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Time's Up on Groundwater Plans: One of the Most Important New California Water Laws in 50 Years Explained

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Photo of man drawing a water sample in Stockton, CA
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Much of California’s water supply is a hidden asset: Deep below the surface, rocks, gravel and sand store water like a sponge, in an underground zone called an aquifer.
In dry years, this groundwater has been tapped to save farms, keep grass green and provide drinking water to millions of Californians. But over time, people have taken more water out than nature has put back in. Estimates vary, but according to the U.S. Geological Survey, California pumped 41 trillion gallons of water fom the ground in about 100 years, through 2013. In some parts of the Central Valley, that means land has been dropping around a foot a year.
The landmark Sustainable Groundwater Management Act, or SGMA, requires some of the state’s thirstiest areas form local “Groundwater Sustainability Agencies” and submit long-term plans by Jan. 31 for keeping aquifers healthy. Together, those plans will add up to a big reveal, as groundwater managers finally disclose how badly they believe their aquifers are overdrawn, and a collective picture emerges. It’s a major shift and arguably the most important new California water law in 50 years.
Here are some key things to know about the groundwater situation in California and how the law will impact the state.
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