To determine the impact of recreation on drinking water quality, a number of indicators of human pathogens and two commonly occurring parasites that frequently cause enteric disease outbreaks were measured. Water quality data were collected in three southern Vancouver Island watersheds that are characterized by low, medium, and high levels of watershed access and recreational activity. Parameters analysed included assays for the presence of Cryptosporidium oocysts, Giardia cysts, and fecal indicator bacteria. Basic water quality data were also collected. Raw water quality was then correlated with recreational activity. Fecal indicator bacteria suggest that water quality is poorer in the high recreation Shawnigan system. No patterns correlating watershed recreation with Cryptosporidium and Giardia concentrations or with water chemistry data were observed.
Westland Resource Group. 2000. Effect of Public Access on Drinking Water Within the Sooke, Koksilah, and Shawnigan Watersheds as Indicated by Cryptosporidium and Giardia Concentrations. BC Ministry of Environment Lands and Parks
Keywords: drinking, water quality, watershed
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