Public Water Now is challenging the Monterey County Planning Commission’s approval of a combined development permit for California American Water’s proposed desalination plant project. On Thursday, the organization best known for backing a public takeover of Cal Am’s local water system filed an appeal to the Board of Supervisors of the Planning Commission’s narrow approval of a permit for the 6.4-million-gallon-per-day desal plant north of Marina and associated infrastructure. The appeal argues the desal project proposal fails to properly address several key details, including groundwater rights, and calls for the county to require a supplemental environmental review before considering the proposal.