Hydro-geochemical survey is undertaken in parts of Imo River Basin, Southeastern Nigeria, particularly in the geologic formations of Imo Shale and Ameki, to assess the quality of groundwater. Eleven samples of groundwater are obtained from various boreholes in the study area and subjected to physico-chemical analysis using standard laboratory techniques. The study is 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 that the water from boreholes in Umuahia has low pH, and is therefore acidic. The pH values range between 4.40 and 5.60, which is below the acceptable range of 6.5-8.5. 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: Calcite Neutralizer, calcite & Corosex Blend Neutralizer, pflow Neutralizer, Soda Ash Feed Pump Injection System.
 A. S. T. Wadie and G. A. S. Abuljalil, “Assessment of Hydrochemical Quality of Groundwater under Some Urban Areas with Sana’a Secretariat,” Eclética Química, Vol. 35, No. 1, 2010, pp. 77-84.doi:10.1590/S0100-46702010000100009
 C. R. Ramakrishnaiah, C. Sadashivaiah and G. Ranganna, “Assessment of Water Quality Index for the Groundwater in Tumkur Taluk, Karnataka State, India,” E-Journal of Chemistry, Vol. 6, No. 2, 2009, pp. 523-530.doi:10.1155/2009/757424
 P. R. Sarukkalige, “Impact of Land Use on Groundwater Quality in Western Australia. Improving Integrated Surface and Groundwater Resources Management in a Vulnerable and Changing World,” Proceedings of Joint International Association of Hydrological Scientists (IAHS) and International Association of Hydrogeologists (IAH) Convention, Hyderabad, 6-12 September 2009, pp. 136-142.
 E. I. Okoro, B. C. E. Egboka, O. L. Anike and A. G. Onwuemesi, “Integrated Water Resources Management of the Idemili River and Odo River Drainage Basins, Nigeria: Improving Integrated Surface and Groundwater Resources Management in a Vulnerable and Changing World,” Proceedings of Joint International Association of Hydrological Scientists (IAHS) and International Association of Hydrogeologists (IAH) Convention, Hyderabad, 6-12 September 2009, pp. 117-122.
 H. Hultberg and A. Wenbald, “Acid Groundwaters in Southwestern Sweden,” In: D. Drablos and A. Tollan, Eds., International Conference on Ecological Impact of Acid Precipitation, Sandefjord, 11-14 March 1980, pp. 220-221.
 C. A. J. Appelo, G. J. W. Krajenbrank, C. C. D. F. van Ree and L. Vasak, “Controls on Groundwater Quality in the NW Veluwe Catchment,” Soil Protection Series 11, Staatsuitgeveriji, Den hag, 1982, p. 140.
 A. Grivall, C. S. Cole, B. Allard and P. Sanden, “Quality Trends of Public Water Supplies in Sweden. Acid Precipitation and Human Health-Part 1,” Water Quality Bulletin, Vol. 11, No. 1, 1986, pp. 6-11.
 P. L. Smedley, W. M. Ednunds, J. M. West, S. J. Gardner and K. B. Pelig-Ba, “Vulnerability of Shallow Groundwater Quality Due to Natural Geochemical Environment. Health problems Related to Groundwater in the Obuasi and Bologatanga Areas, Ghana,” Report Prepared for ODA under ODA/BGS Technology Development and Research Programme, Project 92/1995.
 Clean Water Systems and Stores. http://www.cleanwaterstore.com/how-to-acid-water.html