The Environmental Protection Agency has not done enough to ensure that all Americans have clean drinking water, according to a federal report released Tuesday.

The majority of water systems with serious violations of drinking water rules in 2011 had not come back into compliance by last year. Case studies across three regions revealed that human health risks may continue in some small community water systems, according to the report published by the U.S. EPA’s Office of Inspector General.

In Arizona, just three of 12 water utilities that received violations in 2011 had resolved their problems by April 2015. The 12 systems serve almost 5,000 people, according to the report.

The report did not name the Arizona water providers in question.

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