A zone that keeps running or seeping after the controller turns it off almost always has a valve problem: a torn diaphragm, debris stuck in the valve seat, or a failed solenoid. Close the main irrigation shutoff to stop the water, then call (509) 986-4262. In the Spokane area a leaking zone valve repair typically runs $100 to $250 as of 2026.
What to do right now
- Turn the controller to off. If the zone stops, the controller or its program was the cause.
- If water still runs, close the main irrigation shutoff valve. That stops the water until the valve is repaired.
- Look at the valve box for that zone. A manual bleed screw left open will also keep a zone running; close it gently.
Why valves stick open
A small tear in the rubber diaphragm, a pebble or bit of pipe debris in the seat, or a solenoid that has failed in the open position. All three are common after spring startup, when debris moves through the lines.
What the repair involves
We find the valve (even when the box is buried), clean or replace the diaphragm or solenoid, or replace the valve if the body is cracked, then run the zone to confirm it closes.
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