The Stickney Water Reclamation Point in Illinois is one of the largest wastewater-treatment facilities in the world, serving about 2.3 million people and cleaning an average of 700 million gallons of wastewater a day. During rainfall, the facility can handle a whopping 1.44 billion gallons of wastewater in a single day — that's a million gallons every minute. The clean water is released into the Chicago Sanitary and Ship Canal, and the sludge that is removed from the water is converted to biosol