In LEED, what do "graywater" and "blackwater" refer to?

"Graywater" and "blackwater" are terms used to categorize different types of wastewater based on their source and level of contamination. Graywater refers to relatively clean wastewater that comes from sources such as sinks, showers, and laundry facilities. It is typically free from pathogens and can often be reused for non-potable applications, such as irrigation or toilet flushing.

Blackwater, on the other hand, includes wastewater that comes from toilets and potentially contains pathogens, making it more contaminated and requiring special handling and treatment. This distinction is crucial for water management practices, especially in sustainable building operations where minimizing water use and promoting water reuse are key objectives.

Understanding this classification aligns with LEED’s goals for Water Efficiency, as it encourages the responsible use and reuse of water resources. By effectively managing both graywater and blackwater, buildings can reduce their overall water consumption and environmental impact.