AWWA WQTC58789

AWWA WQTC58789 Water Quality Risk Assessment and Management - Implementation in Real Water Supplies
Conference Proceeding by American Water Works Association, 11/02/2003

Chapman, Mike; Nadebaum, Peter; Finlayson, Greg; Carne, Steve

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This paper summarizes work with some twenty Australian and New Zealand water utilities over the past five yearson implementation of risk assessments, developing Hazard Analysis and Critical Control (HACCP) plans andstructuring overall Water Quality Management systems.Key results of this work, discussed in this paper, include:methodology and examples of efficient, accurate and integrated risk identification and assessment focussed onidentifying high risks in terms of specific sources, controls and critical controls for catchments, reservoirs, watertreatment plants and distribution systems;methodology and examples of how risks can be routed through the catchment to tap water supply systems andhow risk can be modulated by controls;development of a semi-quantitative model for assessment of Cryptosporidium and Faecal Streptococci risks forboth water supply and recreational waters using appropriate scientific research data for sources, transport,decay, treatment effects and disease risk tailored to each unique water supply system arrangement;how risk assessment outcomes are incorporated into HACCP plans which suit water industry operation and theneed to consider both critical points and multiple barriers;how risk assessment and HACCP plans are incorporated into overall Water Quality Management systemsconsistent with ADWG Framework, ISO9001 and likely WHO principles; and,how computer based platforms may be used to best advantage in this work.The significance to the Water Industry of this work is primarily that it represents a substantial compilation ofoperational case studies and "do's and don'ts" for risk management covering drinking water examples.Effective use of computer and web based support systems is also highlighted as it helps ensure that the risk assessmentis accurate and comprehensive and that it is user friendly, easily updated and keptaccurate in the operating environment of water utilities. Includes 9 references, tables, figures.