Why Turning Off The Controller Is Not Enough
When a sprinkler head breaks or a valve gets stuck open, many homeowners assume that simply turning off the irrigation controller will stop the water. However, the controller only sends electrical signals to open and close the valves. If a valve diaphragm is stuck open due to debris or mechanical failure, or if a main line pipe is broken before the valves, water will continue to flow regardless of the controller's setting.[1][1][2]
To actually stop the flow of water during an emergency, you must physically shut off the water supply to the irrigation system. Relying solely on the controller can lead to thousands of gallons of wasted water and significant property damage while you wait for a repair.[2]
Locating And Operating The Backflow Preventer
The most effective way to shut off water to your landscaping without affecting the water supply to your house is to use the backflow prevention device. This device is typically located on the side of your home, near the main water line entry point. It features two shut-off valves with handles that are normally parallel to the pipe, indicating that water is flowing.[1][2]
To shut off the water, turn either of the handles a quarter turn so that it is perpendicular to the pipe, forming a plus sign (+). This action immediately stops the flow of water from the main line to the entire irrigation system. Once the water is off, you can safely assess the damage or wait for a professional repair without wasting water or flooding your yard.[2][3]
When To Call A Phoenix Irrigation Expert
While shutting off the backflow preventer is a straightforward task for most homeowners, there are situations where professional help is necessary. In some older Phoenix homes, the backflow handles may be rusted or stuck from years of sun exposure and hard water buildup. Attempting to force a stuck handle can break the valve, creating an even larger water emergency that requires immediate plumbing repair.[1][3]
If you cannot locate your backflow preventer, if the handles will not turn, or if water continues to leak after shutting the valves, it is time to call a licensed irrigation professional. A specialist can safely shut off the water at the main meter, diagnose the underlying cause of the leak, and perform the necessary repairs to restore your system.[2][3]