California Relaxed Sites Reservoir Water Diversion Rules
The policy shift lowers barriers for the $6.2 billion project, impacting future water availability for regional businesses.
Updated on Sept. 18, 2026 in Construction
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The State Water Resources Control Board has eased diversion requirements for the proposed 1.5 million acre-foot Sites Reservoir in Glenn and Colusa counties. The move improves the financial viability of the project, which aims to support 3 million households annually.
Why it matters
The change addresses long-term resource concerns, as the project was previously stalled by stringent river-flow mandates. Reducing these constraints is intended to keep the multi-billion dollar construction effort cost-effective for participating agencies.
The reservoir is estimated to cost between $6.2 billion and $6.8 billion, with $1.36 billion secured through voter-approved state bonds. These new diversion terms replace a former requirement that mandated river flows reach 55% of natural levels before collection.
The players
State Water Resources Control Board
The agency responsible for managing water rights and quality standards that govern agricultural and commercial usage.
Gavin Newsom
The Governor of California who has prioritized the development of new water storage infrastructure to address state shortages.
Sites Project Authority
The administrative entity overseeing the development and financing of the proposed reservoir infrastructure.
The details
The facility functions by capturing water during high-flow wet periods and storing it for release through a pipeline during drier months. By relaxing the 55% flow requirement and extending the diversion window, the Board has provided developers with more operational flexibility. This adjustment follows direct pressure from Governor Gavin Newsom, who identified the project as a critical component for addressing persistent water shortages.
Timeline
The State Water Board relaxed the reservoir's water right conditions two weeks ago.
The Sites Project Authority declared the project viable on September 18, 2026.
The State Water Board will hold a final vote on the water right on November 4, 2026.
Developers target 2027 as the year to begin construction.
The project is expected to reach completion by 2034.
Market Landscape
This project highlights a significant evolution in California water infrastructure, signaling a move toward decentralized storage over centralized projects like the California WaterFix. The shift indicates that state regulators are prioritizing regional capacity to mitigate the volatility of drought cycles.
Operators in sectors dependent on reliable water supply should monitor the upcoming November 4 board vote as a bellwether for regional utility costs. Businesses should review long-term water contracts and local utility planning documents to assess how the project's construction timeline may impact future rate structures.
The takeaway
The Sites Reservoir project is moving forward, providing a long-term potential remedy for California's water scarcity. Operators should track the November 2026 regulatory vote as a key indicator for future utility infrastructure investment and regional resource security.
What happens next
The State Water Board will hold its final vote on the reservoir's water rights on November 4, 2026.
Further reading
For broader trends in large-scale infrastructure, see our analysis on Construction.
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