Recharge occurs when water seeps into the ground to replenish underground aquifers. Although some recharge happens incidentally—water flowing into the ground from rivers, unlined canals, or excess irrigation—intentional recharge can restore groundwater levels and store water for later use.
In coastal areas, intentional recharge prevents salty ocean water from entering freshwater aquifers. Recharge can also help prevent impacts from groundwater pumping, such as dry wells or sinking lands, while providing wetland habitat for birds, reducing flood risk, and storing water for droughts.
Active recharge is a longstanding practice in much of urban Southern California and parts of the Bay Area, Central Coast, and Central Valley.

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