The Second Circuit denied two petitions to review EPA's final rule restricting access by customers to methylene chloride.

The Ninth Circuit granted in part and denied in part a petition to review EPA's final rule approving California's SIP for meeting the air quality standard for ozone in the San Joaquin Valley.

A district court vacated and remanded EPA's and the Army Corps of Engineers' Navigable Waters Protection Rule, which established a new definition of "waters of the United States" under the CWA.

A district court dismissed a challenge to the president's Executive Order No. 13990, which established an interagency working group on the social cost of greenhouse gases (GHGs) and directed the group to publish interim estimates for the social costs of GHG emissions.

A district court denied summary judgment for the state of Missouri in a challenge to the Bureau of Reclamation's approval of a water supply project in North Dakota.