How Effective is the TCR in Assessing Outbreak Vulnerability?

摘要: Previous studies have shown that waterborne disease outbreaks can occur in systems not exceeded the maximum contaminant level (MCL) regulations for coliform bacteria. The utility of revised Total Coliform Rule (TCR), which has been effect since Dec. 31, 1990, was evaluated as an indicator outbreak vulnerability public water systems. This study compared TCR violations had and reported during 1991-98. Few violated MCL 12-month period before outbreak, monitoring did differ significantly nonoutbreak studied. These findings suggest is able to identify those are vulnerable outbreak. Requirements may need be supplemented by additional currently collect few samples. When evaluating adequacy indicator, it important consider agents frequency sample collection. thoroughness a sanitary survey also detect correct deficiencies might lead Current focuses on detection coliforms distribution system after treatment; however, more effective-especially small groundwater systems-to monitor source quality assess potential contamination from sewage discharges surface runoff rather than increase monitoring.