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Fact Sheet

Groundwater in California

By Kyle Greenspan, Spencer Cole, Caitlin Peterson

Groundwater is a vital, but threatened, component of California’s water supply. Learn more about this important resource!

Report

Replenishing Groundwater in the San Joaquin Valley: 2024 Update

By Caitlin Peterson, Ellen Hanak, Zaira Joaquín Morales

How much progress has been made on groundwater recharge in the San Joaquin Valley since 2017? This report shares the details of our latest groundwater recharge survey, which we conducted in 2023.

blog post

Making Sense of the Floods in San Diego

By Sarah Bardeen

The sudden deluge in San Diego last week has left some of that city’s communities reeling. But what actually caused the epic flooding—and could it have been avoided? We ask the experts.

Report

Priorities for California’s Water

By Jeffrey Mount, Letitia Grenier, Ellen Hanak, Caitlin Peterson ...

California has made great strides in preparing for a drier, hotter future, but it remains a challenge to harness the bounty of wet years while also reducing flood risk. How did California’s water sector manage the unusually wet 2023 water year—and what lessons can we glean for the future?

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