Drinking Water Contaminant Candidate List (CCL) and Regulatory Determination

Drinking Water Contaminant Candidate List (CCL) and Regulatory Determination

About the Drinking Water CCL

The Contaminant Candidate List (CCL) is a list of drinking water contaminants that are known or anticipated to occur in public water systems and are not currently subject to EPA drinking water regulations.

Current and Previous CCLs

Read about the most recent and prior CCLs.

Regulatory Determination

The Safe Drinking Water Act requires EPA to periodically decide whether or not to regulate at least five contaminants on the contaminant candidate list. This action is called regulatory determination.