Groundwater deep beneath L.A. area slow to recharge, study finds

A new study by Stanford University scientists analyzed the impact of historic 2023 rainstorms on groundwater levels in Southern California, revealing that deep aquifers did not fully recover from decades of depletion caused by pumping. Despite the storms filling reservoirs, only 25% of the water lost to pumping since 2006 was replenished in aquifers more than 150 feet underground. The study, published in Science, emphasized the need for sustained wet years to restore deep aquifers and highlighted the importance of data from seismic monitoring networks for informing water management decisions and groundwater replenishment efforts.

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