New research has identified hotspots in the US with concerning levels of water quality and poor access to clean drinking water, revealing that Mississippi, Pennsylvania, Arizona, and Washington had the most water quality violations across the board. The paper, published Tuesday in the journal Risk Analysis, also developed county-level scores across most of the country for unequal access to safe and clean drinking water, finding that eight of the 10 counties with the worst “water injustice” scores were in Mississippi, with the other two in Texas and South Dakota. … “You can see some pretty stark differences between states,” said study lead author Alex Segrè Cohen, a social scientist at the University of Oregon. In Arizona, Mississippi, and Pennsylvania, “almost every county has high water violation scores,” she said.