DWR: California's groundwater storage increases for the first time since 2019
California's groundwater storage has increased for the first time since 2019.
According to data released by the Department of Water Resources, groundwater aquifer storage increased by 8.7 million acre-feet following 2023's huge rain and snow season.
About 4.1 million acre-feet of that increase came from managed aquifer recharge programs, where excess surface water is intentionally pumped underground. For comparison, Lake Shasta has a total capacity of about 4.5 million acre-feet.
DWR credits an abundant surface water supply and more carefully managed groundwater use for last year's growth.
California's massive underground aquifers can be considered as an emergency savings account for the state's water needs. Following dry winters when reservoirs are low, groundwater can be pumped to the surface to meet demand.
Historically, the state's groundwater storage has been severely over drafted. The Sustainable Groundwater Management Act, signed into law ten years ago, aims to reduce over pumping in the future while simultaneously restoring the aquifers.
While this update holds promise for the future of managing groundwater, DWR says it also illustrates just how much further there is to go.
The agency estimates that there is a 40 million acre feet groundwater deficit that has built up over the past two decades. Five consecutive above average rain and snow seasons would be needed to make up that deficit.