What is a common source of greywater?

Greywater refers to the relatively clean wastewater generated from domestic activities such as washing dishes, laundry, and bathing. This type of water excludes sewage, which is classified as blackwater. Washing dishes is a common source of greywater because it produces a significant volume of used water that contains food particles, detergents, and oils, yet is not hazardous like the water from toilets. This water can be reused for various purposes, such as irrigation or toilet flushing, making it an important resource in water conservation practices.

Other sources like toilet flushing contribute to blackwater because they include human waste and are not suitable for reuse unless treated, while stormwater runoff typically pertains to rainwater that washes off surfaces and can carry pollutants. Industrial wastewater is often more contaminated and usually requires extensive treatment before any potential reuse. Thus, among the options listed, washing dishes stands out as a clear and consistent source of greywater.