Which type of system includes domestic wastewater holding tanks unrelated to onsite treatment?

The answer identifies "Other sewage holding systems" as the type of system that includes domestic wastewater holding tanks unrelated to onsite treatment. This distinction is important because these holding tanks serve as temporary storage for wastewater but are designed specifically for holding sewage without any treatment processes taking place. These systems are often used in scenarios where onsite treatment is not feasible or practical, such as in remote areas or where immediate treatment is not available.

Other types of systems mentioned serve different purposes. Commercial wastewater systems typically involve more complex treatment processes aimed at handling wastewater from businesses. Community wastewater systems refer to more extensive infrastructure that treats and manages wastewater for a larger group or community, emphasizing treatment rather than mere holding. Individual residential systems focus on treatment processes tailored for single residences, typically involving septic systems. Hence, each of these alternatives includes some level of treatment or active management, which sets them apart from the category of systems focused solely on holding.