The 2006 International Plumbing Code presents a framework of minimum requirements for plumbing systems, combining prescriptive rules with provisions related to performance. Its introduction emphasizes protecting public health and safety while allowing new materials and designs without unnecessarily increasing construction costs. The edition incorporates changes approved through the code development process through 2005. The opening administrative chapter explains the code’s scope, its application to existing installations, and responsibilities for maintaining safe and sanitary systems. It addresses alterations, repairs, changes in occupancy, historic buildings, and relocated structures. It also distinguishes systems governed by this code from fuel gas installations and certain residential buildings covered by other codes. The contents outline technical chapters on fixtures, faucets, water heaters, water supply, sanitary drainage, indirect and special wastes, vents, traps, interceptors, and storm drainage. More specialized topics include medical gases, oxygen systems, potable water protection, disinfection, and engineered vent arrangements. Appendices cover permit fees, rainfall data, gray water recycling, design temperatures, water pipe sizing, structural safety, and vacuum drainage. A sample adoption ordinance shows how a jurisdiction can incorporate the code and supply local information. Explanations of committee letter designations and marginal markings help readers identify responsibility for particular provisions and changes from the 2003 edition. Together, these features make the volume a structured reference for plumbing designers, installers, inspectors, and officials examining the requirements of this specific edition.