A changing climate is a global stressor on water supply with substantial uncertainty. Compounded with other stressors (e.g., urbanization) and extreme events (e.g., natural disasters), it can produce profound impacts on water availability and quality across time and scales. Here two questions ought to be answered. How does a changing climate threaten water supply in terms of water quantity and quality? Meanwhile, how can environmental engineers and scientists mitigate the climate impacts to safeguard water security/sustainability at regional and global scale? This will provide a scientific forum for the community of AEESP to discuss the pressing challenges, explore innovative solutions, and identify key research directions. Activities: the workshop sessions will be grouped into two areas: 1) impacts and challenges of climate crisis on water availability and quality on regional and global scales; and 2) solutions to climate impacts for water security and sustainability. Both areas will include panel discussions, keynote presentations, breakout discussions, and brainstorming sessions to retrospect the lessons learned, share the state-of-the-art knowledge, and discuss different strategies to solutions. Organizers: Yang Deng, Montclair State University; Dionysios (Dion) Dionysiou, University of Cincinnati; Virender K. Sharma, Texas A&M