On Sept. 28, 2005, IAPMO and ICC announced the signing of a Memorandum of Understanding to jointly work towards the development of a single Plumbing Code and Mechanical Code. This historic agreement brings the two major code groups for plumbing and mechanical codes together.
Each organization will issue their 2006 edition of the Plumbing Code and Mechanical Code next year. They will then proceed and merge the codes. The goal in working together is to have a combined set of plumbing and mechanical codes by the next printing of the codes, which is 2009. Details on the process of combining the codes will be developed within the next few months.