Orange County sees past Poseidon’s efforts to buy support for its desalination boondoggle. Why can’t Gov. Newsom? Poseidon Water, a large water development company, has been pushing to build a $1.4-billion water desalination plant in Huntington Beach. Like Poseidon’s underperforming, high-cost plant in Carlsbad, the plant and its inflated water would be paid for by ratepayers.