monitoring need to be conducted for most of the contaminants on the 1998 CCL, the list is also used to prioritize these related activities.

This is the third report by the Committee on Drinking Water Contaminants (jointly overseen by the National Research Council’s [NRC’s] Water Science and Technology Board and Board on Environmental Studies and Toxicology). The committee was formed early in 1998 at the request of EPA’s Office of Ground Water and Drinking Water to provide advice regarding the setting of priorities among drinking water contaminants in order to identify those contaminants that pose the greatest threats to public health. The committee is comprised of 14 volunteer experts in water treatment engineering, toxicology, public health, epidemiology, water and analytical chemistry, risk assessment, risk communication, public water system operations, and microbiology.

In its first report, Setting Priorities for Drinking Water Contaminants, the committee recommended a phased decision-making process, time line, and related criteria to assist EPA efforts to set priorities and decide which contaminants already on a CCL should be subjected to regulation development, increased monitoring, or additional health effects, treatment, and analytical methods research. That report also includes a review of several past approaches to setting priorities for drinking water contaminants and other environmental pollutants. The committee later organized and conducted an NRC workshop on emerging drinking water contaminants and subsequently published a second report entitled Identifying Future Drinking Water Contaminants. That report includes a dozen papers presented at the workshop by government, academic, and industry scientists on new and emerging microbiological and chemical drinking water contaminants, associated analytical and water treatment methods for their detection and removal, and existing and proposed environmental databases to assist in their proactive identification and potential regulatory consideration. Notably, the workshop papers are preceded by a short committee report that provides a conceptual approach to the creation of future CCLs. In this regard, the committee strongly urged EPA in its second report to consider the benefits of a more carefully considered and detailed description of the requirements of a CCL development process.

For this report, EPA asked the committee—which was partially reconstituted after the second report to include a new chair—to evaluate, expand, and revise as necessary the conceptual approach to the generation of future CCLs and any related conclusions and recommendations documented in the second report. In addition, EPA asked the committee

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