Maryland Environment Section 2-603
§ 2-603.
  (a)   A show cause order issued under this subtitle shall:
    (1)   Specify the provision that allegedly has been violated;
    (2)   Describe the nature and extent of the alleged violation;
    (3)   Require the person charged to appear at a hearing and show cause why an order requiring corrective action should not be issued; and
    (4)   State the date, time, and place of the hearing.
  (b)   Each show cause order issued under this subtitle shall be in writing and shall be served:
    (1)   Not less than 20 days before the time set for the hearing; and
    (2)   As a summons is served under the Maryland Rules or by certified mail.