Ground-water resources of Island County with a section on quality of the ground water

The population of Island County has grown from 6,700 in 1940 to about 22,000 in 1964, causing a corresponding increase in the demand for water. Ground water is the only significant source of water within the county. Average annual precipitation ranges from less than 20 to more than 40 inches, and is the only recharge to the ground-water body.