Which of the following are sources of graywater?

Graywater is defined as the relatively clean wastewater from various sources within a building, excluding water from toilets, which is classified as blackwater. The sources contribute to graywater are typically those that do not involve contamination from fecal matter.

The correct choice includes showers and washing machines, both of which generate water that can often be reused for irrigation or other non-potable applications. Showers produce water that is primarily from human washing, while washing machines produce water used to clean clothes. This graywater can be collected and treated for reuse, making it an important resource in water efficiency practices.

In contrast, the other choices involve water sources that either contain higher levels of contaminants or are less effective for graywater reuse. For example, toilets and sinks can contain waste from gastrointestinal sources or foods, while dishwashers and bathtubs may have residual food particles or contaminants from bath products. Outdoor faucets and ice makers may not consistently or primarily produce graywater suitable for reuse as they often deal with clean water scenarios that do not align with graywater definitions. Thus, showers and washing machines are the most relevant sources of graywater listed.