for this project is gratefully acknowledged. Water Hackathon was led jointly by the World Bank Water Anchor, Water and Sanitation Program and ICT Sector Unit, with operational support from Second Muse, technology partners from the National Aeronautics and Space Administration, Open Development Technology Alliance, Random Hacks of Kindness, and dedicated local partner organizations in each hackathon event location. The report was prepared by Daniel Shemie, Max Hirn, Vivek Raman, Cecilia Paradi-Guilford, Elizabeth Sabet, Yehude Simon, Rosemary Rop and Edward Anderson. Ilana Cohen and Christian Kreutz provided valuable research. The authors are grateful for useful comments provided by Isabelle Huynh, Nagaraja Rao Harshadeep, Rajendra Singh, Randeep Sudan, Robbie Schingler, Francis Ghesquiere, Eric Gundersen, Noel Dickover and Johannes S. Kiess. A large number of World Bank colleagues contributed to making Water Hackathon a success. While these individuals are too numerous to mention, the authors would like to acknowledge the contributions made by Christopher Walsh, Kara Watkins, Katherine Maher, Ravikumar Joseph, Kimberly Lyon, Christopher Juan Costain, Deepak T. Bhatia, Ammini Menon, Vandana Mehra, Adrien Andre Pinelli, Nehal Hassan El Kouesny, Heba Yaken Aref Ahmed, Carlo M. Rossotto, Susanne Scheierling, Juan Chong Ortiz, Iris Marmanillo, Miguel Vargas-Ramirez, Glenn Pearce- Oroz, Lizmara Kirchner, Richard Murby, Samuel Mutono, Steven K. Shalita, Wambui G. Gichuri, Toni Sittoni, Alex McPhail, Karolina Ordon, Will Pate, Stuart Gill, Sheryl Silverman, Samhir Vasdev, Linda Adigwe, Immaculate Bampadde, Chonlada Sae-Hau, Patrick Mwangi and Nagaraja Rao Harshadeep. The team would also like to acknowledge the support of managers Julia Bucknall, Jae So and Philippe Dongier. Global partners provided invaluable support at each hackathon event location. The authors would like to acknowledge the invaluable contribution of event leaders Suryanarayanan A., Paul Rau, Andrew Petrovitch, Femi Longe, Bosun Tijani, Kiko Mayorga, Michael Niyitegeka, Julien Harou, Phares Kariuki, Jessica Colaco, Dan Nesher and Melanie Gorka. The full list of partners is included in Annex 4.