Why does my sprinkler system pulsate?
Pulsing or surging usually points to air in the line, a failing valve, or pressure that swings up and down. It can also be a sign of water hammer: a shock wave when a valve closes quickly.
How to fix water hammer in a sprinkler system
Water hammer happens when a valve slams shut and the moving water has nowhere to go. Slowing the valve’s closing with its flow control, lowering line pressure with a regulator, and checking for loose or unsupported pipe all help. If a timer or valve sequence closes zones back to back, a gap between stations can help too.
What a sprinkler pressure regulator does
A pressure regulator holds the pressure at the sprinkler system at a safe, steady level. Heads are designed for a range of pressure, and many spray heads are designed for around 30 psi at the head; check the spec for your heads. Pressure that is too high shows up as misting or fogging, heads that blow apart and fittings that fail.
Why is my sprinkler system low pressure?
If one zone is weak, look for a leak, a partly closed valve or a clogged head. If every zone is weak, check the supply, any filter or backflow device, and old corroded pipe. Read our guide on finding a line leak.
Pressure in older neighborhoods
We see pressure problems and old galvanized pipe in older neighborhoods such as Old Fig Garden. A free inspection includes a look at pressure.
Written by ACRE Landscape Co., Fresno & Clovis. Updated October 26, 2026.