The Department may issue a show–cause order or a corrective order under this section if the Department has reasonable grounds to believe that the person to whom the order is directed has violated: This title; Any rule or regulation adopted under this title; Any plan for compliance issued under this title; or Any permit or registration issued under § 2–401 of this title. The Department is not required to issue a show–cause order or a corrective order before enforcing this title by injunction or civil penalty under this subtitle.