USGS Washington Water Science Center
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Island County consists of two major islands, Whidbey and Camano, and lies in northern Puget Sound, north of Seattle. Whidbey Island has an area of about 165 square miles and Camano Island an area of about 45 square miles, for a total area of about 210 square miles. Ground water is the primary source of water on the islands, and the ground-water system is fairly well understood, due in part to studies of Island County conducted in the 1980s by the U.S. Geological Survey and others. However, some questions still remain about the ground-water system of Island County, especially the quantity of recharge reaching the ground-water system from precipitation.