EPA Science Advisory Board (SAB)

Drinking Water Contaminant Candidate List Draft Revisions

EPA Designated Federal Officer (DFO):Resha Putzrath

Responsible Committee/Panel:Drinking Water Committee

See EPA’s PDF page to learn more about PDF files.


EPA’s Office of Water has asked the SAB Drinking Water Committee to review EPA's draft Drinking Water Contaminant Candidate List 3 (CCL 3). The 1996 Safe Drinking Water Act Amendments (SDWA) require EPA to 1) publish every five years a list of currently unregulated contaminants in drinking water that may pose risks and 2) make determinations on whether or not to regulate at least five contaminants from that list on a staggered five year cycle. The list must be published after consultation with the scientific community, including the SAB, after notice and opportunity for public comment, and after consideration of the occurrence database established under section 1445(g) of the SDWA. The unregulated contaminants considered for the list must include, but are not limited to, substances referred to in section 101(14) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), and substances registered under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).

Developing the Contaminant Candidate List is part of the process of identifying water-borne threats to public health that need to be addressed by the Agency. EPA published and finalized the first CCL (CCL1) on March 2, 1998 (63 FR 10273). CCL1 contained 50 chemicals and 10 microbial contaminants/ groups and was developed using technical experts who reviewed readily available information. EPA consulted with the scientific community, including the SAB, on a process for developing the first CCL. EPA published and finalized the second CCL (CCL2) on February 24, 2005 (70 FR 9071). CCL2 carried forward the remaining 51 chemical and microbial contaminants/groups listed on CCL1.