Without explanation, the State Supreme Court has declined to consider a legal challenge backed by the Marina Coast Water District and city of Marina against the state Public Utilities Commission’s approval of California American Water’s proposed Monterey Peninsula water supply project.

Last week, the state’s high court issued notice that it had denied the petition for review of the CPUC decision in September last year certifying an environmental review document for Cal Am’s water project, including a 6.4-million gallon per day desalination plant north of Marina, and approving a permit for the proposal. The court did not include any rationale for denying the legal challenge and has rarely considered challenges to CPUC decisions.