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Summary
A physioecological study of the Umsindusi River at Pietermaritzburg was carried out to estimate the changes in composition taking place during its passage through the city. While little evidence of gross industrial pollution was found, there was a marked enrichment of many constituents, particularly organic substances. A number of sources contribute to the pollution of the Umsindusi, and while this pollution is at present within the self-purification capacity of the river, recovery is slow, and the chemical and bacteriological quality of the water leaving Pietermaritzburg is poor.