For the purposes of this subchapter, a wellhead protection overlay district shall only be established where a direct relationship exists between the overlay district and a well or spring serving a public water system which serves ten (10) or more connections or twenty five (25) or more of the same persons for at least six (6) months of the year, whether such public water system is publicly or privately owned or operated. (Ord. 501, 11-18-2008)