Can an irrigation valve be repaired or does it need replacing?

Many residential valves can be repaired. Grit on the seat, a torn diaphragm or a failed solenoid can usually be fixed with a cleaning, a rebuild kit or a new solenoid. A cracked body, stripped bonnet or a valve buried with no box is a stronger case for replacement.

What should I do if a zone keeps running and will not stop?

Turn off the water to the irrigation system at its shutoff, which on many homes is at the backflow device on the irrigation supply, then have the valve repaired. Turning the controller off will not help if the valve is stuck open mechanically, because the controller only sends the signal.

Valve and Solenoid Repair

Fix a zone valve that will not open, will not close, or weeps into its box between cycles.

Request an estimate(623) 624-0780

A valve fails in one of two directions

Every zone is switched by a valve. The controller sends a low-voltage signal to the solenoid, the solenoid lets water move off a diaphragm, and the valve opens; when the signal stops, the diaphragm seats and the zone shuts. A failure goes one way or the other: the valve will not open and the zone stays dry, or it will not close and the zone keeps running or seeps long after the program ends.

The City of Peoria's water conservation page describes the second case plainly: a stuck valve can make the system run endlessly, and the first step is to turn off the outdoor water at the backflow device, then repair the valve. Peoria places backflow devices on the supply line as close as possible to the water meter, which is where to look for that shutoff. Knowing where it is before the emergency is most of the battle.

From a dry or flooded zone to a working one

A zone that will not open is traced from both ends. At the controller the station is run by hand; at the valve the solenoid is checked and the manual bleed is tried. If the valve opens on the bleed but not on command, the problem is electrical, in the solenoid, a splice or the wire run. If it will not open either way, the problem is inside the valve.

A valve that will not close is opened up for grit on the seat, a torn diaphragm or a worn plunger. Peoria's supply blends Colorado River, Salt and Verde river and well water, and fine grit is a normal suspect in a valve that weeps. Most residential valves can be rebuilt or fitted with a new solenoid; a cracked body or a valve buried without a box is replaced into a box that can be opened next time. After the repair the zone runs a full cycle and the box is checked for weeping once it shuts. Related work: irrigation controller repair and irrigation leak detection.

Source: City of Peoria, Water Conservation, Checked Oct 1, 2026