The National Standard Plumbing Code (NSPC) is a set of guidelines that establishes minimum requirements for plumbing systems in the United States. It aims to ensure safe and efficient plumbing practices, covering aspects such as installation, maintenance, and inspection of plumbing systems. The code is regularly updated to reflect advancements in technology and changes in public health standards. Developed by the National Association of Plumbing-Heating-Cooling Contractors (NAPHCC), the NSPC serves as a reference for plumbers, contractors, and building officials. By adhering to these standards, professionals can help protect public health and safety while promoting sustainable plumbing practices across various types of buildings.