Add the following language to International Tips under the Further Explanation section:

"Pressure testing standards
Supply water pressure and flow rate pressure testing standards vary throughout the world. For consistency, it is recommended that all projects use the flow rates reported by the manufacturer at 60 psi (415 kPa) for lavatories and kitchen sinks and 80 psi (550 kPa) for showerheads, or obtain the rated flow rates from an independent testing company.

If the manufacturer or testing company cannot provide the rated flow rate, project teams may use on-site tests to report the most accurate volume of water use. The fixture performance baseline would be developed by testing a baseline fixture onsite in the context of the building water pressure. The design case would use the actual measured flow rate of the fixtures installed in the project. The underlying assumptions used for calculating projected water use savings must remain consistent between the baseline and design cases."