California's innovative approach to addressing the Colorado River crisis: Desalination as a solution
As desert cities like Phoenix and Tucson brace for drastic reductions in their Colorado River water allocations, San Diego County's water agency is poised to make history by selling water to other states for the first time. This groundbreaking move involves tapping into the region's abundant resources from the nation's largest desalination plant.
The San Diego County Water Authority's board unanimously approved an initial agreement last week, paving the way for potential water sales to Arizona and Nevada. These states heavily rely on the over-exploited Colorado River, and the agreement aims to address the anticipated water supply cuts. General Manager Dan Denham emphasized the urgency, stating that interstate water transfers could commence as early as next year if approved by relevant agencies.
The Colorado River's diminishing flow, exacerbated by drought and climate change, has led to a critical situation. The river's reservoirs have significantly decreased over the past 25 years, impacting farms, cities, and tribal communities across seven states and northern Mexico. Negotiations among the seven states have been challenging, with disagreements on water cutbacks to prevent further reservoir decline.
San Diego County Water Authority officials propose selling water across state lines, allowing Arizona and Nevada agencies to purchase Colorado River supplies. The revenue generated would be reinvested to reduce costs for ratepayers. This agreement, a memorandum of understanding, requires approval from the Metropolitan Water District of Southern California, the federal government, and agencies in Arizona and Nevada. Subsequent negotiations will determine the details.
San Diego County's water security is attributed to substantial investments in additional water supplies. The Claude "Bud" Lewis Carlsbad Desalination Plant, operational since 2015, has been a key asset. The authority secured water through a 2003 agriculture-to-urban transfer deal, resulting in a plentiful water supply. However, this abundance comes with a trade-off: San Diego County has some of the most expensive water in the state.
The Carlsbad desalination plant operates below full capacity, and increasing its output could provide a larger share of the region's water. This expansion is contingent on out-of-state agencies purchasing Colorado River water from San Diego County. Conservation efforts and upcoming wastewater recycling projects further contribute to the region's water sustainability.
If successful, the Water Authority is prepared to sell up to 10,000 acre-feet of water starting next year, equivalent to nearly 5% of the Las Vegas area's current water use. This could increase to 25,000 acre-feet or more in future years, with potential expansion of the Carlsbad desalination plant to transform more seawater into drinking water.
Governor Gavin Newsom and Scott Cameron, the Trump administration's acting head of the U.S. Bureau of Reclamation, have expressed support for this approach. However, the Metropolitan Water District's board must still vote on the proposed agreement. Shivaji Deshmukh, the district's general manager, advocates for a regional perspective on water resources, transcending political boundaries.
While the proposed water sales may seem insignificant compared to the overall water shortfall, Denham believes this approach could be a pivotal step in demonstrating the effectiveness of interstate agreements in alleviating water shortages. This innovative strategy holds promise for a more sustainable water future, but its success relies on collaboration and support from various stakeholders.
