A Deterministic Risk Assessment of the Human Exposure to Cadmium, Lead and Chromium Through the Consumption of Well and Bottled Water in Lusaka District, Zambia

  • Mkuzi Banda Zambia Compulsory Standards Agency, P.O. Box 31302 Lusaka, Zambia
  • John Bwalya Muma Department of Disease Control, School of Veterinary Medicine, University of Zambia. P.O. Box 32379, Lusaka, Zambia
  • Flavien N. Bumbangi School of Medicine, Eden University, P.O. Box 37727, Lusaka, Zambia
  • Ethel M'kandawire Department of Disease Control, School of Veterinary Medicine, University of Zambia. P.O. Box 32379, Lusaka, Zambia
  • Mercy Mukuma The University of Zambia
  • Musso Munyeme Department of Disease Control, School of Veterinary Medicine, University of Zambia. P.O. Box 32379, Lusaka, Zambia
  • Grace Musawa Lusaka District Health Office, P.O. Box 50827, Lusaka, Zambia
  • Enock M Ndaki Livestock Training Agency (LITA), Buhuri Campus, P.O. BOX 1483, Tanga-Tanzania
  • Vistorina Benhard Ministry of Agriculture, Water and Land Reform, Private Bag 12022, Auspannplatz, Windhoek, Namibia
  • Chisoni Mumba Department of Disease Control, School of Veterinary Medicine, University of Zambia. P.O. Box 32379, Lusaka, Zambia https://orcid.org/0000-0002-4662-0876
Keywords: Carcinogenic Risk, Heavy Metal Pollution, Human Health Risk Assessment, Non-Carcinogenic Risk, Zambia

Abstract

The United Nations Sustainable Development Goal number six is to ‘Ensure availability and sustainable management of water and sanitation for all, which is an essential component for human survival. Access to safe drinking water is essential for health, a basic human right and a component of effective policy for health protection. Safe drinking water implies that the water does not represent any significant risk to health over a lifetime of consumption, including different sensitivities that may occur between life stages. However, water is prone to contamination with heavy metals through natural and anthropogenic sources, making it unsuitable for human consumption due to the cumulative potential risks associated with the presence of heavy metals. This study was conducted to assess the non-carcinogenic and carcinogenic risk of human exposure to cadmium, lead and chromium through the consumption of well and bottled water in Lusaka district of Zambia. Secondary data was used to determine the mean concentrations of heavy metals in well and bottled water in Lusaka district as well as to calculate the hazard index (non-carcinogenic risk) and cancer risk for the metals under study. The results revealed that a hazard index for cadmium, lead and chromium in both well and bottled water was higher than 1, indicating adverse effects on human health over a lifetime of consumption. Similarly, the total cancer risk through exposure to cadmium and chromium in well and bottled water was 1.2 x 10-1 and 2.25 x 10-1, respectively, higher than the safe threshold limit set by the United States Environmental Protection Agency (USEPA) of 1 × 10−4. The study concludes that there is a possible non-carcinogenic risk of exposure to cadmium, lead and chromium through the consumption of well and bottled water in Lusaka district. Further, the study concludes that there is a possible carcinogenic risk of exposure to cadmium and chromium through the consumption of both well and bottled water. Owing to the proportion of both well and bottled water samples that exceeded the Zambia Bureau of Standards threshold limit, cadmium poses the greatest concern and requires intervention to reduce exposure. Therefore, it is recommended that heavy metal concentrations in drinking water should be periodically monitored to minimize health risks to consumers.

Author Biography

Chisoni Mumba, Department of Disease Control, School of Veterinary Medicine, University of Zambia. P.O. Box 32379, Lusaka, Zambia
Chisoni Mumba, PhD, is a Senior Lecturer and Researcher of Animal Health Economics at the University of Zambia, School of Veterinary Medicine. His research interests are in Animal Health Economics, Systems Thinking, and Participatory Epidemiology. He is currently working on the application of systems thinking to address dynamic and complex animal health problems so as to achieve long-term solutions and avoid unintended consequences.

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Published
2023-02-28
How to Cite
1.
Banda M, Muma J, Bumbangi F, M’kandawire E, Mukuma M, Munyeme M, Musawa G, Ndaki E, Benhard V, Mumba C. A Deterministic Risk Assessment of the Human Exposure to Cadmium, Lead and Chromium Through the Consumption of Well and Bottled Water in Lusaka District, Zambia. Journal of Agricultural and Biomedical Sciences [Internet]. 28Feb.2023 [cited 12Jul.2025];6(2). Available from: https://journals.unza.zm/index.php/JABS/article/view/914