Which substances are typically NOT found in sanitary sewage?

Rainwater runoff is typically not considered a component of sanitary sewage because sanitary sewage primarily consists of wastewater from domestic and industrial sources that include human waste, food waste, detergents, and other household chemicals. Sanitary sewage is characterized by its origins in residences and businesses, where it is collected for treatment.

Rainwater runoff, on the other hand, is stormwater that collects pollutants as it flows over surfaces such as roads and parking lots, but this water is separate from sanitary sewage systems. In many areas, rainwater runoff is often channeled through separate stormwater management systems designed to handle rain events, preventing contamination of the sewage treatment processes.

Domestic sewage, industrial waste, and household waste, in contrast, are all integral to sanitary sewage systems, as they originate from the activities within homes and businesses that require treatment before being released into the environment. This differentiates them from rainwater runoff, which has a different composition and management approach.