与第一阶段消毒剂/消毒副产品规则一样，临时强化地表水处理规则（IESWTR）源自美国环境保护局根据《联邦咨询委员会法》（FACA）于1992-93年召开的协商规则制定会议。同时解决水性病原体和消毒产品带来的潜在风险。尽管由于可能在DBP防护和病原体防护之间进行无意风险权衡，以及影响这两种风险评估的不确定性，该过程变得复杂，但监管谈判委员会能够设计出一种平衡、分阶段的监管方法。第二个FACA委员会在1996-97年最终确定了该方法。本文总结了效益成本分析的微生物方面，以及用于告知利益相关者和谈判者的显式不确定性分析。 包括21个参考文献、表格和图表。

Like the Stage 1 Disinfectants/Disinfection Byproducts Rule, the Interim Enhanced Surface Water Treatment Rule (IESWTR) grew out of the negotiated rulemaking the US Environmental Protection Agency convened in 1992-93 under the Federal Advisory Committee Act (FACA). The rulemaking sought to develop a consensus approach to simultaneously addressing potential health risks posed by disinfection by-products (DBPs) and waterborne pathogens. Even though the process was complicated by the possibility of making inadvertent risk-risk tradeoffs between protection from DBPs and protection from pathogens and uncertainties affecting the assessment of both risks, the regulatory-negotiations committee was able to devise a well-balanced, staged approach to regulation. A second FACA committee finalized the approach in 1996-97. This article summarizes the microbial side of the benefit-cost analysis and the explicit uncertainty analysis that was used to inform the stakeholders and the negotiators. Includes 21 references, tables, figures.