Cities with the cleanest tap water are located in the states of Iowa, Texas, South Dakota, Florida and Alabama, as of 2014. Since the concentration of contaminants varies based on city, cleanliness rankings are based on city rather than state.
Some top-rated cities for water cleanliness include Arlington and Fort Worth in Texas and Providence, Rhode Island, all of which have low levels of toxic chemicals such as arsenic and nitrate. The water system in Des Moines, Iowa has low levels of both bacteria and pollutants such as lead. Sioux Falls, South Dakota has low levels of haloacetic acid in its tap water. In general, smaller water utility systems have fewer pollutants than larger systems.