Water Continues to Flow After Irrigation Shutoff – Replace the Main Valve

Shutoff Valve Not Holding

After closing the main irrigation shutoff valve, water still flowed from spigots at lower elevations. Opening an uphill spigot stopped the flow at the lower one, indicating the shutoff valve is leaking by.

Risk of Debris in New Valves

Installing new automatic valves while water is still trickling through the pipes is a major risk. Dirt and stones will enter the new valves, causing future failures.

Solution

Replace the main irrigation shutoff valve before any other work. Ensure it provides a positive, drip-tight seal. Only then proceed with the valve replacement project.