The paper "Building a Smart Water City: IoT Smart Water Technologies, Applications, and Future Directions" by Nwakego Joy Okoli and Boniface Kabaso reviews the current state of IoT-based smart water applications and their potential for sustainable water management. The authors highlight the increasing global water demand due to economic development, climate change, and population growth, emphasizing the need for efficient water resource management. They discuss how IoT and Information and Communication Technologies (ICT) can help conserve water resources and improve the performance and efficiency of urban facilities in smart cities. The review covers various technologies used in smart water applications, including microcontrollers, embedded programming languages, sensors, communication modules, and protocols. Notably, the study finds that none of the publications used 5G mobile networks as a communication module for smart water application development. The integration of 3D printing and solar energy into IoT-based smart water applications is highlighted as revolutionary, offering increased sustainability and reducing reliance on traditional energy sources. The paper also presents findings on the geographical distribution of research, with most studies conducted in India, and discusses the affiliations of the authors, primarily from academia and private organizations. The authors recommend future research directions, including the use of 5G mobile networks and further integration of 3D printing and solar energy to enhance the effectiveness and sustainability of smart water applications.The paper "Building a Smart Water City: IoT Smart Water Technologies, Applications, and Future Directions" by Nwakego Joy Okoli and Boniface Kabaso reviews the current state of IoT-based smart water applications and their potential for sustainable water management. The authors highlight the increasing global water demand due to economic development, climate change, and population growth, emphasizing the need for efficient water resource management. They discuss how IoT and Information and Communication Technologies (ICT) can help conserve water resources and improve the performance and efficiency of urban facilities in smart cities. The review covers various technologies used in smart water applications, including microcontrollers, embedded programming languages, sensors, communication modules, and protocols. Notably, the study finds that none of the publications used 5G mobile networks as a communication module for smart water application development. The integration of 3D printing and solar energy into IoT-based smart water applications is highlighted as revolutionary, offering increased sustainability and reducing reliance on traditional energy sources. The paper also presents findings on the geographical distribution of research, with most studies conducted in India, and discusses the affiliations of the authors, primarily from academia and private organizations. The authors recommend future research directions, including the use of 5G mobile networks and further integration of 3D printing and solar energy to enhance the effectiveness and sustainability of smart water applications.