2 2 G it © Uap o£ Drinking Water Quality Improvement Plan Water and Environment Committee Meeting - September 17, 1990 report submitted to the Board in June 1986 the system's bacterial water Practices. prepared by h, testing District staff, member S. 2.0 DRINKING WATER QUALITY CONCERNS A number of basic concerns have been identified by the research program and the implications of each on water quality and health are summarized ag follows: Turbidity Excessive turbidity (cloudiness) in the water occasionally results from heavy winter rains causing natural slides and erosion on steeper, unstable areas of the watersheds. Turbidity, while undesirable from an aesthetic perspective, is also undesirable from a health aspect as the presence of the suspended matter causing the cloudiness can impede the ability of the primary disinfectant, chiorine, to provide adequate disinfection. Bacterial Regrowth Increased levels of nen=pathogenic bacterial growth in the warmer summer and fall months are t of low or zero chlorine residuals in the However, outbreaks of this water borne disease have occurred without warning on other surface water Supplies in B.C. and Washington State in recent years and precautions need to be taken. Although the GVWD has closed watersheds, animals PAGE ; SO