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The DeKalb County Department of Watershed Management is participating in a Source Water Assessment with the Atlanta Regional Commission (ARC). This assessment is required by the United States Environmental Protection Agency (USEPA) and is conducted under the guidance of the Georgia Environmental Protection Department.

A Source Water Assessment is a study and report that provides basic information about the water body that is used as drinking water in each water system. The source water for DeKalb's drinking water supply is the Chattahoochee River. This Source Water Assessment looks at potential sources of pollution upstream from the water intake on the river and rates the possibility for pollution to enter the river.