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California Gov. Jerry Brown (D) imposed new regulations on the state’s fast-growing fracking industry last week, but dozens of elite chefs are still calling for a complete moratorium on the practice. Led by organic food pioneer Alice Waters, California’s top chefs and food experts are circulating a petition to pressure the governor. By the end of the first day, 92 chefs, restaurant owners, winemakers and authors had signed the petition.

Waters, the founder of Berkeley’s Chez Panisse restaurant, and other foodie icons are protesting specifically against fracking’s impacts on farming and food. The Central Valley, which produces one quarter of the nation’s food and 40 percent of American fruits, nuts and other produce, will also now be subjected to new, intensive fracking operations to get at its deep veins of Monterey shale. Energy companies have zeroed in on an estimated 15 billion barrels of shale oil lie beneath the Central Valley farmland and in southern California.

However, fracking requires an enormous amount of water, which is already scarce after a series of punishing droughts. The Central Valley aquifer, a major groundwater resource for farms, is shrinking at a rapid clip. Exacerbating an already fierce regional water war, energy companies are now buying up as much water as they can, outbidding farmers by a 3 to 1 margin.

Groundwater contamination is also a major concern for farmers. Leakage from one fracking operation in Kern County killed a swath of almond and pistachio trees, costing the farmer who cultivated them millions of dollars. Other farmers report chloride contamination in their wells and poisoned livestock.

Waters expresses these concerns in her petition. “In states already experiencing rampant fracking operations, leaks and spills have damaged crops, killed livestock and sickened the people near drilling operations, which are commonly found in agricultural communities that grow our food,” she warns. “As chefs, restaurateurs and eaters who cherish and rely on the natural bounty cultivated and cared for by our state’s farmers, ranchers and food producers, we cannot stand by and allow the same fate to befall California’s unparalleled food shed.”