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You will need to check local standards, of which there are likely to multitudes I am afraid. For sanitation programmes to be successful they need to be designed with the specific needs of users in mind, hence your search for a universal standard is likely to cast you as Perceval in the search for the holy grail. There is the added complication that South Africa has recently adopted the CLTS approach to community sanitation, so there are likely to numerous models of ‘appropriate technology sanitation in use, and there is unlikely to be a single authority with a mandate to impose sanitation standards.
The Sustainable Sanitation Alliance is likely to be your best starting point, their South Africa page is avaialable at https://www.susana.org/en/search?searchword=south+africa . You should also check out the standards for institutional sanitation set by the relevant ministries; The Ministry of Health will have published standards for health centres and the Ministry of education will have standards for schools.
I am sorry I cannot be more specific, but it has been a few years since I worked in Southern Africa.