What is typically not included in the definition of septage?

The definition of septage refers specifically to the mixture of liquid and solid waste that is collected from septic tanks, cesspools, and similar systems. It typically includes the effluent and solids that accumulate in these systems, which is predominantly the wastewater from individual home septic systems and waste from cesspools.

Grease trap waste, on the other hand, originates from commercial operations like restaurants where fats, oils, and grease are separated from wastewater before it enters the sewage system. This type of waste is managed differently and is not considered septage since it does not come from septic systems designed for domestic sewage treatment. Thus, grease trap waste is distinctly categorized apart from the typical composition of septage, making it an incorrect answer in this context.