Low water pressure is one of the most common irrigation system complaints in Calgary. When your system lacks pressure, heads don't pop up fully, rotors spin slowly or not at all, and coverage gaps create dry patches in your lawn. This guide covers the most common causes of low irrigation pressure in Calgary and what to do about each one.
Calgary Irrigation Low Pressure — Diagnosis Guide
| Symptom | Most Likely Cause | Solution |
|---|---|---|
| All zones low pressure | Backflow preventer partially closed or PRV set too low | Open backflow handles fully; adjust PRV |
| One zone low pressure | Too many heads on zone, broken head in zone, or zone valve partially open | Inspect zone heads, test valve operation |
| Pressure drops mid-cycle | City water pressure fluctuation or mainline leak | Check with pressure gauge; call J.G. Irrigation for mainline test |
| Heads barely pop up | Static head count too high for the zone flow rate | Split zone into two, or reduce head count |
| Morning pressure lower than evening | All neighbours watering at same time (City water demand peak) | Reschedule to 4-6am or after 7pm |
Calgary's municipal water pressure at the street is typically 60-80 PSI. Most residential irrigation systems need 45-65 PSI at the valve to operate optimally. Pressure losses through the backflow preventer, mainline, and each zone account for 10-20 PSI drop. If your system pressure is low, J.G. Irrigation can perform a pressure test and zone flow analysis. Call 587-433-4795.
Irrigation Pressure Problem Calgary — Professional Diagnosis
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