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.
Cite this paper
I. Ijeh and I. Udoinyang, "Assessment of the Groundwater Quality in Parts of Imo River Basin, Southeastern Nigeria: The Case of Imo Shale and Ameki Formations," Journal of Water Resource and Protection
, Vol. 5 No. 7, 2013, pp. 715-722. doi: 10.4236/jwarp.2013.57072
 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.
 C. Tay and B. Kortatsi, “Groundwater Quality Studies: A Case Study of the Densu Basin, Ghana,” West African Journal of Applied Ecology, Vol. 12, No. 1, 2008.
 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.
 B. K. Kortatsi, “Acidification of Groundwater and Its Implications on Rural Water Supply in the Ankobra Basin, Ghana,” West African Journal of Applied Ecology, Vol. 4, No. 1, 2003, pp. 35-47.
 A. M. J. Swardt and O. P. Casey, “The Coal Resources of Nigeria,” Geological Survey Nigerian, Bulletin No. 28, 1961.
 K. O. Uma, “Analysis of Transmissivity and Hydraulic Conductivity of Sandy Aquifers of the Imo River Basin,” Unpublished Ph.D. Thesis, University of Nigeria, Nsukka, 1986.
 R. A. Reyment, “Aspects of the Geology of Nigeria,” University of Ibadan Press, Ibadan, 1965.
 A. Whiteman, “Nigeria: Its Petroleum Geology Resources and Potentials,” Vol. 2, Graham and Trotman Publishers, London, 1982.
 I. Arua, “Paleoenvironment of Eocene Deposits in the Afikpo Syncline,” Journal of African Earth Sciences, Vol. 5, No. 3, 1986, pp. 279-284.
 A. A. Onwuegbuche, “Geoelectrical Investigations in the Imo River Basin Nigeria,” Unpublished Ph.D. Thesis, 1993.
 B. I. Ijeh, “Assessment of Pollution Status and Vulnerability of Water Supply Aquifers in Parts of Imo River Basin, Southeastern Nigeria,” Unpublished Ph.D. Thesis, 2010.
 WHO, “Guidelines for Drinking Water, World Health Organization, Geneva, 2011.
 M. E. Offodile, “Ground Water Study and Development in Nigeria,” 2nd Edition, Mecon Geology and Engineering Services Limited, 2002, pp. 303-332.
 Clean Water Systems and Stores. http://www.cleanwaterstore.com/how-to-acid-water.html