special experts and users. The 2012 Uniform Plumbing Code is supported by the American Society of Sanitary Engineering (ASSE), the Mechanical Contractors Association of America (MCAA), the Plumbing-Heating-Cooling Contractors National Association (PHCC-NA), the United Association (UA) and the World Plumbing Council (WPC). These associations support IAPMO’s open consensus process being used to develop IAPMO’s codes and standards. 2018 Edition The sixth edition to be designated as an American National Standard, the latest UPC includes the following key changes: New alternate water sources for nonpotable applications and nonpotable rainwater catchment systems (Chapters 16, 17) based upon IAPMO’s Green Plumbing and Mechanical Code Supplement New Appendix L (sustainable practices) New minimum plumbing facilities table (Chapter 4) Water supply and drainage joint connection requirements (Chapters 6, 7) Content Chapter 1 - Administration Chapter 2 - Definitions Chapter 3 - General Regulations Chapter 4 - Plumbing Fixtures and Fixture Fittings Chapter 5 - Water Heaters Chapter 6 - Water Supply and Distribution Chapter 7 - Sanitary Drainage Chapter 8 - Indirect Wastes Chapter 9 - Vents Chapter 10 - Traps and Interceptors Chapter 11 - Storm Drainage Chapter 12 - Fuel Piping Chapter 13 - Health Care Facilities and Medical Gas and Vacuum Systems Chapter 14 - Firestop Protection Chapter 15 - Alternate Water Sources for Nonpotable Applications Chapter 16 - Nonpotable Rainwater Catchment (Rainwater Harvesting) Systems Chapter 17 - Referenced Standards Appendix A - Recommended Rules for Sizing the Water supply System Appendix B - Explanatory Notes on Combination Waste and Vent Systems Appendix C - Alternate Plumbing Systems Appendix D - Sizing Storm Water Drainage Systems Appendix E - Manufactured/Mobile Home Parks and Recreational Vehicle Parks Appendix F - Firefighter Breathing Air Replenishment Systems Appendix G - Sizing of Venting Systems Appendix H - Private Sewage Disposal Systems Appendix I - Installation Standard Appendix J - Combination of Indoor and Outdoor Combustion and Ventilation Opening Design Appendix K - Potable Rainwater Catchment Systems Appendix L - Sustainable Practices Appendix M - Peak Water Demand Calculator See also IAPMO IAPMO Standards IAPMO R&T Uniform Codes Uniform Mechanical Code Uniform Solar Energy and Hydronics Code Uniform Swimming Pool, Spa and Hot Tub Code Building officials Building inspection References External links IAPMO Website IAPMO Codes Website Uniform Mechanical Code Website Uniform Plumbing CodeWebsite Uniform Solar, Hydronics & Geothermal Code Website Uniform Swimming Pool, Spa & Hot Tub Code Website Safety codes Plumbing