A California appellate court affirmed a lower court decision dismissing a petition challenging an air district's abatement order directing the owners of an open-pit mining operation to cease operation of the central plant equipment and all internal combustion engines with a rating greater than 5...

The Supreme Court of Washington held that state law does not limit the amount of water that can be withdrawn from groundwater for livestock-watering purposes. Local farmers and environmentalists sought a declaration that the stockwatering exemption from state permitting requirements is limited t...

A district court held that Washington state must establish reasonably available control technology (RACT) for greenhouse gas emissions. Based on its plain language, the RACT provision contained in Washington's federally approved SIP is not discretionary and requires the state's agencies to estab...