Md. Code, Pub. Util. § 23-101

(a) The Commission shall develop surveys, plans, specifications, and estimates for water supply and sanitary sewer systems in the portions of the sanitary district that the Commission considers necessary. (b) The Commission shall divide the sanitary district into water or sanitary sewer districts that in the Commission’s judgment: (1) best serve the needs of the communities in the sanitary district; and (2) promote the convenience and economy of the installation and operation of water supply and sanitary sewer systems. (c) The Commission may proceed with construction that the Commission considers advisable in any district. (d) If the Commission initiates construction without petition or request from an interested party, the Commission may give reasonable notice that the Commission considers advisable. (e) (1) The Commission may extend its water supply or sewer systems into any area outside of the sanitary district that is contiguous to or in the vicinity of the sanitary district if the property owners of the area agree to the conditions imposed by the Commission. (2) Except as provided in this division, the powers and authority in this subsection may not be restricted by any other general, special, or local law. (f) The Commission may not install, operate, or exercise any authority over stormwater management in Montgomery County.