California sent a Freedom of Information Act Request to the EPA for documents related to EPA head Scott Pruitt’s conflicts of interest.

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

California and Connecticut intervened in lawsuit challenging EPA’s determination to retain existing GHG emission standards for light-duty vehicles.

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

Connecticut AG partnered with other government and private entities to provide kits for the safe disposal of prescription medication, one goal being to reduce water pollution.

Michigan AG launched investigation to determine criminal and civil liability for violations of state law that caused or contributed to the Flint Water Crisis.

Washington sued Monsanto for damages to the state’s natural resources and cleanup costs associated with pollution from PCBs.

Multi-state settlement of consumer-protection claims against car manufacturers that overstated their vehicles’ fuel efficiency.

New Jersey AG represented New Jersey Department of Environmental Protection in action against developer, holding company for developer, and company’s owner seeking to enforce prior directives to effect repairs and maintenance as required by the Safe Dam Act.

California Attorney General amended regulations under Proposition 65, a California disclosure law related to exposure to toxic chemicals.

Twelve states joined in defense of EPA’s new source performance standards for methane and VOC emissions from the oil and gas sector.

California AG, working with the federal EPA, entered into two related settlements over Volkswagen’s use of defeat devices to evade emissions testing.

Settlement of consumer protection claims raised by a multi-state coalition of state attorneys general against Volkswagen for selling vehicles equipped with “defeat device” software intended to circumvent emissions standards and concealing this software from regulators and the public.

Letters and testimony providing recommendations on federal legislation amending the Toxic Substances Control Act (TSCA) to revise the process and requirements for evaluating and determining whether regulatory control of a chemical is warranted.

Group of 17 state AGs and Former Vice President Al Gore announced a coalition of states committed to taking creative steps to combat climate change, including investigations into fossil fuel companies and climate-related disclosures.

Indictment of Plains All American Pipeline on Criminal Charges Resulting from the Refugio Oil Spill

Oregon, California, and Washington joined in defense of Oregon’s Low Carbon Fuel Standard.

Michigan AG submitted letter to Secretary of State John Kerry urging him to deny the permit application for the St. Clair River oil pipelines.

Multi-state consent degree settling civil claims between gulf states and BP for civil penalties and damages to natural resources.

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.

Investigation into whether ExxonMobil’s activities in the climate science sphere constitutes a violation of New York’s Martin Act, which prohibits publicly traded companies from misleading investors.

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.

Massachusetts AG submitted comments to Federal Energy Regulatory Commission and a study opposing a proposed natural gas pipeline that would have run through New England.

Multi-state intervention to join EPA’s defense of Clean Power Plan against challenge mounted by other states and industry petitioners.

Multiple states joined as defendant-intervenors in support of EPA in lawsuit challenging New Source Performance Standards (NSPS) for carbon dioxide emissions from new and modified power plants.

Michigan AG convened the Michigan Petroleum Pipeline Task Force to investigate the safety of the Straits pipelines.

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.”

Multiple sates intervened to support EPA’s defense of the Waters of the U.S. rule.

Tennessee AG filed suit against Chevron alleging that the company illegally used taxpayer funds to pay for spill clean up costs.

Multiple states intervened in lawsuit to defend EPA standards regulating mercury and other air pollutants from the power sector.

Michigan AG pursued enforcement action against Enbridge Energy in response to their actions which caused over 1 million gallons of heavy crude oil to spill into the Kalamazoo River.

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

Illinois AG co-authored legislative proposal to regulate bulk materials storage facilities that handle petroleum coke and other refinery production materials in response to air pollution violations linked to several facilities on Chicago’s southeast side.

Michigan AG brought enforcement action against waste management companies to reduce foul odor emanating from the United States’ largest waste incineration facility.

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.

Multiple states intervened in lawsuit to defend EPA rules concerning regulation of greenhouse gas emissions from stationary and mobile sources.

Multiple states intervened in lawsuit to support EPA rule on cross-state air pollution against state and industry challenge.

Multi-state intervention in support of Energy Department proposed rule setting efficiency standards for residential gas furnaces.

Illinois AG sued and entered into settlement with the Illinois Department of Natural Resources (DNR) requiring DNR to improve transparency and public participation in the coal permitting process.

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.

Multi-state coalition reached agreement with U.S Department of Energy establishing timetable for updating federal efficiency standards for energy-intensive consumer products.

California AG filed an amicus brief in a case involving the Port of Los Angeles “Clean Trucks Program,” which was designed to improve diesel emissions and air quality.

Florida AG and U.S. government reached settlement with County of Miami-Dade regarding violations of federal and state water pollution laws at three wastewater treatment plants.

California AG brought a lawsuit against three plastic water bottle companies for misleading claims of biodegradability. This was the first “greenwashing” suit of its kind.

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.

California AG intervened in and helped to settle litigation surrounding an industrial project that was expected to increase diesel truck traffic in a predominantly Latino residential area.

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 request for EPA to issue methane standards under the Clean Air Act.

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.

California AG intervened in a suit attempting to require the San Diego Association of Governments (SANDAG) Regional Transportation Plan to consider climate change in its long term planning decisions.

Federal common law nuisance claim against five major electric power companies for their contribution to climate change through greenhouse gas emissions.

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.

After years of litigation and settlement attempts between environmental and wind turbine industry groups, the California AG’s office stepped in and brokered a settlement to protect migratory birds.

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.

Multiple states moved to intervene in litigation concerning the 2012–2016 light duty motor vehicle emissions standards.

California AG filed brief with the California Public Utility Commission defending the state’s authority to use feed-in tariffs.

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.

State AGs intervened in lawsuit to defend California’s greenhouse gas emission standards for motor vehicles against challenge alleging that the standards are preempted by the Energy Policy and Conservation Act (EPCA).

The State of California entered into a landmark climate change settlement with San Bernardino County setting forth a specific greenhouse gas reduction plan.

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

Multi-state litigation under Clean Air Act alleging violations of New Source Review permitting process to reduce sulfur dioxide emissions in coal-fired power plants.

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.

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.