San Diego went to Las Vegas looking to deal some water and came home with a losing hand. County water officials spent the week trying to line up a taker for some of the region’s pricey desalinated ocean supply, pitching a swap that would turn that excess into tradable "paper water" credits. They left with no buyers and no commitments, which keeps those expensive desal contracts on the books and leaves ratepayers wondering what the next move will be.
As reported by Voice of San Diego, San Diego County Water Authority General Manager Dan Denham has floated the idea that Arizona could be a future customer. Meena Westford, the authority’s director of imported water, said the agency is already working with the U.S. Department of the Interior on a process that might allow sales across state lines. Under that concept, Arizona would pay San Diego to rely more on desalinated ocean water and less on Colorado River water, which could free up some of the river allocation for other users. According to Voice of San Diego, the delegation still left the conference without a firm deal in hand.
Paper Water, Not A Pipeline
“Paper water” is mostly an accounting maneuver instead of a literal shipment of water. It is about changing who is paid to use which source, not sending actual molecules over state borders. The Arizona Department of Water Resources explains that paper water refers to legal or accounting credits rather than the physical transfer of water, and that distinction shapes how these swaps are reviewed. Because the deals are on paper, they require detailed accounting of rights and multiple regulatory sign-offs, rather than new canals or pipelines.
Arizona’s War Chest For Desal
Arizona has been signaling interest in backing desalination and other water augmentation projects that, at least in theory, could be traded for Colorado River allocations. The state’s Water Infrastructure Finance Authority, or WIFA, voted in November to advance several proposals that include potential desalination plants in California or Baja California. However, any real-world supplies from those projects are still years away, according to the Arizona Capitol Times. Planning money, in other words, is not the same as near term water on the ground.
Voice of San Diego reported that WIFA has about $334 million available to spend on projects that actually generate water, and agency officials say most of that funding is meant to support supplies developed outside Arizona’s borders. WIFA’s executive director, Chelsea McGuire, told the outlet that the authority’s rules direct the bulk of the cash toward out-of-state augmentation projects. The money is largely aimed at early-stage development rather than immediate deliveries.
Federal And Regional Approvals Still Required
Even if a buyer stepped up tomorrow, any cross-border swap involving San Diego’s desalinated water would almost certainly require federal approval and cooperation from some of the largest Colorado River players, including the Metropolitan Water District of Southern California and the Imperial Irrigation District, which control significant river rights. The San Diego County Water Authority has stated publicly that it is considering transfers as one option to help offset costs while maintaining regional reliability, describing such deals as a tool to help offset the cost of multi-generational water investments. At the same time, the agency notes that these arrangements come with complicated contracts and layers of review.
The lack of a broader agreement in Las Vegas also highlights a deeper stalemate on the river. Negotiators for the seven Colorado River basin states remain divided over how the system should operate after 2026, and federal officials, including the U.S. Bureau of Reclamation, are still urging those states to find common ground to avoid courtroom battles, The Associated Press reported. That unresolved future makes it even more challenging to secure any multi-state paper water trades in the near term.
For now, San Diego’s proposal sits on the board as a possible piece of a long-term solution rather than a quick fix. The next chapters will hinge on what WIFA funds, how the Department of the Interior designs cross-state rules, and what the Water Authority can negotiate. Only then will it be clear whether paper deals ever materialize into real deliveries and how that will impact local water rates.
