The Sixth Circuit issued a nationwide stay enjoining the "waters of the United States" rule pending the court's determination as to whether it has subject matter jurisdiction to review the rule.

The Second Circuit remanded portions of EPA's 2013 general NPDES permit for ship ballast water, a primary cause of the spread of invasive species from one body of water to another.

A district court, on motions for summary judgment, held that a marine fueling, service, and storage facility in Seattle was liable under the CWA for various NPDES general permit violations.

A district court denied in part motions to dismiss as time barred Puerto Rico's lawsuit against various oil companies for methyl tertiary butyl ether (MTBE) groundwater contamination.

The Supreme Court of New Hampshire upheld a $236 million jury award against an oil company for groundwater contamination.

A North Carolina appellate court upheld the constitutionality of state legislation that withdrew a city's authority to own and operate its public water system and to instead transfer it to a sewer district.

A district court held that the U.S. Forest Service did not violate NEPA or the APA when it reissued a 30-year special use permit allowing an energy company to continue operating a portion of a 1,100-mile pipeline through the Huron-Manistee National Forest.