Reference Guide indicates WaterSense label requirements are mandatory in U.S.

Right now the program for the WaterSense label on toilet flushometers is still in draft stage. http://www.epa.gov/watersense/partners/fvtoilets_draft.html
http://www.epa.gov/watersense/docs/FVtoilets_coverletter508.pdf

It appears that currently no commercial toilets & flush valves have WaterSense. Does anyone know how this is handle on LEED4?