Onsite sewage facility, also known as a septic system, is a common term used to describe a wastewater treatment facility located on the premises of a home or commercial building. However, there are several synonyms used to describe these systems. Some of these synonyms include a septic tank system, an individual wastewater system, an independent sewage disposal system, and a private sewage treatment plant. These terms are all used interchangeably to refer to the same type of system. Regardless of the term used, onsite sewage facilities are crucial in rural areas where access to centralized wastewater treatment plants is limited. They ensure that wastewater is treated and disposed of safely and hygienically, protecting public health and the environment.