A sprinkler zone that will not shut off usually starts with one visible clue: water keeps running after the controller says the zone is off. In Granbury, sprinkler systems deal with heat, shifting soil, mowing damage, lake-area slope, and seasonal pressure changes, so the same symptom can come from more than one part of the system.
First separate a controller problem from a valve problem. If the controller is still sending power to the station, the issue may be a program, stuck manual run, or controller output problem. If the controller is off but water keeps moving, the valve may be stuck open, the manual bleed may be open, or debris may be holding the diaphragm from sealing.
The valve box is the key inspection point. A technician should check whether the solenoid is energized, whether the manual bleed screw is open, whether debris is caught inside the valve, and whether the diaphragm is worn or damaged. Replacing heads in the yard will not solve a zone that is staying open upstream.
This is a higher-urgency sprinkler repair request because running water can soak turf, beds, fences, sidewalks, and low areas quickly. If the irrigation shutoff is accessible and safe to use, turning off the irrigation supply can reduce water waste until the repair path is clear.
Before requesting help, write down the zone number if you know it, take a wide photo of the wet area, and note whether the issue started after mowing, digging, controller changes, freezing weather, or other yard work. Granbury homeowners can call (817) 373-5484 for routing to local sprinkler repair help.