All proposed major subdivisions except as provided in Subsection 16-5.16d below shall be connected by the applicant, at the applicant's sole expense, to an existing public water supply system if public water is available within the following distances: 200 feet for one unit developments, 400 feet for two unit developments, 600 feet for three unit developments, 800 feet for four unit developments, 1,000 feet for five unit developments, 1,200 feet for six unit developments, 1,400 feet for seven unit developments, 1,600 feet for eight unit developments, 1,800 feet for nine unit developments, 2,000 feet for 10 unit developments, 2,200 feet for 11 unit developments, 2,400 feet for 12 unit developments, 2,600 feet for 13 unit developments, 2,800 feet for 14 unit developments, and 3,000 feet for 15 unit developments. For developments of greater than 15 units which are within one mile from an existing public water supply system the applicant shall provide public water or adequate justification shall be given by the applicant to the Board as to the reason it should not provide a connection to the existing public water supply system. The system shall be installed in accordance with the standards imposed by the public water utility. The system proposed in lieu of connection to public water shall be capable of providing adequate water for fire fighting purposes. For purposes of this paragraph, adequate justification shall mean a hardship generated by peculiar physical qualities of the property to be developed, including but not limited to, topographical, geological, hydrological or other similar compelling reasons concerning the physical condition of the property.