本文讨论了美国环境保护局（USEPA）的饮用水污染物候选名单（DWCCL），即不受任何提议或颁布的国家初级饮用水法规约束的饮用水污染物名单。具体来说，本文讨论了:DWCCL是如何在1996年开发的；DWCCL在确定哪些污染物受到监管方面的未来作用；以及国家饮用水污染物发生数据库（NCOD），该数据库将存储受管制和未受管制污染物的发生数据。

This article discusses the US Environmental Protection Agency's (USEPA's) Drinking Water Contaminant Candidate List (DWCCL), a list of drinking water contaminants not subject to any proposed or promulgated National Primary Drinking Water Regulation. Specifically, the article discusses: how the DWCCL was developed in 1996; the future role of the DWCCL in determining which contaminants are regulated; and, the National Drinking Water Contaminant Occurrence Database (NCOD), which will store occurrence data for both regulated and unregulated contaminants.