On Monday, U.S. District Court Judge John C. Coughenour denied American Petroleum Institute's (API) motion to intervene in Center for Biological Diversity v. EPA, a suit in federal court in Washington State attempting to force the EPA to consider ocean acidification when evaluating state water quality under the Clean Water Act. The Clean Water Act requires each state to submit an "impaired waters" list to EPA every two years, and EPA must either approve or disapprove each state's list. The Center for Biological Diversity claims that EPA violated federal law by approving Washington's most recent impaired waters list, which did not include any ocean water areas affected by acidification. API sought to intervene in support of EPA, arguing that because some of its members currently hold licenses to discharge into Washington's coastal waters, it has an interest in the litigation that would not be adequately represented by EPA.