Do you know where your water main shut-off valve is located? This is your first line of defense in the event of a water emergency or flood inside your home. This valve is the main water pipe and the primary method through which water enters your home. When shut off, no water should be available to the fixtures in your home. You should test this valve regularly, so you are prepared for an emergency as the water main shut-off valve connects to your water service which connects to the water meter.