Mexico Approves $310M Desalination Plant for 1M People

One million people in Mexico's drought-prone Baja California will soon have access to a new, reliable source of clean drinking water that doesn't depend on shrinking rivers.

Spanish infrastructure company Grupo Cox won a $310 million contract to build a massive desalination plant in Rosarito, a coastal city south of Tijuana. The facility will convert Pacific Ocean seawater into 50 million gallons of fresh drinking water every single day when its first phase is complete in three years.

The project has been years in the making. Two previous attempts to award the contract failed when companies couldn't meet the technical and economic requirements, and a 2019 legal dispute with another contractor further delayed the desperately needed infrastructure.

Now construction can finally begin. Cox leads a consortium that includes Mexican engineering company Gami Ingenieria e Instalaciones, bringing expertise from operating desalination plants in 16 countries worldwide.

The plant will use reverse osmosis technology, which pushes seawater through special membranes that filter out salt, minerals, and impurities. This method is more energy efficient than older desalination techniques and produces higher quality drinking water.

When fully completed, the facility will double its output to 100 million gallons per day, making it the largest desalination plant in all of Latin America. That's enough to meet the needs of Rosarito and southwestern Tijuana while reducing dependence on the overtaxed Colorado River, which has suffered from severe drought for years.

The Ripple Effect

This project represents more than just new infrastructure. It's a lifeline for a region facing water scarcity made worse by climate change, offering resilience when traditional water sources run dry.

The federal and Baja California state governments are jointly funding the plant, showing commitment to long-term water security. For communities that have waited years while legal battles and failed contracts delayed progress, construction starting means hope is finally flowing.

Clean water access strengthens everything else: health, economic opportunity, and quality of life for one million people who can now count on reliable supply regardless of drought conditions. That's the kind of climate adaptation that protects communities while they continue growing and thriving.

Three years from now, Pacific seawater will flow through those membranes and emerge as fresh drinking water for families across the region.