IAPMO Publishes 2027 Editions of UPC, UMC

IAPMO has published the 2027 editions of the Uniform Plumbing Code and Uniform Mechanical Code in both hardcopy and electronic versions, completing a three-year consensus development cycle accredited by the American National Standards Institute.

The 2027 UPC and UMC Illustrated Training Manuals and Guide to Important Code Changes are also available, offering an additional educational resource designed to support understanding and application of the codes through clear visual interpretation and practical instruction. Documents may be purchased through the IAPMO bookstore at https://iapmostore.org/.

Significant changes to the UPC include:

• New provisions for adult changing stations
• New provisions for laminar flow faucets in healthcare facilities
• New provisions for sizing of dual-purpose and instantaneous (tankless) water heaters
• New provisions for flow-through expansion tanks in water supply and distribution systems
• New provisions for vacuum testing of drainage and vent systems
• Updates to Appendix N addressing building water management planning and monitoring to reduce Legionella and scalding risks in plumbing systems
• New Appendix Q providing requirements for the safe operation, closure and reopening of building water systems
• New Appendix U providing recommended practice for hydrogen fuel gas piping systems
• New Appendix V providing minimum requirements for onsite wastewater treatment systems for direct potable water reuse.

Significant changes to the UMC include:

• Updated certification pathways for qualified personnel performing ventilation system testing, adjusting and balancing and duct leakage testing
• New provisions for exhaust systems conveying radioactive materials
• New prescriptive requirements for grease duct leakage testing
• Updated provisions for refrigeration systems including releasable refrigerant charge limits (EDVC framework), machinery rooms and refrigerant piping/shaft requirements
• New provisions for masonry heaters, including dedicated compliance pathways for listed and site-built systems
• New provisions for district energy systems, expanding beyond Ambient Temperature Loop systems
• New Appendix H providing minimum requirements to address Legionella growth in mechanical systems
• New Appendix K with recommended configurations for maintaining quality of heat transfer fluids in closed loop hydronic systems
• New Appendix M providing recommended practice for hydrogen fuel gas piping systems.