Turn off the sprinkler system at the control module.
Locate the emergency control box for your sprinkler system if turning the standard control module off does not stop the water flow. Depending on the type of system you own, the emergency cut off valve will be contained in a square or oval-shaped box on the ground.
Open the box. Turn the valve inside the box counter-clockwise to stop the water flow.
Locate the sprinkler system's main control valve. The main control valve can be located anywhere on your property, but is generally located close to the ground in an out-of-the-way area. Open the main control valve cap.
Disconnect the electrical wiring from the main control valve. This disconnects the entire system.