Branded “the poster child of all things bad in water” by one almond grower, the popular crop consumes more water than all the showering, dish washing and other indoor household water use of California’s 39 million people.

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SAN FRANCISCO — California almonds are becoming one of the world’s favorite snacks and creating a multibillion-dollar bonanza for agricultural investors. But the crop extracts a staggering price from the land, consuming more water than all the showering, dish washing and other indoor household water use of California’s 39 million people.

As California enters its fourth year of drought and imposes the first mandatory statewide water cutbacks on cities and towns, the $6.5 billion almond crop is helping drive a sharp debate about water use, agricultural interests and how both affect the state’s giant economy.

Almonds have claimed the spotlight as “the poster child of all things bad in water,” almond grower Bob Weimer said.

People around the world are eating over 1,000 percent more California almonds than they did just a decade ago, and last year almonds became the top export crop in the nation’s top agriculture state. China’s booming middle class is driving much of the demand.

That strong Asia market is producing up to 30 percent returns for investors, prompting agribusinesses to expand almond planting in the state by two-thirds in the past decade. The crop has come to be dominated by global corporations and investment funds.

Rows of almond trees now cover nearly 1 million acres in California, many of them on previously virgin hillsides or in pastures or desert with little rain or local water. Since each tiny nut requires a gallon of water, almonds are consuming 1.07 trillion gallons annually in the state, one-fifth more than California families use indoors.

So when Gov. Jerry Brown ordered cities and towns this month to cut their water consumption by 25 percent but exempted farms, almonds got toasted in the public heat that followed.

“Drought villains?” the Los Angeles Times asked this month. A Sacramento TV station referred to “almond-shaming.” National Public Radio called almond farms “a rogue’s gallery” of water users.

Now almond farmers and investors are on the defensive.

“The tomato growers use a lot more water than we do. You should go after those guys,” said Ryon Paton, a global real-estate developer and principal of Trinitas Partners.

Paton’s online literature tells investors to think of his newly planted almond orchards in Stanislaus County as “the classic Silicon Valley startup, except we have nothing to do with technology.”

He regularly has to deny rumors — including from fellow almond farmers — that celebrities such as Oprah Winfrey and Condoleezza Rice are among the investors drawn to his almond fund.

California growers provide 80 percent of the global supply of almonds. In China, where the number of middle-class households has doubled since 2006, consumers see almonds as a healthy snack and regard American food in general as less contaminated than products from elsewhere.

Almonds aren’t even the biggest sponges when it comes to water-thirsty crops in semi-arid California — that would be the state’s million acres of alfalfa, which go to feed livestock.

Unlike the row crops they’re displacing, the new almond trees require water year round.

The big almond growers “are saying you’ve got to deliver us water. We don’t care about this. We don’t care about that,” said Weimer, the Merced County grower of almonds and other crops. His wells have gone from 40 feet deep in 1977 to 90 or 100 feet this year, as farmers and other users draw from the underground reservoirs.

“We’ve crossed an interesting boundary here,” Weimer said.

Continuing strong prices have some California growers rushing to plant still more trees. In a U.S. Department of Agriculture survey for 2014, 77 percent of state almond farmers polled said they intended to put in new almond acreage despite the drought.

The governor and his Cabinet secretaries defend almonds as a high-value crop.

“We’re going to try to maximize all beneficial uses, not pick one we like better than the others,” said Felicia Marcus, head of the state Water Resources Control Board.

Any talk of curbing almond growing by big investment firms “really just gets to be kind of un-American,” said Paul Wenger, head of the state Farm Bureau. Even though he dislikes some almond investors, Wenger said, “It’s a free country. And they have a right to do whatever they can.”