Low water pressure is one of the most common complaints J.G. Irrigation hears from Calgary homeowners — “my heads aren't popping up fully” or “the spray only reaches half the lawn.” This guide covers every cause of low pressure in a Calgary residential irrigation system and how to fix each one.
Calgary Sprinkler System Low Pressure — Diagnosis Table
| Cause | How to Identify | Fix |
|---|---|---|
| Too many heads on one zone | All heads on zone spray weakly simultaneously | Split zone — add a valve and re-pipe to 2 zones |
| Partially closed backflow preventer | Pressure drop at system, not zone-specific | Open ball valves fully — 90° to pipe = fully open |
| Debris in head filter screens | One head sprays weakly, others fine | Remove head, clean screen — 5 min DIY fix |
| Municipal pressure issue (Calgary) | Whole house low pressure, not just irrigation | Call City of Calgary — may be planned maintenance |
| Cracked supply pipe underground | Wet spot in lawn, pressure drop system-wide | Excavate and repair — $200-$600 |
| Pressure regulator failing | Pressure varies day-to-day on same zone | Replace PRV — $150-$300 installed |
Calgary's municipal water pressure is typically 55-80 PSI at the meter — enough for most residential irrigation systems. If your system has low pressure, the cause is almost always internal to your system rather than the city supply. J.G. Irrigation can perform a full pressure diagnostic for $90-$120 (applied toward any repair). Call 587-433-4795.
What PSI does a Calgary sprinkler system need?
Most residential Calgary irrigation systems need 45-65 PSI at the zone valve to operate correctly. Fixed spray heads need 30-45 PSI; rotors need 45-65 PSI; drip zones typically run at 25-30 PSI with a pressure regulator. Systems with mismatched pressure to head type waste water or underperform. J.G. Irrigation can pressure-test and balance your system: 587-433-4795.
Calgary Sprinkler Pressure Diagnosis — Same-Day Available
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