This cover image illustrates the concept of closing the urban water loop. In order to supply high quality drinking water in a technically efficient and environmentally sustainable manner, a one-step reverse osmosis model is proposed that consists of riverbank filtration and reverse osmosis treatment. The model combines nature based free pretreatment with an advanced engineered purification technology. Domestic and industrial wastewater are collected and further treated to meet the requirements for discharging into the surface water or recharging into aquifers, after which the water can be abstracted for drinking water production. In the end, a closed urban water loop will be achieved in which water is recirculated from and to its source to fight increasing water scarcity. Continuous exploration into and focus on combinations of nature based processes and engineered systems are encouraged in order to produce, reclaim, and reuse water resources in a more sustainable and renewable way.