The 2021 Edition of the Uniform Plumbing Code (UPC®) represents the most advanced standards and practices in the plumbing industry. As the seventh edition developed through the ANSI Consensus process, it is officially recognized as an American National Standard by the American National Standards Institute (ANSI).
This edition is the result of extensive collaboration across all sectors of the built environment, including consumers, regulatory authorities, installers and maintenance professionals, labor groups, manufacturers, research and testing laboratories, industry specialists, and end users.
The UPC is developed with a clear purpose: to ensure safe, sanitary, and reliable plumbing systems for consumers while also supporting innovation and emerging technologies within the industry.
Key Updates in the 2021 UPC Edition
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New Appendix N addressing the impact of water temperature on scalding risks and the potential for Legionella growth
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Updated requirements for backflow prevention devices, assemblies, and methods
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New provisions for temperature-limiting devices to enhance safety
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Expanded guard and railing requirements for appliances installed on roofs and elevated platforms
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Revised rules for temperature and pressure relief (TPR) valve discharge piping
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New regulations for leak detection devices
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Updated provisions for potable water pumps
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New standards for drain, waste, and vent (DWV) pipes and fittings
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Enhanced requirements for DWV cleanouts
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Expanded and revised circuit venting provisions
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Updated fuel gas installation requirements
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Reorganized and improved medical gas system provisions for greater clarity and usability
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