WWM-2022, Thailand highlighted the advancements in emerging technologies and innovations in various thematic areas, including Water conservation and treatment, waste management and circular economy, health and well-being, agriculture, and Climate Impacts in connection with Water and Waste Management. The conference provided a platform to integrate ideas and solutions from senior government functionaries and scientific experts working in all areas of water and waste management. It facilitated knowledge exchange through networking of industries and civil society representatives, non-governmental organizations, research institutes and academic institutions and universities around the world. IT also presented a virtual platform for showcasing novel and emerging business opportunities in water and waste management sectors. Thus, the 4th WWM served as a global platform to unite policy makers, researchers, industrialists, entrepreneurs, scholars, and legal experts from various parts of the globe.