What code governs irrigation installation in most areas?

The local plumbing code is the governing set of regulations for irrigation installation in most areas because it is specifically tailored to address the unique needs and considerations of plumbing and irrigation within a community. Local codes are designed to reflect regional practices, environmental concerns, and public health standards. They provide the necessary guidelines that ensure installations are done safely and efficiently, often integrating specific requirements for backflow prevention, water conservation, and system maintenance.

While the National Plumbing Code and the International Building Code provide general frameworks for plumbing and building standards respectively, they may not account for local conditions that influence irrigation practices. The Environmental Protection Code, although relevant to environmental regulations, does not specifically focus on the technical and practical aspects of irrigation installation. Therefore, the local plumbing code is the most appropriate and applicable set of regulations governing irrigation systems in most areas.