The D.C. Circuit dismissed a road building association's lawsuit challenging EPA regulations for nonroad engines and vehicles. The regulations pertain to CAA §209(e), which preempts certain state regulation of nonroad engines. The association petitioned EPA to amend those regulations to broaden the...

The U.S. Supreme Court holds that the national pollutant discharge elimination system (NPDES) permit program applies not only to point sources that generate pollutants, but also to point sources that transfer pollutants originating elsewhere. The definition of a point source as a "conveyance" in Cle...

A district court dismissed an environmental group's CWA action against a poultry farm claiming that it illegally discharged chicken litter into tributaries of the Chesapeake Bay. The group claimed that chicken litter, which is alleged to contain various pollutants, was discharged without a permit fr...

A district court held that EPA cannot regulate stormwater as a pollutant under the CWA. According to the court, the language of CWA §303(d)(1)(C) is clear. EPA may set TMDLs to regulate pollutants, and pollutants are carefully defined. Because stormwater runoff is not a pollutant under the Act, EPA...

The U.S. Supreme Court reversed a lower court decision holding a water district liable under the CWA for violating its municipal separate storm sewer system permit. The lower court ruled that the violations occurred when the polluted water detected at the monitoring stations flowed out of concrete-l...

The D.C. Circuit ordered EPA to repromulgate two final rules it issued under the CAA concerning the implementation of the NAAQS for fine particulate matter (PM). Environmental groups challenged EPA's decision to issue the rules pursuant to the general implementation provisions of Subpart 1 of Part D...