There is not leakage in the toilet basin, but the sound of running water in the drain pipe can be he

You can turn off the water inlet switch or inlet valve of the toilet, if there is no sound of water and the meter does not go, it is the problem of the toilet, and then analyze the toilet.

It should be that there is a problem with the water level limit of the toilet.

This should be the drain valve of your toilet that is not sealed, and then there is a water leak out, you can open the toilet to store water in the box to check, generally this kind of problem.

It may be a problem with the water valve, but there are several situations 1. The toilet does not leak, but there is a subtle sound of running water, and it may be that the water tank of the toilet has been storing water. For example, some people have old-fashioned toilets in their homes, and when they press the button, if they don't reset the button, that is to say, the button is recessed, so that the water in the tank is always in a state of water storage, so it will be flowing all the time inside the tank, which will cause a lot of waste of water resources. 2. It is also possible that there is a problem with the water scoop inside the water tank, and there is a hose outside that is used to connect the water tank, if it is damaged or not tightened in this place, it will also cause the water tank to have the sound of running water.