An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Contaminant Candidate List (CCL) and Regulatory Determination

Regulatory Determination 4

The Safe Drinking Water Act (SDWA) directs the EPA to publish a list of contaminants (referred to as the Contaminant Candidate List, or CCL) to assist in priority-setting efforts. The SDWA also directs the EPA to select no fewer than five contaminants from the current CCL and determine whether to regulate these contaminants with a National Primary Drinking Water Regulation (NPDWR). A regulatory determination is a decision on whether the EPA should initiate a rulemaking process to develop an NPDWR for a specific contaminant. Learn more.

Preliminary Regulatory Determinations for CCL 4

On February 20, 2020, the EPA announced and requested public comment on the preliminary regulatory determinations for eight contaminants on the fourth Contaminant Candidate List (CCL 4).

The EPA is making preliminary determinations to regulate perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in drinking water and to not regulate six contaminants (i.e., 1,1-dichloroethane, acetochlor, methyl bromide (bromomethane), metolachlor, nitrobenzene, and RDX).

The EPA is taking public comment on these preliminary determinations until May 11, 2020 (60 days after publication in the Federal Register). Instructions for submitting comments are included in the announcement in the Federal Register via Docket ID No. EPA-HQ-OW-2019-0583. 

Supporting Materials