What type of wastewater is referred to as "gray waters"?

The term "gray waters" specifically refers to wastewater that is generated from household activities such as washing dishes, bathing, and laundering clothes. This type of water is distinct from "black water," which includes wastewater from toilets and contains human waste. Gray water is typically less contaminated than black water and can sometimes be recycled for irrigation or other uses after proper treatment.

In contrast, other options are not categorized as gray water. Water from toilets would be classified as black water, while stormwater runoff refers to rainwater that flows over surfaces and can carry pollutants. The option regarding water used for dishwashing only is too narrow, as gray water encompasses wastewater from multiple activities, not just dishwashing. Thus, the choice highlighting wastewater generated from sinks, showers, and washing machines accurately reflects the broader definition and characteristics of gray waters.