1996年《安全饮用水法案》（SDWA）的修正案要求美国环境保护局（USEPA）至少每六年审查并根据需要修订现有的国家初级饮用水法规。本文讨论了总大肠菌群规则，这是第一个可能修订的法规。包括24个参考文献和表格。

Amendments to the 1996 Safe Drinking Water Act (SDWA) require the US Environmental Protection Agency (USEPA) to review and revise as needed existing National Primary Drinking Water Regulations at least every six years. This article discusses the Total Coliform Rule, which is among the first regulations to be reviewed for possible revision. Includes 24 references, tables.