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Alvarado Water Treatment Plant

Alvarado WTP---large

Alvarado Water Treatment Plant Ozone Upgrade and Expansion Project, San Diego, CA 

First ever use of submersible propeller pumps in an ozone disinfection process


Facing declining source water quality and greater consumer demand, the City of San Diego increased the capacity of its Alvarado Water Treatment Plan from 120 to 200 million gallons per day, and incorporated an ozone process to provide lower levels of carcinogenic disinfection by-products, while producing an odorless, better-tasting water.


  • Large WTP expansion leverages economy of scale to ensure future water supply at affordable cost.
  • Unique Hybrid Constant Concentration ozone dosing control logic minimizes chemical, energy, and maintenance costs, and also reduces plant downtime.
  • First time ever use of submersible propeller pumps in an ozone disinfection process reduces maintenance, and virtually eliminates associated mechanical noise improving both workplace safety and community aesthetics.
  • Conversion from chlorine to ozone disinfection reduces carcinogenic DBPs in the treated water supply, far exceeding state and federal standards, while providing a more aesthetic, and odorless water with better taste.


  • Project Entrant: City of San Diego
  • Design Team: Malcolm Pirnie/Arcadis
  • Construction Manager: CH2M Hill
  • Contractor: Archer Western Contractors

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