Water is a unique natural chemical compound on which depends life. His significance is multiple and it can be observed with many aspects. Water is everywhere and in all of things: she is at the base of nature, modificator of relief, creator of scenery, the criterion of economic development and many more. Importance of water throughout history is more noticeable on islands. Since islands are by definition part of land smaller then continent but larger than rocks surrounded on all sides by water in this case by sea. Islands because of their isolation have to pay greater attention on the supplyment of water throughout history and it never lost on it’s important. Island Pag is supplying drinkable water through undersea pipes under the Velebit’s channel with one pipe made of steel and other made from PHD pipes. From cove Žigljen main pipe line is spreading toward town Novalja and from that town it is spreading throughout island Pag toward settlement Dinjiška on south part of island Pag. From that main pipe line secondary pipe lines are branching off towards places and settlements like: Kustići, Vidalići, Zubovići, Metajna, Dabovi stani, Tovarnele, Lun, Geger, Stara Novalja, Novalja, Gajac, Kolan, Mandre, Šimuni, Pag, Košljun, Gorica, Vrčići, Povljana, Dinjiška, Miškovići, Vlašići and other settlements on island Pag which are supplyed by water by island's water supply network. Inside island’s water supply network there are hydrotechnical water supply buildings like: breaking chambers, water tanks, pump stations and water extraction pumping station next to the accumulation lake. On island Pag there are mostly prevalent gravitational water supply systems with exemptions of places with pump water supply systems and combined water supply systems (like next to the settlement Kolan and next to the water extraction pumping station next to the accumulation lake “Velo blato”). On the island Pag there is always space for improvement Water supply system and in the future there will be some improvements.