The Department shall issue a written complaint if the Department has reasonable grounds to believe that the person to whom the complaint is directed has violated: This subtitle; Any rule or regulation adopted under this subtitle; or Any order, permit, or certificate issued by the Department under this subtitle. A complaint issued under this section shall: Specify the provision that allegedly has been violated; and State the alleged facts that constitute the violation. After or concurrently with service of a complaint under this subtitle, the Department may: Issue an order that requires the person to whom it is directed to take corrective action within a time set in the order; Send a written notice that requires the person to whom it is directed to file a written report about the alleged violation; or Send a written notice that requires the person to whom the notice is directed: To appear at a hearing held in accordance with the Administrative Procedure Act before the Department at a time and place the Department sets to answer the allegations of a complaint; or To file a written report and also appear at a hearing held in accordance with the Administrative Procedure Act before the Department at a time and place the Department sets to answer the charges in the complaint. Any order issued under this section is effective immediately, according to its terms, when it is served.