The Department may issue variances and exemptions from the requirements of these primary drinking water regulations under conditions and in a manner which are not less stringent than the conditions under which, and the manner in which, variances and exemptions may be granted under the Federal Safe Drinking Water Act. This regulation shall apply to each public water system, unless the public water system meets all of the following conditions:
S.C. Code Regs. § 61-58.9.A