California regulators on Thursday approved a contentious new framework that alters the governance of water pumping from the Sacramento-San Joaquin River Delta, a crucial hub in the state’s water system. The decision, made by the five-member State Water Resources Control Board, marks a departure from the traditional regulatory model that strictly limited water diversions to maintain minimum river and estuary flows.

Instead, the newly adopted plan offers water agencies the option to enter voluntary agreements in which they commit to sustaining certain environmental water flows and to funding habitat restoration projects in the Delta. Known as the Healthy Rivers and Landscapes program, the initiative received support from Governor Gavin Newsom and numerous water districts, agricultural interests, and business groups. These agencies have already begun investing in efforts to restore wetlands and floodplains along the region’s rivers.

“This is a paradigm shift,” said California Natural Resources Secretary Wade Crowfoot during the board’s hearing. He framed the plan as a balanced approach aimed at simultaneously protecting water security for communities while restoring environmental conditions.

The Metropolitan Water District of Southern California, which supplies water to nearly 19 million residents, also endorsed the plan. Nina Hawk, the district’s chief of Bay-Delta resources, described it as a significant advancement toward collaborative, science-based management of California’s water resources to benefit people, businesses, and wildlife.

However, the plan drew strong opposition from environmental groups, fishing advocates, and Native American leaders who warned that voluntary agreements would allow excessive water withdrawals from the Delta. Critics expressed concern that the approach threatens several already endangered species, including Chinook salmon, steelhead trout, green sturgeon, longfin smelt, and Delta smelt. Jon Rosenfield, science director for the nonprofit San Francisco Baykeeper, labeled the plan “an extinction plan,” while Barry Nelson of the Golden State Salmon Association called it “a scam.” Malissa Tayaba, vice chair of the Shingle Springs Band of Miwok Indians, told board members they were “on the wrong side of history.”

Despite a majority of public speakers opposing the plan, the board voted 4 to 1 in favor of adoption. Board Chair E. Joaquin Esquivel characterized the move as a “modernized regulatory approach” and a “generational shift” in Delta water management. Board member Nichole Morgan, who grew up fishing in the Delta, cast the lone dissenting vote.

The Delta water system supplies nearly 30 million people and irrigates roughly 4 million acres of farmland. Over recent decades, heavy reliance on its water has contributed to habitat degradation and declining fish populations, issues exacerbated by increasing drought and climate change. State officials emphasized that voluntary agreements will enable restoration of approximately 20,000 acres of floodplains and over 5,000 acres of tidal wetlands, funded in part by commitments totaling $2.9 billion from participating water agencies.

Not all water agencies have embraced the plan. The federal Bureau of Reclamation, which manages part of the state’s water infrastructure, criticized the proposal last month, arguing it would limit water deliveries to farmers and announced it would withhold involvement unless substantial changes were made. This stance threatens hundreds of millions of dollars in federal funding. Additionally, the Westlands Water District, the Central Valley’s largest irrigation authority, stated it intends to withdraw from the program, citing unmet terms in prior agreements with the state.

The revised Bay-Delta plan represents the most significant update since 1995 and is designed to take effect in 2025. It includes annual scientific reviews to assess progress and allows regulators to revert to traditional pumping restrictions if voluntary commitments are not met.

Environmental advocates have decried what they describe as opaque negotiations favoring powerful agricultural and water interests at the expense of native fish and ecosystem health. They pointed out that agriculture consumes roughly 80% of California’s diverted water, much of which supports crops exported globally.

While the board’s members are gubernatorial appointees confirmed by the state Senate, critics raised concerns about the administration’s transparency and meaningful involvement of Native tribes in decision-making. The plan includes provisions for a tribal advisory committee and acknowledges tribal water use, but some Native voices at the hearing argued their concerns remain marginalized.

Esquivel urged water agencies to honor their voluntary commitments, emphasizing the plan’s success will be measured by improvements to river health and the Delta estuary in the years to come.