In summary

To protect delicate water negotiations, Gov. Newsom breaks with Democrats, labor groups and environmentalists on anti-Trump legislation.

It had to happen sooner or later.

At some point, California’s “resistance” to President Donald Trump would move beyond flowery rhetoric, tweets and lawsuits and seriously affect Californians.

It happened in the wee hours of Saturday, just before the Legislature adjourned for the year. Lawmakers approved Senate Bill 1, the self-described California Environmental, Public Health and Workers Defense Act of 2019, and Gov. Gavin Newsom immediately signaled that he would veto it.

Carried by Senate President Pro Tem Toni Atkins, a San Diego Democrat, SB 1 would, if enacted, lodge in state law dozens of federal regulations that Trump’s administration had rolled back.

The most important, at least politically, have to do with water. Critics of the measure said that, purposely or not, the bill would sabotage years of very delicate negotiations aimed at bringing an end to California’s political and legal battles over the precious liquid.

Those negotiations revolve around the fate of the Sacramento-San Joaquin Delta, through which the state’s major rivers flow on their way to San Francisco Bay and the Pacific Ocean, and from which water is diverted to supply San Joaquin Valley farms and Southern Californians’ thirsts.

Environmental groups have sought enhanced flows through the Delta to preserve its role as an estuary important for the survival of fish and other species. But more water for the Delta’s wildlife inevitably means less water for human uses, especially agriculture, by far California’s biggest water user.

The battles have been fought in political arenas, both in California and Washington, and Trump has openly favored farmers, giving urgency to the drafting of so-called voluntary agreements that would reallocate water in ways acceptable to the dozens of contending interest groups.

The negotiations began under former Gov. Jerry Brown and have continued under successor Newsom, who would like nothing better than to announce an end to water wars.

Agricultural interests, with the support of U.S. Sen. Dianne Feinstein, a key player in the water negotiations, complained loudly that SB 1 would, by adopting pre-Trump rules regarding endangered species, undermine the peace talks.

Democratic legislators from rural areas, along with Republicans, backed their position. Newsom weighed in privately, seeking either changes in the bill or a postponement until next year.

Atkins appeared to be wavering, but at the last moment, she pushed the measure through both legislative houses.

It forced Newsom’s hand. He quickly declared that he supports the “principles behind Senate Bill 1: to defeat efforts by the President and Congress to undermine vital federal protections that protect clean air, clean water and endangered species.” He added, “Senate Bill 1 does not, however, provide the state with any new authority to push back against the Trump administration’s environmental policies and it limits the state’s ability to rely upon the best available science to protect our environment.”

By blocking SB 1, Newsom alienates some of his Democratic Party’s most important constituencies, the 41 environmental groups and labor unions listed as its supporters. But he placates an even greater number of business and agricultural groups that opposed it, including the California Chamber of Commerce, which had tagged the bill as a “job killer.”

 “SB 1 posed a major threat to California’s water supply and reliability, and the governor has shown outstanding leadership in announcing his veto of this measure,” the chamber said.

To neutralize the political fallout from his veto threat, Newsom must now deliver on a water agreement. Failure would be infinitely embarrassing.

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Dan Walters has been a journalist for more than 60 years, spending all but a few of those years working for California newspapers. He began his professional career in 1960, at age 16, at the Humboldt Times...