A new lawsuit has been filed challenging California’s water management practices in the Sacramento-San Joaquin River Delta, a critical region where the state’s largest rivers converge. The case alleges that the state’s extensive water pumping is excessive and harmful to the Delta’s ecosystem, native fish populations, and local agricultural communities.
The environmental organization California Water Impact Network, along with the Central Delta Water Agency, filed the lawsuit Friday in Alameda County Superior Court. The groups argue that the state Department of Water Resources is withdrawing an unsustainable volume of water from the Delta, thereby endangering fish species such as Chinook salmon, steelhead trout, smelt, and sturgeon, all of which have seen significant declines in recent decades. They also contend that the water extraction contributes to toxic algae blooms that threaten public health and degrade the environment.
Carolee Krieger, executive director of the California Water Impact Network, said the lawsuit seeks to cut water pumping from the Delta by half in order to preserve the ecosystem. The Central Delta Water Agency, representing hundreds of local farmers, expressed concern that excessive pumping draws seawater further into the estuary, salinizing irrigation supplies and damaging crops.
The plaintiffs assert that the Department of Water Resources’ operations violate both the California Constitution and the public trust doctrine, which requires preservation of natural resources for public use. They are requesting judicial oversight to limit water exports and to compel the state to develop a sustainable long-term water management plan subject to court supervision.
The State Water Project, one of the largest water delivery systems globally, transports water more than 700 miles from Northern to Southern California through a vast network of reservoirs, aqueducts, and pumping stations. Approximately 56% of this water serves urban areas, while 44% supports agricultural production.
The lawsuit also criticizes a trend toward planting permanent, water-intensive crops like almonds and pistachios in the San Joaquin Valley, which the plaintiffs say exacerbates water scarcity by creating an inflexible agricultural system less capable of responding to drought conditions.
The Newsom administration has defended its water management strategy, emphasizing efforts to balance ecosystem protection with water deliveries to farms and cities. In 2024, state officials collaborated with the federal government to establish new operational rules designed to protect endangered fish and maintain water reliability. The state also advocates for the construction of a 45-mile tunnel, known as the Delta Conveyance Project, to transport water beneath the Delta as a climate adaptation measure.
Both plaintiffs have separate legal challenges pending against the administration’s tunnel project, and the Department of Water Resources declined to comment on the current lawsuit.
Legal experts have described the suit as a significant challenge to the State Water Project. Dave Owen, a professor at UC Law San Francisco, called it “a frontal assault” on California’s primary water delivery system, underscoring the high stakes and expecting the state to mount an aggressive defense. State lawyers are likely to argue that the dispute rests on political objections to water allocation rather than legal violations.
The lawsuit highlights longstanding tensions between environmental conservation, agricultural interests, and urban water demands in California’s complex water management landscape amid increasing pressures from climate change.