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Correspondence Kafeelah Abosede Yusuf, Department of Chemistry, Faculty of Science, Lagos State University, Nigeria Email: kafyusuf@yahoo.co.uk Funding information Authors sponsor Abstract: Introduction: The inadequacy of pipe borne water supplies in urban centers is a growing problem. In recent years, packaged waters became major sources of drinking water in the households and at work. Aims: This study aimed at assessing drinking quality parameters of packaged water sold in some selected part of Lagos and compares them with the quality of tap water. Materials and Methods: fifty seven packaged water samples from several commercial brands selected randomly and thirty tap water samples supplied by municipal pipelines were analysed for different chemical and physical parameters. Trace metals and major ions were analysed using atomic absorption spectrometry; Total hardness and chloride were measured titrimetically; pH and electrical conductivity were measured using a multi-purpose meter. Results: The results showed that the concentrations of the water constituents in both tap and packaged water were below the drinking water threshold values stipulated by national and international agencies, with the exception of the nitrate (NO3) content in packaged water, where 11 % and 20 % respectively of the bottled and sachet water samples investigated exceeded the United State Environmental Protection Agency (USEPA) standard of 10 mg L-1. This finding may result from a number of different reasons including substances dissolving from either natural sources or from household plumbing systems. Conclusion: This study concludes that the systematic monitoring by drinking water authorities of water quality is essential and that a uniform system for quality control and assurance is required by the enforcement agencies (National Agency for Foods and Drugs Administration and Control and the Ministry of Health) in the 'packaged water' industry.

Drinking Water Quality: Physical and Chemical Evaluation of Tap and Packaged Waters from Eight Local Government Areas in Lagos, Nigeria