Every U.S. States Ranked by Best to Worst Drinking Water

For Maine, the biggest strength is how few people are impacted by unsafe tap water. EPA data shows that a relatively small portion of the population is served by water systems with health-based violations, especially compared to larger or more densely populated states.

Geography also plays a role in Maine’s ranking. Slower population growth means water systems aren’t under constant expansion pressure, which helps keep quality more stable. For residents, that often means fewer disruptions and more confidence that tap water will remain safe over time.