After twelve years of planning and over six years in the state’s permitting process, the Carlsbad Desalination Project has received final approvals from every required regulatory and permitting agency in the state, including the California Coastal Commission, State Lands Commission and Regional Water Quality Control Board. A 30-year Water Purchase Agreement is in place between the San Diego County Water Authority (SDCWA) and Poseidon for the entire output of the plant. Construction on the plant and pipeline is under way and the Project will be delivering water to the businesses and residents in San Diego County by 2016.

Poseidon specializes in developing and financing water infrastructure projects, primarily seawater desalination and water treatment plants. Poseidon’s projects are implemented through innovative public-private partnerships that link private financing with the construction and operation of water supply and treatment projects.


  • With Financing Complete, Poseidon Inks Deals for Construction, Operation of Carlsbad Desal

    SAN DIEGO - Poseidon Water has closed the $922 million financing and secured all funding needed to build the Carlsbad Desalination Project, capping a decade-long development effort to create the largest seawater-desalination plant in the Western Hemisphere. Read more.

  • 4th District Appellate Decision in Favor of Poseidon

    The 4th District Appellate court has ruled in favor of Poseidon Water in the case of Surfrider Foundation vs. California Regional Water Quality Control Board, San Diego Region. From the ruling: "Surfrider Foundation (Surfrider) appeals from the trial court's denial of its petition for a writ of mandamus challenging the approval of the National Pollutant Discharge Elimination System (NPDES) permit by the California Regional Water Quality Control Board, San Diego Region (the Regional Board) for a ..." Read more.

  • Two More Favorable Decisions Move Poseidon's Desalination Project Forward

    Just one day after the San Diego County Water Authority Board of Directors approved a 30-year contract to purchase water produced by the proposed Carlsbad Desalination Project, two more favorable decisions are helping to move forward Poseidon Waters’ project. Read more.

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