What's Happening?
The California State Water Resources Control Board has released a revised draft water right decision and draft permit for the proposed Sites Reservoir project. This revision follows two years of public proceedings and aims to balance the project's water supply
benefits with the protection of senior water right holders, water quality, and flows for fisheries. The Sites Reservoir, if approved, would be the largest reservoir built in California in over 50 years, with a capacity of 1.5 million acre-feet. It is designed to increase the state’s water supplies by diverting water from the Sacramento River during high flow periods and storing it for future use by farms, cities, and the environment. The revised drafts would authorize the project to divert up to 986,000 acre-feet of water annually, enough to supply approximately 8.4 million people. Key revisions expand opportunities for water diversion and ensure alignment with the recently released final draft Water Quality Control Plan for the San Francisco Bay/Sacramento-San Joaquin Delta (Bay-Delta Plan). The board will accept final written comments until October 5, 2026, and plans to consider adopting the decision and permit at its public meeting on November 4, 2026.
Why It's Important?
This revised draft decision for the Sites Reservoir project is critically important for California's long-term water security and environmental sustainability. The proposed reservoir represents a significant investment in the state's water infrastructure, aiming to add 9 million acre-feet of new water supply or capacity by 2040, which is vital for strengthening climate resilience and water reliability. The project's ability to divert and store water during periods of high flow from the Sacramento River offers a strategic solution to California's perennial water challenges, particularly in the face of climate change and increasing demand. The careful balancing act between water supply benefits and environmental protections, including those for fisheries and water quality, underscores the complex trade-offs inherent in large-scale water projects. The alignment with the Bay-Delta Plan is crucial for ensuring ecological health in a vital ecosystem. This decision will impact agricultural sectors, urban water suppliers, and environmental conservation efforts across the state, determining how California manages its most precious resource for decades to come.
What's Next?
The immediate next step involves a public comment period, which will conclude on October 5, 2026. During this time, stakeholders, environmental groups, water users, and the general public can submit their final written comments on the revised draft decision and permit. These comments will be reviewed by the State Water Board, which will then consider adopting the draft water right decision and water right permit at its public meeting on November 4, 2026. If adopted, the Sites Project Authority will proceed with the necessary steps to implement the reservoir project, including further environmental reviews, securing funding, and commencing construction. The project's proponents, including state and federal agencies, public irrigation districts, and urban water suppliers, will then work to integrate the new water supply into their existing systems. The long-term implications will involve ongoing monitoring of environmental impacts, water quality, and the project's effectiveness in meeting California's water supply goals.
Beyond the Headlines
The Sites Reservoir project, and the State Water Board's revised decision, highlight the intricate legal and environmental challenges associated with large-scale infrastructure development in a resource-constrained region. The extensive public proceedings, involving 32 hearing days, 21 parties, 60 witnesses, and over 2,000 evidentiary documents, underscore the rigorous scrutiny and diverse interests that must be reconciled in such projects. The emphasis on balancing water supply with protections for fish and water quality reflects a growing societal demand for sustainable development that minimizes ecological harm. This project also touches upon the broader political and economic landscape of California, where water rights and allocation are often contentious issues. The outcome of this decision will not only determine the future of the Sites Reservoir but also set precedents for how California approaches future water management strategies, potentially influencing policy and legal frameworks for water resource development and conservation across the U.S.
