Irrigation backflow assembly
Also known as: irrigation PVB, sprinkler backflow
Backflow preventer specifically required at the connection between potable water supply and irrigation system. Annual testing required by most municipalities.
Irrigation systems require backflow protection at the connection to the potable water supply. Without protection, contaminated water from the irrigation system (containing fertilizer, pesticide, soil, animal waste) could flow backward into the drinking water supply during back-pressure or back-siphonage events.
Common types for irrigation: pressure vacuum breaker (PVB) — most common for residential, requires installation 12 inches above highest sprinkler head; reduced pressure zone (RPZ) — required for commercial and high-hazard applications, more expensive but offers more protection; double-check valve assembly (DCVA) — used in some jurisdictions for low-hazard residential applications.
Most municipalities require annual testing by a certified backflow tester, with test results submitted to the local water authority. Failed devices must be repaired or replaced before the system can be used. For irrigation operators, backflow testing certification (typically 16-hour course + exam) opens a recurring service line — annual tests at $75-$150 per device, multiplied across the customer base, is meaningful recurring revenue.
Related terms
Irrigation zone
A grouping of sprinkler heads controlled by a single valve. Zones allow different areas of a landscape to receive different watering schedules and durations.
Backflow preventer
Plumbing device that prevents contaminated water from flowing backward into the potable water supply. Required by code on irrigation, fire suppression, and many commercial connections.