may be to wait for the development and reporting of this information to support identification of industrial chemical drinking water contaminants warranting more detailed assessment.

In addition, emissions and release data contained in the toxic release inventory can be analyzed to identify chemicals presenting potential concerns owing to releases into drinking water sources.

This paper describes major components of EPA's program to assess, test, and manage the risk of new and existing industrial chemicals under TSCA. The paper also explores possible approaches to sorting and screening these chemicals to identify possible candidates that present drinking water concerns.

More information about TSCA and other EPA activities and programs can be found on EPA's Internet home page on the World Wide Web at http://www.epa.gov.

Auer, C. M. and D. H. Gould. 1987. Carcinogenicity assessment and the role of structure activity relationship (SAP,) analysis under TSCA Section 5. Environment Carcinogen Research C5(I):29-71.

Auer, C. M., J. V. Nabholz, and K. P. Baetcke. 1990. Mode of action and the assessment of chemical hazards in the presence of limited data: Use of structure-activity relationships (SAR) under TSCA Section 5. Environmental Health Perspectives 87:183-197.

Auer, C. M., M. Zeeman, J. V. Nabholz and R. G. Clements. 1994. SAR—The U.S. regulatory perspective. SAR & QSAR Environmental Research 2(1-2): 29-38.

EPA (U.S. Environmental Protection Agency). 1998a. Chemical Hazard Data Availability Study. Available on the Internet at http://www.epa.gov/opptintr/chemtest/hazchem.htm.

EPA. 1998b. Guidelines for Completing Initial Review Exposure Report for New Chemical Substances. Washington, D.C.: OPPT/EAB.

NRC (National Research Council). 1984. Toxicity Testing: Strategies to Determine Needs and Priorities. Washington, D.C.: National Academy Press.

OECD (Organization for Economic Cooperation and Development). 1994. EPA/EC Joint Project on the Evaluation of (Quantitative) Structure Activity Relationships. OECD Environment Monographs No. 88. Paris: OECD.

Zeeman, M., C. M. Auer, R. G. Clements, J. V. Nabholz, and R. S. Boethling. 1995. U.S. EPA regulatory perspectives on the use of QSAR for new and existing chemical evaluations. SAR and QSAR Environmental Research 3(3):179-201.

Front Matter (R1-R16)

Committee Report: A Conceptual Approach for the Development of Future Drinking Water Contaminant Candidate Lists (1-21)

1 Historical Overview of Drinking Water Contaminants and Public Water Utilities (22-32)

2 Emerging Drinking Water Contaminants: Overview and Role of the National Water-Quality Assessment Program (33-42)

3 CDC Perspective on Emerging Chemical Contaminants in Drinking Water (43-50)

4 Past and Future Strategies for Sorting and Ranking Chemicals: Applications to the 1998 Drinking Water COntaminant Candidate List Chemicals (51-102)

5 Sorting and Screening of Potential Drinking Water Contaminants: New and Existing Chemicals Under the Toxic Substances Control Act (103-111)

6 Emerging Chemical Drinking Water Contaminants (112-119)

7 New and Emerging Analytical Techniques for the Detection of Organic Contaminants in Water (120-135)

8 Emerging Pathogens: Names to Know and Bugs to Watch Out For (136-172)

9 Methods to Identify and Detect Microbial Contaminants in Drinking Water (173-205)

10 Biofilms in Drinking Water Distribution Systems: Significance and Control (206-219)

11 New and Emerging Drinking Water Treatment Technologies (220-243)

12 Emerging Drinking Water COntaminant Databases: A European Perspective (244-256)

Biographical Sketches of Committee Members and Staff (257-260)