Middle Canyon, Santa Catalina Island

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Middle Canyon, Santa Catalina Island is the source of much of Avalon's water supply. All of Avalon’s drinkable water comes from three shallow (less than 100 foot deep) wells in Middle Canyon, or the ocean via the desalination plant. These wells draw water from a thick layer of deposited soil (called alluvium) in the area of Middle Canyon around Thompson Reservoir. This underground water source is often called the "alluvial aquifer” and the wells “alluvial ground water wells.” Contrary to popular belief, water is not pumped from Thompson Reservoir. Instead, the reservoir is used to store surface water that then helps recharge (replace) the groundwater in the aquifer.