Agriculture has both direct and indirect effects on the quality of surface water and groundwater and is among
the leading causes of water quality degradation, mainly as a result of the excessive use of agrochemicals.
Water samples were collected in a selected catchment area (Bonsma Dam) in KwaZulu-Natal and analysed
for physicochemical variables. The concentrations of most of the elements and total dissolved solids, as well
as the pH and electrical conductivity values, met the water quality requirements for domestic, agricultural,
livestock and aquatic ecosystem uses. However, the inlet streams feeding the dam were found to be eutrophic
during the wet season. Analysis of nitrate in the water body of the study area indicated that agricultural
applications of manure and fertilisers may be a potential source of nitrate contamination. Most elements
were more concentrated in the dam during the wet season. The overall ionic conductivity values were also
higher in the wet season, while the pH was lower. The outcome of this work links the concentrations of
physicochemical variables to land use, agricultural practice and local geomorphology. Seasonal patterns
in the concentration of physicochemical variables occur, as land use, rainfall and farming activities change
seasonally, and these concentrations should therefore be determined periodically.