Md. Code, State Fin. & Proc. § 17-209

(a) One time per year, the Commissioner shall determine the prevailing wage rate for a classification of worker in a locality by considering among other things: (1) any other payroll information relevant to the determination; and (2) wage rates established by collective bargaining agreements. (b) The Commissioner shall mail notice as provided in § 17-210(b)(2) of this subtitle at least 60 days before making a determination under this section. (c) (1) The determination, as issued under this section or modified in a proceeding under § 17-211 of this subtitle, is effective for 1 year from the date upon which the Commissioner issued the determination under this section. (2) The Commissioner shall show on the determination the date upon which it expires. (3) Upon expiration of the prevailing wage determination for a locality, the Commissioner shall issue a new determination for the locality. (4) A determination applies to a public work covered by this subtitle that is the subject of a call for bids or proposals published on or before the date upon which it expires.