分布中的总大肠菌群监测 这个系统可能是最昂贵、最密集的 法律规定的采样，以及 总成本要求的国家抽样成本 大肠菌群规则（TCR）计算为 每年超过1亿美元。除了 然而，最大的公用事业公司要求进行采样 根据TCR，这不足以衡量 有信心的话，真正的差异 大肠菌群在两个月之间出现。因为 除了一个 几乎没有大型设施，大多数样本量太大 小型系统能够验证其有效性 在以下情况下采取任何缓解措施: TCR违规。 本文解释了统计上的局限性 并认为 目前对总大肠菌群的监测并不准确 达到规定的目标。此外 作者们提出了一些策略来增强 从总大肠菌群中恢复信息 观察。包括7个参考文献、表格、图表。

Total coliform monitoring in the distribution system is perhaps the most expensive and intensive sampling mandated by law, with the national cost of sampling required by the Total Coliform Rule (TCR) calculated as being in excess of $100 million annually. For all but the largest utilities, however, the sampling mandated under the TCR is inadequate to measure with any confidence the real differences in total coliform occurrence between months. Because of the low number of samples taken by all but a few large facilities, most sample sizes are too small for systems to be able to verify the effectiveness of any mitigative action following a TCR violation. This article explains the statistical limitations of current TCR practices and argues that current monitoring of total coliform does not meet the stated objectives of the rule. In addition, the authors suggest strategies to enhance information recovery from total coliform observations. Includes 7 references, tables, figures.