Septic tank
A septic tank is an underground chamber made of concrete, fiberglass or plastic through which domestic wastewater (sewage) flows for basic treatment. Settling and anaerobic processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). Septic tank systems are a type of simple onsite sewage facility (OSSF). They can be used in areas that are not connected to a sewerage system, such as rural areas. The treated liquid effluent is commonly disposed in a septic drain field which provides further treatment. However, groundwater pollution may occur and can be a problem.
Voutsaras, Ioannina
An architectural pattern typical for the village consists of a two-floor house: the top floor is fully walled and serves as the residential area for one or more families, whereas the ground floor is used for housing livestock (goats, sheep, swine). Less wealthy families, who cannot afford a two-floor house share living quarters with the livestock. There are plans to construct centralised plumbing facilities for the disposal of sewage in the near future, so as to replace the current practice of using septic tanks which drain in the nearby river Thyamis.