This city moved up in the rankings from 5th in 2015 to 3rd this year. Independence supplies water to about 250,000 people. [See: 20 Surreal Places to See the Clearest, Bluest Water on Earth] It comes from 42 wells, located at the Courtney Bend Water Treatment Plant. They receive water from the Missouri River Alluvial Aquifer, classified as a ground water source. The well water is softened and disinfected at the treatment plant, and meets or exceeds all federal and state quality regulations, according to the latest quality report.