What is the term for the combination of sanitary sewerage and storm water?

The term that refers to the combination of sanitary sewerage and storm water is commonly known as combined sewage. In urban areas, many older systems were designed to handle both types of wastewater in a single pipe system, resulting in combined sewer systems. These systems can lead to various challenges, especially during heavy rainfall when they can overflow. Understanding this term is crucial because it highlights the potential issues related to water management and environmental protection in municipal setups, especially in the context of pollution and the burden on treatment facilities.

Other options, such as sewer line, septage line, and septic tank, refer to specific components of wastewater management or treatment systems but do not encompass the idea of combining sanitary and storm water flows.