This project concerns the construction of the Installation of Wastewater Treatment of Vathylakkos, Messiani and Roditi Municipality of Servia-Velvedos, the construction of the external sewerage network of the municipal districts (D.D.) Vathylakkos, Messiani and Roditis, which includes the settlement of Kouvouklia and a connection to Public Service Networks. The E.L.L. will be tailored to the environment of the area in which its installation is planned and will be designed in a way that does not cause noise, odour and hazards.The operation of the unit seeks to improve the characteristics of urban waste water of the aforementioned settlements in such a way that after treatment the waste water meets the approved environmental conditions and the corresponding conditions of the Health Provisions and related regional decisions which have taken into account the existing European legislation. Also included in the project is the construction of the external sewerage network of D.D. Vathylakkos, Messiani and Roditis (network, technical works, pump room) as well as the connections with the public utility networks (HEDNO, OTE, HYDRUSIS).