The project concerns the integrated wastewater management system in the geographical area of the Municipality of Marathon and will provide a definitive solution to the sewerage problem of the area for several decades The Wastewater Treatment Center KEL Marathon with a capacity of 51400 inhabitants in its initial phase forecast 2030 and up to 110000 in the final phase 2060 will serve the agglomerations of Agios Panteleimonas Marathon Zouberi part of the agglomeration of Nea Makri Agia Marina part of the agglomeration Neos Voutzas part of the agglomeration It will operate with technology that will allow the use of the treated effluent for unlimited irrigation The operation of the project will contribute decisively to the environmental upgrading of the area and its further tourist development