What type of system receives sewage other than public systems?

The choice of a subsurface sewage disposal system is correct because it specifically refers to a system designed to treat and dispose of sewage on-site, usually at residential or commercial properties, rather than through public infrastructure. These systems are particularly important for households situated in areas that lack access to municipal sewage systems.

Subsurface sewage disposal involves the use of leach fields or drain fields, where wastewater is filtered through the soil, allowing natural processes to treat the sewage before it reaches the groundwater. This method is vital in remote or rural areas of Tennessee, where public sewage treatment facilities are not available, thus ensuring proper sanitation and environmental protection.

Other systems such as municipal sewage treatment facilities deal with sewage collected from a centralized network of pipes, which does not encompass individual or private disposal methods. An above-ground sewage system, while it may exist, is less common for regular sewage disposal due to regulations and space constraints. A combined sewage system typically refers to systems designed to handle both sewage and stormwater in urban areas, which again does not apply to the private context of sewage treatment on individual properties.