Troubleshooting Low Water Pressure in Two Irrigation Stations

Diagnosing Low Pressure on Specific Sprinkler Zones

As a new homeowner, discovering that two of your six irrigation stations aren't popping up properly can be frustrating. Low pressure on isolated zones usually points to a localized issue rather than a system-wide problem. Here’s a step-by-step approach to identify and resolve the cause.

Check Valve Operation

Begin by verifying that the valves controlling the affected stations are fully open. Sometimes valves are only partially opened during installation or maintenance. Turn the valve solenoid or flow control knob counterclockwise until it stops to ensure maximum flow.

Inspect for Hidden Restrictions

Look for any additional shutoff valves on the supply lines feeding those two stations. A partially closed gate valve or ball valve upstream can drastically reduce pressure. Also examine the wiring connections at the valve box—loose or corroded wires can prevent the valve from opening fully. Ensure all wire splices are waterproof with gel-filled connectors.

Evaluate Sprinkler Heads and Nozzles

Remove the sprinkler heads on the problematic zones and run the system briefly. If water flows freely without the heads, the issue may be clogged nozzles or incorrect nozzle selection. Clean or replace nozzles, and confirm they match the zone’s precipitation rate and pressure requirements.

Consider Hydraulic Limitations

If the two zones are at the end of a long lateral line, friction loss could reduce pressure. Check pipe sizing and consider reducing the number of heads or switching to lower-flow nozzles on those stations.

By systematically checking valves, wiring, and hydraulics, you can restore proper pressure and achieve even coverage across all six stations.