Contaminant Candidate List 4 - CCL 4
The Contaminant Candidate List (CCL) is a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations, but are known or anticipated to occur in public water systems. Contaminants listed on the CCL may require future regulation under the Safe Drinking Water Act (SDWA). EPA announced the Final CCL 4 on November 17, 2016. On February 22, 2021, the agency announced final regulatory determinations for contaminants on the CCL 4. Read the final regulatory determinations for contaminants on the CCL 4.
Federal Register Notices
Drinking Water Contaminant Candidate List 4
Read More About CCL 4
- Overview of the CCL 4 Approach
- CCL 4 Technical Support Documents
- CCL 4 Frequent Questions
- For additional information please visit docket number EPA-HQ-OW-2012-0217 at regulations.gov.
CCL 4 Contaminants
The CCL 4 includes 97 chemicals or chemical groups and 12 microbial contaminants. The list includes, among others, chemicals used in commerce, pesticides, biological toxins, disinfection byproducts, pharmaceuticals and waterborne pathogens. These lists can be read by selecting the links below.
