Which of the following is not typically categorized as sewage?

Stormwater runoff is the correct answer because it refers to water that originates from precipitation such as rain or melting snow and flows over surfaces like roads, lawns, and roofs. Unlike sewage, which is primarily human-generated waste (black water refers to wastewater from toilets, grey water is from sinks and showers, and comminuted waste can refer to wastewater that has been mechanically processed to separate solids), stormwater runoff is not contaminated by human waste and is generally treated differently. It is collected and managed separately as part of stormwater management systems to mitigate flooding and protect water quality in nearby bodies of water.

In contrast, black water and grey water both contain waste products that require treatment before they can be safely discharged or reused. Comminuted waste, while a processed form of sewage, is still classified as such because it contains similar pollutants that require management.