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Despite the central importance of water for human wellbeing and development, researchers and practitioners have few tools to quantitatively measure, assess, and compare the scope and scale of household and individual water insecurity across cultural and climatic variations. There are multiple definitions of water insecurity, and the analytical tools for measuring household‐level water insecurity are in their infancy. This paper provides an overview and systematic evaluation of current household and individual water in security metrics for human development. We seek to advance micro‐level metrics—attending to the considerations of dimensionality, temporality, unit of analysis, and comparability—because they will provide the research community with necessary tools to untangle the complex determinants and outcomes of water insecurity. Moreover, such metrics will support the translation of research outcomes …