When a supplier of water provides water to one or more other public water systems, the Approving Authority may modify the monitoring requirements imposed by Regulations .11-----.15-3 of this chapter, to the extent that the interconnection of the systems justifies treating them as a single system for monitoring purposes. Any modified monitoring shall be conducted pursuant to a schedule specified by the Approving Authority.
Md. Code Regs. 26.04.01.18