Assessing Microbial Safety of Drinking Waters: Perspectives by Organisation for Economic Co-Operation and Development

By Organisation for Economic Co-Operation and Development

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Additional resources for Assessing Microbial Safety of Drinking Waters: Perspectives for Improved Approaches and Methods

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A long-established principle in drinking water risk management is not to rely on a single barrier against pathogenic microorganisms, but to use a multiple barrier approach. 1). As suggested above, in order to design an effective risk management strategy, information is required on: • Sources of contamination in the catchment area. This would also include the relative contribution of these sources to the overall contamination level. Knowledge of the nature, location and contribution made by individual sources of contamination means that it is possible to predict peak events and to determine effective catchment control measures.

Sasaki, N. J. (2001) Helicobacter pylori infection and the development of gastric cancer. New England Journal of Medicine 345(11), 784-789. US Department of Health and Human Services (1998) Preventing emerging infectious diseases: A strategy for the 21st century. US Department of Health and Human Services, Atlanta, Georgia. 44 USEPA (1991) Guidance Manual for Compliance with Filtration and Disinfection Requirements for Public Water Systems using Surface Water Sources. US Environmental Protection Agency, Washington, DC.

To ensure that treatment is eliminating microorganisms adequately every hour of the day, they need information on the relationship between the operational parameters and the elimination of microorganisms (Chapter 5; LeChevallier and Au, 2002). Finally, the company/agency that distributes the water to the consumer needs information about the water-quality changes that occur during distribution so as to be able to detect and respond to any unacceptable deterioration of water quality (see Chapter 6 and Ainsworth, 2002).

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