Long-term study of Cryptosporidium and Giardia occurrence and quantitative microbial risk assessment in surface waters of Arizona in the USA

Journal of Water and Health
Hodon Ryu, Morteza Abbaszadegan

Abstract

A four-year systematic study of microbial water quality in the surface waters of central Arizona was performed. The objectives of this study were to investigate the occurrence of microbial pathogens and indicators in the waters. A total of 192 water samples from five sites were analyzed for Cryptosporidium, Giardia, and various microbial and physical indicators. Ten percent (16/162) of the samples collected using EnviroChek filters were positive for Cryptosporidium oocysts, whereas no oocysts (<1 in 5 L) were detected in the grab samples (0/30). Giardia cysts were detected in 10% (3/30) of the grab samples and in 27% (44/162) samples collected using EnviroChek filters. Mean concentrations of oocysts in the source waters at the treatment plants were lower than the Bin 1 category of the USEPA Long Term 2 Enhanced Surface Water Treatment Rule; therefore no additional treatment is required by the plants. The annual risks of infection from Cryptosporidium met the annual acceptable risk of 10(-4) at all sampling sites, whereas the risks of Giardia infection at the Verde River and the Salt River were 5.70E-04 and 2.66E-04, respectively.

Citations

Sep 16, 2009·Epidemiology and Infection·E R DalyJ W Stull
May 7, 2011·International Journal of Environmental Health Research·Maria Tereza Pepe RazzoliniJoan B Rose
Dec 11, 2014·International Journal of Environmental Health Research·Ana Paola Balderrama-CarmonaMaría Mercedes Meza-Montenegro
Jun 21, 2013·Risk Analysis : an Official Publication of the Society for Risk Analysis·Jack SchijvenJan C Semenza
Jul 22, 2014·International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases·Ana Paola Balderrama-CarmonaMaría Mercedes Meza-Montenegro
Jun 27, 2017·Water Research·Artemis EfstratiouPanagiotis Karanis
Jan 20, 2018·Acta Parasitologica·Gabriela Ibáñez-CervantesJosé Manuel Hernández
Aug 3, 2019·The Science of the Total Environment·Samira ToloueiSarah Dorner

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