The action concerns the upgrading of the water supply infrastructure of the D.E.Y.A. Skopelos and in particular the replacement of central depressive pipelines in the three (3) municipal districts of the Municipality of Skopelos. The replacement is deemed necessary because of the age and deterioration of the pipelines resulting in increased water losses. In addition, the inappropriate construction material of the pipelines and their route through properties and off-road public use are highlighted. In particular, 1.650 m of cross section pipeline Φ200 in Skopelos, 1.700 m cross section pipeline Φ125 & Φ110 in Glossa and 705 m cross-section pipeline Φ160 in Klima. In addition, two (2) small parts of the distribution network are replaced in Skopelos country with a total length of 465 m of a cross-section pipeline Φ125 and a (1) 290 m section of the central intersection pipeline Φ 200 in N. Klima. Finally, the hydraulic installation of the central water supply tank of N. Klima is completely replaced.