Irrigation System
CSI Division 32, Exterior Improvements
The piping, valves, controllers, and sprinkler or drip emitter heads installed to automatically water a site's landscaping, designed around the specific plant material's water needs and typically zoned so different areas, turf, planting beds, trees, can be watered on different schedules.
Why it matters
An irrigation system installed without coordinating its water source and backflow prevention with the site's domestic water design can create a cross-connection hazard, letting untreated irrigation water potentially flow back into the building's potable water supply, which is exactly why code requires a dedicated backflow preventer on the irrigation line.
On a real project
A landscaping contractor installs a dedicated backflow preventer on the irrigation system's connection to the domestic water supply, isolating the irrigation piping from the building's potable water in case of a pressure drop that could otherwise pull water backward.
Who this matters most to
A specialty irrigation contractor installs and zones the system. A Plumber typically installs the required backflow preventer where the irrigation system connects to the domestic water supply.
Where this goes wrong
A landscaping contractor connects a new irrigation system directly to the domestic water supply without installing the required backflow preventer, unaware it fell outside their scope and assuming the plumber had already handled it. A code inspector catches the missing device during a final inspection, and the connection has to be redone before the project can close out.
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