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Comprehensive and Detailed Explanation:

IPC Chapter 1 (Scope and Administration) requires permits for most plumbing work including new installations, alterations, repairs, and replacements that affect the system. In Westchester County, the Department of Consumer Protection issues permits and conducts inspections. Journey-level plumbers must ensure work is permitted and performed under a licensed master plumber. This administrative requirement ensures code compliance, safety, and proper documentation. The code official reviews plans, conducts rough-in and final inspections, and approves the work. Understanding definitions such as "plumbing system" and "alteration" helps determine when permits are needed. Failure to obtain permits can result in stop-work orders, fines, or removal of unpermitted work. Study guides for the journey-level exam stress the importance of working within the AHJ framework, including approvedmaterials and methods. This knowledge protects public health by ensuring systems are installed correctly to prevent contamination, leaks, and hazards. Always verify specific Westchester requirements and the current adopted IPC edition, as local amendments may exist. Proper permit processes support professional practice and successful project completion.