Low Pressure from a Sprinkler Pump After Long Idle Period

A 20-year-old, six-zone irrigation system with a 1 HP pump and a 45-foot-deep well suddenly delivers barely any flow after six months of inactivity. The pump runs but cannot build enough pressure to pop up the rotor heads. Priming and extended running did not help.

Primary Suspect: Foot Valve Blockage

The foot valve (check valve) at the end of the suction line in the well is likely plugged with debris, sand, or mineral buildup. This restricts water entry into the pump, causing low flow and pressure.

Next Steps

• Verify all valves on the suction and discharge lines are fully open.
• Pull the suction line to inspect and clean the foot valve. This often requires a well service professional.
• Check for suction line leaks that could introduce air and break prime.

If the foot valve is clear, the pump impeller or wear rings may be worn after two decades of service.