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U.S. border colonias are peri-urban settlements along the U.S.–Mexico border. Residents often face substandard housing, inadequate septic and sewer systems, and unsafe or inadequate household water. As of 2015, an estimated 30% of over 5 million U.S. colonia residents lacked access to clean drinking water, suggesting health complications. This scoping review identifies a very limited existing set of research on water and sanitation insecurity in U.S.–Mexico border colonias, and suggests value in additional focused research in this specific context to address health challenges. Preliminary health data indicates that due to water insecurity, colonia residents are more likely to contract gastrointestinal diseases, be exposed to carcinogenic compounds from contaminated water, and experience psychosocial distress. These widespread health issues in colonias are exacerbated by historical and ongoing socioenvironmental injustices in the U.S.–Mexico border region and their relation to the poor health outcomes.

Water scholarship has advanced considerably in recent decades. Despite this remarkable progress, water challenges may be growing more quickly than our capacity to solve them. While much progress has been made toward achieving Sustainable Development Goal 6 — water and sanitation for all — new stressors have emerged to threaten this progress. Far from being a problem of the Global South, recent research shows that water insecurity is very much a global phenomenon — and one that has been, until recently, seriously neglected in the Global North. This indicates a strong need for innovative measurement of who experiences water insecurity, new approaches for monitoring the efficacy of water interventions, and more effective management of complex, mobile, and multiple water infrastructures to achieve water security. In this paper, we introduce the Household Water Insecurity approach to addressing these concerns. First, we suggest ways to improve the measurement of water insecurity — pinpointing problems at the household and individual levels — in ways that can inform policymaking with improved precision. Second, we discuss ways that new information and communication technology can improve monitoring and indicate where water infrastructure repairs and investments are most needed. Third, we highlight the need for new approaches to managing complex water infrastructures in more inclusive and democratic ways.