The project concerns the improvement of the existing Wastewater Treatment Plant (EEL) of the Municipality of Patmos, where the urban waste water of the settlement of Skala, part of Chora (approximately 35 %) and Kampos (approximately 25 %) will be driven, which are connected to the main pipeline that ends in the EEL. The SPD will be with a capacity of 6 063 tonnes today, 7.398 % for 20 years and 9,027 tonnes over the 40 years. In addition to the above, the project includes sub-projects of autoregulation of archaeology and extension of networks of Public Benefit Organisations (OO).