Maryland Code, Public Utilities § 24-103

(a)(1) A person shall obtain a permit from the Commission before the person may make a hookup with a water or sewer service line that the Commission constructs or maintains.

(2) A hookup shall be made under the conditions that the Commission authorizes.

(1) at a reasonable time, enter a building or premises that has a connection with the water supply or sewer system under the jurisdiction of the Commission; and

(2) issue an order requiring a change in the plumbing, waterworks, or water or sewer connection that the Commission considers necessary.