Contaminant Candidate List (CCL) and Regulatory Determination

Draft 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).

Request for Comments on Draft CCL 4

EPA requested comments on the chemical and microbial contaminants included in the Draft CCL 4 and on improvements to the CCL selection process to be considered for future CCLs. These comments were due by April 6, 2015.

Federal Register Notice

Drinking Water Contaminant Candidate List 4 - Draft

Read More About CCL 4

What's on the Draft CCL 4

The Draft CCL 4 includes 100 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.