The water sources in parts of the River Mamu sub-Basin, southeastern Nigeria were evaluated for domestic and agricultural purposes using hydrogeology and water quality. Thirty water samples from both surface water and groundwater were collected and analysed for hydrochemical and biological parameters. The average depth to aquifers and their thicknesses are 109.9 and 11.8m respectively. The concentration of the major ions, TDS and EC are within the WHO permissible guidelines for drinking water. Heavy metals concentration range in mg/L for Cd 2+ (0 -0.06), Cr 3+ (0 -0.19), Hg 2+ (0 -1.0), As 3+ (0 -0.14) and total Fe (0 -2.4) which in some of the samples exceed the permissible guideline values. The fecal coliform range in 100ml/L of samples (0 -36) exceeds the guideline values in some of the samples. The water is Ca-Mg -Cl-SO 4 type with the dominant ions as Ca 2+ and SO 4 2for both groundwater and surface water. The dominant geochemical processes are rockwater interaction in groundwater, which is a major contributor of dissolved ions and precipitation in the surface water. The WQI (17.84-301.99) connotes some samples are of very poor quality for domestic purposes. Irrigation indices depict most of the water as good to excellent for agriculture.
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