What is a key aspect of using graywater systems in LEED projects?

The use of graywater systems in LEED projects is primarily aimed at water conservation, especially the conservation of potable water. Graywater refers to relatively clean wastewater from baths, sinks, washing machines, and other kitchen appliances. By recycling this water for non-potable uses such as irrigation or toilet flushing, projects can significantly reduce the demand for treated drinking water. This practice is aligned with LEED's commitment to promoting sustainable water management and enhancing water efficiency within buildings.

The other options do not capture the primary intent or practical application of graywater systems. While graywater systems may support outdoor irrigation, they are not limited to that use. They are not a mandatory requirement for all residential buildings, nor do they always require extensive treatment before repurposing, as some graywater can be used with minimal processing, depending on local regulations. Focus on conserving potable water stands out as the key aspect that underscores the sustainability goals of using graywater systems in LEED projects.