Two billion people still lack access to clean water at home, and over three and a half billion lack safe sanitation. Water is not simply a resource — it is the foundation on which every other aspect of human life depends. Without it, children die of preventable disease, girls drop out of school to collect it, and harvests fail. SDG 6 calls for universal access to safe drinking water and sanitation, cleaner waterways, reduced water waste, and the protection of the lakes, rivers, and wetlands that keep the whole system alive.  blueprint for building a world that is fairer, healthier, more peaceful, and more sustainable than the one we have today.