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STRATEGIES FOR MONITORING THE BACTERIOLOGICAL QUALITY OF WATER SUPPLY IN DISTRIBUTION SYSTEMS
Citation:
Geldreich, E., J. Goodrich, AND R. Clark. STRATEGIES FOR MONITORING THE BACTERIOLOGICAL QUALITY OF WATER SUPPLY IN DISTRIBUTION SYSTEMS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-89/123 (NTIS PB90112632), 1989.
Description:
Monitoring strategies for characterizing the bacteriological quality of water in the distribution system require a complete understanding of a variety of interrelated aspects that include treated water quality, water supply retention in storage and infrastructure deterioration in the distribution system. tudy of field data from several water supply utilities was used to highlight some innovative interpretations of compliance monitoring data. Major perceptions include: he use of a 5 percent coliform frequency of occurrence limit highlights compliance significance in those situations where there are clusters of positive samples containing less than 4 coliforms per 100 mL. nfortunately, this presence/absence concept does not provide any indication of the magnitude of a contamination event. hile new regulations have given greater significance to the repeat sampling program, the use of a presence/absence test in repeat sampling should be replaced by a quantitative crane filter test to achieve more information on the extent of contamination.
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STRATEGIES FOR MONITORING THE BACTERIOLOGICAL QUALITY OF WATER SUPPLY IN DISTRIBUTION SYSTEMS