California farms grow about a quarter of U.S. food, and that takes a lot of water. Many farmers rely on water pumped from the ground. But over time, pumping is depleting the aquifers. And severe droughts are making the problem worse.

“Eventually, you’re going to run out of water,” says Don Cameron, vice president and general manager of Terranova Ranch in California’s Central Valley.

To help protect the ranch, he’s been working for years to replenish groundwater supplies.