The OMB was constituted under the "Ontario Municipal Board Act", which conferred "exclusive jurisdiction in all cases and in respect of all matters in which jurisdiction is conferred on it by this Act or by any other general or special Act." Until 2009, its decisions could be appealed by petition to the Lieutenant-Governor in Council, but such petitions were abolished by the "Good Government Act, 2009", after which decisions of the OMB were final, subject only to appeals to the Divisional Court on a question of law with that Court's leave.