Characterizing the concentration of Cryptosporidium in Australian surface waters for setting health-based targets for drinking water treatment

Journal of Water and Health
S PettersonD Deere

Abstract

It is proposed that the next revision of the Australian Drinking Water Guidelines will include 'health-based targets', where the required level of potable water treatment quantitatively relates to the magnitude of source water pathogen concentrations. To quantify likely Cryptosporidium concentrations in southern Australian surface source waters, the databases for 25 metropolitan water supplies with good historical records, representing a range of catchment sizes, land use and climatic regions were mined. The distributions and uncertainty intervals for Cryptosporidium concentrations were characterized for each site. Then, treatment targets were quantified applying the framework recommended in the World Health Organization Guidelines for Drinking-Water Quality 2011. Based on total oocyst concentrations, and not factoring in genotype or physiological state information as it relates to infectivity for humans, the best estimates of the required level of treatment, expressed as log10 reduction values, ranged among the study sites from 1.4 to 6.1 log10. Challenges associated with relying on historical monitoring data for defining drinking water treatment requirements were identified. In addition, the importance of quantitative microbi...Continue Reading

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Citations

Jul 22, 2016·Journal of Water and Health·S R Petterson, N J Ashbolt
Oct 27, 2020·Risk Analysis : an Official Publication of the Society for Risk Analysis·Émile SylvestreSarah Dorner
Jun 6, 2021·The Science of the Total Environment·S PettersonP Byleveld

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