An official website of the United States government.

Contaminant Candidate List (CCL) and Regulatory Determination

Regulatory Determination 3

The Safe Drinking Water Act (SDWA) directs EPA to publish a list of contaminants (referred to as the Contaminant Candidate List, or CCL) to assist in priority-setting efforts. SDWA also directs the Agency to select five or more contaminants from the current CCL and determine whether to regulate these contaminants with a National Primary Drinking Water Regulation (NPDWR).
To regulate a contaminant SDWA requires that EPA determine whether:
  1. The contaminant may have an adverse effect on the health of persons;
  2. The contaminant is known to occur or there is a substantial likelihood the contaminant will occur in public water systems with a frequency and at levels of public health concern; and
  3. In the sole judgment of the Administrator, regulation of the contaminant presents a meaningful opportunity for health risk reductions for persons served by public water systems.

Final Regulatory Determinations for CCL 3

On January 4, 2016, EPA announced the final determinations not to regulate four of the 116 CCL 3 contaminants – dimethoate, 1,3-dinitrobenzene, terbufos, and terbufos sulfone. The agency delayed the final regulatory determination on strontium to consider additional data and decide whether there is a meaningful opportunity for health risk reduction by regulating strontium in drinking water.

Preliminary Regulatory Determinations for CCL 3

EPA announced and requested public comment on the preliminary regulatory determinations for five CCL 3 contaminants. EPA made preliminary determinations to regulate strontium in drinking water and to not regulate four contaminants (i.e., dimethoate, 1,3-dinitrobenzene, terbufos, and terbufos sulfone).

Public Meetings Held On Preliminary Regulatory Determinations for the CCL3

EPA hosted a public stakeholder meeting on December 9, 2014, in Washington, DC, to discuss the Agency’s Regulatory Determination 3. For more information see the slides presented.