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A managed system consisting of collection sewers and a single treatment plant used to collect and treat wastewater from an entire service area. Traditionally, such a system has been called a publicly owned treatment works (POTW).

A wastewater collection and treatment system under some form of common ownership that collects wastewater from two or more dwellings or buildings and conveys it to a treatment and dispersal system located on a suitable site near the dwellings or buildings.

Wastewater drained from sinks, tubs, showers, dishwashers, clothes washers, and other non-toilet sources.

An onsite method of partially treating and disposing of sanitary wastewater having the capacity to serve 20 or more persons per day subject to EPA's Underground Injection Control regulations.

System using technologies or combinations of technologies that are used where conventional septic systems cannot meet established performance or prescriptive requirements because of limiting site conditions. Also referred to as alternative septic systems.

A buried, watertight tank designed and constructed to receive and partially treat raw wastewater. The tank separates and retains settleable and floatable solids suspended in the wastewater and discharges the settled wastewater for further treatment and dispersal to the environment.