The U.S. Supreme Court reversed and remanded a lower court decision vacating EPA's transport rule, also known as the Cross-State Air Pollution Rule, which sets sulfur dioxide and nitrogen oxides emissions limits for 28 upwind states based on those states' contributions to downwind states' air qualit...

A district court dismissed three New Hampshire cities' citizen suit challenging EPA's decision to approve New Hampshire's impaired waters list under the CWA. The cities lack standing because the regulatory decisions that the cities challenge have not yet caused them harm, and whether cities will be ...

The D.C. Circuit vacated a portion of EPA's 2013 rule regulating air emissions from Portland cement kilns. The court concluded that the emission-related portions of the rule are permissible under the CAA. It also upheld the compliance schedule implementing some of the 2013 rule's emission standards....

The D.C. Circuit upheld the emission standards EPA promulgated in 2012 for mercury and other listed hazardous air pollutants emitted by coal- and oil-fired electric utility steam generating units. The rule was challenged by industry, saying the rule was too stringent, as well as by environmental gro...

 The primary standards for carbon monoxide have remained the same since 1971. There has not been a secondary standard for carbon monoxide since EPA revoked a secondary standard in 1985. In 2007, EPA began reviewing whether to alter the current primary standards and whether to adopt a secondary ...

A district court issued a memorandum opinion and order holding that the West Virginia Department of Environmental Protection may temporarily, but not indefinitely, suspend the requirement that permit holders that do not have selenium limits or monitoring and reporting requirements on their face must...

A district court dismissed an environmental groups' citizen suit against a water authority for alleged CWA and state law violations in connection with the discharge of stormwater from a municipal separate storm sewer system to the Allegheny River. The groups did not argue that the authority violated...