Final List of Drinking Water Contaminants Announced for Potential Regulatory Consideration

The U.S. Environmental Protection Agency (USEPA) published the Final Fifth Drinking Water Contaminant Candidate List (CCL 5), which will serve as the basis for USEPA’s regulatory considerations over the next five-year cycle under the Safe Drinking Water Act (SDWA). This update includes a substantial expansion of per- and polyfluoroalkyl substances (PFAS).

In addition to a group of PFAS, the Final CCL 5 includes 66 individually listed chemicals, 12 microbes, and two additional chemical groups – cyanotoxins and disinfection byproducts. The 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 SDWA. 

USEPA posted a fact sheet that includes the entire list of 66 proposed contaminants on the CCL 5 and a notice on the Federal Register for public review under Docket No. EPA-HQ-OW-2018-0594.