The top ten were chosen for a number of reasons, including water quality:
“Water cleanliness rankings were derived from statistics compiled by the University of Cincinnati from local reports of EPA violations. Metros were ranked based on reports of bacteria, chlorine byproducts and chemicals or metals such as arsenic, copper and lead in the drinking water. Operational expenditures for solid-waste management are recorded at city-data.com.”
See the slide show here.
