The Tenth Circuit held, 2-1, that a sovereign must affirmatively act to extinguish aboriginal water rights in a lawsuit concerning water rights of the Pueblos of Jemez, Santa Ana, and Zia in the Jemez River Basin in New Mexico. The district court had concluded that the Pueblos' water rights were ext...

The Nevada Supreme Court held that the public trust doctrine did not permit reallocation of water rights already adjudicated and settled under the doctrine of prior appropriation in a lawsuit concerning established water rights for a deteriorating lake in western Nevada. The court found that while t...

A district court denied a motion to reconsider its 2018 ruling that gave EPA discretion as to how to establish a new TMDL for trash in the Anacostia River. An environmental group argued that little progress had been made since the 2018 ruling and that the court should require the Agency to establish...

The Tenth Circuit upheld a lower court ruling ordering mining and finance companies to comply with EPA's requests for information related to cleanup of a contaminated site in Utah. The companies argued that EPA exceeded its authority under CERCLA when it issued the information requests, the requests...

In an unpublished opinion, the Ninth Circuit granted in part and denied in part an environmental group's petition to review EPA's approval of the Idaho Pollution Discharge Elimination System (IPDES). Specifically, the court denied the petition with respect to the group's challenges concerning the st...

A district court held that an oil company was liable for a plume of gasoline beneath a former gasoline station that was migrating toward nearby housing units in White Plains, New York. A housing authority brought claims under RCRA, arguing its property was contaminated by discharges of gasoline and ...

The Third Circuit held that a PRP's settlement with New Jersey resolving its state-law liability in connection with contamination at a municipal landfill did not protect the party from lawsuits seeking contribution toward expenditures made by EPA on the same site. The district court had concluded th...

The Washington Supreme Court upheld the Department of Ecology's rule that set a summertime minimum instream-flow rate for the Spokane River at 850 cubic feet per second (cfs). Environmental groups challenged the validity of the flow rate, arguing that setting minimum flows at 850 cfs exceeded the De...

A district court denied injunctive relief to residents in a lawsuit concerning soil and groundwater contamination at and adjacent to a manufacturing facility in Goshen, Indiana. Residents living adjacent to the facility brought a citizen suit under RCRA, arguing that the contamination might present ...

The Sixth Circuit dismissed as moot a lawsuit seeking to preliminarily enjoin EPA's 2015 Clean Water Rule that clarified the definition of "waters of the United States" under the CWA. Ohio and Tennessee challenged the validity of the rule, arguing it extended the scope of the CWA beyond the reach of...