Sépaq's mandate is to manage and develop public territories and the tourism facilities entrusted to it by virtue of its incorporating Act. Its mission is to make sure its establishments are accessible to the public, and to develop and protect these public facilities for the benefit of its clientele, the regions of Québec, and future generations.

This mission is combined with an active commitment to contribute to the regions in which the establishments are located, through promoting economic development and encouraging partnerships, particularly with private businesses that offer activities and services.