1. Locate the Water Supply Valve:
- Identify the main water supply valve that controls the water flow to the tank. This valve is usually located near the water source, such as a sink, toilet, or water heater.
2. Turn Off the Water Supply:
- Once you have located the water supply valve, turn it off. This can usually be done by rotating the valve handle clockwise (to the right) until it stops turning.
3. Check if the Water Has Stopped Filling:
- After turning off the water supply valve, go back to the tank and check if the water has stopped filling. If the water level remains constant and doesn't continue to rise, then the water supply has been successfully shut off.
4. Investigate the Cause:
- Once the water supply is turned off, it's essential to investigate the reason behind the continuous filling of the tank. This could be caused by various issues, such as a faulty ball cock (ball valve) or float switch, which should be inspected and repaired or replaced if necessary.
Remember, these steps provide a general guideline. Specific plumbing systems might have slight variations, so always refer to the instructions or seek professional help if needed. By turning off the water supply, you can prevent the tank from overflowing and cause unnecessary water damage.