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This study was conducted on the hydrochemistry of shallow groundwater and surface water in the Ndop plain, North West Cameroon. The objectives were to determine the physico-chemical characteristics of water, controls on water chemistry and suitability for drinking and irrigation. Forty-six shallow groundwater and 26 surface water samples were investigated. Field measurements of physical parameters were preceded by chemical analyses of the samples for major ions and F-. About 69% of the water sources had pH values below 6.5, classifying the water as barely acidic. Electrical conductivity ( Ca 2+ >Mg 2+ >K + for cations and HCO 3 - >>NO 3 -≥ Cl - >SO 4 2- for anions. Major ion concentrations were low, and within the WHO guidelines for drinking water, but F- concentrations were much lower (<0.39 mg/l) and below guideline value. Main water types and proportions were Na-HCO 3 (53 %), Ca-HCO 3 (35 %) and a mixed Na-Ca-HCO 3 (11%). Predominant processes influencing water chemistry were incongruent dissolution of silicate minerals and cation-exchange of Na+ in rocks for Ca 2+ in water. The low major ion concentrations indicated low water-rock interactions and short residence time. The analysed water was suitable for irrigation. Key words : Water chemistry, hydrochemical controls, drinking-irrigation quality, Ndop plain, Cameroon.

Hydrochemistry of shallow groundwater and surface water in the Ndop plain, North West Cameroon