There is hereby established a wellhead protection overlay zone identified and described as all the area shown on the Filer city and area of impact zoning map. It is further established that these areas be composed of four (4) subzones: "wellhead protection overlay zone A", "wellhead protection overlay zone B", "wellhead protection overlay zone C", and "wellhead protection overlay zone D", as they are defined herein. (Ord. 527, 8-6-2002)