Oregon and Washington AGs filed multiple lawsuits against the Department of Energy (DOE) concerning the cleanup and processing of nuclear waste stored in Hanford, Washington.

Joint prosecution between the State of California and the County of Ventura against Santa Clara Waste Water, its parent company, and individual employees for criminal violations stemming from hazardous waste disposal.

Tennessee attorney general filed lawsuit against TVA alleging that a power plant was contaminating water sources.

Washington and South Carolina AGs pursued mandamus action to force the Nuclear Regulatory Commission to proceed with the licensing process of Yucca Mountain as a nuclear waste repository.

Multi-state challenge to a Nuclear Regulatory Commission rule on storage of spent nuclear fuel, resulting in a decision that the rule was a major federal action that requires the agency to either make a finding that the action would have no significant environmental action or issue an environmental impact statement.

Washington State intervened and multiple states submitted Amicus Briefs in lawsuit filed by Native American tribe against Canadian smelting company for polluting the Columbia River and Lake Roosevelt.