2021 Uniform Plumbing Code

The 2021 edition of the Uniform Plumbing Code (UPC®) represents the most current approaches in the plumbing field. It is the seventh edition developed under the ANSI Consensus process and is designated as an American National Standards by the American National Standards Institute (ANSI). Contributions to the content of this code were made by every segment of the built industry, including such diverse interests as consumers, enforcing authorities, installers/maintainers, labor, manufacturers, research/standards/testing laboratories, special experts and users.

The UPC is designed to provide consumers with safe and sanitary plumbing systems while, at the same time, allowing latitude for innovation and new technologies.

Key changes to the 2021 UPC include: 

• New Appendix N Impact of Water Temperature on the Potential for Scalding and Legionella Growth
  New provisions for backflow prevention devices, assemblies, and methods
  New provision of temperature limiting devices
  New guard and rail requirements for appliances on roofs and platforms
  New requirements for the discharge of temperature and pressure relief valve piping
  New provision on leak detection devices Provisions for potable water pumps
  New standards for drain, waste, and vent pipe and fittings
  New provisions for drain waste and vent cleanouts
  Circuit vent provisions have been updated and expanded
  Updated to fuel gas provisions
  Updated medical gas provisions including reordering of categories for ease of use

About IAPMO

International Association of Plumbing and Mechanical Officials (IAPMO) was founded in 1926, IAPMO aims to advance improved sanitation methods and promote the welfare of builders, owners, and craftsmen. The organization focuses on developing uniform codes and standards to protect public health and safety in plumbing and mechanical systems. IAPMO’s mission includes fostering harmony among stakeholders and ensuring the effective application of plumbing regulations.

Other Works:

• 2015 Uniform Plumbing Code
• 2018 Uniform Plumbing Code
• 2024 Uniform Plumbing Code