The project concerns the construction of a natural treatment system for urban waste and sewerage in the settlement of Nestorio in the Municipality of Kastoria. The project includes: A) Integration of the internal sewerage networks of the settlement and separating them from the storms in the sections where the network is pantorheic, as well as a new sewerage pipeline to wastewater treatment plants, with the ultimate aim of separating the existing sewage and rainwater system of the settlement. B) Construction of the sewage treatment plant (EEL) of the settlement of Nestoriou. The unit is located at the location “Sphageia” of the Municipality of Nestorio on a tributary area of the river Aliakmonas, located east of the settlement Nestorio. This is a natural wastewater treatment system. The natural object of the project includes the electrification of the natural sewage treatment system of Nestoriou settlement.