This article presents a global analysis of threats to human water security and river biodiversity. It finds that nearly 80% of the world's population lives in areas with high threat levels, with major impacts in regions of intensive agriculture and dense settlement. While technological investments have improved water security in wealthy nations, they have not addressed underlying causes, leaving the poor vulnerable. Biodiversity is also threatened, with 65% of continental discharge classified as moderately to highly threatened. The study uses a spatial framework to quantify multiple stressors and assess their cumulative impact. It highlights the need for integrated water management strategies that balance human needs with ecosystem protection. The analysis shows that limiting threats at their source is more effective than costly remediation. The study also reveals that many rivers remain largely unaffected by human activity, particularly in remote areas. However, densely populated regions face significant threats due to pollution, land use changes, and water infrastructure. The study emphasizes the importance of addressing both human water security and biodiversity conservation through integrated approaches. It calls for major policy and financial commitments to address the global water crisis, as current efforts are insufficient to meet the needs of the world's poor. The study also highlights the need for further research to better understand the relationship between stressors and biodiversity loss. Overall, the study underscores the urgent need for global action to ensure water security for both humans and aquatic biodiversity.This article presents a global analysis of threats to human water security and river biodiversity. It finds that nearly 80% of the world's population lives in areas with high threat levels, with major impacts in regions of intensive agriculture and dense settlement. While technological investments have improved water security in wealthy nations, they have not addressed underlying causes, leaving the poor vulnerable. Biodiversity is also threatened, with 65% of continental discharge classified as moderately to highly threatened. The study uses a spatial framework to quantify multiple stressors and assess their cumulative impact. It highlights the need for integrated water management strategies that balance human needs with ecosystem protection. The analysis shows that limiting threats at their source is more effective than costly remediation. The study also reveals that many rivers remain largely unaffected by human activity, particularly in remote areas. However, densely populated regions face significant threats due to pollution, land use changes, and water infrastructure. The study emphasizes the importance of addressing both human water security and biodiversity conservation through integrated approaches. It calls for major policy and financial commitments to address the global water crisis, as current efforts are insufficient to meet the needs of the world's poor. The study also highlights the need for further research to better understand the relationship between stressors and biodiversity loss. Overall, the study underscores the urgent need for global action to ensure water security for both humans and aquatic biodiversity.