Shutoff valve types
There are two types of main shutoff valves for a main water line. Gate valves (top) are common in older homes. The valve closes when a wedge-shaped brass gate is lowered into a slot. Ball valves (bottom), which contain a pivoting stainless steel ball with a hole drilled through the center, are less prone to wear.
Figure A: Outdoor shutoff map
In warmer climates, the main water shutoff is typically outside, attached to an exterior wall or in an accessible underground box.
Figure B: Indoor shutoff map
In colder climates, the main water shutoff is typically in the basement.
Shutting off the main valve that controls all the water for your home is the best protection against catastrophic water damage. Everyone in your home should know where the main water shutoff valve is located so they can stop the water in an emergency. And you should turn it off whenever you leave home, even overnight. If you’re not sure where it is, look for your water meter; the main shutoff will be located nearby.
