Map the scale and geography of water quality degradation, contamination sources, and infrastructure failure rates that render water unsafe. Assess the health, economic, and geopolitical consequences of the water crisis and identify priority intervention points.

Analysis of WHO/UNICEF JMP drinking water database across 189 countries. Water Quality Index assessment using dissolved oxygen, fecal coliform, and chemical contamination data from USGS and national water agencies. Infrastructure age and condition assessment from World Bank IBRD water sector data. Cross-referenced with WHO DALY (Disability-Adjusted Life Year) attributions for water-related diseases.

2.2 billion people lack safely managed drinking water; 3.5 billion lack safely managed sanitation. Diarrheal disease from unsafe water kills 420,000 people annually — mostly children under