Turn off the water supply To turn off the water supply to the toilet, rotate the shutoff valve clockwise. This valve is typically found on the wall behind the toilet or on the floor. Empty the water ...

Step 2: Drain the water lines. Before you remove the toilet shut-off valve, you’ll need to drain the supply line to prevent the water remaining in the pipe from gushing out onto your bathroom floor.

The average loss he observed was about $100,000. He described one loss – of about $500,000 – suffered by one couple whose toilet supply line failed shortly after they left for vacation.