The Canadian Geotechnical Society-Southern Ontario Section (CGS-SOS) represents the national organization at the local level, covering Southern Ontario. The CGS-SOS was established in the early 1970s and forms the largest region of the Society. Its purpose is to provide opportunities for continuing education (through lectures and seminars), and for constructive dialogue and sharing of experiences. This is accomplished through organizing events on about a monthly basis.

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The Canadian Geotechnical Society (CGS) is an independent, federally incorporated, non-profit learned society which exists to serve and promote the geotechnical and geoscience community in Canada. It encompasses a wide spectrum of scientific and engineering disciplines within the geotechnical field. Membership is open to individuals from all sectors including private consulting, universities, industry, contracting and public services.