This advanced water tool is probably more useful for researchers, students and consultants. It provides you with information on the quality of groundwater and river sites in South Africa. Some of the data date back to the early 1950's. You will need Google Earth to open the files - some of the file are quite large so it can take some time to load depending on your internet connection.

More information on the tool and how to use it can be found at the link below:

Water Quality Data Exploration Tool