Arizona Advanced Desalination Project Appraisal
The state's water authority moved toward a cross-border deal to secure future supplies amid persistent drought conditions.
Updated on Oct. 5, 2026 in Utilities
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The Water Infrastructure Finance Authority of Arizona approved an appraisal scope on September 16, 2026, for a proposed desalination plant in Baja California, Mexico. The facility aims to supplement Arizona’s water supply by integrating desalinated output into the Colorado River system.
Why it matters
Prolonged drought in Arizona has strained traditional water sources, necessitating alternative strategies to bypass rigid delivery constraints under the 1944 Water Treaty. This project seeks to secure long-term supply stability for the state by leveraging cross-border infrastructure.
Mexico is currently required to deliver 431.7 million cubic meters of water annually under the 1944 Water Treaty, but fulfilled only 29.2 percent of the 2,158.6 million cubic meter total required for the 2020-2025 cycle. The proposed plant aims to deliver up to 1.7 million cubic meters per day to Arizona starting in 2034.
The players
Water Infrastructure Finance Authority of Arizona
A state agency tasked with financing and developing water infrastructure projects to ensure long-term resource security.
Sacyr
An international infrastructure and services company specializing in the development of large-scale water treatment and desalination facilities.
Arcadis
A global engineering and design consultancy that provides technical oversight for large civil infrastructure and water resource projects.
Plenary Americas US Holdings
A developer and manager of long-term public-private partnership infrastructure projects across North America.
The details
The project, led by a consortium including Sacyr, Arcadis, and Plenary Americas US Holdings, involves building a desalination plant in Baja California. A pipeline would connect the facility to the Morelos Dam, facilitating an exchange where Mexico trades desalinated water for a portion of its Colorado River allocation. This operational mechanism allows Arizona to tap into a new water source while helping to navigate the complex delivery obligations mandated by federal treaty frameworks.
Timeline
2020-2025: Period of the previous water delivery cycle.
February 2026: Mexico committed to a 432 million cubic meter annual supply.
September 16, 2026: WIFA board approved the desalination plant appraisal scope.
2034-2039: Potential window for water delivery to Arizona.
Market Landscape
This project attempts to resolve water supply volatility by bypassing rigid delivery constraints defined in the 1944 Water Treaty. It represents a significant departure from domestic-only conservation efforts by integrating international desalination capacity into the Colorado River system.
Operators in sectors reliant on consistent water access should monitor the project's progress as it influences long-term regional utility pricing and availability. While initial development is years away, the integration of new supply sources could eventually alter the risk profile for local water-intensive businesses.
The takeaway
Large-scale desalination could change the regional water equation by mitigating the impact of recurring drought conditions on industrial supply. Owners should watch for board updates regarding the project's financial viability, which could provide signals for future utility rate planning.
Further reading
For more on infrastructure trends, see our Utilities section.
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