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The Bay Area imports most of its water and relies on the Sacramento-San Joaquin River Delta and its tributaries for about 70 percent of its supply. Those supplies face an uncertain future as a changing climate shrinks the Sierra snowpack and raises sea levels, and a declining ecosystem results in further restrictions — all while the Bay Area’s population and economy continue to grow. The stark reality is that 25 million people and 3 million acres of farmland are at risk of losing up to 20 percent of their future water supplies if the status quo continues in the delta.

California’s biggest water project in decades appears to be in limbo after a key irrigation district voted not to help underwrite Gov. Jerry Brown’s plan to build two giant tunnels that would re-engineer water transport in the state. The no-vote at the Fresno-based Westlands Water District — the largest agricultural water supplier in the U.S. — puts the $17 billion project’s funding on shaky ground. Will other water districts pick up the slack? Other large water agencies considering participating in the project are set to vote soon. Another key player, Los Angeles’ Metropolitan Water District, will vote on October 10.

It was a year of plenty for parched California. State figures released at the end of the water year, which resets each Oct. 1, tell the story: The northern Sierra Nevada had its wettest year, 95 inches of precipitation, since record-keeping began in 1895. IN the central Sierra, it was the wettest in more than three decades. The rain at times overwhelmed the state’s water infrastructure, terrifyingly so in Orville.

The water year that ended Saturday was the wettest on record for the watersheds feeding the Tuolumne and Stanislaus rivers. The Merced River fell just short. The Tuolumne had about 4.86 million acre-feet of runoff from rain and snowmelt from last October through September, the Turlock Irrigation District reported. That beat the previous high of 4.64 million in 1983 and was 255 percent of the historical average, spokesman Brandon McMillan said.

Water is the Central Valley’s economic lifeblood — of that, there is no doubt. The drought of the last five years has put tremendous pressure on the state’s water allocation systems and shown that they are not only broken but incapable of adapting to the realities of a sustained drought cycle. But, why should people in Southern California and Orange County care if water is not available to the Central Valley and agricultural production goes away?