Maryland Code, Public Utilities § 23-314

(1) may not extend or approve construction of a sewer of any size or capacity to serve property in either county beyond the area that has been approved for service in a Program and the 10-year water and sewer plan required under § 9-503 of the Environment Article; or

(2) subject to subsection (b) of this section, may not extend a water line of any size or capacity beyond the approved terminal point of a major project.

(1) the extension of the water line would provide water service to a development that is within an approved sewer project area; or

(2) the affected county, through an appropriate county unit, has approved the installation of individual sewage disposal facilities.

(1) the proposed extension has been submitted for approval; and

(2) within 30 days after receipt of the proposed extension, the affected county has not notified the Commission that the extension should not be made.