For the last two months all the talk at meetings and conferences has been the 2021 codes. Although 2021 seems far off in the future, it is the next time anyone will be able to change the requirements in the model plumbing and mechanical codes.
In the midst of all this discussion, it was somewhat shocking IAPMO announced it is changing its deadline for submitting code changes to the 2021 Uniform Plumbing Code and Uniform Mechanical Code. The new deadline is March 16, 2018. That is six months away.