8 States with the Most Fluoridated Water in the US

4. North Dakota

Population served by CWS that have fluoridated water (%): 96.50%

Fourth on the list, North Dakota is a landlocked US state located in its upper, mid-west part. The US Census reports the population of the state to be 783,926. The community water systems supply water to 731,260 residents of the state, and out of these, 705,703 receive fluoridated water.