Why One Sprinkler Zone Stopped Working Overnight

Sudden Zone Failure After Sprinkler Head Maintenance

A homeowner cleared grass over sprinkler heads in one zone; they worked perfectly that evening. Next morning, the zone has almost no pressure. Nothing was done in between.

Most Likely Cause: Accidental Damage During Cleanup

Digging around heads to remove grass can easily:

• Crack a lateral pipe
• Break a sprinkler body
• Dislodge a fitting

Even a small leak underground can drop pressure enough to prevent heads from popping up.

How to Find the Leak

1. Turn on the zone.
2. Probe around each head with a shovel or soil probe.
3. Look for soggy soil, bubbling water, or unusually green patches.
4. Check the valve box for leaks too.

Since the zone worked right after the work, the damage is almost certainly in that immediate area. Repair the broken pipe or head, and pressure should return.