongly suggests water loss on the supply pipe.
Can I ignore it if I can’t see any damage?
It’s not recommended. Supply pipe leaks can remain hidden but continue to waste water and worsen over time.
Will this require digging?
Not necessarily. The repair approach depends on the location and condition of the pipe, which is confirmed through proper detection.