In the agglomerations of Pentavrysos and Eastern Pentavrysos, it is proposed to construct an internal network and an external sewage transport network for the agglomerations of Eastern Pentavrysos and Perdicka that will lead the sewage of the agglomerations through a proposed external network to the biological treatment of Ptolemaida, which is located near the city of Ptolemaida, in order to protect the water recipients.