Weeping Sprinkler Head: Valve Seat or Diaphragm Issue

Fixing a Continuously Leaking Sprinkler Head

One underground sprinkler head leaks water constantly, even when the system is off.

Root Cause: Valve Not Sealing

Constant weeping indicates the zone valve isn't closing completely. Common causes:

• Debris preventing diaphragm seating
• Torn or degraded diaphragm
• Worn valve seat
• Solenoid plunger stuck open

Repair Procedure

1. Shut off main water supply
2. Disassemble the zone valve
3. Clean all components thoroughly
4. Inspect diaphragm for tears, cracks, or deformation — replace if any damage found
5. Check valve seat for pitting or debris
6. Reassemble and test

If the valve body is cracked or seat is severely worn, replace the entire valve. Anti-siphon valves must be replaced as units (cannot rebuild the bonnet).