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Hydro-geochemical survey was undertaken in parts of Imo River Basin, Southeastern Nigeria, particularly in the geologic formation of Ogwashi-Asaba, to assess the quality of groundwater. Sixteen samples of groundwater were obtained from various boreholes in the study area and subjected to physico-chemical analysis using standard laboratory techniques. The study was aimed at the assessment of the groundwater quality indicators namely: pH, electrical conductivity (N), phosphate (PO4), sulphate (SO4), nitrate (NO3--) and total dissolved solids (TDS). The result shows low pH values in the following areas: Amapu Ntigha (BH5), Ubakala-Umuahia (BH6), Ife-Ezinihitte Mbaise (BH30), Nkwogwu-AbohMbaise (BH31), Uratta-Owerri (BH34) and Oboame-Aboh Mbaise (BH45). Their pH values are below the acceptable range of 6.5-8.5, which indicates acidity. The acidity probably results from carbonic acid derived from the solution of CO2 from both the atmosphere and the decomposition of plant materials in the soil zone. The acidity of the groundwater gives slight sour taste to drinking water, due to the mobilization of trace metals from the aquifer material into the groundwater system, because of the corrosive effect of acidic water. Since borehole supply is rarely treated, these trace metals end up in domestic supplies resulting in health implications and complaints. Acidic waters are typically low in buffering calcium minerals, but are high in dissolved carbon dioxide gas, which can cause the low pH or acidity. Calcite neutralizer tanks with natural crushed and screened pure calcium carbonate easily neutralize acidic water from 6.0 to 6.9. Below 6.0 a blend of calcite and Corosex is recommended. Common systems used to treat low pH include Calcite Neutralizer, calcite & Corosex Blend Neutralizer, pflow Neutrilizer, Soda Ash Feed Pump Injection System.

Groundwater Quality Assessment of Parts of Ogwashi-Asaba Formation in Imo River Basin, Southeastern Nigeria.