Water Quality in Selected Shallow Wells in Dar es Salaam
DOI:
https://doi.org/10.61538/huria.v11i0.498Abstract
Majority of Dar es Salaam residents depend mostly on ground water for their domestic use because, they are not connected to the city water supply system, or the supply system is not reliable. Due to widespread use of groundwater (shallow and deep wells), the scientific determination of quality of this mass consumed product is essential. In this study the water quality parameters: physical, chemical and biological contaminants on the shallow wells were investigated around Dar es Salaam City.  Except for Total Dissolved Solids (TDS) and Total Hardness, other physical parameters tested were within the WHO acceptable range. Levels of phosphate in samples from Temeke district ranges from 0.42 – 1.20 ppm, while samples from Ilala ranges from 0.16 – 0.36. Meanwhile chloride levels in samples from Temeke ranges between 158.40 – 624.14 ppm and Ilala ranges between 142.34 – 359.52 ppm. This could be due to human activities such as small industries and unplanned waste dumping sites close to water source.  All water samples were contaminated with both Total Coliform (TC) and Fecal Coliform (FC). The highest TC and FC levels were detected in the sample from Vikunai Village in Temeke municipality (2160/100ml and 67/100ml respectively). This was due to proximity of pit latrines and runoff during rainfall because shallow wells are neither covered nor built up above ground level to create barriers against storm water inflow.  Generally, water from shallow wells in Dar es Salaam City is bacteriologically and chemically contaminated. The source of contamination is on-site waste disposal and poor hygiene education. It is recommended that water from wells must be treated prior to consumption in order to prevent potential infections. Residents ought to be provided with water quality management education so that they could know how to treat, store and maintain the quality of drinking water.References
Ahmed, A. L. M., Sulaiman, W. N., Saeed, E. M. and Mohamed, Y. A. (2000). "Groundwater Quality in Khartoum State, Sudan." Journal of
Environmental Hydrology 8, 1- 7.
American Water Works Association (AWWA) (2006). American Public Health Association (APHA), & Water Environment Federation (WEF) Standard Methods for the Examination of Water and Wastewater. Washington, DC: APHA.
Anderson, T. W. and Hewitt D. (1975). Mortality and Water Hardness. Letter, Lancet. 1(7911): 868.
Bassett, J., Denny, R. C., Jeffery, G. H. and Mendham J. (1979). Vogels Text Book of Quantitative Inorganic Analysis, 4th Ed. UK.
Brooker, M. P. and Johnson, P. C. (1984). Behaviour of Phosphate, Nitrate, Chloride and Hardness in Welsh Rivers. J. Water Research, 18(9):11551164.
Bossman, L. (2011). Fifty years of Water Sector in Tanzania, BORDA Southern Africa, SADC, Bremen Overseas research and development Association, in http://www.borda-sadc.org/news/newsdetails-sadc/article/50-years-ofwater-sector-in-tanzania.html (accessed on 9th December 2011).
Bourque, E. (2010). Urban Governance and Unequal Geographies of Water in Buguruni Ward, Dar es Salaam, Tanzania. PhD Thesis. Kings College: London.
DCC (2004). City Profile for Dar es Salaam. United Republic of Tanzania. Dar es Salaam.
Eisenberg, M. J. (1992). Magnesium Deficiency and Sudden Death. Am Heart J. 124 (2):544 – 549.
Evans, L. J. (1989). “Chemistry of Metal Retention by Soils. J. Environ. Sci. Tech., 23: 1046 - 1056.
Howorth, C., Convery, I. and O’Keefe, P. (2001). Gardening to Reduce Hazard: Urban Agriculture in Tanzania. Land Degrad. Develop. 12: 285 – 291.
Ingraham, J. L., Wheelis, M. L., Painter, P. R. and Stanier, R. Y. (1987). Microbiological Growth and the Enteric Group and Related Wubacteria: General Microbiology, 5th Edn. Macmillan Education Ltd.
Ngana, J. and Cress, K. (2010). The Ruvu Basin, A Situation Analysis, International Union for Conservation of Nature and Natural Resources Eastern and Southern Africa Programmes. ESARO Publications Service Unit: Nairobi Kenya.
Lamond, R. E., Hickman, J. S. & G. Powell M. (1989). Nitrates and Groundwater. Cooperative Extension Service: Manhattan, Kansas.
Leurs, L. J., Schouten, L. J., Mons, M. N., Goldbohm, R. A. and Brandt, P. (2010). Relationship Between Tap Water Hardness, Magnesium, and Calcium Concentration and Mortality due to Ischemic Heart Disease or Stroke in the Netherlands. Environ Health Perspect., 118(3): 414–420.
Madavine T. (2008). Report on Baseline Survey of Household Waterpoints UNICEF ZAMBIA, WASHE Section, Self Supply and CLTS Programme, http://www.rwsn.ch/documentation/skatdocumentation.2011-0310.0847410211/file (accessed on 15th December 2011).
Miyake, Y. and Iki, M. (2003). Ecologic Study of Water Hardness and Cerebrovascular Mortality in Japan. Archives of Environmental Health: An International Journal 58, (3), 163 – 166.
Mbwette, T. S. (2010). Critical Overview of the Global Quality and Regulatory Framework for Bottled Water and the Increasing Role of the Private Sector in the Provision of Drinking Water in Tanzania, The Open University of Tanzania. Professorial Lecture Series no. 1, pp 10 -12.
Ngowi, A.V.F., Mbise, T. J., Ijani, A. S. M., London, L. and Ajayi, O. C. (2007). Pesticides use by Smallholder Farmers in Vegetable Production in Northern Tanzania. J. Crop Prot. 26(11): 1617–1624.
Nielsen, J. E.; Dahi, E. and Thogersen, J. (1996). Water Quality in Selected Wells and Springs: In Selected Fields on Hygienic Drinking water Quality in Tropics. Centre for Developing Countries: Technical University of Denmark.
Nordstrom, D. K., Alpers, C. N.,Ptacek, C. J., Blowes, D. W. (2000). "Negative pH and Extremely Acidic Mine Waters from Iron Mountain, California". Environmental Science & Technology 34 (2): 254.
Saria, J. A. and Irene, T. (2011a). Heavy Metal Levels in Drinking Water: Mining Area vis-à -vis Poorly Planned City in Tanzania. Huria Journal 9: 70 – 79.
Saria, J. A. Semiono, P., Shija, S., Kyobe, J. and Mbwiliza, J. (2011b); Determination of Water Quality Supplied to Residents on Outskirt of Dar es Salaam City, Tanzania Journal of Natural and Applied Science, 2(1): 277 – 285.
Still, D. A. and Nash, S. R. (2002). Groundwater Contamination Due to Pit Latrines
Located in a Sandy Aquifer: A Case Study From Maputaland http://www.sswm.info/sites/
default/files/reference_attachments/STILL%20nd%20NASH%202002%20 Groundwater%20contamination%20due%20to%20pit%20latrines%20locat ed%20in%20a%20sandy%20aquifer.pdf (Accessed on 13th December
.
Sugden, S. (2006). The Microbiological Contamination of Water Supplies; http://www.lboro.ac.uk/well/resources/fact-sheets/fact-sheetshtm/Contamination.htm (Accessed on 14th December 2011).
Tanzania Bureau of Standard (2008). Finalized Tanzania Standard for Natural Mineral Water.
Thomas, I. M. (2011). Assessment of Groundwater Quality and Sanitation in Relation to Public Health at Ukonga Residential area, Dar es Salaam- Tanzania. Msc Thesis, University of Wangeningen: Netherlands.
UNDP (2011). Poverty Reduction and Environment and Energy, Services and Supply Chain: The Role of the Domestic Private Sector in Water Services Delivery in Tanzania. NY, USA.
URT (2006). The National Water Sector Developmental Strategy (NWSDS).
WHO (2006), Water Treatment and Pathogen Control Process: Efficiency in Achieving Safe Drinking Water. Geneva, Switzerland: World Health Organisation.
Yang, C. (1998). Calcium and Magnesium in Drinking Water and Risk of Death from Cerebrovascular Disease, Stroke, 29, 411 – 414.
