Keziah Nwamaka IBEMENUGA, Diana Akudo AVOAJA


This study assessed the quality of 60 groundwater wells within the Bombali District of Sierra Leone. Water samples from the wells were analysed for physical (temperature, turbidity, conductivity, total dissolved solids and salinity), chemical (pH, nitrate-nitrogen, sulphate, calcium, ammonia, fluoride, aluminium, iron, copper and manganese) parameters using potable water testing kit; and bacteriological (faecal and non-faecal coliforms) qualities. Results show that 73% of the samples had turbidity values below the WHO, ICMR and United USPHS standards of 5 NTU. The electrical conductivity (mS/cm) of 5% of the whole samples exceeded the WHO guideline value, 8% of the entire samples had values higher than the WHO, ICMR and USPHS recommended concentration. In terms of iron, 25% of all the samples had values in excess of WHO, ICMR and USPHS recommended value of 0.3mg/l. For manganese, 12% of the entire samples had values more than the WHO and ICMR standards. On the other hand, more water samples (22%) had manganese values above USPHS guideline value. For bacteriological quality, 28% of the wells were polluted by faecal and non-faecal coliforms. 60% and 40% of the entire samples had faecal and non-faecal coliforms respectively above the WHO standard. Remedial measures recommended include regular monitoring of the physico-chemical and bacteriological quality of water yield from these wells as well as teaching of the communities' basic sanitation and hygiene practices. 

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ALABASTER, J. S. and LIOYD, R. (1980). Water Quality Criteria for Freshwater Fish. FAO and Butterworth, London.

ADELEKAN, B. A. (2010). Water quality of domestic wells in typical African communities: case studies from Nigeria. International Journal of Water Resources and Environmental Engineering, 2(6): 137 – 149.

APHA (2005). Standard Methods for the Examination of Water and Waste Water. Fourteenth Edition, American Public Health Association (APHA), Washington DC, USA.

ASONYE, C. C., OKOLIE, N. P., OKENWA, E. E. and IWUANYANWU, U. G. (2007). Some physico-chemical characteristics and heavy metal profiles of Nigerian rivers, streams and waterways. African Journal of Biotechnology, 6(5): 617 – 624.

BONDE, G. J. (1977). Bacterial indicator of water pollution. Advanced Aquatic Microbiology, 1: 273 – 275.

BOYD, C. E. (1979). Water Quality Management for Pond Fish Culture. Elsevier, Amsterdam.

CHIMA, G. N. and DIGHA, O. N. (2007). The impact of flooding on river bank erosion in the central Niger Delta region: The case of Bayelsa State, Nigeria. International Journal of Biotechnology and Allied Sciences, 2(1): 120 – 125.

CHIMA, G. N., NWAUGO, V. O. and OKPE, V. C. (2007). Water resources development in Nigeria: Some environmental considerations - a review. International Journal of Biotechnology and Allied Sciences, 2(1): 109 – 115.

CLESCERI, L. S., GREENBERY, A. E. and EATON, A. D. (1998). Standard Methods for the Examination of Water and Wastewater. Twentieth Edition, American Public Health Association, Washington DC, USA.

COMMONWEALTH OF AUSTRALIA (2002). Water Watch Australia Technical Manual: Module 4, Physical and Chemical Parameters, 52 pp.

EGBORGE, A. B. M. (1977). The Hydrology and Plankton of the Asejire Lake, Nigeria. Ph.D. Thesis, University of Ibadan, Nigeria.

FERNANDO, J. S. (2005). Moringa: The Ultimate Answer to Polluted Water. Accessed July 15, 2007.

GARBA, S. N., AJAYI, A. D., ISA, A., ANYEBE, E. E. and INUSA, B. (2008). Sources of water and practice of water purification: its public health implication on residents of Saminaka, Kaduna State, Nigeria. Best Journal, 5(3): 82 – 87.

HASSAN, A. S., OKUOFU, C. A. and BALOGUN, J. K. (2008). The use of biological index of pollution (BIP) in assessing quality of rural waste sources in Zaria, Nigeria. Science World Journal, 3(2): 101 – 105.

HYNES, H. B. N. (1970). The ecology of stream insects. Annual Review of Entomology, 15: 25 – 42.

IBEMENUGA, K. N. and INYANG, N. M. (2007). Physico-chemical characteristics of a tropical stream in Nigeria. Bio-Research, 2: 275 – 281.

ICMR (1975). Manual of Standards of Quality for Drinking Water Supplies. Special Report Series Number 44, Indian Council of Medical Research, New Delhi, India.

KOLO, R. J. and TUKURA, M. D. (2007). Aspects of limnological studies of Tagwai Dam, Minna, Niger State, Nigeria. Journal of Aquatic Sciences, 22(1): 27 – 32.

LEWIS, R., GAFFIN, D., HOEFNAGELS, M. and PAKER, B. (2004). Life. Fifth Edition, McGraw-Hill, New Yoke, USA.

L’HIRONDEL, J. L. (2002). Nitrate and Man: Toxic., Hardness, or Beneficial? CABI Publications, Wallingford, United Kingdom.

LIND, O. T. (1974). Handbook of Common Methods in Limnology. The C. V. Mosby Company, Saint Louis, Missouri, USA.

LUCAS, A. O. and GILLES, H. M. (2003). Short Textbook of Public Health Medicine for the Tropics. Fourth Edition, Book Power, London.

MADER, S. S. (1993). Biology. W.M.C. Brown Communications Incorporated, USA.

MASAMBA, W. R. L. and MAZVIMAVI, D. (2008). Impact on water quality of land uses along Thamalakane - Boeti River: An outlet of the Okavango Delta. Physics and Chemistry of the Earth, 33: 687-694.

MASON, C. F. (1996). Biology of Freshwater Pollution. Third Edition, Longman Group Limited, United Kingdom.

MASONDA, K. W. M., MASAMBA, W. R. L. and FABIANO, E. (2007). A study of fluoride groundwater occurrence in Nthenje, Lilongwe, Malawi. Physics and Chemistry of the Earth, 32: 1178-1184.

MCMURRY, J. and CASTELLION, M. E. (2003). Fundamentals of General Organic and Biological Chemistry. Fourth Edition, Pearson Education Incorporated, Upper Saddle River, New Jersey, USA.

MEWR (2010). The National Water and Sanitation Policy. Ministry of Energy and Water Resources (MEWR), Federal Government of Sierra Leone, Freetown, Sierra Leone.

MKANDAWIRE, T. (2008). Quality of groundwater from shallow wells of selected villages in Blantyre District, Malawi. Physics and Chemistry of the Earth, 33: 807 – 811.

NEST (1991). Nigeria’s Threatened Environment: A National Profile. Nigeria Environmental Study/Action Committee (NEST), Federal Ministry of Environment, Abuja, Nigeria.

OBIRE, O. and AGUNDA, M. (2002). Bacterial community of leachate from a waste dump and an adjacent stream in Nigeria. Journal of Applied Sciences and Environmental Management, 6(2): 71 – 75.

PERSCHBACHER, P. W. and WURTS, W. A. (1999). Effects of calcium and magnesium hardness on acute copper toxicity to juvenile channel catfish Ictalurus punctatus. Aquaculture, 172: 275 – 280.

PRITCHARD, M., MKANDAWIRE, T. and O’NEILL, J. G. (2008). Assessment of groundwater quality in shallow wells within the southern districts of Malawi. Physics and Chemistry of the Earth, 33: 812 – 822.

USAID (1990). Strategies for linking water and sanitation programmes to child survival. United States Agency for International Development (USAID), Washington DC, USA.

USPHS (1962). Drinking Water Standards. USPHS 956, United States Public Health Service (USPHS), Washington DC, USA.

UNESCO (2007). Water Related Diseases. United Nations Educational, Scientific, and Cultural Organization (UNESCO) Water Portal Newsletter, Number 161, , Accessed January 3, 2008.

WARD M. H., DE KOK, T. M., LEVALLOIS P., BRENDER J., GULIS G., VANDERSLICE, J. and NOLAN B. T. (2006). Response to dietary nitrate: Where is the risk? Environmental Health Perspective, 114: A459 – A460.

WELCOME, R. (1985). River fisheries. FAO Fisheries Technical Paper, 262: 1 – 327.

WHO (1993). Guidelines for Drinking Water Quality. World Health Organization, Geneva, Switzerland.

WHO (1996). Guidelines for Drinking Water Quality, Volume 2, Second Edition, Health Criteria and Other Supporting Information, World Health Organization, Geneva, Switzerland.

WHO (1997). Health and Environment in Sustainable Development; Five Years after the Earth Summit. (WHO/EHG/97.8), World Health Organization, Geneva, Switzerland.

WHO (2005). International Standards for Drinking Water. World Health Organization, Geneva, Switzerland.


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