The "Smart City" approach, which aims to increase environmental sustainability, has become important especially in developed countries in recent years. For this purpose, "Smart City" approach is useful for ensuring environmental sustainability by protecting water resources. Therefore, Smart Cities can be defined as cities with an advanced urban information system in areas such as water, waste, infrastructure, health, safety, environment, energy and transportation. In this study, as part of a European Union Project, where Istanbul University participates as a partner, supported under EU Horizon 2020, Istanbul as a Case Study is presented. Blueprint and Amberprint concepts are developed within the scope of the project named “Blueprints for Smart Cities: Developing the methodology for a coordinated approach to the integration of the water and waste sectors within the EIP Smart Cities and Communities (BlueSCities)”. Then, pilot cities were selected and Blueprint and Amberprint scores for each city were calculated. Moreover, the solutions applied in each city are investigated. Practices in cities that are in good condition, which have high footprint values, act as an example for other cities. In this paper, Blueprint and Amberprint concepts are explained and the results obtained for Istanbul are presented.