How to Turn off Sprinkler Valve
Irrigation systems obviously need a water source. Unless, of course, you have a magical irrigation system. And if your irrigation system is magical, it probably does not require maintenance the way a regular, non-magical irrigation system does.
But if your irrigation system is not magical, you are going to need to know where the water source is located. It is probably going to be in one of a few places:
Is my irrigation shut-off valve in my basement?