The classification of gray water typically includes flows from sinks, showers, and laundry, which can be reused for irrigation or other non-potable purposes. Food prep sink water, however, is usually classified as "black water" or "contaminated water" due to its higher levels of biological contaminants, including food particles and organic waste. This classification restricts its reuse because it poses a greater risk to public health and the environment.
In contrast, the other types of water mentioned, such as hand wash sink water, dishwashing water, and pretreated laundry water, are considered gray water because they typically contain fewer contaminants and are more suitable for certain types of reuse.
Understanding this classification helps in proper septic system management and ensures compliance with local regulations regarding wastewater disposal and recycling.