The court largely upholds a U.S. Environmental Protection Agency (EPA) rule mandating that 22 states and the District of Columbia revise their state implementation plans (SIPs) to mitigate ozone…

The court holds that the U.S. Environmental Protection Agency's (EPA's) decision to implement the direct federal underground injection control (UIC) program on certain New Mexico lands…

The court holds that the U.S. Environmental Protection Agency (EPA) did not exceed its discretion under §111 of the Clean Air Act (CAA) in promulgating new source performance standards (NSPS) for…

The court grants automakers' motion to stay their challenge to Massachusetts' zero emission vehicle standards pending the automakers' appeal of a U.S. Environmental Protection…

The court holds that the U.S. Environmental Protection Agency's (EPA's) adoption of a rule requiring compliance assurance monitoring (CAM) of major emission sources complies with the…

The court denies in part and grants in part the U.S. Environmental Protection Agency's (EPA's) petition for rehearing of a decision holding that EPA's revised national ambient air…

The court holds that the U.S. Army Corps of Engineers has jurisdiction under the Migratory Bird Rule to require a consortium of municipalities to obtain a Federal Water Pollution Control Act (…

The court holds a landowner liable under the Federal Water Pollution Control Act (FWPCA) for discharging polluted stormwater without a permit into a stream on his property that flows into ponds on…

The court holds that a district court has jurisdiction under the Quiet Title Act (QTA) to review an Interior Board of Land Appeals' (IBLA's) decision that a Native American's claim…

The court holds that the U.S. Environmental Protection Agency's (EPA's) Acid Deposition Standard Feasibility Study Report to Congress complied with the Clean Air Act's (CAA's)…