Which of the following is not typically categorized as sewage?

Stormwater runoff is not typically categorized as sewage because it is the water that flows over impervious surfaces like roads and parking lots during precipitation events, rather than being generated from household wastewater activities. Sewage generally refers to water that has been used in washing, cooking, or sanitation, containing contaminants which need treatment.

Black water and grey water are both types of sewage; black water specifically refers to wastewater from toilets containing human waste, while grey water comes from baths, sinks, and washing machines, which may have lesser contaminants. Comminuted waste, often found in a sewage context, refers to waste that has been ground up or broken down for easier processing in sewage systems.

In summary, stormwater runoff does not come from human or domestic activities but rather is a natural occurrence that collects rainfall and surface runoff, distinguishing it from typical sewage categories.