According to Green Infrastructure and Buildings Prerequisite.

The Green Infrastructure and Buildings Prerequisite for Indoor Water Use Reduction requires that the indoor water usage of new buildings or buildings undergoing major renovations must average at least 20% less than in baseline buildings. This prerequisite is aimed at promoting water conservation through the use of efficient plumbing fixtures, appliances, and systems, contributing to the overall sustainability of the project by reducing water demand and minimizing the strain on local water resources.