Water is one of our most important natural resources, and touches our lives in innumerable ways. There are many fascinating outstanding scientific questions involving water, and also challenges that call for more engineering solutions. These challenges include, for example, the widespread availability of clean water for personal use, agriculture, and industry, and the use of water in energy production. Water also impacts our lives greatly in the context of climate and atmospheric sciences, and biology, health and medicine. This workshop will bring together people in many disciplines (engineering, chemistry, biology, physics, atmospheric sciences, materials science, geological sciences, and environmental sciences) to tackle the above problems. A wide variety of processes (desalination, filtration, sensing, adsorption, red-ox reactions, aggregation and fouling, crystallization, and corrosion) will be discussed, as will a large range of materials (catalysts, polymer membranes, inorganic filters, reduced-dimensional nano-materials, surfactants and lipids, proteins and bio-inspired/bio-compatible materials). This workshop will also involve the basic science underlying these more applied processes and materials, including water in extreme conditions, ices (amorphous and crystalline), solutions/solvation/self-assembly, clathrates, confined and interfacial water, biomolecule hydration, and transport/nucleation/growth.