SAB to Review CCL5

SAB to Review CCL5

In the December 7, 2021 Federal Register (Fed Reg_SAB CCL5 Review_2021-12-07) EPA announced that the Science Advisory Board (SAB) will hold meetings to review the Contaminant Candidate List 5 (CCL5).  Meetings will be held on the following dates:

  1. January 11, 2022
  2. February 16, 2022
  3. February 18, 2022

All meetings will be held from 12:00 pm to 5:00 pm (EST).  According to the Federal Register notice, information on joining the webinar will be posted at the following site:


Within 18 months of enactment of the 1996 Safe Drinking Water Act Amendments, and then every five years thereafter, EPA is required to propose and finalize a CCL.  The draft fifth CCL was published by EPA in July 2021.

Constituents are included on the CCL that “…are not subject to any proposed or promulgated national primary drinking water regulation, which are known or anticipated to occur in public water systems, and which may require regulation….”  After publication of the CCL, EPA then goes through a review process (referred to as a Regulatory Determination) and makes an assessment as to whether a drinking water regulation should be promulgated for at least five of the constituents on the CCL.

“The Draft CCL5 includes 66 individual chemicals, 12 microbes, and three chemical groups – per- and polyfluoroalkyl substances (PFAS), cyanotoxins, and disinfection byproducts (DBPs)…..PFAS are proposed as a group, with the exception of PFOA and PFOS because the agency is moving forward with national primary drinking water standards for these two contaminants.”

At the present time, EPA expects to publish the final CCL5 during the summer of 2022.