Which of the following is required for all projects under Indoor Water Use Reduction?

The requirement for all projects under Indoor Water Use Reduction is aligned with the Water Efficiency (WE) Prerequisite. This prerequisite sets the foundation for projects to reduce indoor water use by establishing minimum benchmarks that must be met, thereby promoting water efficiency from the outset of a project.

By addressing the Water Efficiency Prerequisite, projects are encouraged to implement strategies that lead to a significant decrease in indoor water consumption through efficient plumbing fixtures and fittings. This drives a broader goal within the LEED framework of sustainable water management and conservation practices.

The other options relate to different aspects of the LEED certification process. Compliance with the Energy Policy Act of 2005, for example, is specific to energy efficiencies rather than directly addressing water usage. Similarly, the SSc Credit eligibility and MR Credit compliance pertain to other credit categories that focus on site sustainability and materials and resources, rather than the specific requirements necessary for indoor water use reduction. Therefore, focusing on the WE Prerequisite is essential for all projects to meet before addressing further credits or compliance frameworks.