How does the UPC define "graywater"?

The definition of "graywater" in the UPC encompasses water that is used in household settings and comes from various sources excluding toilets. Typically, this refers to used water from sinks, showers, bathtubs, and washing machines, which can be recycled for uses such as irrigation or flushing toilets, provided it meets specific guidelines.

Graywater does not include water from toilets, as that is classified as blackwater due to its higher risk of contamination. Untreated rainwater is a separate category and does not fall under the definition of graywater. Similarly, pure water from treatment plants does not qualify, as it is clean water, not used water. Understanding this distinction helps clarify the importance of graywater recycling and its role in sustainable water management practices.