Ensure that the water tank is completely connected to the submersible pump in the well.
Examine the water tank to find either the valve in the bottom of the tank or remove the plug.
Ensure that all the water valves connected to the tank are turned off to prevent the pump from turning on while opening the valve.
Remove the plug or unscrew the valve opening slowly at the bottom of the small water tank.
Allow the water to completely drain until the pump begins to fill it back up. Replace the cap securely either by pressing it in or screwing it.