Md. Code, Public Utilities § 25–501

(a) The Commission shall set a service rate that the Commission considers necessary to provide funds for:

(1) maintaining, repairing, and operating its water supply and sewer systems, including the overhead expense and depreciation allowance; and

(2) making any payments to the District of Columbia, as specified in this title.

(b) The service rate:

(1) shall be chargeable against all properties for a connection with any line owned by the Commission;

(2) shall be uniform throughout the sanitary district; and

(3) may be changed as necessary.