The Fourth Circuit denied environmental groups' petition to review Virginia's issuance of §401 certification under the CWA for construction of a natural gas pipeline. The groups argued that state agencies acted arbitrarily and capriciously in issuing the §401 certificate because the agencies didn'...

The Ninth Circuit granted environmental groups' petition to review EPA's 2017 order maintaining a tolerance for the pesticide chlorpyrifos, and vacated the Agency's order. The groups argued that the Agency's need for additional scientific research was not a valid ground for maintaining a tolerance t...