Contaminant Candidate List (CCL) and Regulatory Determination

Contaminant Candidate List 4 - CCL 4

What is the CCL?

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). 

CCL 4 Nominations Under Review

EPA requested nominations of chemical and microbial contaminants for possible inclusion in the fourth drinking water Contaminant Candidate List (CCL 4).  The nomination period ended on June 22, 2012. The agency is currently evaluating the nominations and expects to publish a draft CCL 4 in late 2014 or early 2015 that will include a 60-day public comment period. 

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