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Reasonable methods for accounting for microbial peaks in the quantification of drinking water treatment requirements need to be addressed. Here, we applied a novel method for data collection and model validation to explicitly account for weather events (rainfall, snowmelt) when concentrations of pathogens are estimated in source water. Online <jats:italic>in situ \u03b2<\/jats:italic>\u2010<jats:sc>d<\/jats:sc>\u2010glucuronidase activity measurements were used to trigger sequential grab sampling of source water to quantify <jats:italic>Cryptosporidium<\/jats:italic> and <jats:italic>Giardia<\/jats:italic> concentrations during rainfall and snowmelt events at an urban and an agricultural drinking water treatment plant in Quebec, Canada. We then evaluate if mixed Poisson distributions fitted to monthly sampling data ( = 30 samples) could accurately predict daily mean concentrations during these events. We found that using the gamma distribution underestimated high <jats:italic>Cryptosporidium<\/jats:italic> and <jats:italic>Giardia<\/jats:italic> concentrations measured with routine or event\u2010based monitoring. However, the log\u2010normal distribution accurately predicted these high concentrations. The selection of a log\u2010normal distribution in preference to a gamma distribution increased the annual mean concentration by less than 0.1\u2010log but increased the upper bound of the 95% credibility interval on the annual mean by about 0.5\u2010log. Therefore, considering parametric uncertainty in an exposure assessment is essential to account for microbial peaks in risk assessment.<\/jats:p>","DOI":"10.1111\/risa.13612","type":"journal-article","created":{"date-parts":[[2020,10,26]],"date-time":"2020-10-26T12:37:16Z","timestamp":1603715836000},"page":"1413-1426","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Impact of Hydrometeorological Events for the Selection of Parametric Models for Protozoan Pathogens in Drinking\u2010Water Sources"],"prefix":"10.1111","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6537-2313","authenticated-orcid":false,"given":"\u00c9mile","family":"Sylvestre","sequence":"first","affiliation":[{"name":"NSERC Industrial Chair on Drinking Water, Department of Civil, Geological, and Mining Engineering Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"},{"name":"Canada Research Chair in Source Water Protection, Department of Civil Geological, and Mining Engineering, Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jean\u2010Baptiste","family":"Burnet","sequence":"additional","affiliation":[{"name":"NSERC Industrial Chair on Drinking Water, Department of Civil, Geological, and Mining Engineering Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"},{"name":"Canada Research Chair in Source Water Protection, Department of Civil Geological, and Mining Engineering, Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah","family":"Dorner","sequence":"additional","affiliation":[{"name":"Canada Research Chair in Source Water Protection, Department of Civil Geological, and Mining Engineering, Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patrick","family":"Smeets","sequence":"additional","affiliation":[{"name":"KWR Water Research Institute  Groningenhaven 7 Nieuwegein 3433 PE The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gertjan","family":"Medema","sequence":"additional","affiliation":[{"name":"KWR Water Research Institute  Groningenhaven 7 Nieuwegein 3433 PE The Netherlands"},{"name":"Sanitary Engineering, Department of Water Management, Faculty of Civil Engineering and Geosciences Delft University of Technology  P.O. Box 5048 Delft 2600GA The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manuela","family":"Villion","sequence":"additional","affiliation":[{"name":"Centre d'expertise en analyse environnementale du Qu\u00e9bec Minist\u00e8re de l'Environnement et de la Lutte contre les changements climatiques  Qu\u00e9bec Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mounia","family":"Hachad","sequence":"additional","affiliation":[{"name":"NSERC Industrial Chair on Drinking Water, Department of Civil, Geological, and Mining Engineering Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"},{"name":"Canada Research Chair in Source Water Protection, Department of Civil Geological, and Mining Engineering, Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mich\u00e8le","family":"Pr\u00e9vost","sequence":"additional","affiliation":[{"name":"NSERC Industrial Chair on Drinking Water, Department of Civil, Geological, and Mining Engineering Polytechnique Montreal  Montreal Quebec H3C 3A7 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2020,10,26]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.2166\/wh.2007.139"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/j.1551-8833.1998.tb08499.x"},{"volume-title":"Water quality engineering : Physical\/chemical treatment processes","year":"2013","author":"Benjamin M. 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