India faces significant challenges with water security and sustainable drinking water services at scale. [1] Over 90% of households have access to basic drinking water infrastructure but only 60-80% receive reliable service delivery due to source unsustainability issues. [2] Investment has focused on hardware but needs to address long-term water security and source sustainability to prevent systems from failing after a few years. [3] Water resources are declining rapidly due to overuse, competing demands, and pollution, threatening drinking water services without improved governance, financing, and a focus on source sustainability.