The air and water quality subcategory informs the best states for natural environment rankings and the overall Best States rankings. It comprises two measures: the number of days with an air ...

The drinking water quality metric is one of many that factor into the overall Best States rankings. See the Best States methodology for a detailed look at the data behind the analysis. 50 States ...

"As the first study that looks at water supply, demand and quality across the lower 48 states, it can help support informed decision making for sustainable water management." Between 2010 and 2020 ...