Multi-state lawsuit challenging the federal government’s decision to delay the effective dates of final rules governing energy efficiency for six products.

Multi-state lawsuit challenging EPA failure to act on petition requesting that the agency regulate ozone pollution from sources in upwind states.

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.

Washington filed a citizen suit under RCRA alleging that worker exposure to chemical vapors at decommissioned nuclear production site constituted an “imminent and substantial endangerment to human health and the environment.”

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

Multi-state lawsuit to compel the United States Army Corps of Engineers and the Metropolitan Water Reclamation District of Greater Chicago to take action to prevent Asian carp from crossing from the Mississippi River Basin into the Great Lakes.

Multi-state suit to compel EPA to review and revise New Source Performance Standards for wood burning devices.

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.

Massachusetts AG filed an administrative appeal filed by a lawsuit challenging the adequacy of the Nuclear Regulatory Commission’s consideration of the environmental consequences of renewing the license for the Pilgrim Nuclear Power Plant.

States joined NRDC lawsuit challenging the DOE’s attempt to lower energy efficiency standards for certain appliances under the Energy Policy and Conservation Act (ECPA).

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.

Multi-state lawsuit to force EPA to comply with Clean Air Act requirement to update and revise National Ambient Air Quality Standards (NAAQS) every five years.

New Jersey and environmental groups sued the Army Corp. for not supplementing their EIS after an oil spill in the Delaware River.

California sued the U.S. Forest Service for its plan to allow road development through certain wilderness areas in California, including habitats for endangered species. The parties reached a settlement in 2010.

Delaware and New Jersey brought action pursuant to the APA to challenge a decision made by the US Army Corp of Engineers to proceed with a dredging project to deepen the main navigation channel of the Delaware River without obtaining requisite approval pursuant to the CWA, CAA, CZMA, and Delaware code.

Multi-state lawsuit challenging the adequacy of EPA’s 2006 revision to the National Ambient Air Quality Standards (NAAQS) regulating soot pollution under the Clean Air Act.

Multi-state challenge to EPA decision to remove fossil fuel-fired power plants from list of sources regulated under CAA section 112 (hazardous air pollutants) and to establish new performance standards for mercury emissions from these plants under CAA section 111.

Multi-state action against EPA for failure to set NSPS standards for oil refineries.

Multi-state challenge to EPA denial of petition to regulate greenhouse gas emissions from motor vehicles under Clean Air Act.

Multi-state challenge to 2002 EPA rule amending and expanding the routine maintenance, repair and replacement exceptions to the New Source Review program.

Multi-state lawsuit challenging the Department of Energy (DOE)’s failure to create energy efficiency standards for consumer appliances according to the timeline established by the Energy Policy and Conservation Act (ECPA).

Multi-state challenge to 2002 EPA rule amending the New Source Review (NSR) program and narrowing the definition of “modification” to exclude certain sources from NSR requirements.