The Association of Professional Geoscientists of Ontario (APGO) was established by the Professional Geoscientists Act, 2000. This legislation protects the public and investors by establishing a regulated association of geoscientists with the power to admit only qualified persons. Moreover, it encourages continuing professional competence, disciplines members for professional misconduct, and prevents unqualified individuals from practicing.

Graduates of any of the 20 credit single major programs offered through the Department of Earth Sciences may apply for membership in the Association of Professional Geoscientists of Ontario (APGO), allowing for the use of the designation P.Geo. (Professional Geoscientist). Students interested in pursuing a career as a professional earth scientist in Canada should consult the knowledge requirements for the APGO available on their website.