Is it one zone or all of them?
If only one zone has low pressure, the cause is local — a leak in that zone's lateral, a partially open valve, or clogged heads. If every zone is weak, the issue is upstream: the main supply, pump, or pressure regulator.
Check for leaks
A cracked pipe or weeping valve bleeds off pressure before it reaches the heads. A soggy patch of lawn or an unusually green circle often marks an underground leak.
Inspect nozzles and screens
Clogged nozzle screens from sand and debris are a top cause of low pressure on individual heads. Cleaning or replacing nozzles often restores coverage.
Evaluate the pump
On pump systems, a worn impeller, failing motor, or suction problem reduces output to every zone. A pump losing prime or short-cycling needs professional attention.
Need help with irrigation repair?
If troubleshooting points to a part failure, our licensed technicians can help.