We seek to advance a critical and relational concept of urban water security that theorizes urban processes in relation to the hydro-social dynamics that produce experiences of water securities and insecurities at multiple scales. Our intention is to set out an analytical framework that both examines the social relations that underpin water insecurity and goes beyond the urban as merely the context in which water provision and risk take place. We seek to mobilize this concept to envision meaningful water policies and hydro-social practices to enhance social equity and empowerment for urban communities.