In the settlement of Korisos there is no modern sewage system of waste but only pipelines (subways) that have been constructed in sections at various times and function as pantorheics. The project concerns the construction of a modern sewerage system, which will collect and lead the sewage from the settlement to the wastewater treatment plants of Kastoria. The pumping station and the external ducts have been completed under previous contraction. The implementation of the project is absolutely necessary in order to ensure public health and improve the living conditions of the residents of the settlement and the wider area.