The D.C. Circuit granted in part and denied in part a petition challenging EPA's update to the Cross-State Air Pollution Rule. Environmental groups and Delaware argued that EPA violated the CAA by failing to require upwind states to eliminate their significant contributions in accordance with the de...

The D.C. Circuit upheld EPA's implementation of its Renewable Fuel Standards Program, which requires transportation fuel sold in the United States to contain a minimum volume of renewable fuels. Some industry groups argued that EPA arbitrarily refused to revise its 2010 point of obligation rule that...

The D.C. Circuit upheld EPA's decision not to issue financial responsibility requirements for the hard-rock mining industry. Environmental groups argued the decision violated CERCLA by wrongly interpreting the term "risk" in the operative provisions as limited to the risk of taxpayer-funded response...

The D.C. Circuit upheld an EPA rule that classified as "recycled" certain hazardous material sent to a third-party reclamation facility and thus exempted the material from RCRA regulations governing discarded waste. Environmental groups argued the rule violated RCRA because material that a generator...

The D.C. Circuit dismissed a petition to review EPA's order denying an environmental group's objection to renewal of a Title V operating permit for a power plant in Utah. The group objected that the renewal permit incorporated requirements in a 1997 Title I preconstruction permit that was based on a...

The D.C. Circuit dismissed in part and denied in part a petition to review EPA's 2016 revisions to its ambient air quality monitoring system regulations. An environmental group argued that the revisions violated the CAA by not requiring states to give advance notice and hold a public hearing when ma...

The Ninth Circuit reversed a district court's dismissal of a challenge to the use of lead ammunition in Kaibab National Forest. Environmental groups sought to require the U.S. Forest Service to address the use of lead ammunition by hunters in the national forest, alleging the the Service's failure t...

A district court granted in part summary judgment against EPA for failure to implement its 2016 Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills. Eight states argued that the Agency failed to implement and enforce the guidelines by (1) failing to approve or disapprove exi...

The D.C. Circuit denied downwind states' petition challenging EPA's refusal to expand the Northeast Ozone Transport Region, which consists of states required by the Agency to enact tight restrictions on pollutants that contribute to ozone that drifts across state lines. The downwind states argued th...

A district court denied a city's motion for a preliminary injunction in a RCRA lawsuit against two utility companies that owned a long-abandoned manufactured gas plant. The city alleged that the plant had contaminated soil in a nearby park and around a decommissioned water main, and sought to requir...