Carlsbad Desalination Plant (USA)

The largest seawater desalination plant in the United States


An award-winning desalination plant in Carlsbad for the San Diego County Water Authority (SDCWA) that provides potable water to 400,000 consumers 

IDE and its partners worked for more than 10 years to develop a desalination solution that meets all the challenging criteria



  • Capacity: 204,412 m³/day (54MGD)
  • Water Source: Lagoon Seawater
  • Technology: Reverse Osmosis (RO)
  • Contract Type: Engineering ,Supply, Supervision of erection, startup and commisioning, Operation & Maintenance (O&M)
  • Location: Carlsbad, CA, USA
  • Customer: Poseidon
  • Offtaker: San Diego County Water Authority
  • Usage: Potable Water
  • Commissioning date: 2015


  • Cutting edge design

    Innovative pretreatment phase, resulting in higher efficiency, reduced energy consumption and high quality water.

  • Revolution for US desalination

    Ground-breaking project financing that relies on a true partnership model.

  • Environmental breakthrough

    First major California infrastructure project to eliminate its carbon footprint.


  • Desalination Deal of the Year 2013, Global Water Intelligence (GWI).

  • North American Water Deal of the Year, Project Finance Magazine

  • Far West Deal of the Year 2013, The Bond Buyer financial newspaper.

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