The aim of the course is to cover a wide range of issues related to water resources and water quality. These include environmental importance, management, chemistry, quality, uses of natural water resources and seawater utilization. Contents: 1. Distribution, uses and quality of water. Current situation regarding water at international and national level. National and European legislation. Water Resources (conventional - non-conventional). Climate change and impacts on water resources. 2. Aquatic Chemistry: Natural aquatic systems-water composition - aqueous phase chemicals. Main pH variables, p. Acid-base effects (pC-pH diagrams). 3. Drinking (urban) water (Quality-management) Gray water (Quality-management) Irrigation water (Quality-management). 4. Reuse of treated waste, 5. Desalination of brackish and sea water (thermal, membranes, electrodialysis), 6. Water & Energy. Water footprint and Virtual water concept. Blue Growth.